Yamanewf
New member
8CA'S empty, Y-G-Y, 50/42 helix, silver sec @ 60.
Machine runs like a raped ape.
8200 off the line
climbs to 8500 and holds.
Sounds good right.
Well, yesterday I got to run it on a really long lake (WOT for about 2-3 min) and around 85-90 mph the revs started to drift down untill she topped out @ 98 mph. They went from 8500 down to about 7800-8000. I thought that I was finished with the clutching. So what next? Are the 8CA's too heavy? Should I try a smaller finish angle on the helix or a different primary spring. OR could it be some other problem?
Machine runs like a raped ape.
8200 off the line
climbs to 8500 and holds.
Sounds good right.
Well, yesterday I got to run it on a really long lake (WOT for about 2-3 min) and around 85-90 mph the revs started to drift down untill she topped out @ 98 mph. They went from 8500 down to about 7800-8000. I thought that I was finished with the clutching. So what next? Are the 8CA's too heavy? Should I try a smaller finish angle on the helix or a different primary spring. OR could it be some other problem?
2 options
8 ab weights with maybe .8 gram in tip.
A helix with a shallower finish.
8 ab weights with maybe .8 gram in tip.
A helix with a shallower finish.
Yamanewf
New member
Any suggestions Turk? I have a 50/40, 49/37 & 48/34. Will I have to go back to the green spring?
Yamanewf
New member
Is there any general rule of thumb for X amount of degrees of helix angle will give you X amount of change in rpm? (Like primary weight: 1 gram of weight change equals 100 rpm)
Last edited:
try the 48/34 with green at 60. You may have to add tip weight & thats a good thing as that profile of weight works better that way.
There is no hard fast rule for helix changes as every manufacterer cuts em differently.
There is no hard fast rule for helix changes as every manufacterer cuts em differently.
Yamanewf
New member
Cool man. Thanks for the advice, I had figured that I would probably have to go back to the green spring due to the better clamping of the shallower finish angle. I was going to start with the 49/37 but I guess I'll jump right into the 48/34. The 50/40 is high perf eng. The 49/37 is a Bender, the 48/34 is a dalton.