Re: TR6 Compression

["Mark J. Bradakis" <mjb@autox.team.net>]

Here's a chart I think I posted a few years back.  Some of these are
my measurements, some taken from the first editions of Kas' competition
guides.  The table gives the compression ratio, overall thickness of the
head and combustion chamber depth and volumes for various heads. 


Engine            C/R    thickness       combustion chamber
                                         depth       volume
GT6 Mk I          9.50                                      
GT6+              9.25       3.450       0.425         34   
GT6 Mk III        9.25       3.32         .47          37   
(early)                                                     
GT6 Mk III        8.0        3.40         .55          44   
(late)                                                      
TR250, TR6        8.5        3.55         .60          48.5 
TR6 middle        7.75       3.54         .68          55   
TR6 late          7.5        3.55         .70          57
TR6 race 1       10.25       3.375        .52          41.6 
TR6 race 2       12.3        3.295        .44          33   
GT6 race 1       10.75       3.31         .385         30   
GT6 race 2       12.75       3.22         .300         24.4



mjb.