Hi,
Sorry but my English is not that good..
Are you talking about the power of a ? VW and cooling problems?
If you are looking for a 4-stroke engine you may take this equation to start with.
8,5 HP for every 1000cc and every 1000 rpm.
Or in US units : 14 HP for every 100 cubic inch and every 1000 rpm
So your engine needs to be a 100 cubic inch @2500 rpm for 35 HP
Let??s take a Lycoming 320 as an example:
320 cubic inch @ 2700 rpm
320/70 makes 45,7 HP@1000 rpm or 123 HP @ 2700 rpm
Lycoming announces 150 to 160 HP for this engine witch is a very good.
The only way to build significant stronger engines is using a sort of forced in-take system like a turbo or a roots-blower.
Today??s best normal aspirated 4-strokes will deliver 24,6 HP/ 100 cubic inch/1000rpm.
These are engine-performance figures you find on the Yamaha R6, not immediately in range
. (123HP@13000rpm)
Regards Johan