MAGK944

Sleeve the block and fit a stroked 3.0 crank to get you to around 3.2, fit some HC pistons, better cam, better engine management, 48mm intake valves, flow intake & head and that 2.5 8v head should net you over 250.

Van

Yes, 275 hp is easily attained in an NA engine if you add a turbo or super charger. But it's not going to happen with an NA engine alone unless you spin it up to 10k RPM. Oh, and you're probably going to have to spend $100k plus.


Mike and I are usually in agreement, but not this time... A 968 engine makes 235 hp - that's a 3 liter, 16-valve, variocam engine - and still it's 15 hp shy of the 250 mark. If you want 250 at the wheels, you need 300 fwhp... There are S2 and 968 engines making that (looking towards Michael Mount), but these are sky-is-the-limit-for-budget builds.


It's easy to spend $10k building an engine that's still a 2.5 (legal for 944 cup racing) and only get 145 whp - which would be about 175 hp at the crank.

If costs rise exponentially for this kind of performance, I can only imagine what it would take to get another 100 hp.

MAGK944

idk, I think the 968 leaves a lot on the table. An extra 200cc, bump that compression up to 12:1, a decent engine management with sequential direct ignition like Electomotive. Extrude hone the intake, flow the 2.5 head with larger intake valves, imo it would be quite close.

Yes the 968 head flows better, but we are not aiming for 350+ hp engine here, just the best surroundings to make max hp out of a 2.5na head.

Still quite a pointless excersize, building an engine around the limitations of the cylinder head, just a bit of tech fun! You are basically trying to build a big air pump around an air restrictor.

Noahs944

I love the idea of a fire breathing 4 popper. I think Milledge make 230 hp (fw I assume) outta the 2.5... but that's probably $25000+ us.

Thanks for the responses. Please continue to add! I'll just read & learn.

Since my original enquiry I have decided to (after the fall autox season)
-get turbo valve springs.
-port & polish
-47mm intake valves
-MAF
-fabricate ram air duct

Also with the head off, will measure. Considering shaving the head more & fly cutting the pistons, but knock is already a concern (with 10.2:1 !!!).

Per vers

Here is the result off a couple of days in the workshop.

My car is a -82 944 n/a. Engine from -88. Euro spec.
Portet head. (Home made)
Balance shaft delete.
280* DBilas camshaft.
Turbo valve springs.
Tommibillets cam adj.
Dansk Rear tail pipe.
Stil on original DME and MAF. (Megasquirt comming soon)

Dyno result before: 97 kw. (132 hk) on Wheels at 6000 rpm.
Dyno result after: 117 kw. (159 hk) on weehls at 6200 rpm.
At 2000 rpm. + 5 kw.
At 3000 rpm. + 7 kw.
At 4000 rpm. +10 kw.
At 5000 rpm. + 14 kw.

Regards Per

H.F.B.

On a 968, a simple airbox mod resulted in dyno proven 10 hp. Just have look at the attached pdf..

H.F.B.

and here is another good example that shows what's possible with the knowledge and technology of the 21st century
944 S2 280 bhp upgrade (click below)
https://rennlist.com/forums/944-and-...l#post12169976

Noahs944

Conversion chart: http://www.rapidtables.com/convert/power/kw-to-hp.htm
Before: 130 HP/After: 159 HP at wheels. Big improvements for that old Porsche!
HUGE THANKS Per for providing real dyno stats. So the '88 is about 162 HP normally (when new) so we lose 30 HP through the drive train in these cars. Good to know!

Arominus

You'll still get more just by bolting a 944S head onto your motor or finding an S motor, it flows considerably better than even a ported 8v head and is a bolt on. You just need a set of S pistons and an S or S2 intake/header and your off. 188HP to start with and 10.9:1 Compression. My 944S with 170k miles on it put down 160hp to the wheels (corrected for altitude). It gained 10hp with the MAF/tune i was testing at the time.

Noahs944

YES. The S engine has alot of appeal & I looked into this after driving my friend's S. It was so smooth! I only got little 100 mm bores though brother.

Per vers

I to would like an S.
But her in Denmark, they are wery rare, and expensive. Spareparts are also wery hart to come by.
8 valves are allover the place. Only problem is high milage.

Regards Per

Voith

Head, pistons and intake + work and you are on $5k easy. You can buy complete S car for 5k.

Arominus

The S uses the standard 2.5 block, exactly the same as what you have. Same bores!

Voith is right though, buying an S might even be a better option, i sold mine for 5k.

Noahs944

Arominus,

I just spent the last hour searching the net to try & prove you wrong. I stand corrected! You are right!! That's great news bud.

mattipuh

We got 196hp (engine) with no work to the head expect different camshaft.