fuel issues

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Old 08-18-2009, 08:42 AM
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i'm new 2 off road r/c so i believed the crap the salesman told me during his sales pitch. he sold me fuel that was 20% nitro with only 9% lubrication & said this would be fine 4 buggies. well 1 crank, 1 piston head & 1 cylinder wall later i found out off someone who knows what they're talking about that the lack of lubrication caused the engine 2 overheat thus ceasing the engine. well the problem i have is this... someone else told me 2 add some castor oil 2 the fuel, so i went out & got some motorcross racing castor oil & brought the lubrication content up 2 about 15%. now i find that it makes the car run crap (that's when i can even get it started). it seems 2 me that the oil is overpowering the nitro & not combusting. so what i did was go & get the correct fuel & used that instead & the engine started no trouble at all. my question is this... what is the ideal fuel mix to run in a .28 engine? i have a lot of this dodgy fuel left so is their anyway of fixing the fuel? can it damage the engine? i have seen buggy fuel with up to 18% lube so i thought that mixing the other up to 15% lube would've worked o.k. what do u guys think?
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Old 08-18-2009, 08:50 AM
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i think the most likely culprit would be your tuning skills and not the fuel.
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Old 08-18-2009, 08:50 AM
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9% oil is fine. I dont recommend changing the fuel by adding your own castor. There are to many good fuels out there to have to do any home additions.
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Old 08-18-2009, 08:55 AM
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Originally Posted by fatdaddy View Post
i think the most likely culprit would be your tuning skills and not the fuel.
+1 get a more experienced tuner in your area to lend a hand...
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Old 08-18-2009, 09:26 AM
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the problem is i live in rural australia so the nearest hobby shop is 200km away so i'm having 2 work all it out myself. there is no-one else around 2 help so i'm relying on u guys. so far so good.
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Old 08-18-2009, 09:30 AM
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a good read for you would be the tuning bible that is stickyed at the top of the thread list.

what temp was your motor running at before you added the extra oil to the fuel?
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Old 08-18-2009, 09:35 AM
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not 2 sure what the temperature was but using the tried & true spit test it wasn't sizzling on the cylinder head so i think the temp. was in an acceptable range. what temp. should they be running @? i did notice a lot of carbon on top of the piston when it ceased suggesting it was 2 lean but i think this was due 2 a faulty fuel tank that had a crack in the pick-up forcing to much air thus running it lean. lucky the warranty sorted the engine out eh. but the techo's said that the fuel was'nt rich enough in lube & told me 2 add castor oil 2 it.
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