blau928

So Greg,

535 RWHP Net should do the trick using a moderate size ...say 235 front tire.... Hmmmmmm..

The 911 that recently went 250 at nardo has about 800 at the crank or 680 RWHP using 15% losses for manual trans... Deduct for the tires etc, and it seems the car should go faster.. Assuming the Cd is the same .34 Hmmmmm

Interesting...

Thanks for the note...!

Lagavulin

I'm sorry, but I haven't read the entire thread, so please forgive me.

Alright. Firstly, a 968 is 50% (..actually 60%) of an 928 S4 in displacement only. However, there is an absolutley HUGE difference between the two: the 968 has siamesed cylinders, whereas the open-deck 928 does not. The 968 is open-deckded too, but at least it's cylinders have some sort of support mechanism where the 928 has NONE. That is HUGE when it comes to cylinder stability, especially at high-horsepower levels.

Chalk one up to the 968 and it's further evolution, versus it's wimpy-cylinder 944/928 breathren.

blau928

Um Paul,

There is a 951 with a stroker 3.0L Crank making the similar HP.... I forgot to mention that one, as well as I was thinking about a 6.0L 928.. I do however see your points... Still, I think that it is possible to prepare an open cylinder motor to extract the 200/liter number... it may take some other "assistance" like O ringing the heads, grouting the block, and tower rings, but still possible..

The info comes from Powerhaus in AZ.. David Raines built several of these...

From their Website...

A pic of the dyno chart is attached.. The TQ curve is interesting on the 2V...

In addition, I qualify "properly prepared".... Some would not have similar standards of prep...

Regards,

Adam C

Ya, your right lag. The 928 is a complete POS and we should all go buy the corvette's you've been peddling in the other thread. Puhhhleeez.

Lagavulin

Richard,

Yes, I'm aware of those engines; very impressive to say the least! But according to the 951 boards, those guys are having a hard time keeping them together.

Regardless, my point is, a stock 968 block is superior to a stock 944/928 one when it comes to a high-horsepower application.

Adam, some of your posts really crack me up! Did I say the 928 is a complete POS? Maybe you should re-read my post. Ah fuh-get about it, you'll probably end up twisting it once again into something it isn't.

Next up, 'Peddling'? Oh 'puhhhleeez', that's funny! Stop it already, will ya?! How 'bout if I say: Pretty-'Puhhhleeez' ?!?!

At least I do speak from the experience of owning both, and am not one to blindly goose-step past the Fuehrer wildly chanting the latest/greatest <insert fav car here> propoganda. Unlike some, I'm not enamored with the name *PORSCHE*; it's just a car to me, as well as the Corvette. I like all cool cars, regardless of make.

By the way, a heads-up just for you: the stock, open-deck 928 block IS a piece of **** for high-horsepower applications.

Fastest928

Actually, that looks like David Chens work ...who used to or still builds all Powerhouse engines.

My audi buddy just popped 515 RWHP with a puny 2.3l

200 bhp per liter 928 engine ..what is the problem? Other than the cost, a peice of cake. This is why I know I can break the 400 km/hr barrier. Anyone care to fund that effort

blau928

Agreed... A siamesed bore is much more suited to this ... Makes you want to go out and buy a new 4.6 Ford block...

I wonder if anyone has tried this.. A 4.6 modular Ford engine in a 928... Wonder if it fits...?

rob rossitto

I remember a similar thread in the 911 turbo forum - all was good till about 750chp, then motor life was measured in HOURS... at 850chp they were getting 30hrs - then the mahle pistons started stress cracking around the wrist pin... pretty wicked 30hrs though!

Lagavulin

Who said there's a problem? It would be relatively easy to do, and just about anyone could do it. However, making it last for an appreciable amount of time is an altogether different issue.

That's true for just about anything...

inactiveuser1228

Guys, Guys, Guys,

You have totally missed the point here and are quibbling about nothing. The horse power wars ended years ago, and good old America iron still rules in that arena. The point is, I purchase a car for only $ 12,000.00 that not only can, but did, keep my *** safe at 170 mph. Then, I used the same car to take my daughters to school the next day. Now that's amazing. That's a PORSCHE. I know there are other cars that can do this, but they cost a lot more that $ 12k, and they're not almost 20 years old.

Steve

Bill51sdr

A-f**king men Steve! Where'd the thread go??? I have a feeling I know about where you made your run, considering where you said you had been. Can't wait to try it myself some early morning, but alas, I'm off racing the next two weekends... darn! You San Diego folks should come check us out at the SCCA National Tour at Qualcomm, March 12 & 13. A few P-cars might even show up! You should see my co-driver!

slate blue

I was chatting with a Porsche engineer and he was privy to the Carrera GT engine development. That engine uses Mahle pistons and they run it at max revs and variations in power outputs, mostly on full power for 100 hrs straight. The engine was then torn down and there was no detectable wear. But this wasn't the first engine they built either. It was the final. They had other engines fall though the dry sump creating too much vacuum and drawing the oil away from the rings and resultant high wear in that area. As you all probably know that Carrera engine produces more than 600 bhp.

As per my other thread, while I respect the 4.6 liter Ford engine, (anybody know what it weighs?) I don't think it has variable valve timing, the Lexus motor does, it weighs less than 200 kgs, the racing version with dry sump and alternator but minus power steer and aircond weighed in at 369 pounds or about 175kgs. These engines also take boost very well. My friends engine will be boosted to 25 psi. That means pretty big power. I think the latest versions of both motors have finger followers too, which is great for lower frictional losses.

I'm sure I could get my car down to 1350 kgs with lightweight interior, no sacrificing of luxeries, and a Lexus motor, make a few parts from carbon and you would be around 1300 kgs. That is lighter than a GT3 and would have 525 hp+ versus the Gt3s 420 hp I believe. I dont believe the extra power provided by the turbos would make the car any faster on the track if it added weight, that is within reason. The Gt2 wasn't really any different to the GT3.

Hope this is interesting

Greg

Lagavulin

Guilty as charged, sir...

Geez, lighten-up already!

Officer, that charge is completely unfounded!

A stock 928 will take relatively forever to reach 170 mph since it's both over-weight and under-powered. Throw a couple more horsies under the hood using one's favorite method (..forced-induction, stroker, or both), and the sprint to 170 mph will occur much much quicker, reducing one's time WAY over the speed-limit, thus minimizing one's chance of getting caught.

Adam C

Lag, FYI I've owned a 1987 Vette (Gold) a 1996 C4 6 speed (midnight blue) a 1988 Turbo cabrio (triple black) a 944 and three 928s.

I submit I've got the ability to comment on the car as well. Sorry if I came across a little brusque, but I trust in the engineers at weissach who came up with the design. **** engine for high horespower? I dunno .What are you calling high horespower? I should be making 450-500 at the wheels fairly soon normally aspirated. That's good enough for me.

IcemanG17

It seems in the high horsepower came there are certain things that always make more power...more valves and cams, turbo or superchargers, a bigger displacement engine or more RPM's. Sure a little 2.0L Mitsubishi turbo can make upwards of 300hp per liter without variable cam timing....the same formula on a 928 turbo motor would be 1500-1950hp....granted engine life is a ?? at that power level, but 200hp/liter (turbo)is very reliable in the same motors...daily driver 100K motors...a 928 TT should be about the same! Look at all the 1000+ whp supras out there....& thats only a 3.0-3.2? liter engine stock...maybe what 4.0 modifired? Still 1000+ whp! It can be done reliably in a 928, it will just cost quite a bit of $$$$$$ My guess $50K?