Slant Six Forum
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Clutch issues
https://slantsix.org/forum/viewtopic.php?t=43681		 Page 2 of 6
Author:  DusterIdiot [ Thu Feb 17, 2011 9:30 pm ]
Post subject:  Same as usual...
Quote:
How the heck do Spec's products hold up behind V8s and such??
It's hard to tell on that one, I slipped in on a Ford 5.0L forum and did some searching and they don't post anything about withering out, but
a few of them with high HP builds have fragged the pressure plate (no pics
of the bellhousing trauma). Didn't see much in the Chevy forums, import guys depending on what size shovel you use have either been pleased with their "super twin" clutch, been fine with the regular pressure plate, or are the few that fragged the unit.

I'd like to see a unit tested on a 440 car with the 11" option to see if their money is where their mouth is.

-D.Idiot
Author:  Joshie225 [ Fri Feb 18, 2011 11:19 am ]
Post subject: 
OK, I spoke with Jeremy at Spec again. He seems genuinely willing to help. The 9.5" they offer requires the flywheel to be redrilled. He says they've sold 20 Stage 2 slant six clutches and had problems with 2. He's also sold Stage 1s and 3s and not had problems with those.

I'm going to have Spec build a 9 1/4" 6-puck disc to pair with my NOS Weber cover. Does anyone know the total thickness of the original clutch disc? The FSM shows the facings are .125" thick, but I don't know the thickness of the carrier so I can arrive at the total plate thickness.
Author:  Dart270 [ Fri Feb 18, 2011 12:52 pm ]
Post subject: 
I think I bought a stage 1 and stage 2 and have not used either yet. My guess is the reason they haven't heard are that either people haven't used them yet, or they're on almost stock motors.

I guess I will try it and see. My new motor should be around 300 ft-lbs, but I will not be doing high RPM clutch dumps.

Lou
Author:  Rick Covalt [ Fri Feb 18, 2011 1:44 pm ]
Post subject: 
Josh I'm glad they are willing to help but if I have to redrill the flywheel anyway, I'd go with the one from McLeod that I know works great. Greg also has a different McLeod than Ryan that works well too.

Is their bolt in Slant 6 one for a 9 1/4" ?? Or is it 10" ??


Hope it all works out,

Rick
Author:  Joshie225 [ Fri Feb 18, 2011 2:38 pm ]
Post subject: 
Rick,

Is the McLeod unit a diaphragm type? The Spec clutch diaphragm unit is actually about 8 7/8"/225mm. The 10" Borg and Beck bolts directly interchanges with the 9 1/4".

I'm thinking at this point we should start a clutch FAQ and list all the currently available stock replacement 9 1/4 and 10" clutches followed by the bolt-in upgrades and the modified flywheel upgrades. I'd be happy to compile this information. I'd also like to have people's product experiences. Such as Duster Idiot's Spec Stage 2 not withstanding 4500 RPM dragstrip launches.

This might end up looking like the oil pump gear failure matrix or my carburetion article.
Author:  DusterIdiot [ Fri Feb 18, 2011 7:04 pm ]
Post subject:  Aye!
Sounds like a good plan.

Not to hi-jack the thread, does anyone know the part number for the pressure plate ARP bolts for our rigs since we use the 5/16"-18 bolt, not the 3/8" bolt like the V-8's use? When I stuff the Stage 4 in the car, I'd like to use something other than a stock bolt...

-D.idiot
Author:  Rick Covalt [ Fri Feb 18, 2011 8:09 pm ]
Post subject:  Yes
Josh The PP we used is a Webber Diaphragm unit we bought through McLeod. It was specifically recommended by Red himself. I Believe it was originally for a Pontiac Fiero. I believe it was 9 7/16" diameter. I will check on the details and get you the part numbers

Rick
Author:  Dart270 [ Sun Feb 20, 2011 5:19 am ]
Post subject: 
IIRC, the Wilcap alum flywheels we had made a few years ago also had this Fiero pattern on it. Greg O??

Lou
Author:  Greg Ondayko [ Sun Feb 20, 2011 7:28 am ]
Post subject: 
Quote:
IIRC, the Wilcap alum flywheels we had made a few years ago also had this Fiero pattern on it. Greg O??

Lou

Only if the Fiero Pattern is the same as the 10" ford PP cover - That's what the wilcaps have on them.


Greg
Author:  1974duster kev [ Sun Feb 20, 2011 8:18 am ]
Post subject: 
well, I had the car on the lift yesterday the front seal of the trans is leaking a ton of gear oil everywhere (clutch slippage problem?)

I called spec clutch again the other day and I was still told they don't make a stage 5 super clamp option but he was very sure if i send them my flywheel they can build me a new pattern clutch to hold 500ft lbs which is fine and dandy but of course after i got off the phone i remebered, I sent them my dam flywheel the first time and i know i was promised 450ft lbs of holding power because i would have not ordered the dam thing they told me i had the baddest cluch they make and thats the only reason i ordered it because at that time i was planning nos for the old motor and maybe a turbo motor someday. Yet when i was on the phone matt was telling me i probably have a stage 3 clutch that is only rated for 300ft lbs or something and when i asked them to lok up my order they have my name on file but can't find my order.

Kev, Spec is annoying me
Author:  Dart270 [ Sun Feb 20, 2011 9:46 am ]
Post subject: 
Yuck.

Lou
Author:  Joshie225 [ Sun Feb 20, 2011 11:36 am ]
Post subject: 
Kev,

My Stage 3 is supposed to hold 380 ft/lbs torque. My simulation shows 260 ft/lbs so I allegedly have 46% excess capacity.

Gear oil on the clutch is going to cause problems. You can clean the flywheel and clutch cover, but the disc will have to be replaced.

I was looking at my Wilcap flywheel and comparing it's second bolt pattern to the Ford 10/10.5" in this Centerforce chart and they don't match. The Wilcap flywheel has the paired holes on 3" centers and the Centerforce chart shows 3 1/8". Has anyone bolted a Ford clutch cover to their Wilcap group-buy flywheel?

Image
Author:  Rick Covalt [ Sun Feb 20, 2011 11:48 am ]
Post subject:  Details
Here is the post from 2002 when we installed Ryan's clutch & PP with the Part numbers. The Fiero and Ford are different patterns (I think) Also remember that the Clutch disc we used is no longer available. But they can rebuild it for us.

Rick
Quote:
That 's correct Lou. Here are the part #'s again. I did go directly to McLeod because I had a lot of technical questions I wanted to ask before I ordered. Is it cheaper to go through a supplier than going direct to them?

Flywheel - Dual patterns / No part # / custom order / Approx. 30 pound
About 2-3 weeks delivery / Cost $300

Pressure plate - Webber part # 360131 / 9-11/16" , 1.500" finger height
Cost $135

Clutch Disc - Dual Performance- Part #260804 / 9.5" / Cost $110


I am using the car Aluminum Belhousing and 4-speed OD. Tranny.

The Hydralic T.O. bearing is available, and certainly would make things easier as far as the linkeage goes, but its another $300 bucks?? Also You may need a spacer to move the TO. bearing forward.
There was not enough adjustment in the stock clutch adjuster to get the T.O. bearing against the diaphragm spring. And when you pushed in the clutch pedal the clutch fork was at such a bad angle it looked like the arm was going to come off the T.O. bearing. So I simply unbolted the L bracket the arm pivots on and moved it forward with spacers (flat bar) about 9/16". Actually I was able to do this with the tranny still in the car. There is just enough room to get that big of a spcer into place and still get the clutch arm hooked back over the T.O. bearing clips.
One other thing if you are running the 6 into 1 Mopar header, is that I had to rework the Z-bar to clear the headers. I had to put a dogleg in it that moved it approx. 1" towards the drivers side. This put a little worse angle on the adjuster link, but it all works fine. This P.P. pushes extremely easy. When I took it to get exhaust put on, the guy said "man I think you need to adjust your clutch" It just pushed so easy he thought something
was wrong.
This is in a 72 Swinger

Thanks,
Rick
Author:  ryandcovalt [ Mon Feb 21, 2011 10:26 am ]
Post subject: 
I bet I have much closer to 100 1/4 mile passes with slicks on my clutch and over 10000 miles street miles on it. At mason dixon test and tune night i ran 9 passes basically back to back in one night, with no issues. That clutch still holds great, and last we had the engine out the clutch disc still looked good. We really need to find like that to work with. I think a clutch matrix is a great idea too, and could help us remember all the part numbers we tried in the past.
Author:  1974duster kev [ Mon Feb 21, 2011 4:45 pm ]
Post subject: 
Called spec again today talked to Jeremy doesn't sound like their gonna do much for me he does want me to send him some pics of the clutch and measure the thickness of the pressure plate, OH and he did find my oder and i do have a stage 5 9 inch clutch with the super clamp and its rated for what did he say 480ft lbs at the flywheel. Apparently my order was an RMA and not an order or something who knows wish they would just came out with that earlier lol. I knew i wasn't crazy geez so to the real thing thats on my mind. I think i wanna go for a t56 swap anybody help me out with what parts need to be changed such as flywheel and what clutch to order and will quicktime be able to make a bell for a t56 to bolt to my slant, I'll make the trans fit reworking the floor and whatever else, just not sure what all is gonna have to change. Whats the point of doing this stuff if i don't make the car how i want it i know if i go for the t5 ill be like dam i sure would like a 6 speed. I'm just driving the car real easy to keep the clutch together while i save my pennies and thoughts

Kev, Still kicking around ideas
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