RB V12: What % nitro?
 

I just bought a V12 along with some 30% Byrons which was recommended by my LHS. The manual from RB indicates a maximum of 20%, do I need to shim the head, run a different Turbo plug?

How much power is 30% really worth and does durability really suffer? The RB manual indicates accelerated aging with higher nitro.

On my humble opinion, unless you are runing on a open outlaw 200mm racing category and want the ultimate power, its not worth the 30% nitro fuel ...

You might use some good brand 16% nitro racing fuel ... not more ... thats all you need, the rest its on your hands on the TX and on the setup.

cya !

Since we are in the same region this might help. I ran my Rody V12 at toledo this weekend and ran a .1 and .3 shim, #6plug and 30% odonnell. It ran like a raped ape. Last week I only ran it with a .1 shim and it was better for sure with more shims. On RB's website it says the .12 are setup for 16% and to add .1 for every 5% you go up on the nitro. Or you can just stay with 16% but I have never tried it.

Paul

i have an V12 as well and use 30% and whatever shims were on there (if any). Does anyone know the shim size that is from the factory?

Ok....here's the deal.....the part numbers for the shims are..p/n 1700-020...

I'm running the std v12......non turbo.....1 shim added...Sidewinder 30% world championship formula(which has ALOT to do with how well the engine runs and tunes)

this motor is WAY faster than my OS turbo even dreamed of being.......Second gear on my r40 comes on like an afterburner........

Go RB!!! GO Sidewinder!!

I would strongly recommend using 30%, if you know how to tune the eng, wear on the eng due to higher nitro content will not make much difference. Also, you can always find someone to resize the sleeve. There seems to be more benefits to 30% when compared to 20%.

mine is the turbo version, just removed the head and found one silver shim on it. Not sure of the size but my question is by adding another shim, will i increase power or take it away. I know that by having less shims the compression goes up, but where do i find my medium?

Thanks for all the great advice!!! Since this is my first nitro, after 1 year of electrics, I think I'll run the remainder of this season with 20%. If I am little slow, I will make the switch to 30% next year, since it seems tuning becomes more critical with 30%.

A couple other questions:
1) Do you have to repeat the entire run-in procedure when switching to another %?
2) How can you determine if a shim is necessary, do you just try it?

Actually it seems easier to tune with the higher percentage of nitro ....

there is a big power difference between 16% and 30% i have a OSTR that i run 30% fuel and that motor has 2 1/2 gallons of fuel through it and still has alot of compression, and it runs around 245 degrees. It all depends how well you tune your motor just like fastharry stated a few post above^^

no you donot need to do run in procedure

to determine how many shims you have to check and see how your glow plug looks like after every run

is my v12 a turbo??? because it came with a regular glow plug and on the box it says "1700-000410" and it says "RB V12 3T/SA/BN/SPT/TIR"

so how can it be a turbo if it doesn't use a turbo glow plug?

thats a standard, my turbo is 1700-000430

fudge:mad: :flaming:

i specifacally asked for a 3 port turbo, what am I suppose to do now? is it cheaper to exchange it and get a turbo version or how can i convert it to a turbo?

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