Drilling holes in clutch bell housing??? Anyone try it??

Simonsr50 · Post by **Simonsr50** » Thu Mar 29, 2012 10:20 pm

Just installed 9.8 gears and lost a little low end and my clutch seems to be slipping a bit more nOw. Has anyone drilled holes on the outer part of the clutch housing to cool it down on take off? I know they sell em drilled but can u drill a stock one withouy a problem.??? If so any tips???

eliteguy50 · Post by **eliteguy50** » Thu Mar 29, 2012 11:52 pm

The clutch is going to slip more with taller gears.

Why not just leave the rear half of the cover off?

Several people have drilled holes in the oem cover. I suggest removing the cover from the engine so you don't drill into mechanical or stressed parts.

Simonsr50 · Post by **Simonsr50** » Fri Mar 30, 2012 12:20 am

Sorry I should have been more specific. I already leave the rear housing off, I was talking about drilling around the actual clutch bell that the clutch shoes grab on.

eliteguy50 · Post by **eliteguy50** » Fri Mar 30, 2012 12:39 am

Like cross drilling? It can de done. I had an aftermarket bell like that. I've always been a bigger fan of increasing heat dissipating surface area than decreasing my friction grabbing contact area for increased venting. Like a finned clutch bell.

Some people also drill large holes in the front part of the cover for fresh air to come in past the variator instead of a back draft effect.

bakaracer · Post by **bakaracer** » Fri Mar 30, 2012 12:41 pm

Simonsr50 wrote:Sorry I should have been more specific. I already leave the rear housing off, I was talking about drilling around the actual clutch bell that the clutch shoes grab on.

DON'T DO THAT!!!! it will unbalance the bell and the bell will blow up. the clutch bells that have holes drilled also have a reinforced ring on the outside of the bell to keep it from exploding. drilling the bell will weaken it. if you dont believe a clutch will explode. watch this video.
http://www.youtube.com/watch?v=mXn6SuU_8Jw

damnSA50 · Post by **damnSA50** » Fri Mar 30, 2012 2:15 pm

Holy scary video, if you were riding that, youd be swiss cheese.

JustynCRX · Post by **JustynCRX** » Fri Mar 30, 2012 2:37 pm

could you imagine the crash from that if you were riding when that happened?

paulpauly7 · Post by **paulpauly7** » Fri Mar 30, 2012 2:58 pm

HOLY S H I T

Dio89Elite · Post by **Dio89Elite** » Fri Mar 30, 2012 10:29 pm

I guess I won't be drilling my clutch bell housing any time soon,

if ever!

Yup, I've noticed that reinforced ring on a couple of those pre-drilled clutches.

fastplastic · Post by **fastplastic** » Sat Mar 31, 2012 2:29 pm

you could probably use a new clutch and clutch springs that should fix you right up...

deuce217 · Post by **deuce217** » Mon Apr 02, 2012 1:25 am

Wow, I would not have guessed that failure...

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Drilling holes in clutch bell housing??? Anyone try it??

Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??

Re: Drilling holes in clutch bell housing??? Anyone try it??