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What rpm on your 912?
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SplitPersonality
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Joined: September 26, 2004
Posts: 630
Location: Norway
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PostPosted: Thu Oct 09, 2014 12:09 am    Post subject: What rpm on your 912? Reply with quote

I have got a 912 engine (105 HP) with a big bore kit on it that is totally redone and runs good and fresh. It is in a VW-based car which is light and small...about 800 kg.

Rancho is building a new 4-speed transmission for this car...and I am wondering:

What rpm do I want to be at when doing 120 kmh / 75-80 mph ?

To all you 912 owners out there: What decent-speed cruising rpm do you run your engines at?

Thanks
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oldbusboy
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PostPosted: Sun Mar 15, 2015 10:11 pm    Post subject: Reply with quote

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malsteph
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PostPosted: Mon Mar 23, 2015 5:22 am    Post subject: Reply with quote

77mph @ 4000 rpm
58mph @ 3000 rpm

That's with a standard Porsche 912 5 speed with 165*80 tyres.
Unless mistaken it is equivalent to a 8x33 from VW.
8x35 is shorter, 8x31 is longer.

A 912 will cruise at 70-75mph all day long. 3500 till 4000 rpm is really the confort zone of this engine. A standard VW has given all it's got by then.
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