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ChadS
10-04-2005 11:51:48
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Re: nead help from some motor builders in reply to champspa, 10-02-2005 15:31:25
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Sounds to me like its running out of fuel. It will fall on its nose like you described if its lean. You can watch the dyno and it mite be very strong at first, then a few seconds later it will drop HP off at 540 and below? Your getting close to being about as good as it will get for compression for that cubic inch to make as much power as you are going to get or expect. 75 hp out of that engine is pretty good,, I could belive 80 on a good day,,, You have changed the engine so much in that 15psi of compression boost, that your former settings are no longer good for that old set up. 15psi is quite a compression increase in one of these engines, that could be another 5hp if you feed the fuel. Another point, is that when the compression is 200+psi, you will need to start looking for a bigger intake and venturi, the air speed in your engine is so high, and the vacuum pressure is so high, that its starving for air and fuel, more air than fuel,, but, you may have a set up that is large enough to feed, and just need to adjust the load screw, and bump the timing a bit to get the most out of your changes. The big intake helps, and the #35 venturi compliments,,, but if your plugs are white or lite brown,, you can back the main load adjustment screw out, all the way, and still not make it smoke, I say under a load this time,,, you need to go bigger on the jet, and the metering stem. if you can get the fuel, make it run rich,, and see no HP improvemnets, you need more air. Work on dropping the vacuum pressure in the manifold, bigger venturi,, or a larger intake,,, I recomend the Vinson replacement, they are bigger casted and better port design, and costs about the same as a new one,,,LP manifold if you can find a good one cheap, or what ever you wanna spend on. More fuel, more air, need to have a dark brown spark plug color under a load. Just my 2 cents. How thick is the gasket?
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