Do I need race gas ?

pepperson4

pepperson4

Location
IL/WIS border
-Motor specs: 752cc
-Rad billet 5 mill crank
-62t cases with work done
-61x cylinder ported by Riva
-Riva girdled two peice head
-81mm pistons
-190 psi compression
-Zero flywheel w/ring and face drilled
-Boyesen intake with speed plate
-New Boyesen rad valves
-X-scream mod 46's with ATP billet plates
-62T e-box with msd enhancer

I forgot what the squish is off the top of my head but I can measure later. Wondering if it would be safe to run pump gas in this setup .
 
cookn

cookn

Kamikaze
Location
where you live
Timing and squish are a big factor in what gas you should be running and not so much the rest of the things you have listed. Alot of timing advance and tighter squish demand it, but I would say you are alright on pump gas considering you are under 200psi and running an enhancer
 
catpower

catpower

Location
iowa
Illinois/Wisconsin border. I'm betting you only have 91 octane for pump gas? If your lucky and it's not blended with ethanol. That term drives me nuts. What is pump gas? For some it's 93. Pump gas dispensed from a commercially operated supplier to the masses.
 
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john zigler

john zigler

Vendor Account
Location
wisconsin
Only 93 here has ethanol. Stick with pure gas. (NO ethanol) which is 91.

IMO you are pushing the edge, and would not be a bad idea to mix Race/Pump gas.

If you do run straight pump gas, keep a CLOSE eye on your piston tops for signs of detonation.

Squish clearance would help.
 
jonolove

jonolove

Location
oakland
Look at the piston through the exhaust port if there is excessive wear right where the port and piston match you have detonation occurring if you don't have signs of detonation your fine I run a 38 degree advance 200 psi pure 110 w klotz
 
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