svtlrtls

Hi,

I read in a UK magazine (exact publication eludes me at the moment) that S2 cylinder bores aren't rebuild-able like a 2.5 liter bore. Is there any truth/substance to that?

Stated another way, once the cylinders have been worn/scored beyond a certain point, what options are available to return the engine to a service-able state?

Cheers

Mikes3.0cabturbo

hope not otherwise my rebuild is in trouble, I am just in final hone stage of a 104.5mm rebore and new pistons on a S2.

rgds
mike

Scootin159

All 944 blocks cannot be honed using the same methods as most engine blocks due to the material that the block is made out of. That said, there are a FEW shops out there that do have the correct equipment to do the process, and I don't see any reason you couldn't do the same to a 3.0L block that you could a 2.5L block.... or course I'm no expert.

There's also the sleeve option that Chris White uses. He basically just removes the old bores and replaces them with entirely new iron bores (which then allows the same processes to be used as used on any other engine).

svtlrtls

Hey Mike, I was watching your thread just to see what you'd do.
Please keep us in the loop.
Cheers

svtlrtls

Hi,
Here's one publication that mentions the general concern but I can't find the reference that they promise.

http://www.cannell.co.uk/Road_tests/...04_944S2BG.pdf

See page 7 of the pdf - last full paragraph.

Thom

Unlike what's written in the article linked above, the block is made of Alusil, which is actually rebuildable up to a certain bore size.

http://www.msi-motor-service.com/dow...804-02_WEB.pdf

svtlrtls

That's a good bit if info.
I'll give that a read.

Thanks

svtlrtls

Yikes! that was a tough read but it did contain the information I was after.

Thanks again.

JET951

Hi svtlrtls , We had a customers 944S2 bored to the first oversize recently to accept Mahle Motorsport pistons , worked fantastic with a slight increase in compression from 10:9 to 1 , to 11 to 1 , with no problems and quiet in operation as opposed to the two wet sleeved ones we have done in the last 18 months or so.
Regards .BB.

svtlrtls

That's good news BB, Thanks

Thom

Which piston/cylinder wall clearance did you go for ?

JET951

Hi Thom, Factory spec clearance for the Mahle,s .
regards .BB.