Need 2.7l 8 valve head with s2 3.0l block turbo info.

stylelab · 10-26-2006, 09:04 PM

Hi,

Here is my story. I have owned my S2 for almost a year now. I have also owned an 86 turbo for 3 months. This morning I stumbled across a great deal on a 2.7l 8 valve head and picked it up. I kind of did this blindly without really having read what needs to be done. What I did know is that the 2.7l 8 valve head is the only head that will match up to my S2 block without modification. This head will also not require having a custom exhaust manifold fabricated or exhaust or any other custom plumbing for that matter. I could use stock 951 plumbing, exhaust, manifolds and stock 951 exhaust valves. Where things get a tad hazy is pistons, engine/fuel management, stand-alones, engine harness, injectors, turbo choice etc... I may be in over my head, but I am pretty resourceful and do have access to a great tuning shop at decent rates. I can also do some of the more basic work myself. I will be selling my turbo and S2 head to cover the costs of this modification so I do have an initial cushion for funding. Any info. and I mean any would be greatly appreciated. Advice as well as comments would also be appreciated. Thanks for your time.

-Nick

ae1969 · 09:32 PM

You already have a 3L engine............. go and boost that.

....and since you dont actually need that 2.7 L head.... I wouldnt mind buying it.

.... and that 60-2 engine is perfect for Megasquirt............. but if you have the bolt on parts from a 2.5 turbo then go ahead and use that 2.7 head.

JivenJim · 10-27-2006, 02:46 PM

I'm a little confused. If you got a Turbo 2.5L why would you sell the Turbo car to turbo your S2. And I have know idea why you would want the 2.7 head. (That's a 944S non-turbo right?)
Turbo Valves are Sodium filled, and I think the Turbo has bigger exhaust while your S2 has Bigger Intake. Not sure on that thoe. Also the Turbo Head is specially designed to handle the extra heat.
If your goal is a 3.0L Turbo You'd start with a 3.0 L short block, and insert 104mm 8.5 CR Piston. Would require aftermarket Pauter or Carrillo Connecting rods to handle the Power. Machine work to notch the upper Crank Cradle for Conn Rod bolt clearance. I would think some custom exhaust for Cross over and waste gate. Stronger clutch and flywheel, Electronic management like a tech3 or Motec.

If I had 10K$ to drop in to a project like that I'd go 3.0 short block into a 944Turbo/S Car, use the rebuilt Turbo 8V head, Racing Springs, Un-obtainum Retainers, and Re-worked CAM.
This guys site is a must for you cause that's what he's doing. http://www.fastest944turbo.com/
I think he's using http://www.944enhancement.com/html/engine_building.html which explains the engine building very well.

The All mighty Clark of http://www.clarks-garage.com/ under engine modification has some great stuff on all of this as well. (cause he's done it)

If you got Say 20K$ you could Turbo A 968 http://www.powerhaus.com/944t.htm

So I'd sell the 2.7 head to Ae1969. Sell the whole s2 Car. Sell your Turbo Short Block, Buy a 3.0 Short Block and S2 Stage III+ Clutch assembly and Bell housing. Use the 944turbo as the super car. I'd think something like 3.5 to 4" exhaust but might be able to use a piggy back Fuel air controller (not have to replace Turbo wiring) but then if you drop that much in to a project why short your self.

Did we mention it's really expen$ive.

Many ask such but few would dare.

stylelab · 10-27-2006, 04:24 PM

the S2 has a 3.0 liter block. The 2.7 liter 8-valve head is the only one that will fit this block without modification. A 951 head does not fit on a 3.0 liter block without modification to the water jackets. All 951 turbo parts will fit onto this 2.7 liter head, I'm talking exhaust manifold here and so on. Therefore I will avoid a lot of custom work which I would have to do with my 16 valve S2 head. The biggest problem I have right now is finding pistons to lower compression and what sort of engine management I will be going with.

ae1969 · 10-27-2006, 04:42 PM

Quote:

Originally posted by stylelab
......... The biggest problem I have right now is finding pistons to lower compression and what sort of engine management I will be going with.

Finding pistons is definitely the holy grail.

Not a cheap endeavour.......but a great project ...Good luck.

If you want to unload the S2 or 2.7 head.... let us know.

stylelab · 10-27-2006, 08:53 PM

sure I have to unload one head or the other... Thanks for your support

JivenJim · 10-30-2006, 06:56 AM

I wouldn't think that the 100$ or so in machining would be much a factor for mating a turbo head to 3.0 block. Having springs, CAMs, Valves and Ceramic lined head of the 8V Turbo Head is worth having in my opinion.

3.0 L Turbo Pistons needing no block modification. Uses standard 968 piston rings.
http://www.lindseyracing.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=LR&Product_Code=LR-PS1040-008&Category_Code=944PISTONPISTONS

Maybe talk with these guys and search posts for Tech 3 and other electronic management systems.
http://www.vitesseracing.com/html/engine_management.html

Good luck

stylelab · 10-30-2006, 07:49 AM

thanks Jim, those are the pistons I'm looking for. I wonder if going custom JE would be more cost-effective? If I'm not mistaken, I think I can get more flow out of the 2.7 liter head over the 2.5 liter. Later and better flowing intake and exhaust ports. 16 valve head would have even more flow! I'll look into your suggestions, thanks for your time.

-Nick

JivenJim · 10-30-2006, 08:08 AM

JE Pistons require the Block to be Sleeved. Metal Compatibility. I'd spend the extra and go with those I linked. Or you could drop $1800 for Overbore to 3.2L-3.4 then sleeve. Sleeved would work with JE Pistons. But then, Custom Rings and Gasket.

Lindsey can Port and Flow /re-work the head and can offer some good advise there.