I have all stock motor, with uflow intake an D shape bbr exhaust. Also 4th gear drum, tb clutch, primary gear. I'm planning on a 165 kit down the road, but for now want something more to make it snappier. Just wonder if the stock internals will handle the higher octane or should I mix half an half.
Can stock 110 handle race gas
XC124
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You are saying everyone is wrong except you? haha Well FYI im in my senior year of Mechanical Engineering and a have a emphasis on internal combustion engines. I also have been working on bikes for 8 yrs and have owned over 20 different bikes and worked on probably over 100 during the time i worked at a shop. So yes i have a very thorough understanding of what goes on in ICEs. All you stated was exactly what i was saying just you went into the exact characteristics of how the fuel burns so before you say everyone is wrong you need to think.
Oh, and to answer the OP's question, the race fuel would yield minimal gains as the comp ratio is very low so little or no benefit will come from it.(i ride a stocker and run 92 octane from Shell)
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Hahahaha. You guys are sensitive. Sorry. Didn't mean to hurt your feelings fellas.
Bottom line is this.
If he put VP U4 in his bike in stock form he would absolutly notice power gains. Would it be worth the money to use it to play ride? That's not for us to judge. He can do what he wants with his money. Who knows. Maybe hes got it like that.
Fact is, race gas will improve hp on his bike your push mower and a full blown race bike.
End of story.
Bottom line is this.
If he put VP U4 in his bike in stock form he would absolutly notice power gains. Would it be worth the money to use it to play ride? That's not for us to judge. He can do what he wants with his money. Who knows. Maybe hes got it like that.
Fact is, race gas will improve hp on his bike your push mower and a full blown race bike.
End of story.
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Well dude. Your not way wrong. Just a little off. First of all there is many many different race gas blends out there. So turbo blue, a budget race gas. Your right. Next to no gain. Maybe 2%-5%. He uses VP U4. He WILL gain 10%-12%. If you call that minimal...?
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i know there are different race gases, i was simply starting the general rule of thumb and the general benefits from using them. I dont claim to know about all of them as i havent looked into all of it nor have i ever used race gas of any sort in my bikes, i cant justify the extra cost for the benefits or smell 
Idk if you can say that he will gain a certain amount just because he uses a certain fuel, there are too many other factors. One of the biggest benefits from race gas is simply the efficiency with which the fuel burns. as you stated it is a longer burn rather than a quick "pop" so there will be less vibrations and can increase the life of the engine as well as run more quietly(very little difference) Also many race fuels run cooler and that helps with engine life as well.
My feelings werent hurt lol i was simply saying that you didnt have to come on here and tell everyone they are wrong and your way was the only one that was right because there are alot of people that are on here that know alot about this stuff, some know more than me and you.
Idk if you can say that he will gain a certain amount just because he uses a certain fuel, there are too many other factors. One of the biggest benefits from race gas is simply the efficiency with which the fuel burns. as you stated it is a longer burn rather than a quick "pop" so there will be less vibrations and can increase the life of the engine as well as run more quietly(very little difference) Also many race fuels run cooler and that helps with engine life as well.
My feelings werent hurt lol i was simply saying that you didnt have to come on here and tell everyone they are wrong and your way was the only one that was right because there are alot of people that are on here that know alot about this stuff, some know more than me and you.
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Just a little off dude. I ran pump gas in my 2 strokes the entire time I raced and never had issues. I'm not saying there aren't some benefits to using race fuel but you're insane to think pump gas automatically means your bike is going to explode. IrMx353 said:
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You are correct. A stock 2 smoker can use pump gas with no issues. The factories know that our pump gas isn't what it used to be. So the motors are set up to burn (aka pop) todays pump gas. That said, on that YZ one two five shown above, taking 30 thou. off the head alone (not even high comp piston) it would detonate its self to death.
Some $0.05 knowledge a 2 smoker will eat its self 2 times quicker then a thumper, simply due to the smoker firing every other stroke.
Also I've found that some people are not aware that detonation ONLY happens at the upper RPM's. If you notice detonation happening, keeping the motor "off the pipe" will stop all detonation and the damage it causes.
Another issue with pump gas is they add ethanol to it and if you look at vp it has ethanol in it too but the vp mix is consistent so one drum is the same as the next where as the pump fuel varies with the season so your car starts ok when the weather is cold but it mucks with the bikes jetting a bit.
If you have a well modded bike and tune it to avgas (i have drums of it for another bike and yes its a 2 stroke) you will be able to run more ignition advance and that will get you more hp but putting it in a stock china motor would be a waste of time unless your pump gas is truly crud in which case i would change brands of pump fuel.
if my stroker isn't on the pipe i am probably rolling out of the pits
I should probably add that there is a variety of diferent types of race gas avgas is one sort but there is also stuff called elf wrf the supplier told me its 102 octane and rather than go fizzle in your cylinder and burn a bit here and bit there it goes bang all at once but at 8 bucks a liter it isnt cheap and the class i race 4 strokes in specify pump gas only lucky we have 98 octane comeing out the pumps here.
Ethonol is another choice runs cooler but you burn 40% more.
If you have a well modded bike and tune it to avgas (i have drums of it for another bike and yes its a 2 stroke) you will be able to run more ignition advance and that will get you more hp but putting it in a stock china motor would be a waste of time unless your pump gas is truly crud in which case i would change brands of pump fuel.
if my stroker isn't on the pipe i am probably rolling out of the pits
I should probably add that there is a variety of diferent types of race gas avgas is one sort but there is also stuff called elf wrf the supplier told me its 102 octane and rather than go fizzle in your cylinder and burn a bit here and bit there it goes bang all at once but at 8 bucks a liter it isnt cheap and the class i race 4 strokes in specify pump gas only lucky we have 98 octane comeing out the pumps here.
Ethonol is another choice runs cooler but you burn 40% more.
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Your telling me that the return pulse of exhaust gasses, after traveling from the cylinder to the nozzle of the expansion chamber and back are still going to be hot enough to ignite the fresh fuel charge? HA.
You need higher octane in a stock 4-stroke?
Explain to me this one.
2006 KX250 2-stroke Compression Ratio = 10.5:1
2006 KX250F compression ratio = 13.5:1
How the eff does that work?
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Haha you have got to be kidding me. Race gas is definitely the fix for that problem.
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Finally a correct statement.
.030'' off the head? Thats a freaking huge amount on a 2-stroke cylinder head (Motocross engines).
This has absolutely NOTHING to do with the life span of an engine.....
:bsflag:
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The exhaust gas is hotter than the intake gases, but the heat of the exhaust gas does not iginite the fresh fuel, it will ignite hotter unburned fuel in the recirculated gas when compressed. There will be hot "pockets" that when the gases are compressed will heat up and are an area that has more potential to detonate.
You read my post wrong i was saying 4 strokes are less prone to detonation, this because the cylinder charge is much cooler than in the 2 stroke because there is much less recirculated exhaust gas.This means a 4 stroke can run lower octane fuel for the same CR.
So before you try to roast someone learn to read
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If your motor is only lasting about 15 hours than you have bigger issues than just race gas.Mx353 said:
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I'm not going to even bother...But you're wrong.
You say your a senior in Mech Engineering...Might wanna transfer to a real school.
And before you say anything, I designed the space station, space shuttle and the iPhone 4s so I definitely know what I am talking about.
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If im wrong then why dont you explain to me why im wrong rather just say i am? i mean i am always willing to learn, but if you dont explain then i think you are full of hot air. I see you like to bash a lot of people on here about what they know so i really dont care what you say.
And Btw im at one of the top 5 schools in the US for ME
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Not bashing just putting my 2c into the conversation with a small twist of humor in there.
I don't feel like explaining because...Well, honestly because I am lazy.
And I like to think that I am only partly full of hot air, otherwise the cam phasers that I work with now might not work correctly in the new Fords (Coyote 5L V8, and PV8 6.2L V8, and some Jaguar stuff).
Sorry if I came off as bashing, I guess the crack about the school was a little unnecessary. I am always up for a good technical debate (I'm actually a senior in an ME progam here in NY, but out on Co-Op right now), as long as nothing gets personal and no feelings get hurt. lol
I don't feel like explaining because...Well, honestly because I am lazy.
And I like to think that I am only partly full of hot air, otherwise the cam phasers that I work with now might not work correctly in the new Fords (Coyote 5L V8, and PV8 6.2L V8, and some Jaguar stuff).
Sorry if I came off as bashing, I guess the crack about the school was a little unnecessary. I am always up for a good technical debate (I'm actually a senior in an ME progam here in NY, but out on Co-Op right now), as long as nothing gets personal and no feelings get hurt. lol
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