Mike J

Any idea of the price point you guys are aiming for?

As a point of reference, a new Turbo fan from Sunset is $330.

Cheers,

Mike

Steve Weiner-Rennsport Systems

Not yet. These are not inexpensive to make so I think will be well beyond that price point. Considering durability & longevity (not to mention performance improvements), this will be a better long-term alternative.

Remember, a 993TT fan will not work in the 993 NA fan housing; you need the housing as well to do that.

OverBoosted28

DELETED: Asked & answered

Mike J

I thought the fans were the same diameter between the NA and Turbo's and were interchangeable, and the difference in the shrouds were just because the Turbo needs the mounting spots for the IC. I did not know you cannot interchange the fans. Never compared them side by side, so good to know ...

ppashley

Subscribed.

Seamless

Yes the turbo fans are significantly smaller in diameter.

Coleman

Subscribed..

Ed Hughes

Well, what was a boring wet Sunday afternoon, just got interesting!

ppashley

Any update on this interesting project... Steve?

pp000830

I seem to recall the fans on Vintage Porsche racecars were plastic. I suspect the metal fan has to do with service life as a metal fan can last the life of the car and in racing it need only last the life of the race. I too have heard about fatigue failures of the fan. I suspect the root cause of these failures has more to do with fan contact to the housing due to a misalignment or a failing bearing. Manufacturers go to great lengths to test performance and service life of components. I am sure if the engineers could get long life out of plastic it would have been implemented as a quality/cost out project long before the 993. The fact that the fan is made of magnesium not zinc pot metal or other lower cost heavier metal casting suggests that Porsche engineers focused on this part quite a bit to keep the weight down.

Ed Hughes

I'm pretty sure Porsche wasn't worried about fans last 20+ years.

Steve Weiner-Rennsport Systems

Actually, they are GRP and its pretty durable. I've had the original fans on the 907, 908, 917 and 935 cars hold up very well and I've not required replacements since I started in 1974.

Its simply FAR FAR more expensive to manufacture than a pressure casting.

Steve Weiner-Rennsport Systems

Yep, but they sure did.

KMASS993

Maybe you should consider using stainless magnesium... Cutting edge!

pp000830

Uses three HP?? Seeing that the fan is spun up to speed when the car is running the use of HP is related to the pumping action of the fan not the acceleration of its mass to operating speed. Maybe we could gain three horsepower simply by removing the fan entirely? Then again the air intake tract would probably heat the air the engine uses quite a bit reducing combustion efficiency and output by a lot more than three horsepower! Then again 3 HP is just a guess in the first place according to the OP.