Re: Snapey's 1935 Racing Biposto

Posted by Rusty O\'Toole On 2011/6/26 9:43:03

If you want to go crazy let's go crazy. How about an F head cylinder head to fit your block. Use both existing valves for intakes. Cast an aluminum head with 1 big exhaust valve or 2 small ones if you prefer a 4 valve setup.

The rule is the exhaust valve should be 80% the size of the intakes so you will probably need to use 2 in order to keep them small and light enough for fast action, and to avoid burning.

Run the exhaust out the far side and there you are with your 4 valve crossflow engine.

The head would need to be OHC.

This would be crazy difficult and expensive for a 1 off but not as bad as it used to be. With today's CAD CAM , lost foam casting and other advanced techniques it is not as expensive to go from concept to castings.

In the end you might get max HP up to practically the same as a stock OHV V8 of the fifties of similar size.