Paul Spruell Flex Disc - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 39 (permalink) Old 05-04-2014, 08:51 AM Thread Starter
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Sometimes the "improved" part that wasn't designed for the car can be more trouble....
That may well be the case but I have not got 165HP by using standard parts.

It's interesting that you mention Sebring. I rode around Sebring last year in an Alfa Spider that makes over 200HP. It does not have a standard Giubo!

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #17 of 39 (permalink) Old 05-04-2014, 08:52 AM
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sounds like fun !

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Conservatives-we work hard, so you don't have to !
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post #18 of 39 (permalink) Old 05-04-2014, 09:35 AM
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Ed,

I installed the Spruell flex disc kit onto my higher horsepower autocross car (replacing the original giubo that had a GTA metal cage around it). It's been awhile but what I recall was how easy it was to install. Where you had to minipulate the original giubo to push over the three bolts on the trans, Spruell's disc slid right on. With the short driveshaft loosely mounted in the car I varied the the number of washer on each side (taking the shaft on and off) to position the driveshaft bearing cross member plate to the chassis mounting studs (per the instructions if I recall correctly). I attached a photo to try to show that the Spruell flex disc installed without distortion (whereas yours look distorted in a static position). I have no vibration with this setup. I hope this helps.
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post #19 of 39 (permalink) Old 05-04-2014, 09:39 AM
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I too purchased Spruell's set up but disregarded it and opted for Alfaholics heavy duty Giubo.
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post #20 of 39 (permalink) Old 05-04-2014, 10:13 AM
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I too purchased Spruell's set up but disregarded it and opted for Alfaholics heavy duty Giubo.
Did the Alfaholics part require any spacers? That is, was it the same thickness as the stock, Alfa giubo? Or thinner like the Spruell part?

Jay Mackro
San Juan Capistrano, CA

'65 Guilia Sprint GT
'67 Duetto
'91 164L
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post #21 of 39 (permalink) Old 05-04-2014, 10:54 AM Thread Starter
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I installed the Spruell flex disc kit onto my higher horsepower autocross car (replacing the original giubo that had a GTA metal cage around it). It's been awhile but what I recall was how easy it was to install. Where you had to minipulate the original giubo to push over the three bolts on the trans, Spruell's disc slid right on. With the short driveshaft loosely mounted in the car I varied the the number of washer on each side (taking the shaft on and off) to position the driveshaft bearing cross member plate to the chassis mounting studs (per the instructions if I recall correctly). I attached a photo to try to show that the Spruell flex disc installed without distortion (whereas yours look distorted in a static position). I have no vibration with this setup. I hope this helps.
It looks like the rear safety plate is bolted up to the flex disc without spacers. Is that the case?
Mine has 3 spacers on each bolt between the disc and the safety plate - that is according to the instructions. This places the safety plate very close to the driveshaft flange and I think that it might be interfering.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #22 of 39 (permalink) Old 05-04-2014, 11:37 AM
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Ed,

I just crawled under my car (tight fit as it's just on rolling "dollies"). You are correct, the rear safety plate is bolted directly to the flex disc. In addition, I have four (4) washers between the driveshaft flange and flex disc (X3). The front safety plate has one (1) washer between itself and the flex disc (X3). Finally I have three (3) washers between the trans yoke and flex disc (X3). I believe my kit came with 24 washers and I used them all. I recall the instruction indicating (I don't have them in front of me) that each car will vary in washer configuration due to individual car misalignment (manufacturing tolerences/accident damage etc.) and that it was important to have the driveshaft bearing mounting plate attach without any misalignment (for competition use anyway).

I STATED THE WASHER CONFIGURATION WRONG: THERE IS ONE (1) WASHER BETWEEN THE REAR SAFETY PLATE AND FLEX DISC, FOUR (4) WASHERS BETWEEN THE DRIVESHAFT FLANGE AND FLEX DISC. NO WASHER BETWEEN THE FRONT SAFETY PLATE AND FLEX DISC, AND THREE (3) WASHERS BETWEEN THE TRANS YOKE AND FLEX DISC.

-John

Last edited by Delllta; 05-04-2014 at 11:49 AM.
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post #23 of 39 (permalink) Old 05-04-2014, 12:15 PM Thread Starter
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Thanks John.

My center support lines up quite well with three washers between the trans yoke and the disc and two washers between the drive shaft and the disc. I will try an extra one on the rear and see how it looks. I plan to remove the spacers between the rear safety plate and the disc.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #24 of 39 (permalink) Old 05-04-2014, 02:12 PM
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Alfaholics' flex disc is the same thickness as stock.
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post #25 of 39 (permalink) Old 05-04-2014, 02:43 PM Thread Starter
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Why did you abandon the Spruell disc?

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #26 of 39 (permalink) Old 05-04-2014, 03:29 PM
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Re-configuration of spacers!

Note that I've re-configuring the spacers and noticed that the Spruell giubo already has a natural wave to it if you place it flat on a bench (unless my has retained its distortion!).

Anyway I've configured as follows:
Yoke bolts: 4 spacers + giubo + 1 spacer + safety plate + nut
Prop bolts: 2 spacers + giubo + 1 spacer + safety plate + nut

Obviously this is untested and will be waiting for clarification from Paul Spruell!
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post #27 of 39 (permalink) Old 05-04-2014, 04:57 PM
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I have one and it is straight, not distorted. I'll have to look but I seem to remember three washers on each side, 3 on three nuts on one side and 3 washers on the other side on the yoke. I'll see if I cant get a photo.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #28 of 39 (permalink) Old 05-04-2014, 05:07 PM
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The stiffer giubo that I got from Spruell a year or so ago was the same thickness as my Alfa giubo, so I didn't need the washers. And I didn't install the three-eared safety disks.
Arghh! I just got it through my thick skull that Spruell sells two types of heavy-duty giubos:

- What I installed is their p/n 605-15851-HD. This is described at: Alfa parts and other Sports Car Performance Parts as " Driveshaft Donut Upgrade (German) Fits all 101, 105 and 115 Alfas". This part is the same thickness as the OE giubo, so there is not enough space to install the three-eared safety disks.

- What alfaparticle has is Spruell p/n 15851KIT, which includes a different style giubo and two of those three-eared safety disks. Spruell needs to use a narrower guibo with this set-up in order to accommodate the thickness of the safety disks.

Sorry, I just hadn't tumbled as to why the giubo in alfaparticle's pictures looked so different from mine.

Jay Mackro
San Juan Capistrano, CA

'65 Guilia Sprint GT
'67 Duetto
'91 164L

Last edited by Alfajay; 05-04-2014 at 05:15 PM.
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post #29 of 39 (permalink) Old 05-04-2014, 09:17 PM
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Correction!

Ciao Ed (Delllta),

Note that your spacer configuration outlined below would distort my giubo!

"THERE IS ONE (1) WASHER BETWEEN THE REAR SAFETY PLATE AND FLEX DISC, FOUR (4) WASHERS BETWEEN THE DRIVESHAFT FLANGE AND FLEX DISC. NO WASHER BETWEEN THE FRONT SAFETY PLATE AND FLEX DISC, AND THREE (3) WASHERS BETWEEN THE TRANS YOKE AND FLEX DISC."

I've measured and marked the centre line of the giubo and reconfigured the spacers (as per below) and then compared the distance from the gearbox and I'm still out by one 1.1mm. Note that I'd prefer to have a spacer in between the giubo and the safety plate as without the spacer, the plates fowl up with the giubo.

Yoke bolts: 5 spacers + giubo + 1 spacer + safety plate + nut
Prop bolts: 1 spacers + giubo + 1 spacer + safety plate + nut

One bit of vital information required (as per the third photo) is the distance from the gearbox to the propshaft flange? Depending on this correct distance, (as RJ indicated affects the spherical ball's working surface at the output shaft) my revised configuration of spacers could be as follows:

Yoke bolts: 5-4 spacers + giubo + 1 spacer + safety plate + nut
Prop bolts: 1-0 spacers + giubo + 1 spacer + safety plate + nut
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post #30 of 39 (permalink) Old 05-05-2014, 03:53 PM
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It is critical the three metal collars standind proud of the disc be fitted to the gearbox yoke. Otherwis the three washers fitted will not move it far enough to the rear to keep it off the center withou distortion.




The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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