wrote in message . ..

Not exactly off topic (only half off) ... but I am seeking info on a
1/2 VW and a comparison between a 1/2 VW and a 1/3 Corvair.

Cost ? Weight? Power? And most importantly, fuel consumption.

Opinion follows................................

Cost? Depends on what you can scrounge up. The 110 Hp Corvairs are
getting kind of hard to find. All of us airplane types are buying
them up. But other than a slightly smaller size due to the shorter
stroke there really is nothing wrong with the older ones.

Weight? Based on my comparisons (and I have both sitting here in my
shop) I'd be willing to bet the 13/ Corvair is going to end up just a
bit heavier.

Power? Both the VW and the Corvair are limited in continuos power
output by their waste heat dissipation. 100 Hp Corvair conversions
have proven reliable so you could probably expect a mid 30 Hp 1/3
Corvair to be reliable.

Other differences? There is a greater supply of parts for the VW than
the Corvair, but lots of them are junk. You can still get good VW
parts. You just have to know what to look for.

You can buy a good counterweighted crank for a VW and cut it in half.
You will have to weld your own for the Corvair.

The oil pump housing in the Corvair is cast with the rear case
housing. If the housing on a VW pump gets worn you just replace the
whole thing.

Can't put dual plugs in a VW head due to where they put the
camshaft(at least and have them symmetrical in each head and easy to
service). Dual plugs in a Corvair head is easy.

The Corvair has hydraulic lifters. Good hydraulic lifters for VW's
may not exist.

How many Gal/Hr at minimum power settings? ... say 50% & how many HP
does this represent?

For all practical purposes the 1/2 VW and the 1/3 Corvair will use the
same amount of fuel for the same Hp. Nothing we mere mortals can do
to change this. If you want good fuel efficency for duration records
find a water cooled motor, a Diesel would be best. Look at the Briggs
and Stratton Vanguard 3 cylinder diesel. Made by Diahatsu and can be
had with factory turbo. About the same weight and rated at 30 HP -
continuos.

If you decide on a 1/2 VW check eBay. I should have a fresh set of
heads for sale soon............nice ones, not the welded creations
most have.
=================================
Leon McAtee
Quickie with 1/2 VW - 55% finished

Any response appreciated, thinking of attempting a world record
flight, but need hard info.

Thanks,