Wanted input on 7.25 clutches for imca style stock car

[Xtremeracing]

Just wondering what is best single, double, or triple, and if these clutches are rated for hp or toque. Will be running a flat top 360 under new imca stock car rules with a 500 holley. Just wondering if that xtra weight is needed or not. Also what good brand plan on buying one.
Thanks in advance.

[dynoman14]

I ran Tilton and Quartemaster double and triple disk clutches on my 800hp 550ft/# ARCA engines and ran them 3 races and serviced them. Grind sliders and install new discs. I know racers that have run them 2-3 years on pavement. I would not run a single disc anything on a race car if rules allowed multiples. Unless you watch and replace the disc regularly they don't have a lot of surface to get the job done.

Like anything else dirt kills them so I would recommend cleaning every 5 races until you figure out how often you need to service them. If you can seal your bellhousing to keep dirt out that would probably help, also washing the car down with a pressure washer is not great for the clutch.

These can be picked up on e-bay for about $150-$200 but many are junk. I would buy from an individual that ran one maybe racing junk. I have sold them complete and race ready for about $500 and new they are about $1000, depending on options. Most are fine spline for Jerico's / T-10's/. All you have to do is buy coarse spline discs and swap out.

For an IMCA car I would buy a 10" flexplate ( aluminum ?) to start the engine with as the flywheel and then use a hydraulic TOB to actuate the clutch. The TOB is going to cost $50-$250 depending on how good of a deal you can find. If you don't use the makers flywheel you will have to buy a button flywheel which a smaller backing plate that takes the place of the flywheel surface for the disc to engage to.

If you can't find one and need one, I got them...not cheap but it will be right when you get it.

[stock car driver]

I ran used 3 discs from ebay and put new discs in them as needed. I easily got 20 plus nights on discs.

I have a 3 night old single disc 7.25 quarter master here for sale... that is what you want, the disc in the single has MORE surface area than the discs on double and tripple as well as more material to wear by more than double..... They have got plenty of holding power and are only 8-9lbs over the used stuff I was running at 15-16lbs.

Also you just run a stock oem flexplate with this clutch I have no idea what all that garble dynoman is babbling about above.

$300 clutch
$100 brg
$100 scat shield

[parrot69777]

First off I have never seen an aluminum flex plate. Wouldn't want to run one if they did make such a thing as it would probably come apart.

I can't understand how a 7.25" single disc has more area than a 7.25" triple disc? Obviously the triple has 3 times the surface and has more spring pressure to make the clutch engage tighter as RPM increases.

[stock car driver]

I can't understand how a 7.25" single disc has more area than a 7.25" triple disc? Obviously the triple has 3 times the surface and has more spring pressure to make the clutch engage tighter as RPM increases.

I dont know why you seem to follow me around on here and want to argue about things you clearly have no clue about.

there is more clutch surface area on the single disc and the material is much much thicker, if you held both in your hand EVER you would know, if you called quarter master you would also know.

The discs ARE NOT the same for 2/3 and single disc from quarter master.

[dynoman14]

NHRA has been running aluminum flex plates for about 20 years and they are SFI Approved, super stocks turn 9500+ rpm with them no problem...are you scared of running aluminum driveshafts too ???
The MOI on the flexplate -vs- flywheel ( for a couple hundred bucks ) is like taking 5# off your crank.

http://www.reactorproducts.com/

As far as my babble on the flex plate, if you do not use the standard flywheel that comes with the 2 and 3 disk clutches, you are removing the rear surface for one of the discs, so you have to use a replacement backing plate to get the clutch to engage and it is called a button flywheel because it is way smaller.

Our quartermaster discs are all the same thickness as they start life about .135" friction material and have to be replaced when they get down less than .100" . The main difference is a single uses the middle of a 3 disk and a 2 disk uses the front and back of a 3 disk, and a triple uses all 3.

There are some aftermarket companies that make replacements that are thicker, but I have never used them.

[stock car driver]

NHRA has been running aluminum flex plates for about 20 years and they are SFI Approved, super stocks turn 9500+ rpm with them no problem...are you scared of running aluminum driveshafts too ???
The MOI on the flexplate -vs- flywheel ( for a couple hundred bucks ) is like taking 5# off your crank.

http://www.reactorproducts.com/

As far as my babble on the flex plate, if you do not use the standard flywheel that comes with the 2 and 3 disk clutches, you are removing the rear surface for one of the discs, so you have to use a replacement backing plate to get the clutch to engage and it is called a button flywheel because it is way smaller.

Our quartermaster discs are all the same thickness as they start life about .135" friction material and have to be replaced when they get down less than .100" . The main difference is a single uses the middle of a 3 disk and a 2 disk uses the front and back of a 3 disk, and a triple uses all 3.

There are some aftermarket companies that make replacements that are thicker, but I have never used them.

You are wrong on almost all the above.

A quartermaster clutch that is a single disc shares no PART of a 3 disc except the fly wheel...

It does NOT use the middle disc, the clutch material isnt even the same stuff, there is absolutely no comparison as they are built completely different. A single disc has clutch material attatched where a 3 disc has a thin coating of material stuck to the plates.


In street stocks we run button clutches, they are sold to be used with a FLEX plate, they have the button flywheel built in.

Please go stick with the b.s you post in the crate forum as you are clue less when it comes to this stuff.

[dynoman14]

Mr.Genius street stocker,

I have been building clutches longer than you have been racing. I guess if it shares the flywheel the rest of the stuff might just bolt right up if you know what you are doing.

It is called individual thought, creativity or just basic know-how...that is how things get invented.

Just cause the catalog don't list it does not mean it can't be built. Putting together a LW Q'master clutch does not mean the one you buy from the book. A fabbed single disc clutch from LW 7.25 is almost 1/2 the weight of the standard clutch you buy from Quartemaster. Oops did I say something you have never seen or heard of therefore it does not exist.

Just because the part number in the QM catalog do not show commonality, I have sold 20-30 of these Frankenstein single disc clutches and have run them myself in 2-BBL pavement applications. The only thing you have to do is purchase shorter bolts to bolt them together with and shim the HYD TOB to work with the recessed diaphragm position.

BTW, if a clutch disc is 7.25" od for a triple and 7.25" od for a single have you discovered a new formula for calculating surface area that the rest of us don't know about ??? Let us in on it please.

After having you jump on my posts for the last 2 years I can't imagine why you would even ask someone else why they were following your posts on here.

[stockcar5]

lol...now he builds clutches!!

[parrot69777]

I dont know why you seem to follow me around on here and want to argue about things you clearly have no clue about.

there is more clutch surface area on the single disc and the material is much much thicker, if you held both in your hand EVER you would know, if you called quarter master you would also know.

The discs ARE NOT the same for 2/3 and single disc from quarter master.

How do you get through doors with your head that big? If there was anyone to follow around on here....it sure wouldn't be you. Hard not to post a comment...on a thread you haven't already posted on. Because you post on every one whether you know anything or not. Maybe some day you will catch up with your ego.

The only time something is supposed to be a good quality race part... is if your selling it. If you had a Tilton triple disc clutch next week for sale...you'd claim the Quarter Masters are junk....just so you could sell it.

[stock car driver]

How do you get through doors with your head that big? If there was anyone to follow around on here....it sure wouldn't be you. Hard not to post a comment...on a thread you haven't already posted on. Because you post on every one whether you know anything or not. Maybe some day you will catch up with your ego.

The only time something is supposed to be a good quality race part... is if your selling it. If you had a Tilton triple disc clutch next week for sale...you'd claim the Quarter Masters are junk....just so you could sell it.

bahaha thats some funny stuff there... I just sold 3 tiltons and 2 quarter master 3 discs, lol.

Nice try though. Until recently I had never seen the q master single disc so I had no idea about it either. Unlike you Im still learning...


DYNO- now you build clutches... funny stuff, 4 posts ago you said that we couldnt run a flex plate because the first disc would have no place to seat on,lol...

You are seriously one funny cat. For someone who claims to have all these customers on here and claims to be making a living off all your knowledge you sure do go in circles when you are wrong.

fyi the 7.25 single disc HAS more material because the material cross section is WIDER.. 7.25 od and about 5.5 id vs the 3 disc discs which have the clutch material glued or dipped on only have 7.25 od and about 6.25 id....

Since your so worried about it and your so STUPID... I will take pictures of both discs for you tomorrow or monday and post them for you here. Ill even take a picture of the flywheel we all use with a flexplate for you!!

[stock car driver]

The only thing you have to do is purchase shorter bolts to bolt them together with and shim the HYD TOB to work with the recessed diaphragm position.

You forgot to mention you have to mill off the stands on the cover so that the short bolts will even have the threads exposed, not to mention the cover kinda needs to touch the disc in order to work.

post some pics of your custom fabbed clutches please!

[powerslide]

You forgot to mention you have to mill off the stands on the cover so that the short bolts will even have the threads exposed, not to mention the cover kinda needs to touch the disc in order to work.

post some pics of your custom fabbed clutches please!

i'm sure he will after you post the pics of your single disc having more surface area than a triple disc. This is going to be good. I can understand you saying it has more material but surface area....

no makey any sense to me hillybilly boy.

[50j]

He's talking about the i.d. affecting surface area.

[stock car driver]

i'm sure he will after you post the pics of your single disc having more surface area than a triple disc. This is going to be good. I can understand you saying it has more material but surface area....

no makey any sense to me hillybilly boy.

Ive got a grand that says Dyno man posts no pictures of any such clutch hes BUILT EVER....

If you dont understand the inside diameter of the single disc smaller thus giving it more material I doubt a picture will help you.

But anyways...

single disc is 1 inch wide for clutch material.

tripple and double disc has 7/8 of clutch material.

Here are two pics....








Here is a picture of the boss that dynoman would need to also shorten for a cover to work, where he said just buy shorter bolts.