Some header help please.

N

NewBee-Cloner

New member
I would like some general idea of how to move torque on a clone engine with the header.
I'm a fat dude and need more torque out of a lifting corner.

The track has tight corners that cause a 1700 drop in rpms. 7300 down the straights. (Class weight is 400# and I weigh in at 445#'s)

I'm capable of fabricating a custom header design, and would prefer to do it this way.

This is a claimer class and would like to keep info of the build on the hush hush as some of my competitors are members here too. I'll just say the build is way more than the $300.00 claim.
 
I've dealt with your weight disadvantage myself on our asphalt sprint track and it's no fun. You need 12% more HP and torque to be equal to the 400# guys and that's a tall order from a motor that's already tapped out especially when you can lose it for a $300 claim.
What's your rules otherwise as far as engine size and so on? Could you use a predator 212cc?
 
Generally speaking, longer helps the low speed, and shorter helps the high speed. According to everything I've read on the subject, the four cycle exhaust pipe has only a marginal affect on horsepower. Of course every little bit helps. If you're coming off the corners at 5600 RPM and that's where you want the boost in torque, more than likely the pipe you now have will probably want to be shorter. Go slow, cut maybe a 1/2" at a time. Just remember, if it helps at all, it's not gonna be much. Pay close attention to your air/fuel ratio. You might find that the engine wants more or less fuel with a change in pipe. Let's face it, the reason for changing the pipe, hopefully, is to get more air through the engine, so more air means more fuel. Maybe not, but keep an eye on it.
Comments compliments criticisms and question always welcome
 
Its not just the length of the pipe that affects where your torque or power is made Al, the inside diameter of the pipe also affects your power curve and where it makes the most torque. I could be wrong, but i believe that the smaller the diameter, the more torque the engine makes, and the bigger the diameter, the more power/speed it makes.
 
rkcarguy said:
I've dealt with your weight disadvantage myself on our asphalt sprint track and it's no fun. You need 12% more HP and torque to be equal to the 400# guys and that's a tall order from a motor that's already tapped out especially when you can lose it for a $300 claim.
What's your rules otherwise as far as engine size and so on? Could you use a predator 212cc?
Click to expand...
Clone 196 and $300.00 claim that's all the rules for this class.
 
NewBee-Cloner said:
I would like some general idea of how to move torque on a clone engine with the header.
I'm a fat dude and need more torque out of a lifting corner.

The track has tight corners that cause a 1700 drop in rpms. 7300 down the straights. (Class weight is 400# and I weigh in at 445#'s)

I'm capable of fabricating a custom header design, and would prefer to do it this way.

This is a claimer class and would like to keep info of the build on the hush hush as some of my competitors are members here too. I'll just say the build is way more than the $300.00 claim.
Click to expand...
Hummm...a 'Claimer' and 7300 rpm?? Do you get too keep ur Cam (I hope)?
 
sCREamnClones said:
Hummm...a 'Claimer' and 7300 rpm?? Do you get too keep ur Cam (I hope)?
Click to expand...
NO, Complete long block is claimed, you only keep: carb, Fly Wheel, clutch, header, pump, and all tin. everything that's in oil goes to claimer.
But you do not have to sell, however you must go to another class after losing all points in the claimer class.
 
Weddle Racing said:
Its not just the length of the pipe that affects where your torque or power is made Al, the inside diameter of the pipe also affects your power curve and where it makes the most torque. I could be wrong, but i believe that the smaller the diameter, the engine makes more torque, and the bigger the diameter, the more power/speed it makes.
Click to expand...
Observe, I never said that length was the only thing that affects performance.
Power, torque, both the same thing. If you're going to go faster, you need torque at a higher RPM. Even if the torque doesn't change at all, if it's at a higher RPM, your calculations will show more horsepower. That's really basic.
Comments compliments criticisms and questions always welcome.
 
The guy who posted...above...about the pipe diameter was by far giving you the best tip.
The very best tip, however, is for you to experiment w/diameter.....length should be on the "long" side....
AND ....... wait for it ...... wait for it ......LOSE WEIGHT!!
If you are in fact, overweight, not just 230 lbs of muscle and bone, then you can tremendously help your karting chances....AND...improve your health and strength, by cutting your carbs in half, and work out to a rolling sweat EVERY day.

Try it....you'll like it.....and so will the wifey, if you have one!! :)
 
PD Power said:
The guy who posted...above...about the pipe diameter was by far giving you the best tip.
The very best tip, however, is for you to experiment w/diameter.....length should be on the "long" side....
AND ....... wait for it ...... wait for it ......LOSE WEIGHT!!
If you are in fact, overweight, not just 230 lbs of muscle and bone, then you can tremendously help your karting chances....AND...improve your health and strength, by cutting your carbs in half, and work out to a rolling sweat EVERY day.

Try it....you'll like it.....and so will the wifey, if you have one!! :)
Click to expand...

Exactly, tune the pipe to the track, experiment with different diameter pipes if you can and go by the stopwatch.
 
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