after rebuild problems
Thread Starter
3rd Gear
Joined: Apr 2004
Posts: 3
Likes: 0
From: West Sacramento CA
after rebuild problems
I have just rebuilt my motor. New larger exhaust valves, heavier springs, mild cam upgrade, roller rockers. I'm still in the break in phase but have a back fire problem from the exhaust. Any ideas that I can check out?
thanks
thanks
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Re: after rebuild problems (goshawk)
I'll take a stab at it. Start with the following.
How many degrees of ignition timing? Have you run a compression test to rule out a leaking exhaust valve? What procedure did you use to adjust your rocker arms? I'm assuming your plug wires are on correctly according to firing order.
Exhaust backfires are only caused by one thing: Fuel burning in the manifold or pipes instead of the combustion chamber. Just a matter of finding out why. Any chance you have a leaking injector that is pouring fuel into a cylinder? Are any of the plugs fuel fouled?
Does the distributor cap have any cracks that could cause arcing?
Start there and post what you find out.
How many degrees of ignition timing? Have you run a compression test to rule out a leaking exhaust valve? What procedure did you use to adjust your rocker arms? I'm assuming your plug wires are on correctly according to firing order.
Exhaust backfires are only caused by one thing: Fuel burning in the manifold or pipes instead of the combustion chamber. Just a matter of finding out why. Any chance you have a leaking injector that is pouring fuel into a cylinder? Are any of the plugs fuel fouled?
Does the distributor cap have any cracks that could cause arcing?
Start there and post what you find out.
