Header design and exhaust

[lyletrudell]

I want to eliminate my heat exchanger, since I live in Florida.
Less under hood heat and less back pressure would be a plus.
The stock exhaust header pipes are poorly matched (1/8" off)to the exhaust ports.
All the flanges, multiple gaskets, heat exchanger and all the twists/turns can't be good for exhaust flow or mileage/performance.
I want the primary tubes to go the same way as the stock system, that way all the mounting brackets could be used.
Was looking at my header notes and came up with this for a stock engine header.
* 1-1/4" primary tubes.
* 28" long, equal length.
* 2 into 1 collector with an outlet of 1-3/8 ID.
* Then 1-3/8 OD exhaust to a free flow muffler and resonator?
Then I will rejet the carb.
My 72 coupe is stock.
Thoughts?
Lyle

[CHEYENNE FLETCHER]

Make one for the sedan too I'll buy it

> ----- Original Message -----
> From:
> lyletrudell
> To:
> 2cylinderhondas@yahoogroups.com
> Sent:
> Tuesday, August 31, 2010 11:46
> AM
> Subject:
> [2cylinderhondas] Header design
> and exhaust
> I want to eliminate my heat exchanger, since I live in Florida.
> Less
> under hood heat and less back pressure would be a plus.
> The stock exhaust
> header pipes are poorly matched (1/8" off)to the exhaust ports.
> All the
> flanges, multiple gaskets, heat exchanger and all the twists/turns can't be > good for exhaust flow or mileage/performance.
> I want the primary tubes to
> go the same way as the stock system, that way all the mounting brackets could > be used.
> Was looking at my header notes and came up with this for a > stock engine header.
> * 1-1/4" primary tubes.
> * 28" long, equal
> length.
> * 2 into 1 collector with an outlet of 1-3/8 ID.
> * Then 1-3/8 OD
> exhaust to a free flow muffler and resonator?
> Then I will rejet the
> carb.
> My 72 coupe is stock.
> Thoughts?
> Lyle

[lyletrudell]

Had lunch with my racer bike buddy and we changed a few things.
Updated info, for a stock engine header.
RPM range 3,000 to 6,500.
* One piece 5/16" thick header flange, better port alignment.
* Copper header rings, not tube type.
* 1-1/4" primary tubes.
* 30-32" long, equal length, stock brackets used.
* 2 into 1 collector with an outlet of 1-3/8 ID.
* 1-3/8 OD exhaust pipe to a front free flow muffler.
* 1-1/2" pipe over rear axle to a rice rocket resonator.
Then I will rejet the carb.
My 72 coupe is stock.
Thoughts?
Lyle

--- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> I want to eliminate my heat exchanger, since I live in Florida.
> Less under hood heat and less back pressure would be a plus.
> The stock exhaust header pipes are poorly matched (1/8" off)to the exhaust ports.
> All the flanges, multiple gaskets, heat exchanger and all the twists/turns can't be good for exhaust flow or mileage/performance.
> I want the primary tubes to go the same way as the stock system, that way all the mounting brackets could be used.
> Was looking at my header notes and came up with this for a stock engine header.
> * 1-1/4" primary tubes.
> * 28" long, equal length.
> * 2 into 1 collector with an outlet of 1-3/8 ID.
> * Then 1-3/8 OD exhaust to a free flow muffler and resonator?
> Then I will rejet the carb.
> My 72 coupe is stock.
> Thoughts?
> Lyle

[lyletrudell]

The problem with designing a header is the RPM you want to get the best power.
I was calculating about 4,000 to 5,000?
So the numbers will change depending on RPM.
On my 2006 750 Gixxer it has a computer controlled butterfly valve that blocks the exhaust at low rpm's and opens at higher rpm's. So it makes power at all RPM's!!!
We have to find a happy medium, just like the Honda engineers did.
But I don't have to worry about a heater.
Latest numbers:
* One piece 5/16" thick header flange, better port alignment.
* Copper header rings, not tube type.
* 1-1/4" primary tubes.
* 32-34" long, equal length, stock brackets used.
* 2 into 1 collector with an outlet of 1-1/2 ID.
* 1-1/2 OD exhaust pipe to a front free flow muffler.
* 1-3/4" OD pipe over rear axle to a rice rocket resonator.
Then I will rejet the carb.
My 72 coupe is stock.
Thoughts?
Lyle

--- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> Had lunch with my racer bike buddy and we changed a few things.
> Updated info, for a stock engine header.
> RPM range 3,000 to 6,500.
> * One piece 5/16" thick header flange, better port alignment.
> * Copper header rings, not tube type.
> * 1-1/4" primary tubes.
> * 30-32" long, equal length, stock brackets used.
> * 2 into 1 collector with an outlet of 1-3/8 ID.
> * 1-3/8 OD exhaust pipe to a front free flow muffler.
> * 1-1/2" pipe over rear axle to a rice rocket resonator.
> Then I will rejet the carb.
> My 72 coupe is stock.
> Thoughts?
> Lyle
> --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > I want to eliminate my heat exchanger, since I live in Florida.
> > Less under hood heat and less back pressure would be a plus.
> > The stock exhaust header pipes are poorly matched (1/8" off)to the exhaust ports.
> > All the flanges, multiple gaskets, heat exchanger and all the twists/turns can't be good for exhaust flow or mileage/performance.
> > I want the primary tubes to go the same way as the stock system, that way all the mounting brackets could be used.
> > Was looking at my header notes and came up with this for a stock engine header.
> > * 1-1/4" primary tubes.
> > * 28" long, equal length.
> > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > * Then 1-3/8 OD exhaust to a free flow muffler and resonator?
> > Then I will rejet the carb.
> > My 72 coupe is stock.
> > Thoughts?
> > Lyle

[lyletrudell]

Designing a header is not easy, so tomorrow I will get together with some of the best local motor heads and bikers in the Tampa Bay area.
http://www.pinellaslube.com/bikenight.htm
Will see what they say about our Honda 600 twin.
A little beer and good looking women is always a good way to solve problems!
So, when I get my Honda coupe finished can I take it to bike night?
Honda motorcycle engine.....I say yes!
Lyle

--- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> The problem with designing a header is the RPM you want to get the best power.
> I was calculating about 4,000 to 5,000?
> So the numbers will change depending on RPM.
> On my 2006 750 Gixxer it has a computer controlled butterfly valve that blocks the exhaust at low rpm's and opens at higher rpm's. So it makes power at all RPM's!!!
> We have to find a happy medium, just like the Honda engineers did.
> But I don't have to worry about a heater.
> Latest numbers:
> * One piece 5/16" thick header flange, better port alignment.
> * Copper header rings, not tube type.
> * 1-1/4" primary tubes.
> * 32-34" long, equal length, stock brackets used.
> * 2 into 1 collector with an outlet of 1-1/2 ID.
> * 1-1/2 OD exhaust pipe to a front free flow muffler.
> * 1-3/4" OD pipe over rear axle to a rice rocket resonator.
> Then I will rejet the carb.
> My 72 coupe is stock.
> Thoughts?
> Lyle
> --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > Had lunch with my racer bike buddy and we changed a few things.
> > Updated info, for a stock engine header.
> > RPM range 3,000 to 6,500.
> > * One piece 5/16" thick header flange, better port alignment.
> > * Copper header rings, not tube type.
> > * 1-1/4" primary tubes.
> > * 30-32" long, equal length, stock brackets used.
> > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > * 1-3/8 OD exhaust pipe to a front free flow muffler.
> > * 1-1/2" pipe over rear axle to a rice rocket resonator.
> > Then I will rejet the carb.
> > My 72 coupe is stock.
> > Thoughts?
> > Lyle
> > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > I want to eliminate my heat exchanger, since I live in Florida.
> > > Less under hood heat and less back pressure would be a plus.
> > > The stock exhaust header pipes are poorly matched (1/8" off)to the exhaust ports.
> > > All the flanges, multiple gaskets, heat exchanger and all the twists/turns can't be good for exhaust flow or mileage/performance.
> > > I want the primary tubes to go the same way as the stock system, that way all the mounting brackets could be used.
> > > Was looking at my header notes and came up with this for a stock engine header.
> > > * 1-1/4" primary tubes.
> > > * 28" long, equal length.
> > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > * Then 1-3/8 OD exhaust to a free flow muffler and resonator?
> > > Then I will rejet the carb.
> > > My 72 coupe is stock.
> > > Thoughts?
> > > Lyle

[feltonminicycle]

Honda 600's thrive on back pressure. It will be like when I pulled the windings off my flywheel and mounted an external alternator. The thing would not work right, would not hill climb. Revved nice standing still.
The Hawaiian & Euro cars did not have the heat exchanger, you should get a set of those pipes. Same problems you will run into with porting the head.
Miles

--- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> Designing a header is not easy, so tomorrow I will get together with some of the best local motor heads and bikers in the Tampa Bay area.
http://www.pinellaslube.com/bikenight.htm
> Will see what they say about our Honda 600 twin.
> A little beer and good looking women is always a good way to solve problems!
> So, when I get my Honda coupe finished can I take it to bike night?
> Honda motorcycle engine.....I say yes!
> Lyle
> --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > The problem with designing a header is the RPM you want to get the best power.
> > I was calculating about 4,000 to 5,000?
> > So the numbers will change depending on RPM.
> > On my 2006 750 Gixxer it has a computer controlled butterfly valve that blocks the exhaust at low rpm's and opens at higher rpm's. So it makes power at all RPM's!!!
> > We have to find a happy medium, just like the Honda engineers did.
> > But I don't have to worry about a heater.
> > Latest numbers:
> > * One piece 5/16" thick header flange, better port alignment.
> > * Copper header rings, not tube type.
> > * 1-1/4" primary tubes.
> > * 32-34" long, equal length, stock brackets used.
> > * 2 into 1 collector with an outlet of 1-1/2 ID.
> > * 1-1/2 OD exhaust pipe to a front free flow muffler.
> > * 1-3/4" OD pipe over rear axle to a rice rocket resonator.
> > Then I will rejet the carb.
> > My 72 coupe is stock.
> > Thoughts?
> > Lyle
> > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > Had lunch with my racer bike buddy and we changed a few things.
> > > Updated info, for a stock engine header.
> > > RPM range 3,000 to 6,500.
> > > * One piece 5/16" thick header flange, better port alignment.
> > > * Copper header rings, not tube type.
> > > * 1-1/4" primary tubes.
> > > * 30-32" long, equal length, stock brackets used.
> > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > * 1-3/8 OD exhaust pipe to a front free flow muffler.
> > > * 1-1/2" pipe over rear axle to a rice rocket resonator.
> > > Then I will rejet the carb.
> > > My 72 coupe is stock.
> > > Thoughts?
> > > Lyle
> > > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > > I want to eliminate my heat exchanger, since I live in Florida.
> > > > Less under hood heat and less back pressure would be a plus.
> > > > The stock exhaust header pipes are poorly matched (1/8" off)to the exhaust ports.
> > > > All the flanges, multiple gaskets, heat exchanger and all the twists/turns can't be good for exhaust flow or mileage/performance.
> > > > I want the primary tubes to go the same way as the stock system, that way all the mounting brackets could be used.
> > > > Was looking at my header notes and came up with this for a stock engine header.
> > > > * 1-1/4" primary tubes.
> > > > * 28" long, equal length.
> > > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > > * Then 1-3/8 OD exhaust to a free flow muffler and resonator?
> > > > Then I will rejet the carb.
> > > > My 72 coupe is stock.
> > > > Thoughts?
> > > > Lyle

[lyletrudell]

Miles, I would like to see that pipe setup.
Anybody got pictures or a used set? Condition not important.
The stock exhaust ports are about 1.300" inside diameter.
The stock header pipe flange is 1.125" inside diameter.
Plus they are mismatched a lot.
So the exhaust hits a wall and causes turbulence, not good for flow.
We don't want to get back pressure from mis-alignment.
If we had 150HP this would not be an issue, but with 36HP, poor alignment adds up.
On my Go-Kart we have about 19HP at 14,000 rpm and we can go 110mph at Daytona, because everything is aligned perfect.
Yes, 4 stroke engines need back pressure.
It needs to be tuned just like the carb.
The RPM range I will be tuning for a stock Honda 600 will be 3,500-6,000, the crank can't take high RPM's!
The rice rocket kids pull the stock exhaust and stick on a huge pipe and no muffler. Sounds cool, but it destroyed the useful power.
I want this header to be better than stock.
So my goal is 40HP from my stock engine, 10% gain.
With a tuned exhaust and a re-jetted carb, it should be easy to get.
Lyle

--- In
2cylinderhondas@yahoogroups.com
, "feltonminicycle" wrote:
> The Hawaiian & Euro cars did not have the heat exchanger, you should get a set of those pipes.
Miles
> --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > Designing a header is not easy, so tomorrow I will get together with some of the best local motor heads and bikers in the Tampa Bay area.
http://www.pinellaslube.com/bikenight.htm
> > Will see what they say about our Honda 600 twin.
> > A little beer and good looking women is always a good way to solve problems!
> > So, when I get my Honda coupe finished can I take it to bike night?
> > Honda motorcycle engine.....I say yes!
> > Lyle
> > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > The problem with designing a header is the RPM you want to get the best power.
> > > I was calculating about 4,000 to 5,000?
> > > So the numbers will change depending on RPM.
> > > On my 2006 750 Gixxer it has a computer controlled butterfly valve that blocks the exhaust at low rpm's and opens at higher rpm's. So it makes power at all RPM's!!!
> > > We have to find a happy medium, just like the Honda engineers did.
> > > But I don't have to worry about a heater.
> > > Latest numbers:
> > > * One piece 5/16" thick header flange, better port alignment.
> > > * Copper header rings, not tube type.
> > > * 1-1/4" primary tubes.
> > > * 32-34" long, equal length, stock brackets used.
> > > * 2 into 1 collector with an outlet of 1-1/2 ID.
> > > * 1-1/2 OD exhaust pipe to a front free flow muffler.
> > > * 1-3/4" OD pipe over rear axle to a rice rocket resonator.
> > > Then I will rejet the carb.
> > > My 72 coupe is stock.
> > > Thoughts?
> > > Lyle
> > > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > > Had lunch with my racer bike buddy and we changed a few things.
> > > > Updated info, for a stock engine header.
> > > > RPM range 3,000 to 6,500.
> > > > * One piece 5/16" thick header flange, better port alignment.
> > > > * Copper header rings, not tube type.
> > > > * 1-1/4" primary tubes.
> > > > * 30-32" long, equal length, stock brackets used.
> > > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > > * 1-3/8 OD exhaust pipe to a front free flow muffler.
> > > > * 1-1/2" pipe over rear axle to a rice rocket resonator.
> > > > Then I will rejet the carb.
> > > > My 72 coupe is stock.
> > > > Thoughts?
> > > > Lyle
> > > > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > > > I want to eliminate my heat exchanger, since I live in Florida.
> > > > > Less under hood heat and less back pressure would be a plus.
> > > > > The stock exhaust header pipes are poorly matched (1/8" off)to the exhaust ports.
> > > > > All the flanges, multiple gaskets, heat exchanger and all the twists/turns can't be good for exhaust flow or mileage/performance.
> > > > > I want the primary tubes to go the same way as the stock system, that way all the mounting brackets could be used.
> > > > > Was looking at my header notes and came up with this for a stock engine header.
> > > > > * 1-1/4" primary tubes.
> > > > > * 28" long, equal length.
> > > > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > > > * Then 1-3/8 OD exhaust to a free flow muffler and resonator?
> > > > > Then I will rejet the carb.
> > > > > My 72 coupe is stock.
> > > > > Thoughts?
> > > > > Lyle

[lyletrudell]

Just got back from the bike show. The cooler weather and no rain brought out a good crowd.
Lot's of cool bikes and good looking women in leather.
Sorry no pictures!
Gave a couple friends some info on the Honda 600 and they smiled and said they might be able to help get a couple extra HP.
Power to weight ratio was a big concern, they all agreed we need low end torque, 36hp moving 1300+ lbs is not good.
They both have computer race software for bike tuning, so they should be able to give us some useful numbers.
Hey it only cost a couple beers!
Lyle

--- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> Designing a header is not easy, so tomorrow I will get together with some of the best local motor heads and bikers in the Tampa Bay area.
http://www.pinellaslube.com/bikenight.htm
> Will see what they say about our Honda 600 twin.
> A little beer and good looking women is always a good way to solve problems!
> So, when I get my Honda coupe finished can I take it to bike night?
> Honda motorcycle engine.....I say yes!
> Lyle
> --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > The problem with designing a header is the RPM you want to get the best power.
> > I was calculating about 4,000 to 5,000?
> > So the numbers will change depending on RPM.
> > On my 2006 750 Gixxer it has a computer controlled butterfly valve that blocks the exhaust at low rpm's and opens at higher rpm's. So it makes power at all RPM's!!!
> > We have to find a happy medium, just like the Honda engineers did.
> > But I don't have to worry about a heater.
> > Latest numbers:
> > * One piece 5/16" thick header flange, better port alignment.
> > * Copper header rings, not tube type.
> > * 1-1/4" primary tubes.
> > * 32-34" long, equal length, stock brackets used.
> > * 2 into 1 collector with an outlet of 1-1/2 ID.
> > * 1-1/2 OD exhaust pipe to a front free flow muffler.
> > * 1-3/4" OD pipe over rear axle to a rice rocket resonator.
> > Then I will rejet the carb.
> > My 72 coupe is stock.
> > Thoughts?
> > Lyle
> > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > Had lunch with my racer bike buddy and we changed a few things.
> > > Updated info, for a stock engine header.
> > > RPM range 3,000 to 6,500.
> > > * One piece 5/16" thick header flange, better port alignment.
> > > * Copper header rings, not tube type.
> > > * 1-1/4" primary tubes.
> > > * 30-32" long, equal length, stock brackets used.
> > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > * 1-3/8 OD exhaust pipe to a front free flow muffler.
> > > * 1-1/2" pipe over rear axle to a rice rocket resonator.
> > > Then I will rejet the carb.
> > > My 72 coupe is stock.
> > > Thoughts?
> > > Lyle
> > > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > > I want to eliminate my heat exchanger, since I live in Florida.
> > > > Less under hood heat and less back pressure would be a plus.
> > > > The stock exhaust header pipes are poorly matched (1/8" off)to the exhaust ports.
> > > > All the flanges, multiple gaskets, heat exchanger and all the twists/turns can't be good for exhaust flow or mileage/performance.
> > > > I want the primary tubes to go the same way as the stock system, that way all the mounting brackets could be used.
> > > > Was looking at my header notes and came up with this for a stock engine header.
> > > > * 1-1/4" primary tubes.
> > > > * 28" long, equal length.
> > > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > > * Then 1-3/8 OD exhaust to a free flow muffler and resonator?
> > > > Then I will rejet the carb.
> > > > My 72 coupe is stock.
> > > > Thoughts?
> > > > Lyle

[Dave Rulez]

For waht is worth guys, the heat exchanger is nothing but a couple thru pipes if you strip away all the outside, you could easily make a one piece header modeled after the existing set up, same basic dimensions and route wihtout the multiple joints and gaskets. Also have any of you seen this guys header?
http://www.japanesenostalgiccar.com/for ... c&start=60

--- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> Just got back from the bike show. The cooler weather and no rain brought out a good crowd.
> Lot's of cool bikes and good looking women in leather.
> Sorry no pictures!
> Gave a couple friends some info on the Honda 600 and they smiled and said they might be able to help get a couple extra HP.
> Power to weight ratio was a big concern, they all agreed we need low end torque, 36hp moving 1300+ lbs is not good.
> They both have computer race software for bike tuning, so they should be able to give us some useful numbers.
> Hey it only cost a couple beers!
> Lyle
> --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > Designing a header is not easy, so tomorrow I will get together with some of the best local motor heads and bikers in the Tampa Bay area.
http://www.pinellaslube.com/bikenight.htm
> > Will see what they say about our Honda 600 twin.
> > A little beer and good looking women is always a good way to solve problems!
> > So, when I get my Honda coupe finished can I take it to bike night?
> > Honda motorcycle engine.....I say yes!
> > Lyle
> > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > The problem with designing a header is the RPM you want to get the best power.
> > > I was calculating about 4,000 to 5,000?
> > > So the numbers will change depending on RPM.
> > > On my 2006 750 Gixxer it has a computer controlled butterfly valve that blocks the exhaust at low rpm's and opens at higher rpm's. So it makes power at all RPM's!!!
> > > We have to find a happy medium, just like the Honda engineers did.
> > > But I don't have to worry about a heater.
> > > Latest numbers:
> > > * One piece 5/16" thick header flange, better port alignment.
> > > * Copper header rings, not tube type.
> > > * 1-1/4" primary tubes.
> > > * 32-34" long, equal length, stock brackets used.
> > > * 2 into 1 collector with an outlet of 1-1/2 ID.
> > > * 1-1/2 OD exhaust pipe to a front free flow muffler.
> > > * 1-3/4" OD pipe over rear axle to a rice rocket resonator.
> > > Then I will rejet the carb.
> > > My 72 coupe is stock.
> > > Thoughts?
> > > Lyle
> > > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > > Had lunch with my racer bike buddy and we changed a few things.
> > > > Updated info, for a stock engine header.
> > > > RPM range 3,000 to 6,500.
> > > > * One piece 5/16" thick header flange, better port alignment.
> > > > * Copper header rings, not tube type.
> > > > * 1-1/4" primary tubes.
> > > > * 30-32" long, equal length, stock brackets used.
> > > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > > * 1-3/8 OD exhaust pipe to a front free flow muffler.
> > > > * 1-1/2" pipe over rear axle to a rice rocket resonator.
> > > > Then I will rejet the carb.
> > > > My 72 coupe is stock.
> > > > Thoughts?
> > > > Lyle
> > > > --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > > > > I want to eliminate my heat exchanger, since I live in Florida.
> > > > > Less under hood heat and less back pressure would be a plus.
> > > > > The stock exhaust header pipes are poorly matched (1/8" off)to the exhaust ports.
> > > > > All the flanges, multiple gaskets, heat exchanger and all the twists/turns can't be good for exhaust flow or mileage/performance.
> > > > > I want the primary tubes to go the same way as the stock system, that way all the mounting brackets could be used.
> > > > > Was looking at my header notes and came up with this for a stock engine header.
> > > > > * 1-1/4" primary tubes.
> > > > > * 28" long, equal length.
> > > > > * 2 into 1 collector with an outlet of 1-3/8 ID.
> > > > > * Then 1-3/8 OD exhaust to a free flow muffler and resonator?
> > > > > Then I will rejet the carb.
> > > > > My 72 coupe is stock.
> > > > > Thoughts?
> > > > > Lyle

[Jerry]

I saw those headers a few days ago, hilarious! Guess loud pipes save lives can also apply to microcars. I do like his car. Almost bought the same tires as him but figured I should use my brand new kumhos instead
From: Dave Rulez
Sent: Thursday, September 02, 2010 6:22 AM
To: 2cylinderhondas@yahoogroups.com
Subject: [2cylinderhondas] Re: Header design and exhaust
For waht is worth guys, the heat exchanger is nothing but a couple thru pipes if you strip away all the outside, you could easily make a one piece header modeled after the existing set up, same basic dimensions and route wihtout the multiple joints and gaskets. Also have any of you seen this guys header?
http://www.japanesenostalgiccar.com/for ... c&start=60

--- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> Just got back from the bike show. The cooler weather and no rain brought out a good crowd.
> Lot's of cool bikes and good looking women in leather.
> Sorry no pictures!
> Gave a couple friends some info on the Honda 600 and they smiled and said they might be able to help get a couple extra HP.
> Power to weight ratio was a big concern, they all agreed we need low end torque, 36hp moving 1300+ lbs is not good.
> They both have computer race software for bike tuning, so they should be able to give us some useful numbers.
> Hey it only cost a couple beers!
> Lyle
> --- In
2cylinderhondas@yahoogroups.com
, "lyletrudell" wrote:
> > Designing a header is not easy, so tomorrow I will get

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