Torque

I was wondering what kind of torque u guys are getting from your motors?I just talked on line with a guy with an 1170 kit and he says he can stand his kz up with a twist of the wrist.now im not doughting him at all,i just cant do that even a bit with mine.I just want to know what u guys have for torque.Am i missing some torque is realy what i need to know.I ride with a guy with an 02 929r and he makes me feel really slow.The 929 will list the front at eas.mine dosnt even feel light when i crack it.

With the RC400 cams you will not be starting to "come on the cam" until 5500-6000. So your torque will not be there below that anyway.

Remember this. Torque is what pulls you out of the corners, and horsepower will get you to the end of the straight. You can't have all of one without losing a little of the other.

So can i get there with new cams or do i need more cc"s as well?

Close ratio road race transmissions have a very tall first gear,I believe this is your problem.At 5000 rpm,
where the bike will pull hard,you are probably going too fast to get a good torque pull for a wheelstand.
Almost like a stock tranny in second.

Mark, one word...

GEARING.

Mark - Please fix the LONGGGGGGG link you have in your signature. It messes up every thread you post to... very hard to read end of lines. Thanks

Yes gearing would make you pull wheelies all day if you had a 14 engine and a 50 rear:evil: , BUT he wants a little sped too.

My sugestion is to lighten the chain 15 engine and 39 wheel those gears are 2.6 ratio and it shortens the chain at the same time. Yes a bigger bore will get you bigger torque nubers. Also the bigger the engine the more it wants to breath so the stock cams might not suply it the air it wants, grant it with stock cams you will be fine but your gear ratios in the trans will only restrict you to a certain speed you also need revs to get the speed. In other words more cubes more torque, more rpm more horse power. Torque times rpm = horse power. More horsepower more heat.

There is a lot more to it then that I'm sure. New bikes rev as high as 17,500 (yamaha 6) and are lighter and stiffer in the frame. Also new bike engines push 120 horses easy and are water cooled. Lets not forget the square swingarm so it doesnt flex as much as round swing arm (dancing on highway).

You might keep up with him at 0-100 but after that he will pull away from you.

After reading your signature reads like your already almost there. Bigger cams will move your power higher in the rpm .

I'm wondering what your cranking compression is?? If it is under 160psi I sugest upping it a little. With todays low qulity gas and your bike being a oil cooled engine tends to run a little more hot, so keep compression around 170 to a max of 180. Reads like you have a good combination on your engine right now. With the bigger cams you have right now it probobly lowered your cranking compression.

Changing compression ratio by one point changes cranking cylinder psi by about 20-25psi.
Also If you advance your cams you will up the cranking compression by closing the intake valve earlier.
What is the specs on your cam????

New bikes run a compression of 12:1 up to 15:1, but still have a cranking compression around 195 due to the cam closing the intake valve later. Thats how they can run a 15:1 compression on pump fuel. Lets not forget again that it is water cooled.

Post edited by: Snakebyte, at: 2007/07/06 10:24

Wheelie medicine-the little blue bottle.

Torque at the rear wheel is only one part of a wheelie. Far more important is the geometry. If the wheel base is short enough, and the center of gravity is high enough, anything can wheelie. A stock moped can wheelie if you lean back or have a passenger and they are not exactly known for their torque.

my bike has a 15 front and 35 rear and stock tranny. It comes up fast and hard and will flip right over if i'm not careful. I can pull it up in second with some leaning. In first gear if i wack on the throttle it stands straight up at virtually any speed. I can advance the timing (points) and it starts coming up at 5mph. I can retard the timing to the point it starts lifting at 20 or 30. With the cams I have, the compression is 150. It is NOT all about compression. I've had 220psi and it does not help due to breathing. Course I had stock cams then but there was no diff. from 180 to 220. It must be your tall gear.