FasterThanU90 Posted August 1, 2006 Report Share Posted August 1, 2006 my cub is set up for pump gas and was considering running sum 112 my timing is at +4 how much can i advance it with the 112? Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted August 1, 2006 Report Share Posted August 1, 2006 Same old stuff... What altitude are you at? What size domes do you have? Go do a compression test real quick and tell us what it reads. Without changing domes you could probably bump up to +7 timing and still be safe. I run +9 timing on mine, but I run a special fuel we make ourselves, and I'm at 7500ft so I won't ever have anywhere near the compression someone at lower altitudes would. The fuel we make ends up with an octane rating somewhere between 125 and 135. Quote Link to comment Share on other sites More sharing options...
blueshee03 Posted August 1, 2006 Report Share Posted August 1, 2006 my cub is set up for pump gas and was considering running sum 112 my timing is at +4 how much can i advance it with the 112? +4 should work and you can probally go to +6 on your timing with the 112 Same old stuff... What altitude are you at? What size domes do you have? Go do a compression test real quick and tell us what it reads. Without changing domes you could probably bump up to +7 timing and still be safe. I run +9 timing on mine, but I run a special fuel we make ourselves, and I'm at 7500ft so I won't ever have anywhere near the compression someone at lower altitudes would. The fuel we make ends up with an octane rating somewhere between 125 and 135. if your at 7500 ft why would you run a fuel with an octane rating of 125-135 ?i would think 91 or 93 would be enough. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 1, 2006 Report Share Posted August 1, 2006 If you have no problem running 112 octane, I'd bump that timing up to 8 or 10. Cubs love timing and compression.... Quote Link to comment Share on other sites More sharing options...
FasterThanU90 Posted August 2, 2006 Author Report Share Posted August 2, 2006 "What altitude are you at? What size domes do you have? Go do a compression test real quick and tell us what it reads" Bigred im at sea level to 500ft got 20cc domes wish i had a gauge really need to invest in one should be around 150 or so "If you have no problem running 112 octane, I'd bump that timing up to 8 or 10. Cubs love timing and compression...." i havent ran it yet but it should run just fine with it i just want to kno how much timing i can get away with what size mains are u guys runnin also ? thanks for the replies guys Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 2, 2006 Report Share Posted August 2, 2006 I think I have 150 Mains...but, I have powerjet installed...they're so good, it's like cheating. Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted August 2, 2006 Report Share Posted August 2, 2006 (edited) +4 should work and you can probally go to +6 on your timing with the 112 if your at 7500 ft why would you run a fuel with an octane rating of 125-135 ?i would think 91 or 93 would be enough. I run the higher octane for a couple reasons... Look at how much timing I run, and what size domes I have. I also have some 16cc domes I put in depending on what I'm doing. My compression is high enough I would at least need to run 50/50 at this altitude and since I just about maxed out my timing plate I went ahead and run the higher stuff we make. We make our own fuel. Its a mix of a bunch of different things, the combination actually makes the higher octane rating, its not like I'm going out buying something that high, its just a side-factor to the "manufacturing" process we use and some of the ingredients. Edited August 2, 2006 by BigRed350x Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 2, 2006 Report Share Posted August 2, 2006 I run the higher octane for a couple reasons... Look at how much timing I run, and what size domes I have. I also have some 16cc domes I put in depending on what I'm doing. My compression is high enough I would at least need to run 50/50 at this altitude and since I just about maxed out my timing plate I went ahead and run the higher stuff we make. We make our own fuel. Its a mix of a bunch of different things, the combination actually makes the higher octane rating, its not like I'm going out buying something that high, its just a side-factor to the "manufacturing" process we use and some of the ingredients. Shit red...if you maxed out a Ricky Stator timing plate, it's more like 12 degrees!!! Quote Link to comment Share on other sites More sharing options...
FasterThanU90 Posted August 2, 2006 Author Report Share Posted August 2, 2006 ....so 7 degrees advance? Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 2, 2006 Report Share Posted August 2, 2006 You can go 7 or 8 all day long. I'm closer to 12 or 14 between my timing plate and my Dyna...but, the Dyna tapers off as the R's rise. Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted August 2, 2006 Report Share Posted August 2, 2006 Shit red...if you maxed out a Ricky Stator timing plate, it's more like 12 degrees!!! Almost maxed out... lol Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted August 2, 2006 Report Share Posted August 2, 2006 10-12 on a cub :baseball_w00t: DAMN................. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted August 3, 2006 Report Share Posted August 3, 2006 Yeah, they LOVE timing. once I get to dyno...I'll tell you all what I end up with... Quote Link to comment Share on other sites More sharing options...
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