blade7

I see people selling early engines claiming the 220 bhp cars benefit from forged cranks, rods and pistons and the later cars make do with cast, my thoughts are it's only the forged rods that were replaced, anyone have any definitive info and if I'm right when were the cast rods fitted.

lart951

Early na's had RARST forged rods so it did every 951 from 86-89.

blade7

Cheers, as I thought. Are all RARST forged rods the same part no. and all the cranks forged too ?.

lart951

early rods are part #944.103.101.3 and late part # 944.103.110.0

fortysixandtwo

All Crankshafts in the 944-968 series were forged.

blade7

Thanks guys, BS on everything but the rods then, I think the early 220 turbo discharge pipe was single skin hence larger internal bore, anything else spring to mind better on the early engine ?.

Darwantae951

Either Oddjob or Brian Broderick posted some info on 89 Turbos not having the RARST rods.

lart951

the last two 89's I did had the rarst rods maybe some didn't

Dougs951

The discharge pipe on my 220 car is double walled.

Paulyy

IICR all 944 turbos had double wall down pipes and X-over pipes

Oddjob

From what I have found, the factory transitioned from forged rods to cast rods during MY89. I have seen late production MY89 M44/52 engines w/ cast rods. Early 89s have forged rods. I do not know by what serial/VIN number the transition was made. I think most will say that MY90+ RoW engines all used cast rods. PET also matches this.

I recall some others also commenting on having torn down mid to late production 89 motors and have found cast rods.

Dougs951

Wow, Didn't know that.

Learn something new everyday.

lart951

I say it before I say it again 86 951's rule, 89's suck. lol

Bri Bro

Not me, never had a 89.

Oddjob

Came up in this thread, posts #20-#30. Interesting comment from Chris Cervelli about the same cast rods being used on 968 Turbo RS motors...

https://rennlist.com/forums/showthre...ferrerid=15894