Cisco NA F22 non-VTEC SOHC Project - Full Street White

[HondaFan81]

Thanks Justin. I too have long hoped for more knowledgeable people living near me because we'd have some crazy project fun!! My wife would hate me though.

[cloudasc]

Sorry to hear that you were still unable to work the kinks out. Glad to see you've made progress, and you saw better numbers this time on the dyno, your getting closer. This project will really be a beast when your done. Keep up the good work, and good luck!

[HondaFan81]

After speaking with others, I have decided to do another leakdown test. If I get good numbers, then the motor is healthy regardless of compression test numbers. If I do not, I will narrow down where the leakage occurs. Also, I will do another compression test for reference and go from there. I had good leakdown numbers about 100 miles ago, I hope there was no degradation.

[HondaFan81]

what does the ignition map look like now?

I have not compared calibrations on both tuners yet, so I can not comment. The first tuner did TPS/Alpha N based and the 2nd tuner did MAP based, so that is a difference. Anyhow, I had to leave for family vacation, have had no time.

[HondaFan81]

Got back from vacation yesterday, only been able to do a bit. Anyhow, my piston ring theory of not sealing does not seem to be the issue and motor appears healthy. Did another compression test, it is consistent across all cylinders. The low vacuum and lower compression test numbers are due to the camshaft. However, I am still battling finding a tuner that knows how to deal with an aggressive NA camshaft. It seems a hybrid of alpha-N based idle/low RPM and MAP sensor based for rest of calibrations is the solution. I want this setup driveable so I can enjoy it a bit.

[foamypirate]

Low vacuum, yes...low compression test #'s...NO.

How much have you beat on it?

Depending on the amount of overlap, yes, the camshaft can cause lower compression numbers.

[d112crzy]

Not as low as his are. He has 9:1 compression....I'd expect the numbers to at least be in the 200's.

Someone else with the same cam as his has compression numbers that are 50+psi higher and the guy has less static compression.


You figure it out.

[HondaFan81]

The other guy does not have the same camshaft, found out today. Thus, their higher compression test numbers. Hence my correction in this thread. It is the camshaft, which explains why I retain good leakdown numbers. I was misinformed that the other guy had the same camshaft, that threw me for a loop. Foamypirate is on point.

[HondaFan81]

The leakdown percentage per cylinder is what is key, not the variation between cylinders (if that is what you're referring to). I do agree that the rings are still sealing, but most of the sealing is done and I have good leakdown numbers. My point here is the leakdown are past the rings (which is normal), but the compression test numbers are on the lower end due to the camshaft design. I may see an increase in compression test numbers, but they should not be anything significant. I still keep your story in mind and more power to me if I see an increase as you described, but I'm doubting it. I'll keep you posted.

[cloudasc]

If its in actually the cam that is causing the low compression numbers due to the overlap, couldn't you adjust your cam gear so the valves are as close to closed at tdc, and run your compression check then?

[HondaFan81]

Yes, I can play around with advancing/retarding the camshaft, but I did degree it and so it should be at its optimal. I was planning on moving the camshaft and doing compression tests to see if I can regain some low RPM compression, but there is always a compromise. I just wonder if the difference will be enough to help idle (MAP sensor based calibrations). However, I need to confirm if the alpha-N based calibrations can idle this setup as-is. Supposedly the first tuner attempted this, but it never did idle consistently.

EDIT: Camshaft change in the near future, should be road-worthy come this spring.

[vietkid_2006]

i want to see pictures of your bisi headers

[HondaFan81]

vietkid, PM'd.

[zigg_1311]

If this thing dynos as 250whp and has and at least 180ft. lbs. of torque, Im doing a F/D swap instead of a k24 into my civic, I really would much rather go F than K.

[cloudasc]

EDIT: Camshaft change in the near future, should be road-worthy come this spring.

What camshaft are you changing too?