jns

Buick Grand National. I'm aiming more for throttle response/less turbo lag, reliability and good fuel economy. The hp potential is enormous, though, especially since turbos are involved.

Russ Murphy

So vs. the 951 motor the AAN Audi has a steel block, closed deck, better harmonics and one additional main bearing. Sounds pretty damn stout.

turbo_porscha

does anyone know which forumand thread did this 5cyl turbo in 944 project originally from? anyone have more pictures on 5cyl engine in 944 project ?

HD911

Audi 20 valve motors are NOT sideplug heads as you stated, the 8 valve 5 motors were but not the 20 valves.

Plus as mentioned here the Audi motor is stronger, has 12 more valve, one more cylinder and one more main bearing!

How can you claim the 951 is a better powerplant than a the Audi motor??

Take a look.

A.Wayne

I was comparing apples , the side plug audi head vs side plug 951 head, Porsche head flows more . Audi 20 v head vs Porsche 968 head, porsche head flows more .. both engines are strong the audi engine has a steel bottom end , the porsche does not , i like both engines , i would not say the audi engine is better and with a target goal of 1000 bhp a lot of work would have to be done to both to make and hold that....

Tms951

Right, but 951s did not come with the 16v. We are talking about replacing the stock engine with the 20v turbo engine. But in talkng about the 16v are you saying it flows more per cylinder, because if so then the 5cyl. could still flow more overall. Face it the 5cyl. is the best of the bunch, especialy per liter.

Think about it Scott gomes got 1076 fwhp out of a 3.0l 16v, and Dahlback got 1200fwhp out of a 2.2L 20v 5cyl. and it took alot less to get that power out of the 5cyl.

A.Wayne

I'm not familiar with scott's work , so i cannot comment on his setup, but i have never seen any proof of dahlback making 1200 whp out of his 5 cylinder power plant, i don't believe that car makes anywhere near that power. The porsche head in stock form flows better than the audi head , the extra cylinder don't account for much if you can counter that with displacement . a 2.5 L 5 cylinder engine has it's issues also one being the fact that the engine hangs out further, so for a track car it would be a step backwards, not sure about the weight difference as porsches builds heavier lugs than anyone else.
I have also seen 2.1 L 4 cylinder engines make 1100whp on meth and 2.5 do 1350 also on meth. these where off the chain very custom engines but we digress as i was comparing stock for stock or mildly built engines, i don't see a 20v audi engine being an improvement over a 16 V Porsche engine, most here shoot for 400 whp , that is academic for a 951, no need for an engine swap.

Kit_Chris

Would an extra cylinder fit in there? Hmm S54..

Regards,
Chris

HD911

This thread was about the Audi 20V versus the 951 8V, its pretty clear that the Audi powerplant is better in every aspect than the Porsche mill.

RPHARRIS

When you consider the three important variables of cost, reliability, and horsepower, I think the swap makes a lot of sense.

Tms951

I have 400whp a very long power band and an extremely reliable engine for the power. It cost stupid money and in hind sight I would much rather have the 20v 5cyl. with half the work and the same power.

I keep telling myself that at least I can go racing with PCA if I want, but with the new rules I can't even do that and be competitive.

A.Wayne

Hmmm, i had thought it was about engine swaps , if you are going to swap out the 951 , 8V , i would have gone the 16 v route and kept it a porsche or if not put a twin turbo v8 in the bitch for 2000 bhp and call it a day , not a piddly 2.2, 5 cylinder lump...

HD911

No it started as a thread about a guy who put a "piddly 2.2L 5 cylinder lump" in a 951.

A Wayne its pretty obvious you don't have much respect for the Audi motor and thats fine but it was a hell of a motor for its day and still being used and highly modified 20 years later.

IIRC Dahlback de-strokes his motors to 1.9L for his 1000+BHP motors and they rev to over 9000 RPM.......sure sounds like a piddly lump to me

RPHARRIS

That's a good point. ...If you're gonna swap, you might as well go huge. Maybe the class he's racing in has a displacement rule.

would you like a solid axle with that twin turbo v-8?

This thread inspired me to finally pull the trigger on something I had been thinking about for quite a while. Check out my thread if you want to know more:
https://rennlist.com/forums/944-turbo-and-turbo-s-forum/408824-hmmm-was-this-a-good-idea.html

Tms951

Kept it porsche? You obviously have never taken much of your car apart. I have and almost every part of it is stamped vw/audi. My friend took the steering wheel and door handles and put them on to his VW pick up with no modifications. The only difference in aperance of parts is that the ones off my car had porsche logos. (but VW/Audi production stampings)

The 20v engine is actualy more apropiate for this car since the 951 is much more of an Audi than a Porsche. If you don't like audi stuff much you should sell your Audi, I mean "Porsche" 951.

The 8v engine is the mosty authenticly Porsche (or only), and worst part of these cars. Oh wait except for the balance shafts, thank you mitisubishi for making these engines possible.