High performance camshaft question

Kevin Lister · Post by **Kevin Lister** » Fri Jul 31, 2015 4:20 pm

I keep mine at 65MPH and lower. I see no need to wind the engine way up since as you say, " new crankshafts are no longer available". ;o)
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"Don B Laughton dontranspac@... [2cylinderhondas]"
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Friday, July 31, 2015 3:19 PM
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Re: [2cylinderhondas] Re: High performance camshaft question
45 horse was reached at 8,000rpm. Doing that for prolonged periods was beyond the reasonable limits for the basic design. Yes, you could do it running it up to fourth but crushing at 8,000 was a disaster waiting to happen. The 36 horse engine topped out at 7,000. With reasonable care, most, were good for 60,000mi. Still, cruising at 7,000 was not the smartest thing you could do. 600cc cars were city transportation, not freeway flyers.
Since new crankshafts are no longer available, a light foot is recommended. It is still a fun little car. Enjoy.
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On Jul 31, 2015, at 1:12 PM, Kevin Lister misterpoopoohead@...
[2cylinderhondas] < 2cylinderhondas@yahoogroups.com

wrote:
Yeah, it makes sense that the engine was originally designed to develop 45HP and the Continental US got a de-tuned engine.
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"Alan Stanyon
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Friday, July 31, 2015 9:32 AM
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RE: [2cylinderhondas] Re: High performance camshaft question
I see lot's of references to the "Hawaiian cam" i can only assume that the engine's destined for the States were detuned (correct me if i am wrong) in the UK we got the full fat version ie the 45hp engines these have 36mm carb's and Siamesed exhaust's without the heat exchanger if you would like to check cam/carb part numbers see here http://www.cmsnl.com/honda-z600-coupe-1 ... partslist/ this is a european site (Dutch actually) and the part numbers cover UK and European part numbers ie 45hp engines.
Hope this helps Alan
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Date: Fri, 31 Jul 2015 08:43:06 -0700
Subject: [2cylinderhondas] Re: High performance camshaft question
You need to check the specifications against a stock camshaft. Having built many high performance engines you'll only be opening a can of worms if you don't establish a baseline for reference.
If it turns out to be a Hawaiian cam then you can just bolt it in and run with it. You won't see much return for the effort, but at least it gives a conversation starter at the gas pump with your new found friends! Our carburetors by design are very forgiving with engine performance changes. You won't need to drill jets or anything else since more air drawn through already makes the mixture richer. With a Hawaiian cam you also won't be raising the revs enough to need different springs.
Bruce

Lyle Trudell · Post by **Lyle Trudell** » Fri Jul 31, 2015 6:19 pm

Agree, I love driving the Honda. It is slow, but if you beat on it a little you can keep up with traffic. I have had people at a stop light tell me that it's quick. They had no clue I was shifting at 6,500 slamming gears. Micro cars make the drive to work much more fun. : )

tdthies1 · Post by **tdthies1** » Fri Jul 31, 2015 7:34 pm

It goes fast. You just need to take the floor boards up and use your feet.. feet power!
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-------- Original message --------
From: "Lyle Trudell craft59@... [2cylinderhondas]"
Date:07/31/2015 6:19 PM (GMT-08:00)
To: 2cylinderhondas@yahoogroups.com
Subject: Re: [2cylinderhondas] Re: High performance camshaft question
Agree, I love driving the Honda. It is slow, but if you beat on it a little you can keep up with traffic. I have had people at a stop light tell me that it's quick. They had no clue I was shifting at 6,500 slamming gears. Micro cars make the drive to work much more fun. : )

Personel · Post by **Personel** » Fri Jul 31, 2015 8:35 pm

Ok.. Fred...
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On 31 Jul 2015, at 10:35 pm, tdthies1
tdthies1@...
[2cylinderhondas] wrote:
It goes fast. You just need to take the floor boards up and use your feet.. feet power!
Sent from Samsung tablet.

Bill · Post by **Bill** » Sat Aug 01, 2015 12:22 am

�
Lyle is correct; with out changing the size of your pistons, allowing for better breathing from the carb to the exhaust all your doing is complicating something Honda already figured out. To be more specific the carb needed for the longer duration cam is the N6D and N6D1 both of which were early engine carbs, which have larger venturi than the 6NM. The N6D and N6D1 were available with engines built through chassis number NXXX-XXX-XXXX. The 6NM is used for engines starting with chassis numbers NXXX-XXX-XXXX until April 1971.
The NXXX-XXX-XXXX for the USA market started late 1969 up to chassis number NXXX-XXX-XXXX.
The N600 engines numbered with N600E 1500001 (or for the Coupe N600E-2500001) all came with the later carb which was now available on the Coupe and Sedan.
Checking the table of setting marks for the early carb; page 14-8 of the Sedan shop manual a larger carb is needed to get the most out of the early cam. The valves and valve springs didn't change according to the parts manual and the size of the exhaust openings are the same as evidenced by the exhaust header gasket to the head exhaust port part number 18205-538-000 which didnt change with either the angle port or straight heads.
Bill

Bill · Post by **Bill** » Sat Aug 01, 2015 12:33 am

You have to remember one thing, you can’t just bolt in a new cam and expect the carb to keep things on track.