George D

There is a S2 head for sale for $900 here. The current head on my 3.1 is from a S2 with little head work, larger exhaust valves and a factory hydraulic cam with a timing gear. You can see the head is the bottleneck on a dyno, but this is at 550whp on a mustang dyno. You don't feel the drop in power when driving the car, and I don't have to index the cam. A friend of mine has solid lifters on his 3.0, my old 951, and he's running 24 lbs of boost using methanol injection. His car is fast, but can't pass me at 15psi. We did our annual sports car trip to Greer, and Jeff's car was very close to the power of my car, but if I was boosting to 24psi, I'd run away from him once hooked up.

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Patrick:

I am going to build a unique Hybrid Stroker with a lot of help from Shawn and Sid. I am not sure it is worth the effort on the 16V head. If I get numbers anywhere near Shawn's I will be very happy. How much power do you need on the street? Well, guess I should not say that as my nearly 400HP daily driver is not enough. However, I currently need 20 psi to get there, on this big block, I can probably do it at 15 psi and have gobs more torque. Deal is done, I will pick up on Friday 75% complete S2 block and peripherals, no head, no pistons, no rods. Flying to Colorado on Monday hope to have long discussion with Sid and Josh. I will most likely add the piston squirters whether I need them or not. Just like the design and the fact most people don't have them.

George:

Thanks for the clarification.

Black51

Very cool! Maybe I should do this sometime.

Pfc. Parts

Thanks both of you for describing some of the possible block platforms. I haven't confirmed the block used in the S2 Cup yet but had assumed it was the S2 with modifications.

Regards,

Darwantae951

George, you are running an 8V head, not a 16V. I think you meant a 2.7 head?

Pfc. Parts

At last (using multiple hints from this thread) I think I've verified at least the '86 Turbo Cup cars were 8V heads. This at least narrows some of my options. http://www.supercars.net/cars/5644.html I'm still not clear on whether a 3.0L Cup Car was ever built, or if that effort became the 968.

It stands to reason that since the cars were built in Europe they would be 8V heads. My understanding is the 32V head was introduced to meet US emissions and was of no benefit for track cars. At least that's what I've been told about the 928.

Ooops. Should have read "16V head" not 32V. Thinking 944 but typing 928

George D

Yes, from a 2.7. Jeff is running a S2.

George D

http://968turbo.homestead.com/

Cup or not, this is the base of many 3.0 turbo conversions.

Pfc. Parts

You mean the 16V head?

George D

No. The 968 Factory Turbo motors used an 8V head. I saw one at Motorsport and the intake and exhaust valves were smaller than the 2.7 N/A heads. We used the 2.7 head even though the OE 968 8V head was sitting there ready to be installed. Machine work would have ruined the OE "cool" factor.

Pfc. Parts

So just to be clear, you're running a 3.0 968 block with 2.7 heads?

George D

Also, the 968 Factory turbo motors used Nikasil/Nicom coating vs the N/A Alusil. The bores in my motor were Nicom plated. The term Nicom is based on the Mahle OE cylinder plating. Good information here: http://lnengineering.com/resources/2...ehind-nickies/

All Porsche race motors were/are Nikasil plated. http://en.wikipedia.org/wiki/Nikasil

You'll get plenty of reasons to use iron liners, stick with Alusil, build a MID motor, etc. I chose to follow the factory OE process using what they did back when this motor was developed. Call me crazy, but that's what made the most sense towards the end result.

Pfc. Parts

Not at all. That's exactly what I intend to do myself. Otherwise you may as well put a V8 in it and call it a day.

The trick is discovering just what that means Thanks for those details, I haven't found them anywhere else yet. I'm still trying to find out if the 944 Turbo Cup was ever run at 3.0L. It seems likely it was, but maybe only by the French in 90-91. Haven't found the specs on the final version yet but it looks to have been the French team that built it.

Pfc. Parts

Off topic, but this is why I've considered having my older 928 block done with nikasil liners before blowing it. Another factor is I haven't found anyone in the US that restores alusil. There's an outfit called Kuhn Performance (http://www.kuhnperformance.com/model...nder-treatment) that does the nikasil treatment on 944 and 928 turbos.

blade7

But what happens to those missing 2.7 blocks, I bought a complete 2.7 engine for what the head was worth, and most sellers I contacted had scrapped the block or said I could have the rest of the engine free or for peanuts. A plus is the 2.7 block has the right length head studs.