ESR head domes? what do the numbers mean

[TheLadiesMan]

i was wondering if anyone had a key to show what numbers on the domes went with what octane?


im looking for the last 2 numbers that will allow me to run 93 oct. i guess its supose to be a 25cc dome.


right now im running a 66

i have a 55 but im not sure what gas that is for, can anyone tell me

thanks
Lance

[trailwart]

what size bore do you have, i have a 33cc for a 330 that im not using and i want to get between a 25-28cc for my 330 right now im using a 30cc

[honda350r]

The #s are the width of the squish,the higher the # the less squish, which will give less bottom end and more top end.

So your 55 will make more bottom end than the 66 .

The first #s equal the size of the bore .

Hope that helps .

[TheLadiesMan]

thanks for the replys

im running a 330 cylinder with a +4mm crank

im looking for a dome that i can run 93 oct with.

when i got these domes from ESR like 2 years ago they did say one was for more topend and the other for bottom end, so it makes a little more sence now.

anyone else wiht more info

[trailwart]

whats your compression right now, call esr and find out the cc your dome is , you want an esr dome for pump gas i have one, im lookin for somthin in the 25-28cc range, might be intested in trading let me know

[400EX QUADER]

i read then my number and they wouldn't tell me the cc.... just tell me if it's for topend or bottomend.

[86 Quad R]

Originally posted by TheLadiesMan
thanks for the replys

im running a 330 cylinder with a +4mm crank

im looking for a dome that i can run 93 oct with.

when i got these domes from ESR like 2 years ago they did say one was for more topend and the other for bottom end, so it makes a little more sence now.

anyone else wiht more info


with the advancement in todays technology. i'd take the smaller dome and send it to someone that can reshape it around the octane and riding style that your wanting.

this technique essentially allows for the coolest temp at the engines peak power rpm and delivers optimum power delivery.

if you want further info or contact information, pm me.

[TheLadiesMan]

this is what i got from ESR when i e mailed them



The last #’s 55 and 66 are the squish band length, 55 being for more low end and the 66 is for more top end. There should also be a P or R at the end P=pump gas R= Race gas.

[honda350r]

Originally posted by TheLadiesMan
this is what i got from ESR when i e mailed them

The last #’s 55 and 66 are the squish band length, 55 being for more low end and the 66 is for more top end. There should also be a P or R at the end P=pump gas R= Race gas.



Hmmm? Looks familiar?

[TheLadiesMan]

Originally posted by honda350r
The last #’s 55 and 66 are the squish band length, 55 being for more low end and the 66 is for more top end. There should also be a P or R at the end P=pump gas R= Race gas.



Hmmm? Looks familiar?

you the man!!!

anyone got any 330 domes for pump gas?