I did some timed runs this weedend my goal hopefully is surpass 100 mph as you know. The problem I am having is heat. I did have 6.5 to one pistons in combined with 3 stages of NOs this was more than ample to propell me over my target speed only I have to maintain the speed for one mile not counting the acceleration distance. All added up to melt down unfortuneatly I punched a hole in the front piston and melted the top of the rear piston this happend about a month ago. Now I have my Wisecon pistons in with only one stage of NOs as the motor will not take more than the first stage because of the higher compression.

I tried this weekend for a speed run and again heat is a major factor. Now with pump gas I can only hold the throttle at full for 5 seconds before temperatures reach 1200* exhaust temperature. A good friend sugested C12 or C14 gas this did double my time but still not long enough. My next problem my big butt will only allow me to go roughly 93 while my lighter son can manage 98 but we have to shut down early before the end of one mile.

What frustrates me is my sons Yamy 650 4 cylinder motorcylce has no problem doubling 100mph on premium gas and can do this all day long, where as my quad!! I know I could make this thing work on alcohol but I was hoping to do it with pump gas and NOs. Maybe all I need is a bigger hammer, lol.

Just thought I would vent a little thanks for listening.

 

That is the worst aero machine you can ride wrap a hoop around the front like a 180 % front and let it drag the surface it will pickup like crazy and lay down behind the bars ..if that wont do it take the belts off go to a chain pri to sec and shove it off blocks with a push start she will do 130....lol....with 130 hp thats the way it is...Lol....jh

 

I don't know if its possible for that little engine to get rid of heat fast enough, regardless of the cooling mods you could throw at it. Even with a larger/more efficient radiator, water can only pull heat so fast. And you've pushed the motor far beyond what anyone at kawasaki ever considered. Sounds like your problems are about the same as we have with diesel trucks, so a couple solutions may lie in that direction.

I'm not sure what you are running for exhaust, but if you bought it from anyone, it is going to be too restrictive for this application. Opening up your exhaust ports and dumping into really large pipes should drop your temps some, but you might lose a little torque. On the intake side, big open ram and water injection should help, but you'll have to cart around a water tank. Just a couple thoughts...

 

or you could find a really long hill, and roll down it in a windstorm with a 100+mph tail wind on pizza cutters, lol.

 

Alltoys, maybe I can give you a few suggestions.
jhmach gave you a good suggestion about making your quad more aero. You might not be able to do this because of class or rules or whatever, but it will help a ton if you can do this?
ManicHaze also gave you a good suggestion about the tires. On fuelers, or any open wheel class car this is the single most aero problem. Get the narrowest you can get, and be sure they are speed rated for what you are trying to do.
As far as the engine problems go I would go very low in compression and go the the 3 stage again. N2O has more than 30% O2 in it. Air has only 20%. Give it the O2 to make more power. Nd is also on the money about the pipes. Open them up. You can go to 2 into 1 if you want but just make them straight drag pipes.
The single most important thing to cool combustion temps off is water/alky injection. It will do wonders and keep your engine alive. Also go very rich on your mixture, it will kill some power but it will keep the EGT's down.
Another thing I would suggest is some sort of a timing retard system. With the high doses of N2O you are using, it will make your engine live.
Another thing is piston and combustion chamber coatings. For what you are doing I think it would be a good idea if not essential.

Good luck and hope you make it.

 

I thank you all for your help. My gearing is spot on I do have a cdi that I can program to give less timing at point of NOs injection. I also have street tires made for drag racing tall and narrow especially for speed. The biggest problem is heat that the NOs generates.

Doctorturbo,
I believe you are right I will have to go back to low compression pistons with water injection as well. I did not believe how much power it takes to get this unaerodynamic block of cement to go over 80 mph let alone 100mph. Have you had a chance to adapt your V with a turbo yet?

Jhmach,
Unfortuneatly I can't use anything to reduce drag not even a windshield they are allowing me to use aftermarket tires that is about it. I will try a different exhaust I was using IDS X2 with 3 stages of NOs it worked good but still to much heat. I thought with higher compression pistons less NOs would work better but not a chance. I will however make a stepped straight pipe first to see if that is enough then if not I wll go back to less compression pistons.

I want to leave this quad as original as possible I took on this barrier some time ago just because it hadn't been done with a utility machine. I didn't realize what an undertaking it could become.

 

I see what your trying to accomplish now good luck with this run...jh

 

Amazing isn't it!!!!!! Crazy what bad areo dose to speed!!!! I agree with you in how much HP it saps.
Nawwwwww, I'm old and my bones heal slow. All of my turbo work was on cars. My V is all stock and about the only thing I'm going to do is a 3 stage anti-reversion pipe that I'm designing with a reworked stock muff. Should fill my needs. If I want to go fast, I drive my buddies drag Vega. That way I don't get road rash. [img]i/expressions/face-icon-small-happy.gif[/img]
If you are going to try this again with the same pistons I can not stress enough about the water/alky injection. It's simple to rig up and very cheap to do. This WILL make your engine live when nothing else will. Believe me on this, it will shock you, on how good it works.

Also, jet up on the fuel side of your N2O, this will also make your engine live but it will also hurt power some. You may make your 100mph or may not, but if you don't you can lean it up to make more power.

Another little trick we did when we were qualifying our car was to duck tape some of the grill off. You might or might not be able to do this? Just thought I would mention it.

Another thing you might want to think about is cleaning all of your wheel bearing with solvent and then lubbing them with 90 weight oil. Do you need 4 brakes? If not, take the fronts off, or take the pads out so they don't drag.

You may know none or all or these little tricks. I'm just throwing them out there to help you. Some of these idea's sound extreem and some of them are; but as you know, it all adds up.

Good luck and hope you make it happen!!!

 

What's your air:fuel?
On the bottle for a long time you will need to tune super rich like 10-10.5:1 to keep the cyl head temps down.

 

One thing that was not mentioned was the fact that primary drive is still a belt, and at that speed, engine RPM, and load on the belt at that speed, a lot of your power is used making heat on the belt. More heat, more friction, more drag. I was considering machining plates that would house a standard transmission, maybe from a big bore single dualsport, between the primary and secondary clutch shafts. I have a vertical mill and lathe in my garage now, and it sounds like a challenging project, and I think it's very possible.