Clutching on the cheap

[Alsim]

No, it is roughly 1 gram for each 200 RPM. So putting a 1 gram weight in all 3 weights should lower you approximately 200 RPM. That is just a rule of thumb though and not an exact science.

150 rpm. It's my fault this is what I mean. But now I understand 1 gr on each weight will decrease approx 600 rpm ?

 

[stingray719]

150 rpm. It's my fault this is what I mean. But now I understand 1 gr on each weight will decrease approx 600 rpm.
Thx!

No, 1 gram on each weight (total 3 grams) is 200 RPM. We speak of adding a gram with the assumption the gram will be added to all 3 weights.

 

[Alsim]

No, 1 gram on each weight (total 3 grams) is 200 RPM. We speak of adding a gram with the assumption the gram will be added to all 3 weights.

Ok Thank you Stingray ! Now I understand

 

[sparky72]

I am running the COTC setup with 4 shims, 8dn and helix shimmed. It ran 96 mph (97 on speedo) with stock clutching and 300 miles on sled, now only runs 90 (91 on speedo) with 900 miles on sled in similar conditions. Is this normal to lose 5-6 mph up top with the COTC?

 

[stingray719]

I am running the COTC setup with 4 shims, 8dn and helix shimmed. It ran 96 mph (97 on speedo) with stock clutching and 300 miles on sled, now only runs 90 (91 on speedo) with 900 miles on sled in similar conditions. Is this normal to lose 5-6 mph up top with the COTC?

A couple of things,

1. what is your top rpm before and now
2. does the sled run faster in the start to mid range and drop off fast after 80mph?

 

[sparky72]

TE="stingray719, post: 1209310, member: 15995"]A couple of things,

1. what is your top rpm before and now
2. does the sled run faster in the start to mid range and drop off fast after 80mph?[/QUOTE]
With stock clutching, it was around 88-8900. With COTC its hanging around 9-9100.
And yes, seems to fall on its face around 80, then creep up after that

 

[sparky72]

Would a dual angle helix help this? Not a real big deal, like the arm stretching as it is, but just figured if it did it before then its obviously capable of it.

 

[stingray719]

Would a dual angle helix help this? Not a real big deal, like the arm stretching as it is, but just figured if it did it before then its obviously capable of it.

Yes dual helix will help. Also going to 2mm shim will take away some of the mid range and add it to the top, set as you prefer. Also make sure you set the secondary to 3-3 if you are going for top speed and let us know.

 

[sparky72]

Ok, its set at the factory 6-1 right now. Will make the adjustments and post results.

 

[fc8464]

What will happen with the 8FP weights and factory spring? Got the weights now but not the GWG spring and going ridding tomorow. Fred

 

[NOS-PRO]

What will happen with the 8FP weights and factory spring? Got the weights now but not the GWG spring and going ridding tomorow. Fred

You will be very low on rpm's. Do you have any primary springs available? The stock spring is too weak to run those weights....even empty. Thunder Products black spring is close, Heel clicker white or gray is close....

 

[fc8464]

Thanks. I think I will leave it stock till I get the right spring.

 

[fc8464]

Any opinions of the soft touch spring at BOP?

 

[stingray719]

Any opinions of the soft touch spring at BOP?

I am now running that spring on both my Vipers. But I also run 6mm or 7mm shim. Butt dyno is not sure I lost any performance and if I did having that super soft start is worth it. At 25 bucks it is a pretty cheap test.

 

[fc8464]

Thanks, went ahead and ordered one. Are you using that many shims for top end or your altitude. I have a MTX at low elavation so no need for top end speed just power at low and mid.