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LM PMT rear control arms
Posted by: jetcat ()
Date: March 11, 2019 04:02PM

Are the users of PMT control arms happy with the purchase of the inner bushing next to the adjustment slots? Guess you don't need to torque the bolts as tight as the stock setup. I made custom washers to keep the bolt centered since the adjustment is made on the rod.

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: LM PMT rear control arms
Posted by: thewolfe ()
Date: March 11, 2019 04:06PM

That's the only thing I feel is missing from the PMT rods. I ditched the cam bolts and made square washers to lock a standard bolt in place.

Nate Wolfe
Portland OR
65 Corsa 180

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Re: LM PMT rear control arms
Posted by: Pacerace ()
Date: March 11, 2019 04:11PM

I don't use the PMT rods, but did the same as Nate. The C4 Corvette arms came with square washers, and I just cut them a big narrower to fit in the Corvair spot. It's worked great for years!

________________________________________________________

Chandler
Powder Springs, GA.



1965 Corvair Monza 110/4sp Coupe

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Re: LM PMT rear control arms
Posted by: jetcat ()
Date: March 11, 2019 04:12PM

thewolfe Wrote:
-------------------------------------------------------
> That's the only thing I feel is missing from the
> PMT rods. I ditched the cam bolts and made square
> washers to lock a standard bolt in place.

I think it was from one of your posts that I got the idea for the sq washers.

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: LM PMT rear control arms
Posted by: azdave ()
Date: March 12, 2019 04:58AM

thewolfe Wrote:
-------------------------------------------------------
> I ditched the cam bolts and made square
> washers to lock a standard bolt in place.

Well that's just crazy talk. grinning smiley

Pic after C4 strut install on my wife's 65 4-dr.



Dave W. / Gilbert Arizona
65 Corsa 140/4
66 Corsa 140/4
66 Corsa 140/4 w/factory A/C
66 Corsa 455 Toro V8
65 Monza Convertible 110/4
66 Monza Convertible 140/4
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5



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Re: LM PMT rear control arms
Posted by: jetcat ()
Date: March 12, 2019 10:26AM

thewolfe Wrote:
-------------------------------------------------------
> That's the only thing I feel is missing from the
> PMT rods. I ditched the cam bolts and made square
> washers to lock a standard bolt in place.


I cut the inner spacer length to 2.170" and used the Clark's step washers for the stock bushings. Voila! (talked to Ray Sedman last night and that was his suggestion)

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: LM PMT rear control arms
Posted by: MonzaDave ()
Date: March 13, 2019 08:47AM

With my PMT control arms, I left the cam bolts in place and make the adjustment on the control arms. I'm not quite sure why you need to replace the cam bolts with a regular bolt.

Dave Keillor
Rochester, MN

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Re: LM PMT rear control arms
Posted by: jetcat ()
Date: March 13, 2019 09:39AM

MonzaDave Wrote:
-------------------------------------------------------
> With my PMT control arms, I left the cam bolts in
> place and make the adjustment on the control arms.
> I'm not quite sure why you need to replace the
> cam bolts with a regular bolt.

You don't need to change the cam bolts... However, if your old bolts are rusty junk then you might as well use standard bolts and sq washers. I just made sq washers out of some 4140 plate I had in my scrap pile. Nothing fancy.

No matter what bolt or washers you use, the point of the post is the minimal amount of purchase there is with the inner bushing sleeve to the torque arm slot (see photo). It is easily remedied by cutting the length of the internal sleeve and using the Clark's step washers. The step is exactly the same diameter of the sleeve and now the load is spread across the slot.

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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