Nitro MCX 18#'s on av gas (100LL)

[Sleds R Fun]

So I'm hearing lots of talk on Nitro's needing some motor work with any amount of boost.So what do you guys think?
I have a MCX stage 2 with head shim and run 18#'s of boost on av gas @ 3000-5000ft. Am I sitting on a ticking time bomb?? Sled has 1400 miles boosted right now.

 

[yamiman]

Boost calculator asks for 97.5 octane at 3000' using 18 psi. I would say your within margin.

 

[ortyn]

I was instructed that the motor stock is ok to 15lbs with 100% 110 race fuel, above that you should look at rods and pistons. I would think you are close to the max boost before motor work is needed.

 

[sledheadd]

I have been running 17 lbs on 100ll for 2 years. MCX with head shim.

 

[ondast]

I know people running 300+ hp with stock motor. MCX stage 2. Don't know the boost but would be close to 20 psi.. No problem so far that i know off..

 

[Sleds R Fun]

Hey guys
Thanks for your replys. Looks like most people are experiencing some good luck with the nitro motor. Thats great to hear.