flipo

Hello ;

I'm building a turbo rs replica using a 1993 968cs as a base and a 944 turbo s as a donor car.Most of those who already made the conversion use the 2.7L cylinder head on the 3L block because it fits whitout any machine work .I do not have a 2.7L head and finding one isn't easy .Can I use the 951 head (making the needed adjustments )and what kind of differences will it make in hp and/or torque?

Thanks for the help

Filip

flipo

Second question ,has anyone got pics of there intercooler setup

RajDatta

You can use a 951 head. You will have to modify the water jackets. Lindsey Racing offers such machine work. The valves will be bigger in a 2.7 head so you will make more power with a 2.7 head.
Raj

flipo

Is this a signifficant power difference??

flipo

Surfing this forum (I'm new here) I also found a couple off supercharger kits (sfr and ninemeister) are these a good alternative to the turboed 968 ? they apear to be less expensive andeasier to instal or am i wrong ,has anyone any experiences with speedforceracing?

User 41221

nm

Regards,

flipo

I made my decision to go for the 8v turbo option ,but i'm still not sure about the head as I understood the 944 2.7l head has bigger intake valves ,sinds I'm planning on installing new valves +valve seats anyway can't I just put bigger intake valves in my 951 head?

RajDatta

You also need to consider the combustion chamber. 2.7's and 968's have 104mm bore while if I remember correctly, 951's have a 100mm bore.
Raj

flipo

Ok I must find me an 944 2.7L head ,but to get one of those it seems like i will have to buy a complete car.I just spoke with Tim at SFR and he sugested that the 16v head 3L is a valid option too.Any opinions ?

RajDatta

Yes, they make lots of hp. The design is excellent and more modern.
Raj

FRporscheman

I have a spare 2.7L head for sale. It has turbo valves and springs already too!

I think the 8v turbo is a great choice for lots of torque and burning rubber. And I can give you some advantages of a 2.7 head over a 2.5 head: It has larger intake valves, the correct bore, it bolts on, and it has no ceramic liners in the exhaust ports which always break off and can kill the turbo.

Just to be fair, the 2.5 head has advantages too: It can be cheaper to buy a 2.5 and weld it, than buying a 2.7. Also, 2.5 intake valves are much cheaper than 2.7 intake valves. But both heads should use the 2.5 turbo exhaust valves.

RajDatta

The other benefit to 2.7 head is that you can actually port the exhaust side because there is no ceramic lining.
Raj

flipo

Isn't the point of the ceramic lining to create better flow in the first place??

PorscheDude1

The intent of the ceramic liner is to keep the high energy hot exhaust for the turbo, and insulate it from heating up the coolant.

RajDatta

Ceramic liners are there to stop heat energy from dissipating, and transferring them to the turbo which helps spool the turbo. It is also better for emissions because it lights up the catalysts quicker. The bad part is that you can't do any port work on them and if the ceramics can chip off, as stated and kill your turbo.
Jon Milledge, a very well known tuner prefers non turbo heads for this very reason.
Raj