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> Shift coupler bushing options ?
pete000
post Apr 30 2014, 09:55 PM
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I am replacing my shift coupler bushings.

I purchased a white delrin set and they were way too sloppy and a poor fit. (IMG:style_emoticons/default/headbang.gif)
Next up is a set of urethane and they fit much tighter but the pin still floats around in the holes which appear to be oval shaped? Not sure if I would like that play due to the pin floating in the oval shaped holes. (IMG:style_emoticons/default/blink.gif)

I saw a set of solid brass bushings, these look interesting. (IMG:style_emoticons/default/shades.gif)

Has any one used them? (IMG:style_emoticons/default/idea.gif)

Are the pivot holes supposed to be oval shaped with slop around the pivot pin? (IMG:style_emoticons/default/idea.gif)

Any brand better than others? (IMG:style_emoticons/default/idea.gif)

There seems to be a lot of manufacturers out there and the prices go from $12 bucks to $40.00 for the brass ones. (IMG:style_emoticons/default/shades.gif)

(IMG:style_emoticons/default/blink.gif)


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Cap'n Krusty
post Apr 30 2014, 10:09 PM
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The holes are oval per the factory design for 911s, IIRC. That allows a little fore and aft play and keeps the shift fingers from applying a load to the shift rails while in gear. I don't think 914s had that, but the free play is slight enough that it wouldn't make much difference. What 914 owners have to worry about is radial play. That's what cause shifting issues and "sloppiness". Brass/bronze bushings are gonna transmit noise/vibration.

The Cap'n
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02loftsmoor
post Apr 30 2014, 10:13 PM
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Do you just drive that pin out to service the bushings??
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pete000
post Apr 30 2014, 10:34 PM
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QUOTE(02loftsmoor @ Apr 30 2014, 09:13 PM) *

Do you just drive that pin out to service the bushings??



It just presses out.

I agree with the Cap'n, the stock 914 bushings did not seem to have the oval holes and no slop. Mine were just cracked to hell. (IMG:style_emoticons/default/blink.gif)

These after market ones I picked up must be for the 911 and they just sell them for everything Porsche with a coupler thus the oval holes.

I read they make non oval versions. Just have to track them down. (IMG:style_emoticons/default/type.gif)

I also agree the solid brass ones might be a bit harsh for a street car. (IMG:style_emoticons/default/idea.gif)

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SLITS
post Apr 30 2014, 10:36 PM
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The ones currently supplied are for the 911. 914 will have round holes if you can find them.
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pete000
post Apr 30 2014, 10:39 PM
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QUOTE(SLITS @ Apr 30 2014, 09:36 PM) *

The ones currently supplied are for the 911. 914 will have round holes if you can find them.


This must be the 911 bushing like the ones I got.

Thanks for the info guys ! (IMG:style_emoticons/default/beer.gif)




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Dr Evil
post May 1 2014, 03:54 PM
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Ya, I dropped $20 on the graphite ones as an experiment....the holes are way too big. The part number was the same that I got from Pelican...not a 914 part, but a 911 part.

There is a member that makes a shift rod that uses a steering U joint. I am currently trying to score one.
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TravisNeff
post May 1 2014, 04:27 PM
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jwest has the bushings with the circular pin holes (instead of oval)
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CMONNETT
post May 1 2014, 04:44 PM
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I used the brass ones in my car. Works great, improved the shifting over the 1yr old graphite the car had in it. Haven't noticed any noise or vibration from them.
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Dr Evil
post May 1 2014, 05:12 PM
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Now that I have a 914 to drive and mess with, I am trying a lot of these things to get an idea of what is good and what is shit. I just rebuilt my coupler with the black bushings. Plenty of play in those. I only found the bronze bushings at Pelican for $50 or so. Too much, IMHO. I may just make some. I am wondering if an improvement in the coupler with the little tweak that I am experimenting with in the box, will be a simple and great improvement on the shifting.
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TJB/914
post May 1 2014, 06:21 PM
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QUOTE(Dr Evil @ May 1 2014, 07:12 PM) *

Now that I have a 914 to drive and mess with, I am trying a lot of these things to get an idea of what is good and what is shit. I just rebuilt my coupler with the black bushings. Plenty of play in those. I only found the bronze bushings at Pelican for $50 or so. Too much, IMHO. I may just make some. I am wondering if an improvement in the coupler with the little tweak that I am experimenting with in the box, will be a simple and great improvement on the shifting.


Dr.Evil, idea:
After you finish research, put together a kit & put me on the buy list.
I want to improve my shifting.
Tom
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pete000
post May 1 2014, 06:40 PM
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I spent some time on the phone this morning with Pelican Parts, they revamped their website and it too a while to dig up the part number for what I think it the poly bushing with the round hole.

I had no idea this would be so tricky. Guess so many Porsche's use the oval hole version and just the 914 did not making it a bit harder to locate.

If the one I get from Pelican is wrong I will order from Jwest thanks for the tip.

I am also considering the brass ones.


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JWest
post May 1 2014, 07:57 PM
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The ones I use are a tight fit on the pin, once assembled. When slipped onto the pin, they are a little loose, but the outside compresses in the coupler housing making a nice, tight fit on the pin. You can see the little gap in the pic with just the pin, then the tight fit (pin had to be pushed in and does not fall out when the bushing is in the coupler).

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Qarl
post May 1 2014, 08:39 PM
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So what is everyone's opinion on this stock coupler, versus a universal joint (ala Tangerine or Patrick)... versus Aircraft-type universal joint

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.aircraftspruce.com-271-1398998338.1.jpg)

(IMG:http://www.914world.com/bbs2/uploads_offsite/patrickms.s3.amazonaws.com-271-1398998338.2.jpg)

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.tangerineracing.com-271-1398998341.3.jpg)
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bdstone914
post May 1 2014, 09:40 PM
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QUOTE(pete000 @ May 1 2014, 05:40 PM) *

I spent some time on the phone this morning with Pelican Parts, they revamped their website and it too a while to dig up the part number for what I think it the poly bushing with the round hole.

I had no idea this would be so tricky. Guess so many Porsche's use the oval hole version and just the 914 did not making it a bit harder to locate.

If the one I get from Pelican is wrong I will order from Jwest thanks for the tip.

I am also considering the brass ones.


I think you will like the Pelican bushings. By the way they do come as a pair even though it says quantity 1.
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ChrisFoley
post May 2 2014, 06:41 AM
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The universal joint I use to replace the coupler attaches to the stock tunnel rod with a stock cone screw.
I also have a flange to hold the stock boot in place.
AFAIK, no other available upgrade offers those features. (IMG:style_emoticons/default/piratenanner.gif)

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r_towle
post May 2 2014, 06:57 AM
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QUOTE(Racer Chris @ May 2 2014, 08:41 AM) *

The universal joint I use to replace the coupler attaches to the stock tunnel rod with a stock cone screw.
I also have a flange to hold the stock boot in place.
AFAIK, no other available upgrade offers those features. (IMG:style_emoticons/default/piratenanner.gif)

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So your solution has a new coupler and rod, with the tail shifter flange and boot?

If so, that is a solution....well done.

Please confirm, I will buy that....

Rich
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ChrisFoley
post May 2 2014, 07:04 AM
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QUOTE(r_towle @ May 2 2014, 07:57 AM) *

So your solution has a new coupler and rod, with the tail shifter flange and boot?

If so, that is a solution....well done.

Please confirm, I will buy that....

Rich

That's a side shift flange (fabricated in-house) and (your) boot.
We don't include the boot in the kit.
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Qarl
post May 2 2014, 07:06 AM
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QUOTE(Racer Chris @ May 2 2014, 09:04 AM) *

QUOTE(r_towle @ May 2 2014, 07:57 AM) *

So your solution has a new coupler and rod, with the tail shifter flange and boot?

If so, that is a solution....well done.

Please confirm, I will buy that....

Rich

That's a side shift flange (fabricated in-house) and (your) boot.
We don't include the boot in the kit.



CHris,

Can you please talk a little about the stock coupler, versus the 2 types of universal joints pictured above?

Educate us a little about the advantages of each in comparison to shift feel, shift accuracy, and wear over time.

Thanks!

Q
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r_towle
post May 2 2014, 07:16 AM
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QUOTE(Racer Chris @ May 2 2014, 09:04 AM) *

QUOTE(r_towle @ May 2 2014, 07:57 AM) *

So your solution has a new coupler and rod, with the tail shifter flange and boot?

If so, that is a solution....well done.

Please confirm, I will buy that....

Rich

That's a side shift flange (fabricated in-house) and (your) boot.
We don't include the boot in the kit.

(IMG:style_emoticons/default/sad.gif)
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