B230s? Do you know how much the pistons were sticking up, if any, before reassembly?I have run several .027" Cometic gaskets on redblocks, nothing has collided yet.
Do you have a write up of what you've experienced on the .024" squish motor and if it's been more beneficial than other tight squish motors you've done? Or any other links to more recent areas of your gallery, it's been a couple years since I went through it. I'm sure it's better, but it's probably by a hair. Then again, a lot of hairs add up, and that's what some of us are here for. A LOT OF HAIR! Seriously though, what were your thoughts on that setup? I guess some of the benefit would be from the slightly raised compression ratio, if nothing else.Yes again. Rebuilt, as in boring of the cylinders and new pistons. Or 'refreshed' as in measured and bores honed, with pistons cleaned, measured, knurled and fitted to restore piston to wall clearances to ~1.5 thou [0.0015-0.0017"]
Remember, the rule of thumb for squish clearance is a guideline for safely getting into tight squish on a build. The fact that rod stretch is not linear to rpm is accounted for in the guideline.
You might want to review what I wrote on pbase:
www.pbase.com/stealthfti/b230ftshortblock
....where I get into not only the advantages of going tight squish, but also a third corollary about going for optimal squish.
Which was in part the reason I built the 24 thou squish motor. For the purposes for which that motor would be used, I wanted to push the guideline a bit. The car's owner was given the assurance that if there was any problem due to the extra tightness of the squish clearance, my 50,000 mile warranty on the motor would fully cover it. at no charge.
It has over 60K on it, and it still performs excellently.
I would advise for you to shoot for a squish clearance in the low/mid 30s. At 35 thou, you have achieved effective tight squish. And I sure hope that you have an effective and reliable rev limiter on that motor. For those times in the heat of battle that someone misses a shift.....haha
TF
I know there are a few out there that have slapped on the .027" gaskets on top of untouched b230s, but getting them to comment in here seems a bit harder than a personal message.
To be honest, I think we are going to risk running tighter squish than that. In part to be as efficient as possible, in part to raise compression as far as we feel safe doing, and in part to experiment. It doesn't take too long to do a headgasket, especially if we use Hylomar, and we have a little over a month left to do some testing once re-assembled.
As far as redline goes, it's LH2.4 but raised a little bit. It doesn't hit ignition cut until at least 7500rpm(I don't know if the ignition chip has a rev limit, basically), but the fuel cut, which is what normally kicks in first on an LH car, should be around 6500.
On another note, were you referencing to anything specific when talking about oil pressure?