clutch pressure plate part totally confusing for ordering

673 Views 5 Replies 3 Participants Last post by steves280, Nov 20, 2004

briann510

Discussion Starter · Nov 20, 2004

i have a 73 240z with a 79z 5 speed and 225mm flywheel currently in car.

if i go to MSA's site and order a Centerforce ll or DF pressure plate (225mm) for a 70-74, they said i have to use a longer clutch collar from a 280z. if i order CF pressure plate for the same 225mm flywheel for a 75-79 280z they say i dont need a longer clutch collar, yet the CF part numbers are exactly the same for the 2 sets of years. is it a transmission type issue here, say 4 speeds of earlier years as opposed to 5 speeds of later years?

why would earlier year cars (70-74) with same size 225mm flywheel as the later 75-79 280z's also with a 225mm flywheel need 2 diffferent length clutch collars when using same exact part number pressure plates? maybe because earlier 70-74 z's were 4 speeds with a shorter collar and later 5 speeds had the longer one?

it is very confusing, and talking with Summit, MSA, Nopi and several others they are about as confused as i am. im just about forced to use a 225mm flywheel cause no one has a 240mm aftermarket one in stock (at least one around 12 lbs. i dont want a 8 lb'er like fidenza sells.

if i go to a 240mm then all of the above questions and confusion is a mute point.

thanks and sorry for the long post, but im pretty darn confused here on all this.

Post Edited (Nov 19, 5:31pm)

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blue

· #2 · Nov 20, 2004

Re: totally cutch part confused for ordering

tech info here <http://www.zparts.com/zptech/articles/trans_swap%20parts/4tobear_specs1.html>

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briann510

Discussion Starter · #3 · Nov 20, 2004

Re: totally cutch part confused for ordering

That was exactly what i was looking for. so if they swapped everything over then it should already have the longer collar off of the 79 they swapped in.

i need to contact the previous owner now that swapped the tranny and see if he used "everything" from the 79 z they parted. im hoping they did.

thanks

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blue

· #4 · Nov 20, 2004

yup, I have not done a transmission swap (yet) but from what I read, the transmission and collar have to match.

You may want to look into installing a 240SX 5sp transmission. Many have done it but it has not been documented much yet.

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briann510

Discussion Starter · #5 · Nov 20, 2004

the tranny thats in there now is fine. i have to start watching costs anyway with the stroker being done right now.

thanks for your info.

Post Edited (Nov 19, 6:08pm)

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steves280

· #6 · Nov 20, 2004

The throwout bearing collar matches the CLUTCH, the tranies are all the same. If you install a 280Z clutch into a 240Z with the original 4 speed, you use the longer 280Z clutch throwout bearing collar. If you use a 240Z clutch with an 82 ZX 5 speed, you still use the short 240Z collar. If you use a 2+2 240mm setup with any tranny, you need the 2+2 collar.

You wrote:

if i go to MSA's site and order a Centerforce ll or DF pressure plate (225mm) for a 70-74, they said i have to use a longer clutch collar from a 280z. if i order CF pressure plate for the same 225mm flywheel for a 75-79 280z they say i dont need a longer clutch collar, yet the CF part numbers are exactly the same for the 2 sets of years.

What they are saying is, if you install this clutch into a 280Z, it already has the longer 280Z collar so you don't have to buy one. If you are replacing a 240Z type clutch, you need a 280Z length collar. The fingers on a 240Z clutch are bent back towards the throwout bearing while the 280Z clutch the fingers are flat. That's why the collar is longer on a 280Z. It's not that complicated!

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