Thread: checkin

Tweet

how can you check to see if the all 8cyl are workin an to make sure the compression iswhere it needs to be before i get in to the 305...

Originally Posted by 305chevyboi

how can you check to see if the if all 8cyl are an to make sure the compression is right before i go into my rebuild of the 305...

yes ,I agree

Can any body help a young person out with this

It looks like you are asking how to determine how healthy your engine is before you start doing things to it? If that is correct, the first thing you should do is take a compression test of each cylinder and write it down. You are looking for balance between the cylinders. In other words, you don't want one to be 130 and the next one 60 lbs. About 10 percent variation is good, but you can go a little more and still be ok, but not much. Before you do this test, pull all the plugs out, disconnect the coil wire so the car won't want to start, and hold the choke open. Do one cylinder at a time, and let the engine spin several revolutions to peak the gauge.

There are other tests beyond this, like leakdown, and squirting some oil into the cylinders to determine if any low compression is valves or rings, but do the compression test first.

Some of the really good mechanics on here will have better ways to do this than I have outlined, I'm sure, but these are the basics.

Ok good engine guys, what should he do next??


Don

ok thanks alot cuz i dont want to have a dud but when the motor is runnin its sound fine no leaks or nothing.... Next ? how does a underdrive belt system help me out cuz for a 100 buck i can have it on my car

IMO underdrive pulleys (I assume for alternator, wp, ps, etc) are a waste unless you're planning serious racing and probably even under those circumstances. Theory is reduces load on motor by spinning accessories slower but can wreak havoc on the charging system and could lead to cooling problems. Another supposed benefit is it is harder to throw a belt... unless you're planning a race-only car with a battery charger in the pits, I wouldn't recommend but maybe other opinions?

2 cents,

Chris