fastcrash

Please take part in this poll. I have listed the most popular fuel grades. Also if you can give your expertise: What kind of mods can be done to these engines to give them more pep? (besides pipes) Can you raise the compression? adjust timing? larger carb? also do these engines use the same ported sleve as nitro or are there valves to play with? Thanx to all replies. Chris

SBGasser

yes on all except teh sleve and valves, neither of each. you can run from a stock 23cc to a fully modified and raceported reed caged 30.5 motor.

i try to use 93/94 octane fuels. other sue 103 - 110 Racing fuel too.
anything over 14:1 compression generally isnt good unless your going to be running alcohol for fuel.
hth
T

fastcrash

I was just reading the post about brian somebody whos waiting for a 30.5. How much is he paying for that engine, and what fuel will be best to run in something like that? I am more interested in onroad, such as the evo-4 Would this be a good engine for that or a smaller higher reving engine. I have about 12 yrs experience with nitro, but got bored and sold everything. Just looking for something different.

bigger the better

Your poll will be incorrect depending on who is voting; this is due to the octane rating difference between the US and other country's. The US is lower in the octane # then others. I believe it’s due to the US using MINIMUM ratings instead of actual, same fuel just different numbering system.
I use 90-92 NON-ETH fuels, I feel the motor would probably run just as well on 87 but prefer to use a NON-ETH fuel due to water separation.

teamchrome

My Feedback: (4)

No pump gas for mine, I use Coleman camp fuel.

34Ford

My Feedback: (2)

Coleman camp fuel.

kengentry5000

My Feedback: (2)

US equivalent octane rating (R + M)/2 is lower than the way the EU computes octane. So if someone in Europe says they run 95 octane it is equivalent to 89 - 90 octane in the US.

I have also run Coleman camp fuel with great results. I'm about ready to 'cook up' another gallon.

Acs_guitars

My Feedback: (3)

I too have been a user of camp fuel... works great, and in these engines you don't need the high octane when they are stock. I have upgraded to a cylinder reed and now run 93 octane. The highest I will ever run is what ever the top grade at the pump is, be it 91 or 93... Those who use race fuels are throwing money away IMO as that alone makes no performance increase.

SBGasser

that motor Brian is waiting for runs 400 and is worth every penny. 87 - 93 would work great. with the modifications done, the compression ratio is down to a reasonable 14:1 to 15:1 from the 18:1 it was originally at. you can get this perticular motor only at DDM or one of their affiiiates.
SBG

fastcrash

How many ppl are building their own engine from various performance parts available online? Are the prebuilt engines tuned down? Or are ppl wasting their time to come up with their own combination of parts. And also, how are these hp numbers calculated? Are the hp ratings just a best guess, or is there good evidence to back these claims?

SELWA

My Feedback: (1)

I'm thinking about trying the coleman fuel idea. I have some in the basement or garage I think. Do you still mix it the same ratio with oil? What are the benifits besides smell? Is there more than one Coleman fuel? I assume it the same one used for the stoves

teamchrome

My Feedback: (4)

Mix it the same, its all camp fuel.
I have used Colman and Walmart brand fuel.
I run a 32:1 to a 36:1 ratio with Amsoil Dominator.
Other than the smell... no benny that I know of, and its about $5 or $6 a galllon. But we all know how long a gallon lasts.
I dont know how many gallons Ive run, but I know it has been at least 4, if not 6 and still running strong.
I have ran it in a stock 23cc, 29cc stroker, and a 27cc.

Werloc

Since the 80's, I've always used 100+ octane in my 1/4 and now my 1/5 scale gassers.