i was wondering if i would have to run racing fuel if i got a 240 big bore kit, hot rods 4mm stroker crank,34mm card,v-force reeds, fmf fatty pipe, fmf powercore 2, and a agrasive trail port and polish? i dont want to have to run racing feul
will i have to run racing fuel
- Thread starter yamahablaster01
- Start date
It all depends on how your motor is set up. If your going to have it ported, then tell the builder you wanna run pump gas. Most people will run 50/50 or straight race gas because you can get more power out of the motor
not to thread jack, but if buddy shaved the head on the 240 kit i just bought to where u gota run race gas, and i dont run race gas, what could happen?
the only way to tell is to do a compression test anything over 155-160psi and your gonna start needing to run race gas or you'll risk damage from detonation the higher the psi the higher the octane you must run
do all blasters knock? cuz you can clearly hear mine knocking. i should get some good audio of it because it knocks, but everyone says they all knock a bit. well i cant right now, all torn apartbut i can when its back together and done painted. probably like next week cuz this sh*ts going fast as hell so far.
none of the mods listed above will require race gas. the only mod you can do to need higher octane is to increase your compression. a big bore kit doesnt raise compression levels at all.
porting can increase compression if done right, but the biggest way to increase it is to have your head shaved to reduce the volume of the squish band so that is squeezes harder when at TDC.
go to HowStuffWorks - Learn How Everything Works! and search the word "octane"
porting can increase compression if done right, but the biggest way to increase it is to have your head shaved to reduce the volume of the squish band so that is squeezes harder when at TDC.
go to HowStuffWorks - Learn How Everything Works! and search the word "octane"
.if the head and the clearance is designed similar to its smaller displacment counterpart a significantly larger bore will usually add some static compression because theres much more squish band and crown area on the piston to match ,theres lots of complicated theorys on why it will do this fully understood by men smarter than myself ,but the best way to describe it is the trapped volume is critical but it works in unison with the squish band width to favor certain rpms and torque ratings in the powerband and really the same can be said for the squish clearance ..even the dome shape is important .increase the bore you ll generally get more squish band area evne if the clearance is the same .i have seen this personaly many times on comparing small and big bore banshees and blasters of similar setup .2stroke porting can never add static compression ...only reduce it. does this by increasing the port duration and drasticly increasing the given port area above BDC theres less time and area (cylinder wall) for fuel to be used before it has to ultimately exit ,it varies but usually on decent sized bores it can decrease compression by 5-15 pounds depending usually on your exhaust port height and shape ,also as far as what constitutes detonation and requires high octane rating is much more than just the static compression. it was a very informative article on how stuff works .com but unfortunatley its not entirely accurate especially for 2 cycle designs.the main things that will effect detonation and the need for race gas are ,static compression ,exhaust port height and area the ignition timing and spark voltage ,squish clearance .high octane rating (makes more sense to say anti -detonation rating) race gas burns slower and allows the fuel time to be compressed and burnt instead of ignite and explode the piston down too soon out of sync with the stroke/ignition timing and thats why you hear an erratic knocking sound ,your engine doesnt know if its coming or going lol and that concetrated area on the piston over time and the thousands of explosians will melt away the aluminum due to intense heat and burn a hole directly through the top of the piston and/or causing a seizure,this is why on engines that are detonating youll usually see little white flecks scattered over the porcelin and it will look whiteish ,thats actually aluminim from your piston being compressed destroyed and melted ,not a good thing !
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