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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Sep-27-2018, 03:22:48 PM   #11
WuBai
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Default Re: Aftermarket Plenum Clamps

GeorgeH, I've spent a lot of time researching this and FINALLY the moment has come when I can say "Hey! I know that answer!" Had to dig back through my email receipts from 2013 but here they are...

https://frsport.com/aba-11065-reinfo...65mm-1-97-2-56

Smooth on the inside. Perfectly sized and will leave absolutely no marks on the rubber.
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Old Thu, Sep-27-2018, 03:27:31 PM   #12
GeorgeH
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Default Re: Aftermarket Plenum Clamps

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Originally Posted by WuBai View Post
GeorgeH, I've spent a lot of time researching this and FINALLY the moment has come when I can say "Hey! I know that answer!" Had to dig back through my email receipts from 2013 but here they are...

https://frsport.com/aba-11065-reinfo...65mm-1-97-2-56

Smooth on the inside. Perfectly sized and will leave absolutely no marks on the rubber.
WuBai, I know that feeling, haha. Thanks for the input!

I found those too, and they are pretty much what I'm looking for except I hate the blue housing, lol. I also wondered how wide the housing was/is, do you have any pictures of them installed?
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Old Thu, Sep-27-2018, 03:44:56 PM   #13
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Default Re: Aftermarket Plenum Clamps

Factory TB side ones are reusable if removed correctly IIRC.
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Old Fri, Sep-28-2018, 12:03:31 AM   #14
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Default Re: Aftermarket Plenum Clamps

I’m not quite understanding why you must have them perfectly flat. The ones linked are smooth enough and do not do damage. I totally forgot about BMW using these on the S62, S65, S85 to secure the boots to the throttle bodies.

For the S85, the throttles are identical to the S54. BMW uses Norma clamps, 45-65.
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Old Fri, Sep-28-2018, 12:37:07 AM   #15
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Default Re: Aftermarket Plenum Clamps

Thinking of trying these in black.
https://www.enjukuracing.com/product...IaAjOaEALw_wcB
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Old Fri, Sep-28-2018, 12:40:51 AM   #16
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Default Re: Aftermarket Plenum Clamps

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Originally Posted by Braymond141 View Post
They are the same style as your OEM clamps for the cooling system (thermostat housing for the S54). That Turner link above shows them perfectly. They are smooth enough to not tear up the boot, but they will leave an indent.
+1. I've used these for 2-3 yrs with no issue. The bigger issue are the wider clamps that people pickup from home depot that eventually squash the manifold boots. These do not tear up the boot you're crazy OP.

I've pulled the manifold like 50 times (not being sarcastic) and never had an issue. Lol.
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Old Fri, Sep-28-2018, 01:56:05 AM   #17
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Default Re: Aftermarket Plenum Clamps

Because I believe over time the worm style hose clamp will cut into the boot. Whether that's a realistic concern or not idk. But I have seen plenty of cut hoses from worm clamps and multiple times have I seen that cause a vacuum leak. And I hate chasing vacuum leaks, even more so when they are self inflicted from an improper prior repair.

With that said I'm planning to buy clamps either way, why not buy what I think is the best option?

And I know its an option because I have them on another engine (not mine). I pulled the plenum off to take pics so y'all will know I'm not crazy.







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Old Fri, Sep-28-2018, 04:39:54 AM   #18
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Default Re: Aftermarket Plenum Clamps

That style does not cut up the boots.
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Old Fri, Sep-28-2018, 07:17:23 AM   #19
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Default Re: Aftermarket Plenum Clamps

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I would normally use the factory clamps but these are going on a car that would need to be serviced at the track and ease of use is more important than originality.

The kicker is I want a smooth inside surface so they don't eat at the boots when tightened. Like this:
https://www.ffx.co.uk/tools/product/...e-Clip-55-70Mm

I have a set already that say "PEARL" on them, but can't find that anywhere on google. The size range is 55-70mm.

Thanks

How about a set of t-bolt clamps? They are smooth ID, tug from both sides to prevent binding (like the OE oetiker clamp), and are fairly cheap?


Personally, I bought a big bag of oetikers from McMaster-Carr for my track car and got good at removal/installation; once you have it down it's no slower than a reusable clamp -- but if I was going to pick a reusable clamp it'd be a t-bolt.
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Old Fri, Sep-28-2018, 07:26:17 AM   #20
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Default Re: Aftermarket Plenum Clamps

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Originally Posted by GeorgeH View Post
Because I believe over time the worm style hose clamp will cut into the boot. Whether that's a realistic concern or not idk. But I have seen plenty of cut hoses from worm clamps and multiple times have I seen that cause a vacuum leak. And I hate chasing vacuum leaks, even more so when they are self inflicted from an improper prior repair.

With that said I'm planning to buy clamps either way, why not buy what I think is the best option?

And I know its an option because I have them on another engine (not mine). I pulled the plenum off to take pics so y'all will know I'm not crazy.







It's not only the serrated edge that causes the rubber to fatigue; if you're using a worm-gear in the place of an oetiker there is a shear binding that's occuring at the edge of the rubber where the torque is first applied at the very beginning of the clamp.

This occurs because the worm-gear clamp is pulling one side and relying on the underlying surface to allow the clamp to slide around until tight. That means that the shear has to be overcome in order for torque to be applied to the entire circumference of the band, a large force which can damage the rubber before getting tight enough to clamp the device if there is a significant amount of binding or too much friction between the clamp and the hose.

You're absolutely right to worry about cut-through with a worm-gear style clamp. There is (good) reason they chose to use an Oetiker style clamping mechanism.

That said; if you must use a reusable clamp, choose one that tightens bi-laterally like a t-bolt.

If you must use a worm-gear style clamp and you're worried about the underlying rubber, use a light amount of material-safe lubricant between the clamp and the rubber before tightening it down while observing for excessive flare-out of the rubber from the opposite side of the clamp. If the rubber is deforming too much before making a good seal, find a new clamping mechanism.
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Discussing Aftermarket Plenum Clamps in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)