Enhanced Compression
SCCA allows the 325 to run C/R as high as 12/1 in E Production. The M20 currently sports a somewhat thicker MLS head gasket and has a calculated 11/1 C/R. If I want to be competitive in E/P I'll need to get back to 12/1 as I'm probably losing 20 h/p as presently configured.
The M20 as a race engine seems pretty durable, once the rocker issues are sorted. The car's previous owner helped VAC develop their " Unbreakable" aluminum rockers and so far I've had no failures. His experience was such that he put a hole in the firewall and could change a broken rocker in 20 minutes.
My issues to date have had more to do with transmission and clutch in that the Getrag box needs a fluid venting system that allows the lube to go a catch tank and return once it's cooled rather than blown out the various seals onto the bottom of the car. The 5.5 inch twin disc clutch allows fast shifts but isn't particularly user friendly. It's engaged or it's not, no slipping allowed. So forget driving the car onto the trailer or driving slowly around the paddock area.
SCCA allows the 325 to run C/R as high as 12/1 in E Production. The M20 currently sports a somewhat thicker MLS head gasket and has a calculated 11/1 C/R. If I want to be competitive in E/P I'll need to get back to 12/1 as I'm probably losing 20 h/p as presently configured.
The M20 as a race engine seems pretty durable, once the rocker issues are sorted. The car's previous owner helped VAC develop their " Unbreakable" aluminum rockers and so far I've had no failures. His experience was such that he put a hole in the firewall and could change a broken rocker in 20 minutes.
My issues to date have had more to do with transmission and clutch in that the Getrag box needs a fluid venting system that allows the lube to go a catch tank and return once it's cooled rather than blown out the various seals onto the bottom of the car. The 5.5 inch twin disc clutch allows fast shifts but isn't particularly user friendly. It's engaged or it's not, no slipping allowed. So forget driving the car onto the trailer or driving slowly around the paddock area.
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