Just picked up an 07 phazer with an mpi supercharger and the website says 50/50 mix of premium and 110 race fuel. Could 110 AV fuel be used instead? I heard that AV fuel is drier But that shouldn't matter as much with a 4 stroke. I live very close to a small airport so the AV fuel would be easy to obtain. Any advice would be appreciated. (I'm only running 10 pounds of boost)
AV fuel or race fuel??
- Thread starter bachey
- Start date
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pylon
Well-known member
ive used 100 LL im my turbo nytro for 5000 km at 17 #s with no issues at all for 2 seasons now . i did pull my oil tank off to get powder coated and noticed a bunch of grey crap around the intake screen . I think its lead thats worked its way past the rings and into the oil over the last couple years .
B
BCAlpinejunkie
Member
Ditto.
17lb MCX Apex.
Nothing but 100LL .
100LL is 105 octane.
Lead acts as a lubricant, boosts octane.
Keep a spare o2 sensor, just in case.
17lb MCX Apex.
Nothing but 100LL .
100LL is 105 octane.
Lead acts as a lubricant, boosts octane.
Keep a spare o2 sensor, just in case.
I run 100ll av with a little klotz upper cyl lubricant with no troubles.
i had a MPI apex on 10 pounds of boost. yeah they say run 50/50. its really not needed at 10 pounds, even at stock compression. i ran my apex three seasons on 10 pounds with nothin but pump fuel. at 7000+ feet in the deepest of snow i must add. but if you want to be extra safe i would just throw in a gallon of race fuel
P.S. i never did take the engine out of my sled for any reason, headshim or repares
P.S. i never did take the engine out of my sled for any reason, headshim or repares
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johnny be bad
Well-known member
just run a little 2 stroke oil in the gas, thats what i was told to do. seems to work fine.
B
BCAlpinejunkie
Member
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Do not mix race or av gas for the little Phazer---they need all the help they can get to stay together under boost. Straight Av would be my way--I have run my TRX on it for 3 seasons with up to 18 pounds of boost 2 head-gaskets all else stock.
Our dealer is just rebuilding a supercharged Phazer and over the last few seasons everyone with a turbo Phazer did blow up--so be careful and do not crank up the boost. Good luck.
Our dealer is just rebuilding a supercharged Phazer and over the last few seasons everyone with a turbo Phazer did blow up--so be careful and do not crank up the boost. Good luck.
yeah ^^^ the phazers DONT like boost quite the same as the other yami motors, if you push the limits of your octane that thing will die a quick death.
but 100ll would be perfect for what your doing, and running 200:1 or 250:1 something like that mixed 2 stroke oil in the gas it seems to help a little, helps engine life.. at least it seems like it and its cheap insurance.
but 100ll would be perfect for what your doing, and running 200:1 or 250:1 something like that mixed 2 stroke oil in the gas it seems to help a little, helps engine life.. at least it seems like it and its cheap insurance.
T
tranquillicer
Well-known member
Phazer
My understanding of octane in all boosted sleds is that a higher level prevents or reduces the threat of detonation which would eventually cause failure of rods or brg. cap bolts. Is the problem with the Phazer engine failures a result of detonation or simply that they are not really able to handle the stress of doubling the hp output?
I was told by a turbo builder that he personally would never turbo a Phazer or build a system for one because they are not a good engine for boost. That being the case, I definitely would not cut corners on the fuel and would go easy on the boost. Guess the SC does not allow for control over boost level right. Bet thats a fun sled with 150hp though.
My understanding of octane in all boosted sleds is that a higher level prevents or reduces the threat of detonation which would eventually cause failure of rods or brg. cap bolts. Is the problem with the Phazer engine failures a result of detonation or simply that they are not really able to handle the stress of doubling the hp output?
I was told by a turbo builder that he personally would never turbo a Phazer or build a system for one because they are not a good engine for boost. That being the case, I definitely would not cut corners on the fuel and would go easy on the boost. Guess the SC does not allow for control over boost level right. Bet thats a fun sled with 150hp though.
100ll
I've been running 100LL up to 18lbs. The only concern I have with LL is it's very dry. I'm starting to think it's hard on seals, valve seats and carbing up the valves, not sure if adding some 2 stroke oil will help. Maybe c16 and supreme pump gas mixed 50/50 is a better choice.
I've been running 100LL up to 18lbs. The only concern I have with LL is it's very dry. I'm starting to think it's hard on seals, valve seats and carbing up the valves, not sure if adding some 2 stroke oil will help. Maybe c16 and supreme pump gas mixed 50/50 is a better choice.
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ikold
Member
100ll
100LL is specifically designed to a. stay dry (keep water out of the fuel) b. prevent detonation at altitude. Its a great lower cost fuel when compared to race gas plus its actual octane number is like 104-107.
Should work well with boosted motors. The 114 should be even better but not necessary unless running large boost numbers.
100LL is specifically designed to a. stay dry (keep water out of the fuel) b. prevent detonation at altitude. Its a great lower cost fuel when compared to race gas plus its actual octane number is like 104-107.
Should work well with boosted motors. The 114 should be even better but not necessary unless running large boost numbers.
I put 3000 km's on my phazer before i sold it last year, the motor was still going strong with 17 lbs of boost for the last 1000km's i rode it. had two intercoolers on it and ran straight pump gas(94 octane) with a head shim and timing control box. they are a blast but it seems like the phazer falls apart alot. (bushings and shocks)
Guess I'm the unlucky one on this thread. I ran straight 100LL at 10psi on an s/c Vector and ended up with 50% leakdown in all 3 holes in 300 miles. It was always rdden above 9,000 feet & the AFR's were good. I also had an s/c & water temp guage so I know it didn't get hot.
I had a reputable shop do the work & they blamed it on the av gas.
I had a reputable shop do the work & they blamed it on the av gas.
15 psi on avgas with 10:1 compression has been working for me.
M
modsledr
Well-known member
Just curious what you/they mean when they "blamed it on the av gas"?
What was being blamed on the av gas? What was the damage? Signs of detonation?
thx.
