Porsche 944s2 engine

[924Guy]

Back already with your info.

Turns out the 928 shop actually sent his block to US Chrome for Nikasil plating and honing:

US Chrome Corp of Wisconsin
650 Oak Park Ave

Fond du Lac, WI 54935

(866) 922-5066

As for Diamond Racing:

Diamond Racing

Ask for Nick ([email protected])

http://www.diamondracing.net

+1 (877) 552-2112

(OEM Replacement design should be on file)

Hope that helps; feel free to email me direct if any further questions about the build...

We also found a very good machine shop in town, eventually, for the balancing etc... not sure where you're at, though - please add your location to your profile!!

[GKR_17]

Back already with your info.

...Nikasil plating

not legal for an IT build.

[NORRIS]

not legal for an IT build.

What if the OG block was Nikasil?

[joeg]

I believe Porsche did treat those bores OEM.

Sounds like a very expensive rebuild.

Porsche...accept no substitute!

[GKR_17]

It would be legal to apply a Nikasil coating on an engine that came with the coating as OE. In that case, it would need to be identical to the original spec (try policing that).

As far as I know, the only cars currently listed that came with Nikasil coating were the ITR Porsche 911's.

The 944's came with Alusil blocks, which is an alloy, not a coating.

[924Guy]

Definitely an expensive rebuild, either way you look at it! Yeah, pistons were around a grand or so for the set, IIRC. Best thing would be to talk to US Chrome about it, if not Jon Milledge.

Again, the car I reference was not an IT car, so coatings not a concern - but a good point.

[anthony1k]

Back to the original question: to sleeve or not to sleeve.

Both have pros and cons. Sleeving (dry) is a common procedure that many good machine shops can handle. Cast iron sleeves are fairly inexpensive. Alusil honing on the other hand requires specialized equipment and knowledge. Most likely the block will need to be shipped to one of few shops that can do it. In the end honing will most likely cost more.

The risk with sleeving is that if it is not done properly, it will result in catastrophic failure. 3.0 blocks are expensive and are getting hard to find. If the engine builder and the machine shop have done sleeving on 944 engines before, I'd say go with it. If not, look elsewhere

Another thing to consider is timing. There is zero margin of error in these engines. Make sure that the builder knows how to set the timing after the compression change.

[GKR_17]

It would be legal to apply a Nikasil coating on an engine that came with the coating as OE.

On second read, application or use of coatings are prohibited. It does not say except as stock.

So under a strict read of the rules, OE engines with Nikasil coatings are not legal. Clearly a stock engine should be legal, but it may be a very tough sell to say that this allows the coating to be reapplied if it is removed for some reason.

[924Guy]

Per the factory manual. Actually, it's not really a coating in the '44 motor... but perhaps the 911 guys would still be at risk for some rules nerds.

I recall the Saturns having a similar problem with the stock piston skirt coating on their engines...

[Ron Earp]

So under a strict read of the rules, OE engines with Nikasil coatings are not legal. Clearly a stock engine should be legal, but it may be a very tough sell to say that this allows the coating to be reapplied if it is removed for some reason.

I noticed that rules problem too. One of the ITR cars I considered has pistons that are coated from the factory. Now, of course you can buy OEM pistons and they will be coated too, so you don't have to apply coatings. And naturally the stock motor has pistons that are coated. But the rules say no coatings period.

Illegal car right out of the box.