bpp944

dd

IPSC

Do the water jackets line up? That would be my concern.

IPSC

Sam Lin

They're identical blocks. Differences are in bolt-ons, meaning the oil pan and balance shaft covers.

Sam

hacker-pschorr

Head studs are different.

If you are using a 944S block for a 944 turbo engine. Please contact me, I'm interested in the head studs you take out of that motor.

Thanks.

M758

Pistons are vastly differenet.

I am assuming you need those too since throwing rod damages pistons.

Legoland951

Use any later (85.5+) blocks since the balance shaft cover on the driver side has or can be drilled for the oiling hole. The earlier blocks have different covers and they are machine to mate to the specific block. It will cost you more in machining than its worth if you use the early balance shaft cover.

bpp944

All, I posted this for a good friend who is computer/internet illiterate. Here's the skinny: He owns an '87 944S parts car (he wrecked it 6 or seven years ago) He found a 951 that threw a rod, but is in great shape otherwise. He's thinking of picking up the 951 and rebuilding the engine using the 944S block. I had no idea if it would work, so I turned the question to all of you.


Sam Lin, I'm happy to hear this, but does your response mean that the oil pan and Bal-shaft covers won't bolt up? (would it be possible to use the 944S pan and bal-shaft cover?)
Hacker-Pschorr, I'll see what I can do.
M758, That was my ussumption as well.
Legoland951, The block is an '87 944S.

hacker-pschorr

I've go dibs on what's left of the head - and the head studs.

I have a spare 944S block missing a head and studs.

inactiveuser92616

I read, in a very old writeup (posted here recently) reviewing the 944 Turbo when it was new. The writeup said that the turbo block had thicker cylinder walls. True or not, I do not know.

sh944s

I built a 951 engine using a 944S block and it has 3 years of hard track use at elevated boost (15psi) with no issues what so ever. The head studs are not different and all 951 components bolt right up. The balance shaft cover oil feed to the turbo exisits in the 944s balance shaft cover. It has been a while since I had it appart but as I recall all I needed was an O ring seal to connect the oil line.

nine-44

Scott has it down. You should only need to pull a plug out of the turbo oil supply port, 5 or 6mm allen bolt, no biggie. The oil pan should be the same deal, the turbo oil return is there but plugged. You'll have to use the driver's side bracket for the motor mount, it is equipped to mount the turbo onto it. I'm putting an 87 NA block together with my dad's 86 Turbo guts and head, etc. Brian Perry used an 86 block in his 87 turbo, I don't recall if it was an NA or turbo block tho. The oil filter/oil cooler housing will be the trick depending on the year of the turbo block. They changed oil pressure releif valve styles about 86MY. I hope I can recall this straight, ok, here's a shot, AND PLEASE CORRECT ME IF I"M WRONG, you should be able to use the pressure releif valve from the block you are using with the 951 housing. I'm almost positive this is what I had to do on dad's engine, I did it last weekend, and have not started it or even put the engine in yet..

hacker-pschorr

That's interesting, I sold a damaged (scratched wall) 944S block to a friend of mine for his turbo. Not sure what year, but he measured them and had to swap over the head studs from his cracked 951 engine. He was able to use the lower studs.

bpp944

Thanks for the info guy's, the engine swap is a GO!!

M758

Just remember that the balance shaft covers are matched set to the block. Moving covers from one block to another will cause either leakage or binding of the balance shaft. There are numbers stamped on the covers and the block These need to match.

bpp944

Got it, Thanks M758..