Hi! Lynn What kind of modifications (porting ect.) was done to get 229.4hp @ 7800RPM. Length of exhaust & intake runners. Thanks. Georges B. Christavia Mk 4 13bNA (dry sump)

That is a Daryl Drummond built (originally) now Hanover built "J" Bridgeport 84 asymmetrical rotors (just because they are the lightest) nearly stock runner diameters (just a good looking cleanup) A short runner manifold for a Weber 48 IDA with 38 MM chokes.

 

Headers are exactly equal length primaries 1 7/8" ID 22" to a collector 5" long to a 2 1/2" ID to a megaphone 24" long up to 4" OD into a muffler (All 4") and out through the passenger door. Racing bearings. External dry sump (Moroso) pump.  Running about 105 pounds at speed. About 82 pounds at idle (2,000) RPM. Timed at 27 degrees on both leading and trailing. Carbon apex seals.

 

One engine gets new side seals each year and becomes the race engine. The out engine becomes the spare. No wear on anything else. 1 oz. of redline 2 cycle oil per gallon of any 87 octane unleaded regular with no alcohol. We never need the spare, but we have two in any case.

 

Lynn E. Hanover