Author Topic: 110 Octane racing fuel  (Read 9726 times)

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Offline cycloneracer

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Re: 110 Octane racing fuel
« Reply #15 on: September 29, 2014, 08:34:03 pm »
Nut holding on flywheel or bolt? 


If bolt it is going to break anyway so run cheap gas
Paul Krueger

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Offline stvn_VA

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Re: 110 Octane racing fuel
« Reply #16 on: September 29, 2014, 08:37:18 pm »
Dang it!!  It's a bolt
Steven
Southern Thunder Racing
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Offline cycloneracer

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Re: 110 Octane racing fuel
« Reply #17 on: September 29, 2014, 08:40:54 pm »
Be sure to set the timing with a timing light.   And set it soft if you want it to live.

I'd never run that crank in an OHV.  I've seen the ARC billet crank snap in those with too much timing. 

Keep the RPM's under 5800.
Paul Krueger

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Offline TeamMurray

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Re: 110 Octane racing fuel
« Reply #18 on: September 29, 2014, 08:43:14 pm »
The higher the compression, the more of a risk of pre-detonation running lower octane.  This is what causes broken cranks.  Premature detonation.  There are no benefits to running high octane in lower compression engines.  The higher octane fuels are designed to keep spontaneous combustion from occurring.
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Offline cycloneracer

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Re: 110 Octane racing fuel
« Reply #19 on: September 29, 2014, 08:44:58 pm »
The higher the compression, the more of a risk of pre-detonation running lower octane.  This is what causes broken cranks.  Premature detonation.  There are no benefits to running high octane in lower compression engines.  The higher octane fuels are designed to keep spontaneous combustion from occurring.


That is what I'm saying. 


Got to finish to win!
Paul Krueger

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Offline stvn_VA

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Re: 110 Octane racing fuel
« Reply #20 on: September 29, 2014, 08:50:28 pm »
Thanks MurrDawg.   That makes sense.   All responses have been a very good help to me even if I just found out I've got a bum crank. 
Steven
Southern Thunder Racing
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Offline TeamMurray

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Re: 110 Octane racing fuel
« Reply #21 on: September 29, 2014, 08:52:08 pm »
I agree with what Paul is saying.  Just trying to explain what's going on inside of the engine.  I run a very well built 31 OHV and all I run is regular 89 octane pump fuel.  All I have ever ran is a B&S nut style crank.  I agree that timing is the most important thing to look at.
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Offline stvn_VA

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Re: 110 Octane racing fuel
« Reply #22 on: September 29, 2014, 08:56:09 pm »
Running third mark in hub.   Never put the light in this engine just using past experience. 
Steven
Southern Thunder Racing
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Offline TeamMurray

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Re: 110 Octane racing fuel
« Reply #23 on: September 29, 2014, 09:06:55 pm »
From experience, never trust the timing marks.  I've had  B&S cranks be off on timing.  Always put a light on it.  Also, what flywheel hub are you using?  AVS or Non-AVS?  Definite difference in timing.
Jason Murray
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Offline stvn_VA

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Re: 110 Octane racing fuel
« Reply #24 on: September 29, 2014, 09:08:44 pm »
#6611H AVS
Steven
Southern Thunder Racing
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Offline TeamMurray

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Re: 110 Octane racing fuel
« Reply #25 on: September 29, 2014, 09:15:11 pm »
That's the correct hub.
Jason Murray
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Offline cycloneracer

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Re: 110 Octane racing fuel
« Reply #26 on: September 29, 2014, 09:15:37 pm »
Use a light.  

But I don't know what to set it at.  Set it low enough to make it live and it will be sluggish.   Set it high to be fast and the crank will break.  

Seems like the block and pan may be part of the crank breaking issues.   If it an old worn out engine they seem to flex.  

Keep your RPM's down and you will be fine.   Don's cams are torque cams and don't like to be spun sky high anyway.  

 
Paul Krueger

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Offline TeamMurray

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Re: 110 Octane racing fuel
« Reply #27 on: September 29, 2014, 09:23:39 pm »
Timing is the major key to keeping the crank in one piece.  Like Paul said, use a degree wheel.  Never exceed 30 degrees. 
Jason Murray
Murray Racing Team
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Offline leman

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Re: 110 Octane racing fuel
« Reply #28 on: September 29, 2014, 09:51:16 pm »
If you ever have the piston out, check the edge of the piston with a magnifying glass.  If it looks pitted like it was sand blasted, you are having some detonation and should go up in octane.  Just something to keep an eye out for
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Offline stvn_VA

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Re: 110 Octane racing fuel
« Reply #29 on: October 01, 2014, 12:49:26 pm »
I heard from Don today.  He said..... "Ratio on that motor is a little over 10:1  which is all I like to go".  So from all the info I've gathered from you guys out there and knowing I have the bolt style crank in a 31OHV and only running 10:1 ratio not 11:1 plus.  It appears they are real no benefits running 110 octane.   Then on the other hand will it hurt?  I have 2 gallon sitting in the shed already. 
Steven
Southern Thunder Racing
Abingdon, VA

There are three kinds of men;
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 3.) The rest of them have to pee on the electric fence for themselves.