Timing plate Question

[Sandfrk33]

Do I need to run 100+ octane to get the full benefits of advancing the timing? I am running a hemi head with 21 domes, v-force reeds, cylinders are bored to 65 mil, and it was ported. Thanks

[Snopczynski]

Probably not. Just need 50/50 if you need any higher octane at all. 21cc with a raised exhaust port will probably put you around 145-155 psi.

[98_shee]

You should be ok on pump gas with your timing set at +4.

 

Welcome to the HQ :beer:

[05.Banshee.SE]

You should be ok on pump gas with your timing set at +4.

 

Welcome to the HQ :beer:

 

x2.

 

If you want to run a higher octane fuel, you can raise your compression by getting smaller domes. (Lower number means higher compression...go to the NOSS Machine site, they have a chart for Dome Sizes vs. Elevation, and what the compression outcome is.)

 

0-160 PSI = 93

160+ = Race fuel

 

(To be safe you might want to cut off at 155 psi)

 

Any detonation requires a bump up in octane, or a lowering of your compression.

 

Definately think about the cost though. For me, it's not worth it and I'll stay on pump fuel.