Paul, What RPM do you plan to run that engine at for 'cruise'?? The prop
will be 1/2 that, I understand. Does the surface drive have more 'slip'

than a non-cavitating prop? And how much does that change the RPM
calculations??

I have OSCO manifolds on the 350 GM I'm running and they've been fine,
and a decent price. Wish they had one for the Rabbit/Golf diesels!
Although there is an British supplier... I built welded copper manifolds

years ago, but had trouble keeping flanges intact. They were real
effective cooling the exhaust, with a .062 copper wall, though. Maybe
I'll think about doing that for a VW Diesel. I think I'd start with a
1/2" steel plate bolted to the block as a 'manifold starter plate' and
braze the copper pipes to that. I have to look at the VW geometry. Maybe

I can pick up a blown engine to play with and measure before making any
committments :-)

Thanks for all the info; I'll be waiting to hear about your launch!

In article SD83c.210320$jk2.722631@attbi_s53, you say...
I am using a standard GM marine bellhousing and shaft coupler mounted to a
manual transmission flywheel. Attached to that is a volvo transmission to
give me a 2:1 reduction and forword-nuetral-reverse gears. I had a constant
velolcity joint made from 2 universal joints that connects between the trans
and drive to take up the engine vibration and slight angle change.The
exhaust manifolds were right out of the OSCO catalog and I am having custom
risers made to connect them to the turbo.

My prop is 17X18" so I may need to get it recupped after I see how it
performs.

--
Regards, Terry King ...In The Woods In Vermont

The one who Dies With The Most Parts LOSES!! What do you need?