Eric_Oz_S2

Yes, I was at rennsport. I'm back in brissie for a few days over the weekend, so hope to get a chance to tear it down. If I'm lucky it is only a head gasket and rings and maybe a broken lifter.

If it turns out the bore is scratched then I'll be in contact for the alusil guy.


Thanks mike, I'll see how it goes.

Paulyy

I hope it's nothing major! I honestly think it's just a head gasket. The tapping could be just low oil. I've heard of that before.

Eric_Oz_S2

4k for a rebuilt engine isnt too scary. At least a rebuild can up the quality of the pistons and rods over stock. I'm more concerned about time. Don't want to be without my toy for too long!

Eric_Oz_S2

Thanks - I hope so! I'll post some pics once I have the head off. I guess if the head gasket has failed it could deprive lifters of oil?

Track video showed no drop in oil pressure even though I lost 2 litres and was still running at race speed!

Paulyy

IICR you mixed oil and water? was that in the cooling system or sump? Sometimes the lifters would tap if my oil is ready to be changed. When i ran 30w run in oil, my lifters would just tap. wasn't loud but annoying. As soon as i got my 20-60w in, it went back to normal.

Eric_Oz_S2

No evidence of mixing of oil and water, but both leaked out separately. It is only lifters for cylinder 1 (with low compression) that are noisy.

Paulyy

That's strange. Blue or white smoke?
Well if you blow the HG there will be less pressure above the head so the tapping is possible from lack of oil.

When do you think you'll rip into it?
IMO when you do it, Prepare yourself as you're going to remove the engine. big jackstands, ect. As you don't want to do this after you've pulled apart the engine. A spare box or 2 for parts & Zip lock backs. (so when you take things off, you label them E.G 'intake screws & washers' and box them)

Eric_Oz_S2

Well - it seems I have a scored cylinder 1:


Crap.

Sorry for the crappy photo - its an iphone pic off my laptop screen. The top line I guess is the top ring extent, and the scoring above due to a failed/overheated piston. The white dots I'm guessing are little bits of aluminium from the piston.

So it seems that I blew the headgasket, overheated cyl 1 and trashed the piston and bore. Other cylinders look good.

So do I rebore just the one cylinder to next oversize or do all 4?

Or do I go the full hog with new pistons, liners, forged rods, etc?

Anyone know of an Australian company that does Alusil rebores?

Paulyy

Call up
http://www.buchananautomotive.com.au/ (Sydney)
or
www.fitz-racing.com.au (Melbourne)

They both specialise in porsche. They might have an answer for you to do with the bores.

IMO i would get new forge rods and pistons. You may aswel since you've supercharged your engine. You could even slightly bring down the compression and run a higher boost level and increase your power. by looking at your compressor map for the SC you can run it at 100,000 rpm at redline and achieve enough airflow for 400 hp & 10-11 psi.

Just a thought.

blade7

Other than a decent used short engine, bored/honed/lapped Alusil and new compatible pistons would probably be the most cost effective uprate route.

333pg333

Yes, call or PM Sean / JET951. He'll point you in the right direction and can source all the parts you'll need. You could even ship your block down and they could send you back an assembled short/long block perhaps?

Sean found something along the same lines on the 2.5L that was in my car during the incident. Just another little bundle of joy.

mikey_audiogeek

How about a 968 short block? Gets you piston squirters and pistons with more taper.

Paulyy

That would get expensive in Australia. just because there's not as many 968s getting recked to even find a 968 short block.

Eric_Oz_S2

The unfortunate thing is shipping an engine from overseas is horrendously expensive (you would be really lucky to finda 968 engine here). Figure about $1,000 with most of the cost in the port handling charges at this end (the sea freight part is only a few hundred). Obviously air freight is more again.

Eric_Oz_S2

Was that from a Foreign object or over boosting or overheating?

It seems like cylinder scoring is quite common on raced engines?