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Holden V8 Flywheel - Will it take an 11 inch pressure plate?


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#1 HNSGEQ

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Posted 19 January 2021 - 10:45 AM

Hi All,

I've done a search and couldn't locate anything so thought I'd ask.

 

Does anyone know whether I can get a Holden V8 Yella Terra Steel Flywheel drilled to accept an 11 inch pressure plate?

 

I'd like to run a bigger diameter clutch and pressure plate if possible.

 

If it is possible, would anyone know who could drill and tap the flywheel and balance it?

 

Thanks all,

George



#2 76lxhatch

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Posted 19 January 2021 - 11:43 AM

You could give it a go but assuming 0.5" wider bolt spacing (0.25" closer to edge) the bolt threads would be extremely close to the out edge of the flywheel (like 1.2mm at absolute most). The bolts would have to have relatively small heads (e.g. cap head) and the starter would probably need to be one without a pinion support (many high torque starters are like this) so the overhanging cover plate doesn't hit it. You could of course machine the cover plate edges down a bit but I think the bolt heads would still hang over a touch, might clear OK.

 

However depending on which weight Yella Terra flywheel you're talking about there may not be room for re-drilling at all due to the machined areas. Bear in mind when they say standard or light weight they appear to be talking about OEM Chev (which the flywheels are presumably based on) weight rather than Holden V8 - the standard weight one is heavier than standard, the first light weight one is roughly factory weight and has the outer edges machined down around the bolt holes.

 

I spent a while looking for better clutch options, used one that was ceramic on pressure plate side for a bit but lifetime was very short in comparison to organic. In the end I've got a twin plate McLeod RST unit (full organic facings) which bolts straight on like a normal 10.5" would. It has solid centre discs but this hasn't been an issue, it drives pretty close to a standard clutch (just a little less forgiving if you get the bite point wrong). So far so good and definitely not as easy to spin up even with slicks fitted.

https://www.summitra...913-07/overview

Photos of mine here:

http://www.gmh-toran...15#entry1027214



#3 yel327

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Posted 19 January 2021 - 01:01 PM

Rod shop do a modified SBC flywheel to 308 to suit an LS clutch. Maybe see if they can help.
https://www.rodshop....ll-housing.html

If you are using a SBC 11” flywheel you may have to muck around with starter motors too.

Mal Wood looks like they do a flywheel to suit your needs anyway:
https://malwoodauto....illet-flywheel/

#4 HNSGEQ

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Posted 19 January 2021 - 04:15 PM

Thanks both.

 

I already have a Yella Terra 308 steel flywheel so would like to use that with an 11 inch clutch if I can, rather than buy a Mal Wood steel flywheel.

 

Cheers.



#5 dattoman

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Posted 19 January 2021 - 08:34 PM

Why the desire to step up to 280mm ?

Standard offerings nowdays for 308's are 263mm

 

Might come close to the edge



#6 HNSGEQ

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Posted 20 January 2021 - 10:01 AM

Hi Dattoman.

I want to run more clutch surface is the reason behind wanting to run an 11 inch clutch on a Holden V8 flywheel.

 

I'm looking for a pedal that has a light "feel" so don't want to go too heavy a pressure plate and if I can get more clutch surface with a little less pressure, I'm hoping it would give me the desired result.

 

That's my thinking anyway......



#7 Bigfella237

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Posted 20 January 2021 - 11:41 AM

More surface area is exactly what a twin-plate clutch gives you, without the extra diameter or hassles of modifying your flywheel.



#8 dattoman

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Posted 21 January 2021 - 01:03 AM

Yep I'd def be looking to convert a twin plate

 

http://npcperformanc.../51/Twin-Plates



#9 yel327

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Posted 30 January 2021 - 02:33 PM

I was just reading some old Press releases, and stumbled upon the Press Release for GMH V8 in Bedford. It state that these run a bigger flywheel that takes a 12” clutch plate. Should be some still around in wrecking yards. Will get you a part number too.

#10 ozyozyozy

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Posted 31 January 2021 - 09:42 PM

Be better off going to a 9in twin plate, more surface area, light pedal feel and lower moment of inertia.

#11 Shiney005

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Posted 01 February 2021 - 10:28 AM

I was just reading some old Press releases, and stumbled upon the Press Release for GMH V8 in Bedford. It state that these run a bigger flywheel that takes a 12” clutch plate. Should be some still around in wrecking yards. Will get you a part number too.

This is the low compression L43 as fitted to the Beddy's. You can just about read the part number on the flywheel. It does look bigger than standard.

Attached File  Beddy flywheel.PNG   1.91MB   5 downloads



#12 rexy

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Posted 01 February 2021 - 01:49 PM

Would it need a compatible bellhousing for clearance and starter position?



#13 yel327

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Posted 01 February 2021 - 02:17 PM

They were all TH pattern to suit Eaton transmission. The bellhousings would be cast steel to suit side mounts like a ‘57 Chevy, or FJ Landcruiser, and you can see the starter mount in that picture. It may not be an L43 in that image, there were both low comp 4.2 and 5.0L engines. They replaced the Bedford and Chevrolet straight 6 engines. They are basically blue type engines with HEI dizzy, just full of HD components and introduced well in advance of VC and WB.




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