jbones Posted November 21, 2008 Report Share Posted November 21, 2008 I have 87 banshee .015 off the head rad vavle toomy pipes k&n filter no lid on box 3/8 reed spacer boost bottle stock carbs 270 main jet run 32.1 pump gas ricky stator adjustable timing plate set at zero what could i do with timing to get a little more power ? Quote Link to comment Share on other sites More sharing options...
2001Stroker Posted November 21, 2008 Report Share Posted November 21, 2008 +4 is a good starting point, and usually where you should be. also remember, when changing your timing, you may need to upgrade on your fuel octane. that keeps you engine from spark knocking. what octane are you using now? what is your elevation? and what compression do you have? also, try to use punctuation. makes it easier to understand. Quote Link to comment Share on other sites More sharing options...
jbones Posted November 21, 2008 Author Report Share Posted November 21, 2008 +4 is a good starting point, and usually where you should be. also remember, when changing your timing, you may need to upgrade on your fuel octane. that keeps you engine from spark knocking. what octane are you using now? what is your elevation? and what compression do you have? also, try to use punctuation. makes it easier to understand. I run 93 octane,im at about 300 above sea level,and not sure about compression.Use maxum 927 two stroke oil. Quote Link to comment Share on other sites More sharing options...
2001Stroker Posted November 21, 2008 Report Share Posted November 21, 2008 Check your compression. I would start at +2. Make sure it isn't detonating, and then add another degree. If it's detonating, you will need to up the octane to maybe 100. You should be good though. Make sure it doesn't detonate, cause that will do some nasty damage to your pistons and head. Quote Link to comment Share on other sites More sharing options...
T_Shee Posted November 22, 2008 Report Share Posted November 22, 2008 Check your compression. I would start at +2. Make sure it isn't detonating, and then add another degree. If it's detonating, you will need to up the octane to maybe 100. You should be good though. Make sure it doesn't detonate, cause that will do some nasty damage to your pistons and head. how easy is detonation to detect and how? and jbones, for future reference either ditch the boost bottle and reed spacers or dont bring them up cuz people around here have lots of negative opinions about them. do a search Quote Link to comment Share on other sites More sharing options...
2001Stroker Posted November 22, 2008 Report Share Posted November 22, 2008 If you can hear it spark knocking over that loud ass 2-stroke, that's really bad. You can use a stethoscope to listen to the engine while it has a load on it. Removing the head and checking for pits is probably the best way. Anybody else got other ideas? Quote Link to comment Share on other sites More sharing options...
stageIVbanshee Posted November 23, 2008 Report Share Posted November 23, 2008 (edited) what causes detonation? how can you find out before it blows? does it make a knocking noise and if so how loud is it? do i need 110 octane if i advance the timing? stage IV head w/ 20cc domes boyesen reeds fmf fattys with powercore 2 bored .50mm over 40mm single carb Edited November 23, 2008 by stageIVbanshee Quote Link to comment Share on other sites More sharing options...
2001Stroker Posted November 23, 2008 Report Share Posted November 23, 2008 Scroll down and read the Abnormal Combustion, and Pre-Ignition sections. http://en.wikipedia.org/wiki/Engine_knocking Quote Link to comment Share on other sites More sharing options...
firebanshee Posted November 23, 2008 Report Share Posted November 23, 2008 what causes detonation? how can you find out before it blows? does it make a knocking noise and if so how loud is it? do i need 110 octane if i advance the timing? stage IV head w/ 20cc domes boyesen reeds fmf fattys with powercore 2 bored .50mm over 40mm single carb The heat created when compressing the air fuel mixture causes a low quality fuel to ignite in a higher compression engine.The air fuel mixeture ignites before it is suppose to while the piston is still in it's upstoke causing it to make a pinging sound.The pinging sound is the piston and rod assembly rattling from the force of the fuel igniting before it is suppose to needles to say this damages your engine quickly.This is how a diesel engine is designed to run and that is why they are typically noisey. If you are at sea level then you need to mix your fuel at least 50/50 93 and race gas running 20cc.Advancing your timing does make your motor detonate easier,but if you go 4 deg at 50/50 and 20 deg you should be alright,this is at sea level the higher up you go in altitude the smaller dome you run without using race fuel. Quote Link to comment Share on other sites More sharing options...
bansheejoel Posted November 23, 2008 Report Share Posted November 23, 2008 4 Quote Link to comment Share on other sites More sharing options...
T_Shee Posted November 23, 2008 Report Share Posted November 23, 2008 +4 if im at +4 timing and around 130psi on both cylinders should i be running higher octane than 94. im around 800-900 elevation. i have a stock head shaved .015 and a squish of .045. Quote Link to comment Share on other sites More sharing options...
2001Stroker Posted November 23, 2008 Report Share Posted November 23, 2008 if im at +4 timing and around 130psi on both cylinders should i be running higher octane than 94. im around 800-900 elevation. i have a stock head shaved .015 and a squish of .045. We need to know what PSI are in the cylinders. Did you put a guage on it yet? Your compression ratio and timing dictate what octane fuel you need. Octane is only a number for rating when the gas will spark-knock. Gas is not rated Good, Better, Best. Find out what the compression is, and get back with us. Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted November 23, 2008 Report Share Posted November 23, 2008 im at around 400-500 elevation. i am running 19cc domes, stock exhaust port height, and +5 timing on 93 pump gas.. no problems.. not sure what my compression numbers are but i would say around 140ish.. now im gonna go check it for curiosity.. Quote Link to comment Share on other sites More sharing options...
stageIVbanshee Posted November 23, 2008 Report Share Posted November 23, 2008 (edited) i am not sure but i am going to get a compression gauge today and check. by the way i am at sea level. Edited November 23, 2008 by stageIVbanshee Quote Link to comment Share on other sites More sharing options...
2001Stroker Posted November 23, 2008 Report Share Posted November 23, 2008 Where did jbones go? This IS his thread, right? Quote Link to comment Share on other sites More sharing options...
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