Thread: Popping sound

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the engine has about 5000 miles, all be it a few hard miles at the track.

the cam is a new comp cams xtreme energy 268. lift 477in/480exh with probably only 1000 miles, if that, on it and the springs to match and the heads were worked at accept a bigger lift.

i believe the popping is from the exhaust, i can feel it in my feet. but it is kinda hard to see the carb while driving. and when my dad was following my once (incase i broke down) he could hear it and it puffed out smoke everytime it popped.

i'll try the slow reving in park and see what happens.

Originally Posted by TUBJUB

the engine has about 5000 miles, all be it a few hard miles at the track.

the cam is a new comp cams xtreme energy 268. lift 477in/480exh with probably only 1000 miles, if that, on it and the springs to match and the heads were worked at accept a bigger lift.

i believe the popping is from the exhaust, i can feel it in my feet. but it is kinda hard to see the carb while driving. and when my dad was following my once (incase i broke down) he could hear it and it puffed out smoke everytime it popped.

i'll try the slow reving in park and see what happens.

yes thats a nice street and strip cam......
so ur saying the popping is from the exhause not the carb,,,,please try this in park,,,and let me no what happens,,also im thinking you may have some adjustment issues on the valves
(exhaust valves,,,,,)im wondering how did u adjust them ,,

my brother adjusted the valves, but i think he tightend the pushrods until there was a very small amount of resistance then went another quarter turn.

i raised the rpms to about 2000 and it started to shake very bad. it was popping and felt like it was missing.

it doesn't seem to pop when i let off the gas

the sparkplug wires are brand new MSD 8.8mm and are run clear of everything and have the heat protective boots on the plugs to keep them off the headers.

it could cross fire, but thats why we got the msd wires so it wouldn't.

when we had it dyno tuned (old carb) he said the timing curve was perfect. we haven't touched anything in the distributor since then.

yes the cam and springs match, we bought them at the sametime. I'm not opposed to readjusting the valves so we might check that

my mistake, they are 1/2 turn. The more i thought about it i remembered doing 2, 90 degree turns per valve

You might want to try going up jet size or two.

Yep Didn't read the second page.