944 engine rebuild
Discussion
Its time in porkys life for an engine rebuild.
its a 944s2 135k burning oil mainly at high revs. im in the kent area, im looking for a local-ish place to do the rebuild but not having a lot of luck.
Any one got any suggestions? also has any one had an s2 engine rebuilt so to know a rough guide price of how much im looking at.
Ash
its a 944s2 135k burning oil mainly at high revs. im in the kent area, im looking for a local-ish place to do the rebuild but not having a lot of luck.
Any one got any suggestions? also has any one had an s2 engine rebuilt so to know a rough guide price of how much im looking at.
Ash
On the 104mm bore size engines (2.7 944 and 3.0 S2 and 968) if your bores have wear you will need oversize pistons at about £1000 to £1500 for a set of 4 and a rebore with alusil etch lapping costing between £140 (cheap and nasty) and £400. Not to mention everything else.
However, there is a company that we deal with who will provide a completely rebuilt exchange short engine (engine without head, belts or water pump) for about £2500. Not only are the engines completely rebuilt and better than new (built to higher standards) they also use the latest technology in bore surface technology which is even more robust than the original material.
contact us for details and we will put you in touch with them.
On the other hand, you may be expecting the worst, but there may be other reasons for your oil consumption... Best get it checked out by a specialists garage
All the best
Jon Mitchell
Independent Porsche Specialists
Bournemouth, UK
www.9xx.co.uk
However, there is a company that we deal with who will provide a completely rebuilt exchange short engine (engine without head, belts or water pump) for about £2500. Not only are the engines completely rebuilt and better than new (built to higher standards) they also use the latest technology in bore surface technology which is even more robust than the original material.
contact us for details and we will put you in touch with them.
On the other hand, you may be expecting the worst, but there may be other reasons for your oil consumption... Best get it checked out by a specialists garage
All the best
Jon Mitchell
Independent Porsche Specialists
Bournemouth, UK
www.9xx.co.uk
135,000 miles on a 944 should not be enough to cause a rebuild, and most CERTAINLY not enough to cause a bore job.
Here's something Gene posted a few days ago, from Wally Plumley, of 928 Specialists. As many know, the 928 and the 944 share the same metalurgy, cylinder head, and basic block design. I bought one at 135,000 miles and it's still running very sweet at 170,000, and I have a friend who ran his up to 300,000 before the cylinder head had to come off.
Dogsharks
"The 928 block is made of Reynolds 490 high silicon (not silicone) aluminum
alloy. It is precision cast, with controlled cooling for the bores, so as
to bring the silicon to the surface. After boring and honing, the block is
chemically hones to remove a very thin layer of aluminum from the surface
of the bores, leaving a very hard, slightly porous layer of silicon for the
pistons and rings to rub on. Since aluminum does not function well rubbing
against this silicon surface, the aluminum pistons receive a very thin
coating of iron as a wear layer.
Net results:
The cylinder bores are perhaps the longest-wearing ever put in a production
automobile. It is virtually unheard-of for a 928 engine to wear out.
Reboring the cylinders is possible, but requires special care and
knowledge, and usage of a chemical honing treatment to establish the
silicon layer.
Replacement pistons must have an anti-galling wear layer, such as iron,
applied. This coating is rare and expensive in aftermarket pistons.
The block can be bored, and then have iron sleeves installed, but this
eliminates much of the advantage of the Reynolds block."
Wally Plumley
928 Specialists
Here's something Gene posted a few days ago, from Wally Plumley, of 928 Specialists. As many know, the 928 and the 944 share the same metalurgy, cylinder head, and basic block design. I bought one at 135,000 miles and it's still running very sweet at 170,000, and I have a friend who ran his up to 300,000 before the cylinder head had to come off.
Dogsharks
"The 928 block is made of Reynolds 490 high silicon (not silicone) aluminum
alloy. It is precision cast, with controlled cooling for the bores, so as
to bring the silicon to the surface. After boring and honing, the block is
chemically hones to remove a very thin layer of aluminum from the surface
of the bores, leaving a very hard, slightly porous layer of silicon for the
pistons and rings to rub on. Since aluminum does not function well rubbing
against this silicon surface, the aluminum pistons receive a very thin
coating of iron as a wear layer.
Net results:
The cylinder bores are perhaps the longest-wearing ever put in a production
automobile. It is virtually unheard-of for a 928 engine to wear out.
Reboring the cylinders is possible, but requires special care and
knowledge, and usage of a chemical honing treatment to establish the
silicon layer.
Replacement pistons must have an anti-galling wear layer, such as iron,
applied. This coating is rare and expensive in aftermarket pistons.
The block can be bored, and then have iron sleeves installed, but this
eliminates much of the advantage of the Reynolds block."
Wally Plumley
928 Specialists
thanks for that, ive still not booked it in yet. seems to take ages for any one to get back to me. im tempted to go to HP motorsports in essex as they are close enough to home. the place in birmingham is just too far for me really. bourne performance are doing a quote at the moment. if there are any more suggestions let me know, working on a max budget of 2500
the bores arent that durable ,and if you add a little heat the piston and rings can expand more than the bore and since the clearances are so tight it scores the bore and sometimes badly ,also if the big end bearing starts to wear this also scores the bore ,Ive got 2 944 s2 engines stripped with scored bores in no2 cylinder
I think its the head gaskets thats gone on mine not stripped it down but had a look down the plug hole with a camerea and theyre scored ,I bought a spare engine that suffered timg belt failure it had bent valve but I was hopefull with the bores as it was lowish mileage ,but no luck no2 has a wide band of scuffing and no4 has a few marks ,so Ive got a really loverly 944s2 and 2 knackered engines lol
but lots of other spares to throw on ebay like cams ,tappets etc
but lots of other spares to throw on ebay like cams ,tappets etc
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