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Increase Horsepower for 1967 Porsche 912

I have a 1967 912, with the straight 1,600 CC engine and the normal ~90 HP. I AM NOT a mechanic, but would like to increase the horsepower power by 10-15 percent without major modifications.

I have been told that by adding a new exhaust and setting up the carbs, I can add another 10-plus horsepower.

Any thoughts from this rogues gallery, would be appreciated.

Doug

Old 07-03-2020, 06:07 AM
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Big bore kit , mild cam !

Last edited by Prsh356; 07-06-2020 at 05:47 AM..
Old 07-04-2020, 05:21 AM
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Ask yourself if it is really worth the cost and effort if the present configuration is running well. Find someone who has installed the larger P & C, drive their car and see if it is worth it to you. If you are facing a complete rebuild for some other reason, my answer might be different, but if all is presently good, I'd leave well enough alone. A complete tune up by a reputable shop would be a lot less expensive than the improvements you are asking about and might well surprise you with the results.
Old 07-05-2020, 05:34 AM
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ptrsbtrs
 
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Agreed^^^ !!
to add to the sense of wonderment when driving the car (any car)
all you have to do is WASH IT.
Old 07-06-2020, 05:50 AM
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Where do you live. Maybe someone can refer a good shop near by. 10 hp might be a reach, If you gain 10 hp on the top end it will more than likely come at the expense of low and mid range torque.
Beyond a new exhaust things will get expensive quickly. Hopefully all you need is a proper tune. These cars when stock are about handling and momentum,
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Old 07-07-2020, 05:44 AM
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External to the engine, probably add exhaust headers, Weber carbs (40 IDF) and velocity stacks, MSD ignition. Certainly add header wrap on the headers, since that can boost performance as well. MSD can add mid-range torque, which equates to performance. Internally, add a big bore piston kit, erratic camshaft, etc.
Old 07-10-2020, 10:03 AM
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I’m in the same boat. If you have some money I would
go with a big bore kit. Mild cam, and an exhaust. Weber’s or
Delorto and ignition setup. You could be looking at a 25-30 hp
gain. Since you have to split the case, for cam make sure everything
looks good. Boattailing the crank will get you 5-10 hp.

Old 07-23-2020, 09:46 PM
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