engine and drivetrain tune up questions

[Guest Anonymous]

Hey I'm 17 and just put a new engine in my 2002 and have some timing and tune up questions. I built the engine with 9.5:1 pistons, ireland 292 cam, header and a mechanical advance distributor. As for carburetion all i have is the 32/36 i took off my old engine. I was just wondering what things i can do to get it running a little better. It misses quite a bit, but the timing is apparently right on. Any tips for timing anyone could throw out there? could the missing be a carburetor problem? schools starting in like a day so im tryin to get this thing finished up. thanks!

mike

[Guest Anonymous]

How new are your points/rotor/cap and wires?

What RPM did you use to set the timing?

At what engine speeds / wheel speed / load conditions does it miss? (remember you're sucking more gas now)

The 32/36 is not ideal for your engine, but there is no reason you shouldn't be able to make it run smoothly.

Cheers!

John N

[Guest Anonymous]

1. determine if miss is ign or carburetion. Didja install new plug wires? Have you pulled one wire at a time while the engine is running to see if the miss goes away? Are the plug connectors either new or in good shape?

2. Didja check for vacuum leaks? Didja rebuild the carb, or at least clean it out real good? With the higher compression and hotter cam, you will probably need to rejet the carb as it was set up for a stock engine. Someone on the board should be able to tell you what jets to use. You might want to consider a 38/38 Weber upgrade to take advantage of the cam and C/R.

Good luck, and way to go for rebuilding the engine yourself. That's the way to learn!

Cheers

Mike

[Guest Anonymous]

brand new cap, rotor, and points. The wires are like 6 mos old. Its just all the time it has the little "pft" noise in the idle when it misses. Its not TERRIBLE but its noticable. I would much rather it not be there. It seems like it doesnt miss at a higher constant RPM. Yes the carb is jetted for the stock engine so i need to change that. I have sidedraft manifolds but no sidedrafts or linkage. so thats my next wish. thanks!

mike

[Guest Anonymous]

Something kind of funny, when i was putting the points in the distributor, i noticed that the shaft was bent. I used a dial caliper and it was 70 thou out of round, so i pounded it back as close i could. i got it to about 2 thou from perfect. do you think this could be my problem? it seems like a measured another distributor i had and it was about the same. i dont know if there is a tolerance or antyhing for that. just a thought. thanks man, ive worked super hard on this thing and theres nothin else like firing an engine youve spent tons of time on. Now to make it run right!

mike

[Guest Anonymous]

Is it a dead miss or intermittent??? is the noise you hear a steady hissing noise???

[Guest Anonymous]

the miss is just kinda mixed in with the lope. and i tryed adjusting the mixture screw on the weber to no avail. wouldnt a steady hissing noise be the header?

mike

[Guest Anonymous]

Two thou shouldn't make tht much difference in the dizzy--especially if you measured it against another one. Didja try swapping distributors with another one? Also,if you installed new points, the rubbing block will wear quite a bit in the first thousand miles or so (especially if you didn't grease the dizzy's cam lobes) and may have closed up a bit. So check your point gap.

The hissing you mention does sound like a vacuum leak, tho...

Try disconnecting the vacuum advance hose at the carb end (engine off) and sucking on it with the dizzy cap off--you should (1) feel resistance and (2) see the point plate move. No resistance=vacuum leak and no vacuum advance; resistance and no point plate movement=no vacuum advance. Either can cause the miss. If you have a straight mechanical advance dizzy (an 002) ignore this paragraph.

Keep looking; it's gotta be something and you'll find it if you're patient and logical.

Cheers

Mike

[Guest Anonymous]

I know it sounds to simple, but did you seal the vacuum nipple that goes from the carb to the diaphram on the distributor? I know you have mech advance, but still need to close of suction on carb in order to tune and get mixture correct.