[kach22i]

Originally Posted by widebody911

Where did you get that number?

I based it on the later and higher powered 356's which are just tweaked VW's anyway, sort of.

Originally Posted by wdfifteen

A 912 only makes a little over 100 hp,

Right, 4 cylinders X 25 hp ea. = 100 HP total.

Same for a 911 engine more or less, 6 x 25 = 150 hp, similar to as early 2.7's

I did this simplified math for the reason of trying to figure out exhaust muffling, breaking it down per pipe.

Later 911's might be +30 HP per cylinder, early VW's only 10-20 hp.

That's quite a range, but like I said it was for gauging straight through muffler exhaust lengths.
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EDIT:

Not the same engine, but interesting.


220 Hp Radial Engine Powered VW Beetle
http://americaloveshorsepower.com/radial-engine-powered-volkswagen-bug/

Built by Continental, the W670-9A engine is rated at 220 horsepower. The engine was used in a variety of applications, and this 1941 model was pulled from an M2 tank. Bore is 5.125 inches with a 4.625-inch stroke, giving the engine total displacement of 668ci. - See more at: http://americaloveshorsepower.com/radial-engine-powered-volkswagen-bug/#sthash.buL80rjL.dpuf

Article on the engine which opened this thread:
http://www.enginelabs.com/news/homegrown-horsepower-radial-engine-constructed-from-vw-parts/

This estimate seems pretty low:
http://jalopnik.com/amazing-loon-built-a-radial-engine-from-vw-parts-1608661285

It seems to be a pretty compact power plant, and if I had to guess I'd say it may make between 80-100 HP? Maybe?