20v Blacktop engine advice needed

[speedmaster]

Current set up;

82mm 11.1 pistons
Toda-R 264/272 9.0mm
Custom valve springs
0.5mm metal head gasket

the rest would almost be standard.

I plan to change to CP Pistons 82mm 12.1 CR. Would i get a big difference from the current 11.1 CR? And also what RON rating must i run with? Is the head gasket safe to run 12.1 CR?

Thank you for the advice.

[onnaj]

With that pistons and a 0.5 headgasket i guess you're getting close to the 13:1 mark. With a 0.8 TRD headgasket on a bone stock BT you'll already achieve 11,5:1! Don't know about the pistons hitting the valves with such a thin gasket. But other people over here will tell you soon

For octane i think you need racing fuel or at least 100RON.

[speedmaster]

With that pistons and a 0.5 headgasket i guess you're getting close to the 13:1 mark. With a 0.8 TRD headgasket on a bone stock BT you'll already achieve 11,5:1! Don't know about the pistons hitting the valves with such a thin gasket. But other people over here will tell you soon

For octane i think you need racing fuel or at least 100RON.

hi bro. do you mean the CP pistons?

[speedmaster]

BTW, is it advisable to replace the intake cam pulley to the adjustable type? Im running Adaptronic and will only be used in 1/4 race.

[gaijin_rokurunner]

Wont do much increasing compression u need higher lift cams to work hand in hand with that also better valves to take advantage of the cams...hit me up i can help u setup your engine! PM me or email me nuffsaid02@aol.com

[speedmaster]

tq bro

[onnaj]

With that pistons and a 0.5 headgasket i guess you're getting close to the 13:1 mark. With a 0.8 TRD headgasket on a bone stock BT you'll already achieve 11,5:1! Don't know about the pistons hitting the valves with such a thin gasket. But other people over here will tell you soon

For octane i think you need racing fuel or at least 100RON.

hi bro. do you mean the CP pistons?

Yes i mean in combination with that pistons yes!