Carbon box opening too small? no problems

Jul 19, 2017 | 11:39 AM

bayhas

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Joined: Aug 2011

Posts: 188

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From: Lincoln, MA

SL55, GLS63, E550, GT and 300SE

Carbon box opening too small? no problems

So RENNtech could not make a custom CF box to match my ported 80mm snout, and plateless 82mm TB

Reason being, RENNtech starts with a stock 74mm snout (113 140 04 12), then weld it and build it up to be able to take the 82mm,

whereas other makers just add ears to the stock 80mm snout (113 140 09 12) then port it.

The difference is the 82mm throttle end up in different height, relevant to the CF box mouth...

What do I do??? Dremel comes to the rescue, a 74mm RENNtech box can be easily ported out to fit around 82mm TB

But what do we do with leaks?

That's when I put my creative hat on, and hit eBay looking for 4" heat shrink tube.

Cut a properly sized ring, place it around the assembly, then hit it with heat gun, after everything is assembled...

The result is probably not only gas leak proof, but probably liquid leak free!

Jul 19, 2017 | 11:46 AM

Forrest Gump 9

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shrimp boat

Good job. That's what I did on mine too except for the shrink wrap step.

Jul 19, 2017 | 08:57 PM

black06c230

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From: Usa

mgLipGD

Did the same here but never bothered to fully seal as didn't see too much getting in there and had no drive ability issues. Great idea on to seal it up good.

Jul 19, 2017 | 09:20 PM

bayhas

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Joined: Aug 2011

Posts: 188

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From: Lincoln, MA

SL55, GLS63, E550, GT and 300SE

Although I probably gained one or two horse power from this seal, by peventing leaks that mess with the vortex inside the tube, but my main goal was longevity, to seal it against fine dust and sand, that could make it through.

If the neck gets dirty with grease and slime (oil blow by is magnet for that kind of crap), if it makes it inside the engine, it will easily score cylinder walls and Lower pressure, if not worse...

Last edited by bayhas; Jul 20, 2017 at 01:39 PM.

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