 My Six Conversion, Clutch, Pressure Plate, and Flywheel |
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| Ericv1 |
 Feb 15 2010, 07:24 AM
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#1
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Member  Group: Members Posts: 259 Joined: 30-December 07 From: Cincinnati, Ohio Member No.: 8,518 Region Association: Upper MidWest  |
O kay, this is the year I start and complete my conversion. The first initial question involves the clutch disc and flywheel. I have a 69 S-Spec engine with a 225mm clutch disc and flywheel. The transmission that it was mated to most recentley was a 901 from a 1970 911. Is this too big for a 914 gearbox. They are also 901's if I remember correctly but are 215mm. Thanks, any help is appreciated. (IMG:style_emoticons/default/smile.gif)
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| Mark Henry |
Feb 15 2010, 07:56 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
The stock '69 flywheel/clutch is 215mm and is a direct bolt on to a 901.
The S spec engine will put out about 160-170hp so this flywheel is perfect. You may have a '71 pressure plate/ clutch assembly. Is it push or pull and do you have a picture? |
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| SLITS |
Feb 15 2010, 08:07 AM
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#3
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
If it was mated to a 911/00 transmission ('70 - '71) only, you can use the package you have, but the transmission will have to be converted for use in a 914. You flip the ring gear, have it converted to a side shift and add the 914 tail cone. This gives you the ability to use the 225 mm clutch. Retail on the clutch package for this unit is $800.
Other than that, as Mark says, use the early 215 mm flywheel and a stock 914 transmission. |
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| Ericv1 |
Feb 15 2010, 08:19 AM
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#4
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Member Group: Members Posts: 259 Joined: 30-December 07 From: Cincinnati, Ohio Member No.: 8,518 Region Association: Upper MidWest |
QUOTE(Mark Henry @ Feb 15 2010, 08:56 AM)  The stock '69 flywheel/clutch is 215mm and is a direct bolt on to a 901. The S spec engine will put out about 160-170hp so this flywheel is perfect. You may have a '71 pressure plate/ clutch assembly. Is it push or pull and do you have a picture? Hi Mark, It's a "pull style" throw out bearing that is mounted to the pressue plate. From what I've read, they only went with this setup in 1970. So, if I have a 70 flywheel, I need a 69 correct? Thanks. |
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| Mark Henry |
Feb 15 2010, 11:11 AM
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#5
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Yes the 911 '69 assembly then it's a total bolt on for the 914-901.
I'm not 100% but I think the clutch is just a stock 914/4. I have this full setup ('69 flywheel, PP and disc and hardware) in the for sale section. PM me if interested. Attached image(s) 
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| SLITS |
Feb 15 2010, 11:57 AM
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#6
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
QUOTE(Mark Henry @ Feb 15 2010, 09:11 AM) I'm not 100% but I think the clutch is just a stock 914/4. Close enough if you use the 914 2.0L clutch. It is the same as the 914/6 clutch except the pressure plate on the 914/6 was rated at a few more pounds of clamping force. |
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| Rav914 |
Feb 15 2010, 02:10 PM
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#7
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All-weather fan Group: Members Posts: 738 Joined: 15-April 07 From: WA Member No.: 7,669 Region Association: None |
QUOTE(Ericv1 @ Feb 15 2010, 05:24 AM) I have a 69 S-Spec engine.... That is going to be nice. |
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| Cap'n Krusty |
Feb 15 2010, 02:58 PM
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#8
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Just so you know, if you convert the 911 tranny for use in a 914, you'll have to use a different clutch cable. I believe I used one from a '72 911. You can also modify a 914 tranny to work with the '70-'71 225 mm 911 clutch by moving the pivot pin to the 911 location. This is a bit difficult, but it CAN be done on a vertical mill. Still need the cable. BTW, the last release arm I bought was the last one in the Porsche inventory, and it was close to 300 bucks. They're a wear item.
The Cap'n |
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| Ericv1 |
Feb 15 2010, 06:53 PM
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#9
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Member Group: Members Posts: 259 Joined: 30-December 07 From: Cincinnati, Ohio Member No.: 8,518 Region Association: Upper MidWest |
QUOTE(Rav914 @ Feb 15 2010, 03:10 PM) QUOTE(Ericv1 @ Feb 15 2010, 05:24 AM) I have a 69 S-Spec engine.... That is going to be nice. I can't wait. I had it running this summer in the 911 and it pulled strong in that car up to 7,000 rpms. It most likely would have went further but I did not want to push it. Thanks everyone for the input. I'll probably get an earlier flywheel as that is the simplest solution. I can then use my pressure plate and disc which don't have much wear on them. |
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| jt914-6 |
Feb 15 2010, 07:57 PM
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#10
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Driving & working on teeners 41 years Group: Members Posts: 1,786 Joined: 3-May 08 From: Bryant, Arkansas Member No.: 9,003 Region Association: South East States |
QUOTE(Cap'n Krusty @ Feb 15 2010, 02:58 PM) Just so you know, if you convert the 911 tranny for use in a 914, you'll have to use a different clutch cable. I believe I used one from a '72 911. You can also modify a 914 tranny to work with the '70-'71 225 mm 911 clutch by moving the pivot pin to the 911 location. This is a bit difficult, but it CAN be done on a vertical mill. Still need the cable. BTW, the last release arm I bought was the last one in the Porsche inventory, and it was close to 300 bucks. They're a wear item. The Cap'n I've got a 914 tranny that has the pivot pin relocated. Just have the case only. Also have the 911 cable, pivot arm bolt and arm. All bought new and with little use. Would make someone a deal on them..... |
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| zig-n-zag |
Feb 15 2010, 08:51 PM
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#11
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Member Group: Members Posts: 182 Joined: 18-May 06 From: Hawaii Member No.: 6,024 |
Do you need to change the guide tube to 911 and will
the 914 clutch pedal shaft work or does that need the 70-71 911 clutch pedal shaft as well? |
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| Eric_Shea |
Feb 15 2010, 10:18 PM
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#12
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
I have that tranny. Flipped R&P. Short gears. Side Shift. 914 Nose Cone. 75 Clutch Cable. 225mm clutch and PP. 2.5L six.
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| jt914-6 |
Feb 16 2010, 06:15 AM
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#13
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Driving & working on teeners 41 years Group: Members Posts: 1,786 Joined: 3-May 08 From: Bryant, Arkansas Member No.: 9,003 Region Association: South East States |
QUOTE(zig-n-zag @ Feb 15 2010, 08:51 PM) Do you need to change the guide tube to 911 and will the 914 clutch pedal shaft work or does that need the 70-71 911 clutch pedal shaft as well? Yes, I did change the guide tube and it is still on the converted nose cone. I did also change the clutch pedal shaft as well. It is still on the car. There is a difference in the angle of the shaft between the 914 & 911..... |
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