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03-23-2006, 09:46 AM
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CC Member
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Join Date: Feb 2006
Location: Lugo,
LU
Cobra Make, Engine: Backdraft
Posts: 118
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Not Ranked
Scattershield for a 302 ¿neccesary?
Hi Guys! I've been reading posts related with sccatershields, clutch explosions...etc. My BD is on the boat and the next month Jay in Vintage will finish it with a 302-345 bhp ans a WC-T5 trans and standard rear. Jay said to me that they use to install scattershield in more radical engines. I will use my car for street and weekend (perhaps a little bit hard driving but not racing). I could upgrade bellhousing to a steel one, but I only want do it if neccesary....Your oppinion? Once the car in Spain it will be difficoult to make modifications...so please tell me all you consider important!!
Thanks
Alfonso
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03-23-2006, 11:45 AM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
If you don't turn the engine over 5,500 rpm and the flywheel is free of even the smallest cracks, as in heat checks, you should be OK. Tapered steel flywheels--thinned at the ring gear--with small-dameter clutches don't need scattershields. Tilton and Quartermaster supply these assemblies.
Caution: This doesn't apply to plain cast-iron flywheels. Nodular ci flywheels are OK if they are in good shape.
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
Last edited by speed220mph; 03-23-2006 at 11:47 AM..
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03-23-2006, 12:14 PM
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CC Member
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Join Date: Nov 2000
Location: Tucson,
Az
Cobra Make, Engine: Superformance 427 Side-Oiler
Posts: 2,156
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Not Ranked
[quote=speed220mphTapered steel flywheels--thinned at the ring gear--with small-dameter clutches don't need scattershields. 
[/QUOTE]
This is completely false.
__________________
The rest of the world can have their opinion about the United States just as soon as WE give it to them.
Last edited by Cobrabill; 03-23-2006 at 12:17 PM..
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03-23-2006, 01:45 PM
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CC Member
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Join Date: Mar 2004
Location: Corning,
ny
Cobra Make, Engine: A&C,351W
Posts: 186
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Not Ranked
I asked the same question when I started my cobra. I had a very nice stock bell already and didnt want to spend the time and money on the scattershield.
One of the replies I got just asked "what value do you put on your legs". Had a quick look at just where things would actually be located in the car in relation to my legs and immediatly purchased the scattershield.
You only get one pair of origionals.
Good Luck,
Aaron
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03-23-2006, 05:24 PM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
Quote:
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Originally Posted by Cobrabill
This is completely false.
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Cobrabill: Explain yourself, please. 
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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03-23-2006, 08:11 PM
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CC Member
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Join Date: Nov 2000
Location: Tucson,
Az
Cobra Make, Engine: Superformance 427 Side-Oiler
Posts: 2,156
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Not Ranked
No clutch disc/pressure plate/flywheel is immune to failure.
I had a clutch let go in my HEMI GTX years ago.The following was the result:
Disc-completely gone
Pressure plate & springs-completely gone
PP cover-torn and stretched to over 20 inches
Bell housing-all missing but a chunk the size of my fist where the Z bar attached and several quarter size pieces where it bolted to the block.
Inspection cover-gone(obviously)
Hole in the back of a valve cover
Lower corner of the block broken off
Front bearing retainer broken.
So....when you get a scattershield,make it a Mcleod.Lakewoods are worth the hassle.
__________________
The rest of the world can have their opinion about the United States just as soon as WE give it to them.
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03-24-2006, 06:42 AM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,115
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Not Ranked
Cobrabill,
How many years ago? What condition where the parts involved, all new and when were they produced? Used? What power levels are we talking with that Hemi? What RPM and what environment did it let go?
Just getting some more perspective thanks.
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03-24-2006, 06:53 AM
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CC Member
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Join Date: Nov 2000
Location: Tucson,
Az
Cobra Make, Engine: Superformance 427 Side-Oiler
Posts: 2,156
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Not Ranked
Shiiiiiiiiiiiiiiiiiiiiiit-i can't remember what i had for dinner last night. 
This was the late Seventies.It had a cam but that's about it.The parts that let go were in the car when i bought it and there wasn't anything left to I.D.
Possibly a Scheifer.But i really don't know.
__________________
The rest of the world can have their opinion about the United States just as soon as WE give it to them.
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03-24-2006, 07:59 AM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
Cobrabill: I see you have had personal experience with a clutch/flywheel failure, but it was with a large diameter flywheel and clutch. The HEMI GTX didn't use a small clutch or flywheel. I've also had many experiences, but mine have been with hardcore racing. Yes, I've had the disc shed its flacings during a 7,500 rpm shift, but that's not what we're talking about.
You're right, no clutch disc, pressure plate or flywheel is immune to failure, but if the right components are used--I was speaking of small-diameter clutches of under six inches and light, flex-plate style pressure plate--the chance of failure is so low it becomes insignificant providing the components are installed correctly. I am not saying this without base, having designed or cooperated on the design of all types of cars, from Indy, TransAm, Pro Stock and off road, to name a few. Check out the setup Olthoff's use in their Superformance clutch and flywheels. I have seen many nasty stuff when acting as an expert in may cases involving clutch/flywheel failures. But in all my travels within racing circles and litigations, I've never seen a clutch such as the type I have mentioned fail due to centrifugal forces.
By the way, I have a Lakewood b/housing fitted to the back of my 427 s/o.
Here's a picture of a '40 Ford Gasser with a sb Chevy in that had a flywheel come apart during an 8,000 rpm shift. This was in the early days when scattershields were not required. This is why NHRA institued the requirement.
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
Last edited by speed220mph; 03-24-2006 at 08:05 AM..
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03-24-2006, 03:04 PM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,115
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Not Ranked
See the clutch explosion stories always start with .... "back in the 70's" or "fat slicks on the back" etc. This is what I was getting at.
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