jimboq8

I have only been racing for a year or so now out here in Kuwait and its quite competitive, I have heard many different things about percentages of fuel from many people, with so many conflicting reports which is best, I race the mugen mbx5r with the jp 5 eagle and a navarossi 9853 pipe, at the moment I am running on maxi's 30% car fuel. can any one help at all? cheers.

Barber420

My Feedback: (1)

I've always been told that whatever kind of fuel (brand and percentage) that you break an engine in on is what you should run for the life of that engine. Top Fuel seems to only really perform well in Traxxas, and I'm not a big fan of Blue Thunder(or Nitro Sport), but I like O'Donnel fuels. I've also seen NitroTane work well.

calvino

traxxas, blue thunder... those are real high oil so expect to replace bearings left and right (bad). I run sidewinder 20% race in my truggy and it works good, a higher nitro content will offer more speeds but higher engine temps and less life, oooh and its alot more expensive as well. If the fuel your using works good, stick with it, if your a little skeptcial, try something else, its worth a shot, in US dollars about how much is a gallon of fuel over there?

HJJFFFAA

I use Maxy's 20% and it cost me 30 dollars last time I bought it in October.

ASSOCIATED_DRIVER

I have only used few brands, XTM racing fuel, Traxxas Top fuel, and HPI monster fuel, and O'Donnel's.

Among the fuels I've tried, I would say O'Donnel's works well.

Dawman

My Feedback: (33)

If your happy with Maxy`s then run that as it is a good fuel .

dragon2k2

How good is nitrotane?

dragon2k2

How good is nitrotane?

jimboq8

maxy's 30% is about 10kd which is 37 dollars.

python661

I think that if you have the knowladge to replace parts, and the cash then 30% is what you want...............BUT you shouldn't notice a world of difference on 20-25%

python661

Also you may want to consider how serious you are taking it. Higher nitro content is for more serious racers.

rcguy1411

i live in canada my lhs now carries a canadian blend 20% nitro cant rember the name but the oil is like 8% havent had a prob they clame that with the less oil the less friction and cooler temps i have seen the cooler temps about 20 -25 deg but i am tending to run a little richer you now the safe side is this possible i haveing a hard time wrapping my head around this one i have popped a os .18 cvr using this fuel but at the same thim i was ringing the snott out of it first one ive pooped in like 20 years guess thats not bad can any one confirm this myht hate to loose anotheer engine to bad fuel

Sugafree

I use 30% Nitro with 8% Oil..... (I find it Runs Cooler and Holds a Better Tune than the 20% nitro with higher Oil content .....And as far as the 30% shortens Engine life is BS...... IMO I've got 10 to 12 gallons on my last 5 or 6 Engines all running 30% from the 1st start)




Car Fuel Facts

If you read the R/C car magazines, engine instruction manuals or talk to local racers, you'll likely find conflicting information about car fuels. The main controversy seems to focus on how much and what type of oil is needed for a car fuel.

Here the straight scoop based on over 15 years of experience that includes working closely with engine manufactures, industry experts, top-level racers and the results of testing literally hundreds of formulas in all types of car engines and conditions.

Why Not Airplane Fuel

Car engines operate in a totally different environment than do airplane engines. Airplane engines spend a great deal of their running life at full rpm, they have a constant airflow from the prop to aid in cooling and instant throttle response and acceleration is not as critical as with a car engine.

Car engines spend most of their life accelerating from one corner to the next and are seldom at full RPM for more than a few seconds. They rely on an oversize heat sink head to dissipate combustion heat and racers actually tune car engines based on throttle response.

Fuel designed for airplanes typically have from 15 to 20% oil. While the manufactures that truly understand the requirements of car engines typically put 8 to 12% oil in their car fuel.

Why 8% to 12% Oil

Using high oil content fuels (above 15%) in gas car engines won't provide improved engine life, as some would expect. Through extensive testing we've discovered the point of diminishing return as far as oil content to engine life is actually around 8% for most car engines. In other words any more oil than 8% in the fuel does noting to improve the life of a car engine. In fact the secondary effects of high oil content fuels can actually cause engine damage by encouraging over lean runs. Here's how.

Using high oil content fuel causes a car engine to be unresponsive during acceleration acting as if the engine were running rich. Typically when using high oil content fuel, in order to get crisp acceleration and response, an engine will need to be adjusted overly lean. In addition the high oil content prevents lean bog when an engine is over-leaned thus allowing the engine to run at this lean setting without the customary telltale lean bog warning letting you know the engine is overheating.

In summary, high oil content fuels don't give added protection. The point of diminishing return from a protection standpoint in a gas car application is about 8% oil depending on the oil type and engine. Anymore oil than this doesn't offer added protection and has potential secondary effects that reduce performance and can actually cause you to over lean your engine in an attempt to get crisp throttle response and acceleration. Do yourself a favor and follow these two rules:

Rule #1- Always use a high quality fresh fuel designed specifically for gas car use that has between 8% and 12% oil preferably with at least some castor in it. (We recommend Blue Thunder Sport or Race Formula)

Rule #2 - Don't use airplane fuels or any other type of fuels that have over 15% oil in your gas car engine.

rcguy1411

thanks that is the fuel that i have now i belive that my new hpi .21bb say to use like 12 % oil will this void the warinty if somthing fail ie bearing as i feel confident in my tunning abilities i meen i trust the guys at my lhs they have always been there to help me i the only reason i killed my os .18 was iwas chasing after my buddys 21 and was killing him on the top end he didnt like that lol untill it went pop what a mess

jimboq8

Thanks sugar free thats exactly what I needed, Ill now look for something out here that will fit. Also that problem with higher oil contents and the engine running like it is rich is another problem im having anyway thanks for that.