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Workshop => Engine and Bottom End => Topic started by: tingley596 on April 21, 2015, 09:57:18 PM

Title: Race gas or no?
Post by: tingley596 on April 21, 2015, 09:57:18 PM

68.5mm short rod and 20cc cool head, Cylinder is ported by sand trix. Does it need race gas?

Title: Race gas or no?
Post by: Grande huevos on April 21, 2015, 10:14:41 PM

In my opinion and experience you should always use race fuel with a 2 stroke...
Other people are going to tell you to do a compression test to determine rather you need to run it or not

Title: Race gas or no?
Post by: tingley596 on April 21, 2015, 11:41:21 PM

Figured some engine guru could chime in with that info and say pump 50/50 or 110

Title: Race gas or no?
Post by: Jerry Hall on April 22, 2015, 12:42:23 AM

Quote from: tingley596;53488

68.5mm short rod and 20cc cool head, Cylinder is ported by sand trix. Does it need race gas?

Rod length, a 68.5mm bore, 20cc dome, and who it is ported by does not really give us the type of information we need to advise you on what type of fuel you need to run.

What is the piston to head clearance. What is the volume in the combustion chamber when the piston is at TDC.  Show us a drawing of the combustion chamber.   Show us a port map.  Tell us what pipe and silencer you have and what the stinger inside diameter is,  then we can advise you on the fuel to run.

Title: Race gas or no?
Post by: tingley596 on April 22, 2015, 01:56:00 AM

yea way to endepth I'll just run race gas. Not going to tear my cylinder back off to take pictures for just switching to a different head.

Title: Race gas or no?
Post by: rbiron2 on May 01, 2015, 10:43:15 AM

Do a UCCR test. There not too difficult and that will give enough information.

Title: Race gas or no?
Post by: Rupp250 on May 01, 2015, 01:19:12 PM

No point in running race gas if you don't have too. It gets expensive fast. Plus you may be loseing power as well.