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There are a great many reasons why you DO NOT want to over work engines .If the VW could do the figures you quote, then trust me, it would have been done years ago. the original Se5a used a high torque engine with a big slow turning prop. A VW producing sufficient horsepower to drag even a 7/8 Se would be "toothpick thrashing" ie; a very small prop turning very,very fast.Much of your prop would be masked by the fuselage reducing effective thrust even more so.To give you an idea of the sort of plane designed to use a VW check out the volksplane or corby starlet. Add another draggy wing ,wires ,messy undercarriage ,and so forth then you soon get the picture as to how well your machine will perform. Have a look at books by Richard Finch for some good ideas of how to use car motors, you would be surprised at what can be done!
It would be an awful shame to write off your machine or blow a piston through the fuselage etc by using a powerplant that is not up to the challenge. The VW is not a racing engine .
As a point in case , at a nearby field a 7/8 nieuport 17 was built using a Subaru motor.Turning a small prop very fast,fairly low Hp,big cowl,lots of drag etc the first circuit was done in ground effect the WHOLE way around and the second ended upside down about 50m past rotation point. messy, expensive ,and a waste of 15 years.
Im not saying dont do it, if you want to go for it then Ok , BUT ,like my old man says
" a crappy engine is like the airspace above you, useless"
"the throttle can only go so far forward"
"your sphincter can only keep you in the air until its eaten the seat cushion"
28,000+ thousand hours of 747s boiled down to 3 sentances....
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