MM951

Do all 83 944 engines have forged pistons? Is this fact or rumor? I just picked up 2 engines... 1 good 83 engine and one S engine with a cracked block.. Just wondering..

sharky47

I thought it was forged rods on the 83's


I could be interested in "S" parts........

jgporsche

I believe 84 and later all had forged rods. i read that in the workshop manual.

tod84944

Yes, all the 83's had forged pistons and rods. They started using the cast pistons and rods in mid 84MY

jgporsche

i just rechecked the workshop manual and it says FEB '84 and later had forged rods.

KuHL 951

The 83 and up to mid-84 were all forged rods. But don't confuse forged NA rods with forged turbo pistons though; two different animals completely. What page did that info come out of the Shop Manual?

944CS

Jgporsche you are not reading the workshop manual correctly. It states that the rods were forged steel/cast since february 1984. This means that all 944's produced before sometime in february of 1984 had forged connecting rods. The pistons in the USA market cars are cast, the Euro pistons are forged. All 944 Turbo's came with forged rods and pistons. All cranks are forged.

schwank

Hmmm... interesting thread, didn't know that. So what I need to do is swap the rods and maybe pistons from my 83 block into my 87?

I know there is an early-to-late engine swap thread somewhere....*runs off to search*

944CS

your '87 pistons have a higher compression ratio, 9.7:1 vs. 9.5:1 for the '83....there is nothing wrong with cast rods, and you are risking screwing something up in the process

tod84944

87 pistons actually have the same compression as the 83's, it is the 88 pistons that have the higher compression ratio.

schwank

I plan on building up the 83 motor out of the car and then just swapping it out... nice to have a spare. Plus the 87 has 155K the top end is brand new but I am pretty sure the bottom end has not been opened. Not sure what my path will be just yet, but still good to know some of the differences between the two. Any way to tell from the outside, like casting marks on outside edges of the rods or what?

Camaro_Muncher

Ive got a '84 with a build date of 9/83, what do i have?

944CS

Not true, '87 944 and '87 924S have 9.7:1 compression. It is a fact. '88 cars had 10.2:1.

tod84944

944CS, you might want to double check your info on the compression ratio for a 87. I don't have access to the shop manuals at the moment, but I pasted this chart from Paragon Products.




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Engine Production < 924/944/968 < Main Page

Engine Production
Author: Skip


Engine: (USA values - to locate the "code", look for another Tech-Session article regarding Engine Identification)




944 - 8 Valve, Normally Aspirated

MY Code Size Comp HP TQ Max RPM Weight Note
83-85.1 M44/02 2479 9.5 147 137 6500 366 Man
83-85.1 M44/04 2479 9.5 147 137 6500 366 Auto
85.2-87 M44/07 2479 9.5 147 137 6500 366 Man
85.2-87 M44/08 2479 9.5 147 137 6500 366 Auto
88 M44/09 2479 10.2 158 155 6640 373 Man
88 M44/10 2479 10.2 158 155 6640 373 Auto
89 M44/11 2681 10.9 162 166 6560 366 Man
89 M44/12 2681 10.9 162 166 6560 366 Auto

944S - 16 Valve, Normally Aspirated

MY Code Size Comp HP TQ Max RPM Weight Note
87-88 M44/40 2479 10.9 188 170 6840 386

944S2 - 16 Valve, Normally Aspirated

MY Code Size Comp HP TQ Max RPM Weight Note
89-91 M44/41 2990 10.9 208 207 6480 386

951 - 8 Valve, Turbocharged

MY Code Size Comp HP TQ Max RPM Weight Note
86-88 M44/51 2479 8 217 6500
88S-89 M44/52 2479 8 247 6500

968 - 16 Valve, Normally Aspirated

MY Code Size Comp HP TQ Max RPM Weight Note
92-95 M44/43 2990 11 236 225 6500



Last Modified: 2004-05-11 Number of views: 2497



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MM951

So is it only Euro 83 cars that had forged pistons or all? Is there any identifyng mark on the piston??