redsnake3
New member
i found a guy very close that does snowmobile dynoes on the crank, was wondering what to look for when getting it dynoed, what should i bring(other than the sled 
) what things should i look for on the dyno run that would bring the hp number higher than it would be normally(i know that there is ways to get higher numbers by putting in different variables). any help is appreciated.
) what things should i look for on the dyno run that would bring the hp number higher than it would be normally(i know that there is ways to get higher numbers by putting in different variables). any help is appreciated.bluehammer
New member
Take the tools you think you will need to change plugs and jetting and pipes, if you have extra pipes available. Take the fuel you would normally use, extra mains and pilots in various sizes. Don't forget extra plugs. This guy may have everything you need in his shop to use, but you probably will get more help from him if you show up with your own stuff. Normally by looking at the fuel curve on the dyno will get you different hp and torque numbers. Raising the rpm will tell you something also, but if you are running stock pipes, then use those rpm numbers to do the dyno pulls. If you know where your aftermarket pipes should run, then run the dyno at about that number or maybe run 'em 500 rpm higher to see if the hp increases. Don't forget to look at the torque numbers to see where the motor builds the highest torque. He should be able to give you copies of all the pulls for your records.
You're looking for real numbers on the dyno, not something that is fudged and looks good on paper. Mention that to him so he gives you the right setup on the dyno. Do your first pull with the carbs rich just to give you a baseline to work from. Better to spend the time leaning it down than spending time changing a piston. Use your own varibles. Run hot pipe, cold motor, warm pipe warm motor, etc. just to see how the numbers change. That will tell you what your motor wants. It may want a ton of fuel, something that only a dyno will show. When you leave, you should be satisified with your hp numbers and know that that is all the motor has to offer.
You're looking for real numbers on the dyno, not something that is fudged and looks good on paper. Mention that to him so he gives you the right setup on the dyno. Do your first pull with the carbs rich just to give you a baseline to work from. Better to spend the time leaning it down than spending time changing a piston. Use your own varibles. Run hot pipe, cold motor, warm pipe warm motor, etc. just to see how the numbers change. That will tell you what your motor wants. It may want a ton of fuel, something that only a dyno will show. When you leave, you should be satisified with your hp numbers and know that that is all the motor has to offer.
redsnake3
New member
i seen some very good points in there, thanks alot bluehammer. anyone else got any more info? how about the fuel curve how do i read that? and as for the horsepower numbers, im not so much worried about the numbers asto where they are located, and how compression and fuel changes them