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clutch question

Sorry, I just needed to run this by someone.
I'm looking at buying a used flywheel that was run on a 71.. 6bolt.. 911 motor

seller said he ran it with a 225mm clutch application.

Am I correct in remembering that a stock 914 clutch is actually 215mm?

Is the 225mm application the one where you invert the clutch pull on the tranny?

just want to make sure I don't buy something that won't fit...

thanks all
brant
Old 12-29-2004, 10:15 AM
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Yes, the stock 914 clutch is 215 mm. Can't help you with your other questions.
Old 12-29-2004, 10:51 AM
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I'm undergoing a conversion to 2.4S 6cyl and I plan to run a 901 tranny. Basically, you (and I) have two options.
Note: This only applies if you are converting to 6cyl. 911 Flywheels do not work on T-IV engines AFAIK:

1. Get 71 911 225mm Pressure Plate since it is Push configuration and will fit 914s since 901 trannys were used until late 72 911s but, you will need to upgrade your PP and Clutch also to the same year.
2. OR You can use a 914-6 Flywheel (a pre 69 911 Flywheel will work also) so you can use your existent 215mm PP and Clutch.

Ive heard that there is a way to convert a 901 to a Pull clutch fork configuration so you can use a post 71 225mm FW and Clutch but not sure about that.

The 70-72 911 FW PP and Clutch are more expensive but easier to find than the 914 and 914-6 215mm packages but are a must if you want to run more HP. Pre 69 911 and 914-6 Flywheels are not impossible to find, just more difficult.

I suggest you look in this forum for previous threads that have extensive info on this matter. It is a pretty long thread and some of the most knowledgable guys here contributed a lot. I'll add the URL later if I do see it. Hope that helps. Good Luck and Merry Xmas.

Found the link!!!
914-6 flywheel options
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Last edited by porsche914_73; 12-29-2004 at 04:57 PM..
Old 12-29-2004, 04:32 PM
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Fred,

thanks for your time..
I know about the 2 options but didn't know which year and needed the reassurance of what the mm difference was

thanks again sir..
very helpful
brant
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Old 12-30-2004, 07:01 AM
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I believe that the 70-71 911 clutches were pull-type, so you'd need to do the conversion mentioned.

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Old 01-02-2005, 04:15 PM
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Thanks Dave:
Just to clarify, I think I have the push-pull thing in reverse...
When I mean push, i mean that the fork pushes the release bearing into the PP and viceversa. Some people refer to pushing from the cable perspective. Are we on the same note?
And finally, can you use a 225mm 71 911 FW PP and clutch on a 901 tranny or not? 916-6 FW are 215mm so you can use the same HW as any other 914. Am I correct?

Anyhow, I'm going with a 916-6 FW and standard 215mm 914 PP and clutch for now. I just wanted to get the facts straight...

Thanks!
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Last edited by porsche914_73; 01-04-2005 at 03:12 PM..
Old 01-04-2005, 03:09 PM
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Crap, now I've gotten this all twisted around in my head and can't tell which way is which!!

The 70-71 911 used a different clutch release mechanism than the pre-70 911; the 914s all used the same mechanism as the pre-1970 911. If you use a 70-71 911 clutch, you have to modify the clutch throwout mechanism but you can get rid of the pulley, I believe. Clay Perrine describes such a setup in one of his (recent) posts on a similar subject.

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Old 01-04-2005, 04:17 PM
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yep.. what dave said..

and yes then its the 225mm clutch which some say is good for high hp and other say is absolutely unnecessary for 300hp or less.

brant
Old 01-04-2005, 05:11 PM
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65-69 911, 914-6, 914-4 have a PULL type clutch. The clutch arm is being PULLED on, which in return pushes on the throwout bearing releasing pressure on the PP.

The 70-71 911 have a PUSH type clutch. The clutch arm is being PUSHED on, which in return PULLs on the Throwout bearing releasing pressure to the PP.

The difference in how the two work is in the lever action of the PP release.

65-69 911 flywheel (215mm, 6 bolts to crank), clutch disk, PP, throwout bearing= stock 914-6 flywheel, clutch disk, PP, throwout bearing.

70-71 (NOT 72) flywheel (225mm, 6 bolts to crank), 70-71 clutch disk with 901 trans spline, push type PP, throwout bearing. Esentually the 915 flywheel and old release arm mechanism working in the opposite direction.

72-77 flywheel (225mm, 6 bolt to crank) 915 box with completely different release lever actuation.

78-87 flywheel (225mm?, 9 bolt to crank) 915 box, same as 72-77.

To make the 70-71 type release arm work you will also need the 75 911 clutch cable.

FWIW, the PUSH setup is not cheaper than the Kennedy clutch setup for the 3.0 and 3.2 engines. If all your looking to do is get the 225mm flywheel and clutch for a higher HP engine, the Kennedy setup, again, is the way to go.
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Last edited by BigD9146gt; 01-04-2005 at 05:35 PM..
Old 01-04-2005, 05:29 PM
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