High Compression

[naruto]

Hey all,

I was wondering if raising the compression ratio on nitro engines have any negative effects?

I ask because i have already done so, but i am yet to take it for a hard spin. I've only removed the standard cooling head shim and sanded down the cylinder sleeve(if that's what it's called..lol).

I thought I'd give higher compression ago only because i needed to rebuild the engine due too falling into a ditch full of water.

Thanks in advance

Bryan

[pre98zetec]

raising the compression is only used to run a higher percentage of nitro, it doesnt increase power on the same nitro, it may even run worse now that you did that.

[naruto]

Hmm. well i've just run out of petrol so i'll get some with higher nitro percentage, the engine size is .15 and i'm currently using %15 what do you think i should or can use?

Thanks mate your a big help

[pre98zetec]

if it was broke in and ran on 15% its a bad idea to change percentages this late in the game.

i would just spring for a new motor if its wore out, run that one on 20% though

[naruto]

cool, good thing you said 20% i would of definitely gone higher. I've got a stable job now so i will get a massive engine like i planned before i just hope gears for a TGS-R aren't expensive.

[lotus_man]

Raising the compression ratio (i.e. removing head shims) will tend to push combustion earlier in the cycle for a given nitro %age, which taken to extremes will cause detonation, more heat and a lot of stress on your motor. If you have removed shims from the head you want to DROP the nitro %age you run not increase it as that will increase the likelly hood of detonation.

There are plenty of good sites out there with information on how this all works! Best check them out before doing potentially expensive damage to your motor...