Oh no, not another motor destroyed...

[DriftingisLame]

I was at the dragstrip for the first time with my new motor about 3 weeks ago. It had been pulling very well at 14 psi, for a few months, consistant 12:1 A/F ratio. I knew something was wrong when my trap speed was only 1 mph faster than on my stock turbo at 12 psi. I didnt notice when it stopped pulling hard, it may have been 3rd-4th gear, as 1st and 2nd felt like a cheetah on crack! I ran once more time and then parked it, as I had developed a misfire. I checked for codes and found a knock code. It had a loud tap every time it would misfire, sounded mechanical, coming from the head.

I figured this tap could be some sort of stuck lifter, or something having to do with the lifters, hanging a valve open slightly, causing no compression, and a misfire. I removed the lifters and had them rebuilt, as it was a good idea anyway (they're super quiet now!).

Blah blah blah... Long story short, The car developed a bit of a very random smoke, blue, like burning oil, out the exhaust. I fixed the misfire until it got a little hot again, I swapped coil packs, spark plugs, checked injectors, and all connections. I went to get on it, as I thought I had fixed the misfire, and the car started smoking again, and missing. I pulled into my buddy's garage and parked it, smoking, tired and pissed off, I went in and had myself a nap. I came back to a big puddle of oil (coming from the PCV). And there it stays...

I havent moved it since then, Havent had much time to work on it. I did however get to comp testing cyl 1-4. 135, 135, 140, 135, ***, ***.

I could have sworn my misfire was on cylinder #1, so I thought that would read low compression, perhaps a broken ring land. I'm rather suprised the compression numbers are even thus far.

I really didnt need this right now..

Any constructive comments appeciated, should be getting to cyl's 5-6 by tomorrow.

Thanks...-Max

[ryan15]

Also what where you tuning with? it sounds like you might have been running a little to much timing and it popped a ring land, although i doubt it. That happened in my gs-r turbo a long time ago from to much timing, but then again its a honda with high compression ratio and weak *** ring lands, best of luck hopefully those last 2 cylinders come out clean.

your in eugene? let me know if you need any help with anything, and also whats your setup?
Modified by ryan15 at 8:54 PM 10/26/2007

[Carl H]

safc = dead.

[DriftingisLame]

An SAFC did not cause my motor to die. Although, my timing was never actually dialed in, I could never get a proper reading, and my idle would fluctuate.

Perhaps it was my timing light, but as a safety measure, I left the CAS on the more retarded end of its travel (felt much slower like this, but I could sleep at night). Although the injectors were at a high duty cycle, they were not "maxed" out.

The SAFC is no standalone, or even a very good device for tuning, but the % correction I had was about +/- 5% and mostly never adding fuel. Does anyone know how damn rich our stock maps are? People use the SAFC as a scapegoat for many problems, but I'm sure it didnt cause this.

I'm thinking either there was a small hairline crack in a piston when I got it, and it finally let go. Or maybe I did have messed up timing.

Either way, I'll post the compression numbers after work.

I'm in phoenix AZ right now BTW, for school.

Thanks guys, -Max

[DriftingisLame]

135, 135, 140, 135, 150, 0

Is cylinder 6's connecting rod possible to remove by taking off the oil pan? Will the piston clear the crank shaft?

[ryan15]

This is a pic of an rb25 bottom end, these pics are telling me no, even know the bores are like 5mm smaller or something liek that, but I doubt that will make the difference

[Carl H]

pistons must go out from the top...

[DriftingisLame]

I guess I'll be pulling my head tonight.

Damnit