[BRUTAL64]

Originally Posted by Vettezuki

We're going to have to hold a bake sale or something to get you a computer for the shop.

Wow, what a nice thought.

[big2bird]

More stuff

http://www.chevyhiperformance.com/te...ion_ratio.html

[big2bird]

http://www.pawinc.com/charts/Superch...mpression.html

[enkeivette]

Guess my jets outflowed my metering blocks. As you can see, there is almost no change.

Before (80s/94s)


After (75s/88s)

[94cobra69ss396]

Originally Posted by enkeivette

After (75s/88s)

Correct me if I'm wrong reading this graph because it's a little hard to read.

The bottom numbers are time lapsed and the side numbers from left to right are Volts, RPM and A/F ratio? According to the 2nd graph you ran your engine up to 8500rpms? The pull starts at 10 seconds where the ratio is 11.25. It then spikes to about 12.5, falls to almost 10, spikes again to about 13.75, falls to around 12.25 until about 13.5 seconds when you let off where it then spikes back up to about 15. Was this pull made under a load?

[enkeivette]

That 13.5 lean spike was because I pumped the throttle to readjust my foot. Wasn't WOT with either of those pulls, part throttle, prob 5lbs and about 4.5-5K rpm. I'm taking it easy because I'm making changes and I don't know what's going on till I get home. Don't want to pop another piston.

RPM is not accurate, only an indication that I was getting on it.

The spike at the end of the pull is normal, motor goes lean when the throttle slams closed all of a sudden. This is why your exhaust pops.

[big2bird]

Originally Posted by enkeivette

The spike at the end of the pull is normal, motor goes lean when the throttle slams closed all of a sudden. This is why your exhaust pops.

Actually, when you close the throttle, the mixture spikes rich. The popping sound is the mixture hitting the exhaust manifold. That is why diverter valves shut off during high vaccum readings.
Turn off your key at high rpms while coasting, then turn back on after a few seconds. It will ignite this unburned fuel, and blow your muffler clean off.

[BRUTAL64]

Originally Posted by big2bird

Turn off your key at high rpms while coasting, then turn back on after a few seconds. It will ignite this unburned fuel, and blow your muffler clean off.

Done that a few times.

[big2bird]

Originally Posted by big2bird

Pull it out, and I'll install a 10* stop.

Adam. Do you want me to do this the way we discussed, or would you like me to have a custom made 10* bushing made? It would take me more time to arrange that, and might be $20 instead of $10, but would be easier to reverse. Let me know.

[enkeivette]

Sent you a PM, yeah do the 10 bushing if you can. I can wait.

Update, I have a blue pump cam in the mail. Trying to see if I can fix the lean spit without going bigger on the jet size. Trying to keep my mpg above 7.