jonalman

i have a ford 302 that i have been building and i have a trickflow top end kit, with a ford E cam. when the motor is running, there is a constant popping sound under the hood, almost sounding like popcorn being made. the noise does kinda sound like metal on metal. i have checked my timing many times, and have checked my valves a number of times, and i am pretty sure that they are not the problem. the popping noise does escalate when rpms are increased. i really have no clue on what this noise could be, i am stuck. please help!

thanks.

mattdel

definately pinging.

whats the timing at?

jonalman

i am almost positive that timing isnt the issue, the noise started happening after a burnout. and it really doesnt sound like a "wrapping" noise like spun bearings make, i have plenty of oil pressure too.

86 5.0L

now this is a wild shot it the dark but maybe piston slap?[&:]

creekrat

How many miles on the motor? If it started happening after a burn out = high load, maybe the timing chain jumped and is causing your pininging. Have you noticed any other loss of performance?

jonalman

hmmm, the noises im hearing are pretty loud, but not backfiring.. is there any more information i can give you to make it easier on you

jonalman

the engine has very low mileage, and it does have a lack of performace to it. what do you mean by my timing chain jumped?

94StinkinLincoln

piston slap...that might be it, were ur pistons notched for valve clearance?

creekrat

Factory timing sets are not real high quality, after a while the chain can strech and cause wear on the gears. This throws the timing off between the crank and cam. They can wear to the point that they can jump a tooth under high loads and throw your timing way off

jonalman

yea, my pistons had notches in them. they are stock and forged