What is wrong
#31
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Thread Starter
Your compression is too low , your cam is bleeding off what little cyl pressure you have . Iits not timing , carb size, tuning or anything else . You not only knocked 1.5 points of static compression but you also severely lowered your dynamic compression by a later closing intake valve .
#32
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iTrader: (3)
the facts billyboats stated are all contributing facts to the poor performance of these engines,also without degree checking of the cam,s position with the crank the specs on the cam are not factual.all those specs are based on the cam being properly phased with the crank.lets say your cam is 5 deg retarted from correct phasing,now you are bleeding off even more compression down low,it might make power at 6700 rpm but it can,t go past 5100 because it does not have the power to do so.mercury marine produces an engine that can run on 87 octane fuel,only has 8.75 c/r and uses a pos edelbrock head.with the same cam,10/1 cr and a good cylinder head 600 plus hp would be all day every day.
#33
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If I remember right the silver spring doesn't fully advance until 5 or 6k. However if you cked timing that wouldn't be an issue. Go to pertronix site and go to HEI distributors and find your model and download. This is just for your own info but should know what you have going on if you had a friend messing around with them since you used last. People have a tendency to change things just to see what happens but in reality don't have a clue. So regardless make sure you know what you have. Just a FYI.
#34
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If I remember right the silver spring doesn't fully advance until 5 or 6k. However if you cked timing that wouldn't be an issue. Go to pertronix site and go to HEI distributors and find your model and download. This is just for your own info but should know what you have going on if you had a friend messing around with them since you used last. People have a tendency to change things just to see what happens but in reality don't have a clue. So regardless make sure you know what you have. Just a FYI.
Last edited by mggdoors; 04-03-2017 at 10:09 PM.
#39
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Pertronix is sending two new ignitor 3 modules. They said it sounds to them like the modules are bad sense the leds on both do not respond to adjustment. We will see.