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Best fuel for FRV engines?? Empty

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Best fuel for FRV engines?? Empty Best fuel for FRV engines??

Post  rsv1cox Thu Mar 05, 2015 9:32 am

Best fuel for FRV engines?? P-38%20and%20more%20002_zpsjazsajg9

I have read that perhaps lower nitro content fuels may be best for the Wen's and other non reed engines. I have used the 20% fuel in a couple of my Cox reedies with mixed results, so I bought the 25% Cox fuel but haven't tried it yet, looking to find the new 35% Cox fuel soon.

It occured to me that I have never ran a Wen/Ok Cub/Testors FRV engine before - ever... Embarassed . so im' wondering which would be my better choice between the two for that application?
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Post  Mark Boesen Thu Mar 05, 2015 10:17 am

I don't think 20% to 25% nitro will make a big difference, anything in that ballpark should be good. I think the oil is more critical in the Wen-Mac and Cubs dues to the poorer tolerances of piston/cylinder. The oil percent, mostly caster should be in the mid twenties.
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Post  TDbandit Thu Mar 05, 2015 10:28 am

I've run my testors/McCoy rotor valve 049 engines on the Cox fuel the old and new with no problems. I would be careful with that Sidewinder fuel though. That looks to be Pro-10 car which is low oil and is mostly synthetic if I'm not mistaken. It's ok in Ball Bearing ABC engines but Cox and other Reed and Rotor valve plain bearing engines might not live too long. (Bandit)

Mark beat me to the punch anyway as he said and I agree the nitro is not the problem, it's the oil content.
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Post  chevyiron420 Thu Mar 05, 2015 12:25 pm

I use backyard basher fuel by Morgan 20% nitro. Morgan say's it 16% oil, mostly castor. I add castor to bring the oil up to 20%. I run my Cox, Wen's, Ok, all on it and they love it. I also add methanol and castor to it to make 10%-26% for my fox and mccoy 35's, and they love it too.
Phil
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Post  TDbandit Thu Mar 05, 2015 12:31 pm

@chevyiron420 wrote:I use backyard basher fuel by Morgan 20% nitro. Morgan say's it 16% oil, mostly castor. I add castor to bring the oil up to 20%. I run my Cox, Wen's, Ok, all on it and they love it. I also add methanol and castor to it to make 10%-26% for my fox and mccoy 35's, and they love it too.
Phil
"Nods" yup you can do that in fact if you use the race fuel you can add even more castor to it. Smile
BTW Phil you heading to SMS? (Southeastern Model Show) this weekend? its in perry ga?
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Post  chevyiron420 Thu Mar 05, 2015 4:57 pm

@TDbandit wrote:
@chevyiron420 wrote:I use backyard basher fuel by Morgan 20% nitro. Morgan say's it 16% oil, mostly castor. I add castor to bring the oil up to 20%. I run my Cox, Wen's, Ok, all on it and they love it. I also add methanol and castor to it to make 10%-26% for my fox and mccoy 35's, and they love it too.
Phil
"Nods" yup you can do that in fact if you use the race fuel you can add even more castor to it. Smile
BTW Phil you heading to SMS? (Southeastern Model Show) this weekend? its in perry ga?
No Bandit, I got like 20 days to get my vintage karts ready for the winter nationals at Barnesville. I dont think I'm gonna make it.
Phil
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Post  TDbandit Thu Mar 05, 2015 8:13 pm

@chevyiron420 wrote:
@TDbandit wrote:
@chevyiron420 wrote:I use backyard basher fuel by Morgan 20% nitro. Morgan say's it 16% oil, mostly castor. I add castor to bring the oil up to 20%. I run my Cox, Wen's, Ok, all on it and they love it. I also add methanol and castor to it to make 10%-26% for my fox and mccoy 35's, and they love it too.
Phil
"Nods" yup you can do that in fact if you use the race fuel you can add even more castor to it. Smile
BTW Phil you heading to SMS? (Southeastern Model Show) this weekend? its in perry ga?
No Bandit, I got like 20 days to get my vintage karts ready for the winter nationals at Barnesville. I dont think I'm gonna make it.
Phil
You run Karts? (Bandit)
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Post  chevyiron420 Thu Mar 05, 2015 8:36 pm

Only vintage, and my son drives, I'm not well enough anymore.
Best fuel for FRV engines?? Img_0010
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Post  TDbandit Thu Mar 05, 2015 9:15 pm

@chevyiron420 wrote:Only vintage, and my son drives, I'm not well enough anymore.
Best fuel for FRV engines?? Img_0010
Nice McCullough motor? I've run Karts before, lotsa fun. Smile  (Bandit)


Last edited by TDbandit on Thu Mar 05, 2015 9:53 pm; edited 2 times in total
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Post  RknRusty Thu Mar 05, 2015 9:50 pm

@rsv1cox wrote: I bought the 25% Cox fuel but haven't tried it yet, looking to find the new 35% Cox fuel soon.
Tower sells the same Super Power fuel in 25 and 35% nitro formula.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXEYHA&P=0
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Post  stuntflyr Tue Mar 10, 2015 2:31 pm

I had a Mac on my old Kart. I cannot remember the frame brand. SoCal, lots of fun.
Chris...
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Post  RknRusty Tue Mar 10, 2015 2:59 pm

That's a tight looking little green machine.
I remember when they had carts at the State Fair, that was my first taste of racing, and also when I found out I was a good driver. My first time out, I either didn't know what the red flag meant or else I was snoozing on it while bringing up the rear at WOT. By the time I saw all the motionless carts clogging the lane, I picked a narrow gap and flew through a wide eyed pack of other kids, still in their carts, with only a loud tick as both sides of my front bumper made contact with two of their rear bumpers, then skidded to a stop. After a collective sigh of relief, about three other kids came up to me and patted me on the back, saying, "Good driving, man." That was the beginning of my wild chain of driving events that lasted until I had my first and only child. Gotta have that ice water... and I don't mean in the cooling can Lol. Looking back on it, it's sort of horrifying, some of the stuff I survived without a scratch.
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