Do you think the 951 Forged Rod can handle 360HP/400TQ, max 6500rpm in a 3.0 Turbo?

 

An all bore 3.0? The 951 rod would be too long in a stroker.

 

968 Block

 

So a sleeved block for an all bore 3.0? If you use a longer stroke crank the rods must be shorter to match, or the piston hits the head. Generally with a stroker people use the 3.0l rods or an even shorter rod that reduces compression (the piston does not reach the top of the bore.)

-Joel.

 

Songzzz,
Yes should not be a problem
Just change the bolts to better
specs. What about the heads ?
BTW will call you tonight.

 

Joel, 951 Rod length = 968 Rod length. No?

 

J Chen, my 968 engine will be here tonight. Want go check it out?

 

I would suppose the 951 rod is (88mm-78.9mm)/2 shorter (4.55mm) since the 3.0 deck is the same as the 2.5l. Some engines, like the 302/351 and 4.6/5.4l Ford increase the deck height with the stroke to deal with the longer stroke, but Porsche did not do this. If you put 951 rods in a 3.0 block with a 3.0 crank it will not spin.

-Joel.

 

In terms of length, if 968 rods = 951 rods, I don't see any problems. Porsche did not increase the deck height, but IIRC wrist pin is positioned differently for the 968 pistons.

 

I don't think so. People generally use stock 951 pistons with the 3.0 crank and rods to build a 2.8l stroker. If the wristpins were lower on the 951 piston that would not work.

-Joel.

 

Joel, that's why Andial sells pistons
with different wrist pin position to
to go with the stroker crank.
Sorry Songzzz busy, but if possible
lift the head off to check that the
bore is o.k not scruffing etc.

 

Joel, you cannot use 100mm piston in 104mm bore.

 

Of course not. People use the 100mm 951 pistons in the 100mm 2.5l bores, put in a 3.0l crank and rods, clearance the block (or the rod bolts hit)and get a 2.8l. For a 3.0l you need different pistons, and you can use the pauter forged rods, which I believe are even shorter than the 3.0 rods, or you can use the stock rods and the new 104mm low compression Mahle piston. My point was that _if_ the pin-to-crown distance was different on the 2.5l piston and the 3.0 piston, this common 2.8l motor would not work.

You could also get pistons with a much smaller pin-to-crown distance but that may not be the best idea. 4.5mm is a ways.

-Joel.

 

Are you sure you can build a 2.8 Stroker using the 951 pistons + 3L crank and rods? This is new to me.

The only person that I know using 951 pistons for 2.8 Stroker is dmmofit, however the pistons were cut and shorter rods were used. IIRC.

 

Jeol, the pin/crown distance for
the 951 & 968 engine is indeed
different with the 968 piston
having wrist pin closer to the
crown & hence the ability use
951 con-rods as drop inreplacement.