100 mm CV boot question

[MarkWard]

Hello, my 1980 911 ROW has 100 mm cv joints. It has 2 boots that are the original type with the boot bonded to the retaining ring. The other 2 boots have a clamp that attaches them to the retaining ring.

Here is my dilemma, The boots sold here and other suppliers we deal with are basically what appear to be VW type 2 100 mm cv boots with stamped sheet metal retainers. I suppose these would work fine, but you need the bolt straps 211501357 under the bolts to install them properly.

Is this my only option now days? I'd prefer to use the heavy duty 911 bolt ring with a clamped boot. Are these no longer available? Thank you. Mark

[Tom_in_NH]

I used the 100mm moon plates from J Bugs with the wimpy new stamped steel boot flanges. They call them torque distribution washers. I was seriously tempted to disassemble the new axles and fit my old, still decent, boots with the heavy flanges.

[MarkWard]

That's what I was beginning to realize. IMC shows a flangeless EMPI boot for the 100mm Porsche CV 86-1094-D . These would work fine on the one set of boots I have. The factory style boots appear to have enough flange that the above boots might also work. If Porsche had thought VW Type 2 boots would have worked I'm sure they would have gone that route. They wanted the heavy flanges for a reason. Thank you Tom.

[Walt Fricke]

Well, I have used thin (stamped metal) boot flanges on my race cars for over 20 years, with no moon plates. Work fine, weigh a bit less. I use the kind where you can remove the boot and replace it separately. Eventually the holes in the flange close, making it hard to get the threaded part of the bolt out, but that is manageable. Wouldn't happen with moon plates taking up the compression.
JCWhitney maybe still carries a universal boot - you cut at the pleats in its bellows to fit your shaft and flange, and zip tie the boot on. I wouldn't worry.

Reusing old but good boots certainly makes sense, though.

[MarkWard]

Walt, not sure why you'd reference JC Whitney universal boot. But thank you.

[mikedsilva]

Originally Posted by MarkWard

Hello, my 1980 911 ROW has 100 mm cv joints. It has 2 boots that are the original type with the boot bonded to the retaining ring. The other 2 boots have a clamp that attaches them to the retaining ring.

Here is my dilemma, The boots sold here and other suppliers we deal with are basically what appear to be VW type 2 100 mm cv boots with stamped sheet metal retainers. I suppose these would work fine, but you need the bolt straps 211501357 under the bolts to install them properly.

Is this my only option now days? I'd prefer to use the heavy duty 911 bolt ring with a clamped boot. Are these no longer available? Thank you. Mark

I think you can still buy the gen porsche boots with thick flange... they are listed here on PP.
I was going to order a set of the pressed steel ones but was told it would not give enough room inside for the joint to work?? Not sure if that is correct tho...

[MarkWard]

Mike, thanks. I hadn't noticed those boots on P.P. I'll likely go with the stamped sheet
metal boots . The OE bonded one would have the same problem if the boot eventually failed plus at $100 a pop, time to update. To someone that comes across this post. The CV bolts for the Genuine CV boot are longer. They measure about 50mm. I assume to allow for the thicker boot flange. The stamped sheet metal boots appear to use a 45 mm bolt. Not sure if the extra 5mm is going to protrude enough on the back side of either flange to cause a problem.

Looking at the OE bonded thick flange boot. I can't see how that would help CV joint articulation, but I did notice the inner boot housing was slightly deflected from an axle drooping on the inner flange. The stamped sheetmetal boots have a "wider" ID vs the OE bonded.

Case closed. thank you.

[gtc]

Mark,
The empi boots attach to a thin, stamped flange. There is a separate, thicker plate under this thin flange, and together they are approximately the same thickness as the original porsche flanges. You can see this in high-res photos of the empi part on other websites (auto haus az for example).

I won't go in to the moon plate/schnoor washer/nordlock washer debate.

[mikedsilva]

Originally Posted by gtc

Mark,
The empi boots attach to a thin, stamped flange. There is a separate, thicker plate under this thin flange, and together they are approximately the same thickness as the original porsche flanges. You can see this in high-res photos of the empi part on other websites (auto haus az for example).

I won't go in to the moon plate/schnoor washer/nordlock washer debate.

hi Graham
do you have a link to these Empi boots?

[MarkWard]

Yes, I'd also like to see a link to this Empi boot. I had 2 boots that were newer that are similar to the Empi boots you describe. No distinguishing marks on them. It looks as if the bare replacement Empi boots from IMC would work with these. Maybe the same.






I intend to use these two boots over. I've ordered 2 GKN boots for an Audi 5000 that will get the serrated lock washers and "dreaded moon plates" I've got some used vanagon hardware. Thanks.