13 replies to this topic

[Tomf]

Whats the advantage of drilling the clutch cover, like this:

[miniboo]

you can use ot for draining spaghetti?

makes it lighter?

helps heat from the clutch get out quicker and easier?

to be honest i am not sure as you may have guessed.

it does look cool though

[Grayedout]

Simply weight loss. Only really for race cars !

[Tomf]

ok thanks i was just wondering as i saw them and was wondering about road use but as you said i cant use it for that dont worry.

Thanks

[Turbo Nick]

heat loss is the reason i've done it on my car, i'd imagine it would get a little warm in there with 160+ ft/lb and hardly any flywheel left to dissipate the heat.

[nmt_oli]

Is there a risk of oil contamination since a-series's are notouriously leaky after a while? good idea otherwise though.

[Jordie]

I cant see where you would get any oil leaking into it from that end?

only if the rocker gasket went i suppose and it run all over the place.....

[Grayedout]

Won't get oil in it but there is a chance of dirt, grit, stones and all sort of rubbish getting in there !!

Okay on a race car on a smooth clean track that gets stripped every few meetings but would not recommend it on a road car !

[Xiao_Bin]

I imagine you could always drill it and plug those holes with plastic cap
so you'll keep some weight reduction factor and C**p out

yeah i'm crazy

Edited by Xiao_Bin, 28 April 2007 - 10:07 AM.

[Road Runner]

to be honest I have not seen that many race cars with it done, it will letout the dust from the clutch and cool it to a certan extent but the drawback is dirt and water can get in even on a race car but on the road this will be worse. I doubt it makes that much differance and is only astetic. If it had of been any good the the works cars fom the 60's would have found out and it would have been a common thing even down to it been offerd and a mod through S/T

[Retro_10s]

slightly Off topic I know but...mentioning dirt and grit,...on the old works cars if the clutch was slipping, a quick fix was to throw a handful of sand/grit into the clutch housing!!!

[Big_Adam]

slightly Off topic I know but...mentioning dirt and grit,...on the old works cars if the clutch was slipping, a quick fix was to throw a handful of sand/grit into the clutch housing!!!

Were as with modern cars you have to pay some snotty little git a large sum of money to fix it as it all "special" tools.

[cooperlooper649]

I've got mine drilled on my 1430 and have never had any problems.
It looks cool and obviously can release heat and dust from the clutch housing. The only way oil could contaminate your clutch is via the rear oil seal behind the flywheel, but this can happen whether there is holes in the housing or not.
I only did mine because i saw it on a race car and thought it was cool though, nobody advised me to do it.

[Bill USN-1]

I think there is a tech article on minispares written by Calvers that specifically addresses this.

I was researching the primary gear bushing tolerances and he gave the specs for street and race,
Also mentioned excessive heat during racing as a probable cause for the top hat bushing failure.

Drilling the cooling holes in the clutch cover was one recommendation for performance engines and clutches.