High comp skimmed cylinder head 9:5 TS 225

[al pushpak]

Hi just wondering is a 9:5 skimmed cylinder head a bad idea on Ts1 now that modern fuels have more ethanol content & also with impending change from E5 to E10 fuel due in towards the end of the year? thanks for any info. Cheers

[Warkton Tornado No.1]

IMO that is a good, safe geometric CR for now & I would wait & see before making changes. That ball park with the optimum squish, Super unleaded & about 19° BTDC is the current set-up on an extensively re-worked TS I did.

1.0 mm squish in this case, DT250 piston re-pegged, 60 mm stroke.

[al pushpak]

Thanks for your reply, I would be fitting it to a standard 225 ts & std piston, no tuning , just a 3mm packing plate as its running an rd 110 rodded crank, timing is going to be set at either 17 or 18 degrees. Cheers

[hullygully]

if you're that worried bud go for a HComp Mammouth AF's head (or Avanti, other heeds are available ) makes your piston coolio

[al pushpak]

Cheers