Lock up clutch

[SlowMoe]

Ok so I just got my banshee back from my builder and the clutch is slipping pretty bad. It is a ported 4 mill with 3 super stiff clutch springs and 3 stiff ones. Clutch plates appear to have plenty of life left.

 

Is this pretty typical for a pump gas motor? At what HP level is a lockout usually needed?

 

 

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[spurdy]

Ok so I just got my banshee back from my builder and the clutch is slipping pretty bad. It is a ported 4 mill with 3 super stiff clutch springs and 3 stiff ones. Clutch plates appear to have plenty of life left.
 
Is this pretty typical for a pump gas motor? At what HP level is a lockout usually needed?
 
 
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Id say 80 hp and above needs a lock up. I've got a 4m aggressive dune port on pump gas and I run a lockup.


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[SlowMoe]

Yeah mine only pulled 68 Hp on the dyno but it is a very conservative dyno. Or maybe it only pulled 68 because it is slipping. Dunno

 

 

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[SlowMoe]

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[spurdy]

Honestly, I don't know any numbers from anyone's bike that's been on Brently's dyno. But I think I would trust his number.


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[SlowMoe]

I assume Bentley is AKA Dunetoyz?

 

According to him those are typical ported 4mill numbers.

 

For some reason I assumed it needed to be a drag motor on meth to warrant a lock up. Guess not

 

 

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[spurdy]

Yes, Brently Gorman is Dunetoyz.

 

Mine 4m stock cyl on pump gas made 78 hp on the dyno at little Sahara years ago. It was ported by HJR and runs pretty darn good for what it is. I put the lock up in it when I had problems holding the clutch.

 

 

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[SlowMoe]

Thanks for the input. I should say they are typical numbers.... On HIS dyno..

 

Hear anything bad about the driveline lock up? That's the one I was considering.

 

 

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[ClaudeMachining]

I went from a mild ported stock cyl, stock carbs with T5 to a clean ported driveline 421, 35mm setup with snipers pipes. So we can say maybe from a 50hp to a 75-80hp engine.

The clutch was all stock and was doing good in the first setup, but was sliping badly on the other setup. I putted a driveline lockup and everything is fine now.

[SlowMoe]

Do they affect shifting at all?


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[trickedcarbine]

9 hours ago, SlowMoe said:

Do they affect shifting at all?


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Yes. Didn't you do a pro mod once upon a time? That'll be the best way to combat it. 

[SlowMoe]

Yeah I think I did a diy like 5 years ago.

Fawk. Just literally paid someone to put it back together because I am too lazy these days. I'd hate to have to pull it back apart to cut the transmission.

 

 

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[ClaudeMachining]

9 hours ago, SlowMoe said:

Do they affect shifting at all?


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I like my combo DL lockup and standard springs. If you put HD springs with no lockup, the clutch lever will be always hard. If you put lockup with standard springs, the clutch lever will be hard only at high rpm.

[SlowMoe]

I like my combo DL lockup and standard springs. If you put HD springs with no lockup, the clutch lever will be always hard. If you put lockup with standard springs, the clutch lever will be hard only at high rpm.

Do you have your tranny modded?


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[ClaudeMachining]

Just now, SlowMoe said:

Do you have your tranny modded?


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Yes. I dont use the clutch that munch to shift anyway.