Backcountry..
From discussing this with DJ my understating is the goal is to keep belt running to approx 3/4 of a inch of the top of the primary, witch gives a 1 to 1 ratio and our lowest belt temps..
Currently with the stock setup big pin weight and stock gearing I am running to the very top of the primary, have you looked how high your running up the primary with that big of gearing.. I was only thinking two teeth, not four
Will stock chain work or will we need to replace it with longer one.. Thanks
Fred - Need more data. What is your track speed when pushing the belt to the rim of the primary clutch? When we talked on the phone you said your track speed was less than your theoretical maximum speed and I went through this example below. (
when people talk clutching to me on the phone they should be recording it)
Fred)I am running to the very top of the primary
Joe) what is the theoretical mph supposed to be at the rim of the primary in full overdrive?
example - If the sled is geared to go 90mph at full shift overdrive or where you say the belt is near or at the rim...but (there's that word "but")
..but your track speed is 75mph...
Question - where is that 15mph disappearing to?
- Sled geared for 90mph
- Belt at rim of primary (90mph)
- Actual track speed 75mph
...where did the theoretical 15 mph go?
To capture that missing mph you will have to take the angle of the helix ....at 1:1 clutch ratio and lower it at least 2 degrees.
Say you had something like a 44/40 (44, 43, 42,
41, 40)
5 separate degrees divided into 90mph (full shift) is 18mph per helix angle.
18 mph x 4 degrees = 72mph
At 41 degrees the combination of the helix angle and the secondary spring force being used is not enough to clamp the belt - the secondary sheave is literally blowing open at 75mph. The sheave cannot hang onto the belt anymore and convert your available engine torque.
At 41 degrees you have a choice. Either lower the helix angle at that degree (41) by 2 degrees or
Take the secondary spring finish force and raise it by 30 lbs. Example XXX/300 to a xxx/320 or xxx/330.
Regarding the helix angle you would be having to put in at least a 44/38 or 44/36 to get the secondary to start to grab hard on the belt again and not be overcome and sheaves push full open.
That above was an example of how to figure out how to solve "missing trackspeed" by way of the helix angle or secondary spring or a combination of both.