Hi guys.
I've got very little compression on 3 cylinders after 1/4 mile pull.
It's a b16a2 running 8psi with 270whp.

I was racing on Sunday, and as I let off the throttle at the end of the 1/4, plumes of white smoke started coming from the exhaust.
I presumed it was head gasket, so I took it apart today to check. The gasket looked fine. I checked the Block and the head to look for anything obvious, but it all seemed fine.
I turned the head upside down and poured some turps in the combustion chamber to see if there was an obvious leak. - nothing.
I poured some into the cylinders to see if the Piston rings were fucked. - nothing.
I put on a new HG and torqued to spec and the same 3 cylinders gave me the same readings.

What could cause white smoke and low compression on 3 cylinders?

 

Did you take a straight edge to the head? Are you using head studs or factory bolts? If bolts did you measure them to see if they stretched?

 

I checked the timing before I took it apart and it was fine. (And poor timing wouldn't cause steam) AFAIK.

 

I'm using arp head studs.
I didn't check the head with a straight edge. I feel like such a noob!!!

 

Cracked ring lands bro <br /><br />Theyre prolly still in place <br /><br />Do a leak down test

 

Is it likely that 3 Pistons cracked their ring-lands on one run?

I'm leaning towards a warped head at the moment. Just because:
Cylinder 1 - 4bar
Cylinder 2 - 6bar
Cylinder 3 - 8bar
Cylinder 4 - 15bar

If the ring-lands went, it wouldn't really cause steam. Plus I checked the bores and they were in good condition.
Of the ring lands went, I'd expect some scoring.

 

When my ringlands went nothing was damaged, everything stayed in place till I removed the pistons then I had chunks of ringland in my hand. It 100% sounds like your ringlands gave it up.

 

Would that cause white smoke?

 

Put compressed air into the cylinder with the valves closed. You will be able to easily tell whats messed up by where you hear the air escaping from. I pressured up #3 and had air roaring out of my catch can. No-brainer at that point.

 

That psi is stupid low <br /><br />Leak down test for sure doesnt matter what anyone says <br /><br />Is smoke coming out of the catch can? Does the motor even run? Any shavings in the oil?

 

<p>Oh hey, a DIY I've covered in my build thread!</p><p>https://honda-tech.com/honda-civic-d.../#post50363409</p><p>Do that. &nbsp;It'll tell you exactly where your air is going.</p>

 

Yeah it's only a small turbo.
Yes. Smoke is coming from the catch can.
It does run if you keep the revs up but it doesn't want to idle.
Oil looks fine.

 

I meant ur compression test results if thats what those numbers were