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JoeMag's Avatar
 
Join Date: Jul 2005
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Max hp from 993 heads?

...anyone know max hp you can get with 993 heads?

Old 09-14-2020, 01:47 PM
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Stock ones?? or ?????

I did 300 Wheel Hp with them, but the engine was not stock.... I'm guessing with a turbo they will do waaaaaay more.
Old 09-14-2020, 02:47 PM
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The question shouldn't really be how much power can you get from 993 heads. It should how long will they last at the heat and stress levels of a high output engine.

You can get 110 HP per liter with 993 heads. They will last longer than 964 heads because they use a better aluminum alloy. But, they are still going to crack eventually.
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Old 09-14-2020, 02:56 PM
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head life

Yes,the head life is the RR factor.Ciao Fred
Old 09-14-2020, 03:21 PM
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RR Factor

RR is ROLLSROYCE.
Old 09-14-2020, 04:37 PM
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... talkn stock heads w 50mm intake and 43.5mm exh valves. 400+ hp seems high. Best I’ve seen w 993 rs heads was a Roth sport slide valve one at around 420 crank (not sure if other head work done)
Old 09-15-2020, 05:49 AM
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We were lucky to get 30 race hours out of 4 different 964 sets over 3 years time, north of 400 hp, we have 150 hrs on the Xtreme castings and no problems
Mik Bruns
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Old 09-16-2020, 03:48 PM
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Quote:
Originally Posted by MBruns View Post
We were lucky to get 30 race hours out of 4 different 964 sets over 3 years time, north of 400 hp, we have 150 hrs on the Xtreme castings and no problems
Mik Bruns
This is exactly why I went with Xtreme heads for my race engine build. Expensive....but I am saving money in the long run.

Ok, the improved performance and heat handling abilities were important factors too......

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Last edited by winders; 09-16-2020 at 04:58 PM..
Old 09-16-2020, 04:53 PM
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