Some multi-disc clutches for cars will employ a similar mentality, where the disc and cover pressure plate assembly are much smaller in diameter than the flywheel. In addition to their cost, multi-disc clutches chatter and make noise frequently. While they are known for having relatively light pedal pressure, most are also relatively grabby compared to single disc clutches. So I put together a few diagrams to illustrate more clearly how some of the different clutches we sell compare to one another.
Fantastic write ups. Easy to understand and very informative, answering questions that give me peace of mind. Very informative write up and very easy to follow. Very helpful and Great information, we appreciate advice especially coming from a professional. Thanks again and keep up the great work! The engagement was a little tricky but nothing you couldn't adapt to. Best was stock pressure plate and copper puck clutch, nice and light pedal and plenty grippy and NO chance of the friction material coming apart, a failure I have had twice with regular clutches.
Make sure you get a sprung centersection. Solid disks are transmission killers. The springs take up the micro shock loads that eat gears and twist shafts. My puck disk was unsprung, I ate many many transmissions with it. I eventually deliberately scrapped it so that I wouldn't be tempted to use it again. Now I have an ACT with an organic disk and a firmer pressure plate. The pressure plate makes throwout forks crack and pivot balls break on a depressingly regular basis, even with reinforcement.
My next clutch will be a stock pressure plate and a sprung 6-puck. They sell them like that as a kit idk what they call it, stage one or something. Takes from the setup i had, grabbed like stock, felt like stock, didnt slip with ho hos unlike stock. I haven't had to do the clutch on my miata yet, so I don't have any actually experience on the matter, but when I asked before I was heavily recommended the Flying Miata Kit. They have various stages of clutch too depending on how much, if any boost, you are running.
Do understand that the magical super grabby clutch is harder to control on engagement. So don't go overboard with the likes of a true racing clutch. For a car on the street, you really want that disc waviness and such, so you can take off slowly and without lurching or spinning the tires. Judging by some of the previous replies, there is apparently a lot of misinformation out there about clutches.
Lets set the record straight All else being equal:. Less friction surface area does not change the normal force or holding power of the clutch. Surface area is irrelevant in determining the actual friction force, although the faster ramping of pressure on the friction material from the reduced surface area will cause feel more aggressive.
Reducing inertia is a good thing. However, less mass means it will heat up faster when subjected to slippage, while the reduced surface area means it will not be able to conduct the heat as quickly away into the flywheel and pressure plate. Sprung Full Face: Oem style, easiest to drive, can still hold power with the right pressure plate.
Unsprung Full Face: Slightly more difficult to drive, more noisy, but more responsive. Will hold the same amount of power as the sprung full face. Sprung 6-puck: Noticeably harder to drive but still very streetable with some practice. Excellent for drifting. Sprung 4-puck: Holds the same power as the 6-puck but much harder to drive and wears out faster, essentially no benefit in a street car. Very noisy, difficult to drive, harder on your transmission, but will allow for faster gear changes.
A twin disc clutch has a couple advantages over a single. Since there is double the amount of friction surface, the discs and pressure plate can be made smaller in diameter. This means less rotational mass in the discs and pressure plate, so you get faster revs and faster gear changes. Everything you just read about disc types also applies to twin, triple, and quad disc units.
The downsides? This means they are super light, but harder on your transmission. Essentially a round set of sprung fingers that apply a certain amount of force pinching the clutch disc between the pressure plate and the flywheel. Simply put, stiffer pressure plate equals more holding power. The side effect? There is no reason your lb-ft engine needs a lb-ft rated clutch. Now that you know all about clutch discs, you should know why a sprung 6-puck with a light pressure plate might be the ultimate daily driver clutch that holds power.
First up is the XTD system aka branded eBay clutch. How could you go wrong? Plenty of people use that clutch with great success, and good for them. I do it on the ground with hand tools, dropping the transmission on my chest while covered head to toe in grease.
They all use very high quality materials in their discs and pressure plates which lead to a clean install, long life, no premature failures, and peace of mind.
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