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ChadS
11-14-2004 06:32:38
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Re: head grinding in reply to champspa, 11-13-2004 12:03:53
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Did you rejet the carb? you may need a bit more on the metering stem holes. Warmer air, usually takes less fuel, cooler air, takes more,,. At an idle,, does the carb flange get cold, or frost a bit? I think I would double check the venturi size,, make sure it is not the 6 cyl venturi. It hurts the HP at 540, and the lugging power with the big venturi in the 4 cyl engines. Any Super M or 400-450 venturi will be really close to what you need. Just hope it is still from the 450,,, Only reason I say this is because you never know what is in the carbs when you get them. 50 year old parts, anything can be in there,, LOL!! The next time you dyno that engine,, run it at 540 for about a minute solid,, then immediatly shut it down, pull out the plugs and check the color. If they are whiteish,, you need more fuel, black,, you need less. It is at 540,, at a lug,, is where the plug color needs to be looked at. That will tell you if you have the burn right in the cyl. The plug color needs to be a nice cocoa brown color. Now another point I need to bring up,,, Did you read the post I left about the Super M with the LP head on it,, that I tuned up 2 weeks ago? It was 75hp, with room for more power. His fuel gave up on it. He was running race gas, with pump gas mixed in,, and it was burning up inthe cyl too fast, and when I gave it more fuel, it just started smoking black,, real bad,, looked at the plugs,, and they were spotted, different colors onthe electrode, and could not get a good long burn in the cyl to get the cocoa brown I like to see on them. What fuel are you running? It needs to ba a slow burning, higher octane fuel. race fuels,, are a fast burning, high octane fuel,, you need a slow burning fuel in an antique puller, the reason is,, it is under 2500 rpm. That is why I like Ethanol so much,, I mix it with 94 pump gas, and the Ethanol gives me the preigntion, and detonation control it needs, and gives octane, and more power at the same time. I can fire a 300psi gas engine and not have any problems with detonation (etc) and make power with the fuel. It is a very very slow burning fuel, and has the octane to run the slow rpm engine perfectly. at any compression ratio. At least in the IH's. LOL. So, check your fuel, check your venturi size, and plug color at 540 on the dyno. I left my email unlocked,, email me,, I have more info on the dyno tuning info, what to look for and such,,, ChadS
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