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> Clutch Slips on 6 conversion
Catorse
post Oct 2 2016, 03:16 PM
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So here's the deal:

- built 2.7 with Webers. All the tricks possible on this motor
- rebuilt trans
- new flywheel (not resurfaced!)
- new 914 clutch
- New TOB
- new clutch cable

Cable is adjusted so that engagement point is as close to the floor as possible. When I go above 4000 RPM, I get some serious clutch slip. So bad I can't really climb higher, although the car has a 7K limit.

I'm thinking the stock 914 clutch can't hold it, even though it is a brand new clutch. Any ideas here?

I do not believe it is making enough power to overwhelm the stock clutch, unless the stock clutch is super weak.

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Steve
post Oct 2 2016, 03:21 PM
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I ran a 2.7 with webers, headers,etc. and had no problems with the 215mm 2.0 flywheel and 2.0 clutch. Maybe you got some bad parts or got oil on the disk. I put over 100k on that clutch, up and down hills, drag racing other porsches, etc.
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Catorse
post Oct 2 2016, 03:26 PM
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QUOTE(Steve @ Oct 2 2016, 02:21 PM) *

I ran a 2.7 with webers, headers,etc. and had no problems with the 215mm 2.0 flywheel and 2.0 clutch. Maybe you got some bad parts or got oil on the disk. I put over 100k on that clutch, up and down hills, drag racing other porsches, etc.



That's what I needed to hear, Steve. I wonder if there is oil or something on it. I seem to recall a slight fluid spill on the bottom of the bellhousing. Wonder if it slung it all over the place.
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wndsnd
post Oct 2 2016, 03:30 PM
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Or the clutch is fine and you are spinning the wheels! (IMG:style_emoticons/default/smile.gif)
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Catorse
post Oct 2 2016, 03:40 PM
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Naw, got super stick Nitto Nt01, also new. No way they are spinning.
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r_towle
post Oct 2 2016, 04:21 PM
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Is the pressure plate new?
Has the flywheel ever been resurfaced?

You can get pressure plates with more force if required, racing applications.
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Catorse
post Oct 2 2016, 04:27 PM
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QUOTE(r_towle @ Oct 2 2016, 03:21 PM) *

Is the pressure plate new?
Has the flywheel ever been resurfaced?

You can get pressure plates with more force if required, racing applications.



Brand new flywheel, brand new pressure plate. I am starting to lean towards the oil on clutch theory. I recall spilling some swepco by the bell housing, not sure how much it takes to contaminate the disc but I am guessing not much.
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rgalla9146
post Oct 2 2016, 05:33 PM
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"The clutch is adjusted so engagement point is as close to the floor as possible"
Correct clutch adjustment has nothing to do with "from the floor"
Free pedal movement from the pedal top stop to resistance is the conventional measure
of clutch adjustment.
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Steve
post Oct 2 2016, 05:42 PM
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I always did the infamous 1/2" free play, pulling the clutch pedal to you versus where it rests.
I never heard of the push to the floor method. There needs to be around 1/2" free play in the cable.
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r_towle
post Oct 2 2016, 05:48 PM
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Could be a bad pressure plate too, unless you poured lots of oil on the dick
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db9146
post Oct 2 2016, 08:02 PM
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Kennedy Engineering has a 228mm set-up that they recommend for a warmed over 2.7 mated to a 901. I just went through this getting ready for my swap this fall.
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SirAndy
post Oct 2 2016, 09:13 PM
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QUOTE(db9146 @ Oct 2 2016, 07:02 PM) *
Kennedy Engineering has a 228mm set-up that they recommend for a warmed over 2.7 mated to a 901. I just went through this getting ready for my swap this fall.

(IMG:style_emoticons/default/agree.gif)

Get the Kennedy Stage II and never look back. It'll be perfect for your 2.7L ...
(IMG:style_emoticons/default/thumb3d.gif)
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shoguneagle
post Oct 2 2016, 09:16 PM
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I have a Stage 1 228mm clutch plate and pressure plate holding behind a 3.2 conversion. The clutch is doing very well holding all the power to a 901 transmission. Not having any trouble with the clutch whether cable or a recently installed hydraulic one.

I would work from the theory of the clutch and the pressure plate and what is needed to hold your engine's power.
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Catorse
post Oct 2 2016, 09:38 PM
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In any case looks like the trans is coming off to have a look inside. Has to be something...this thing makes MAYBE 230hp. I doubt that would totally overwhelm a stock 914 clutch
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cali914
post Oct 2 2016, 09:41 PM
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QUOTE(SirAndy @ Oct 2 2016, 08:13 PM) *

QUOTE(db9146 @ Oct 2 2016, 07:02 PM) *
Kennedy Engineering has a 228mm set-up that they recommend for a warmed over 2.7 mated to a 901. I just went through this getting ready for my swap this fall.

(IMG:style_emoticons/default/agree.gif)

Get the Kennedy Stage II and never look back. It'll be perfect for your 2.7L ...
(IMG:style_emoticons/default/thumb3d.gif)
ditto
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Catorse
post Oct 2 2016, 10:03 PM
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So to all you guys recommending the Kennedy, do you really think I have too much motor for my clutch?
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Steve
post Oct 2 2016, 11:34 PM
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I didn't need it. My motor was a fresh 911s 2.7 with webers and headers.
I would make sure you have 1/2" free play first before pulling it apart.
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sixnotfour
post Oct 3 2016, 02:24 AM
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(IMG:style_emoticons/default/agree.gif)
adjust your clutch
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Mark Henry
post Oct 3 2016, 08:42 AM
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I know it's not a /6, but my type 4 in a bug is 180hp with 20,000km, I can feel a hair of slip if really honk on it. I also undercut my PP by .010" to give a bit more pressure.

I'd say that 180hp is about the threshold of the 215mm PP.
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bdstone914
post Oct 3 2016, 09:58 AM
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QUOTE(r_towle @ Oct 2 2016, 04:48 PM) *

Could be a bad pressure plate too, unless you poured lots of oil on the dick


Ahhh.... I think you meant DISK not DICK right?
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