Silicone exhaust coupler

[Rep732]

Mo engine Mo heat!

 

[Jshaff16]

Obr soon. Got one rig...perhaps two benched waiting on a powerplant

 

[Roni92]

too bad that thread died, i thought only i have never ending problem with silicone couplers melting because of bad rovan exhaust with idiotic design where coupling is way to close to engine. Turns out brand stuff have the same design flaw. What they are thinking about when designing those 4cm headers ffs? :/
Just recently in act of desperation i used aluminum foil under silicone coupler as "isolation"... Now i know aluminum is one of better heat conductor BUT my theory is, is that not temp itselt destroiy silicon coupler, but super hot exhaust gases acting directly on it. Maybe not, but its just another idea(number 9999) to try out...
So far it kinda works, but its hard to tell, i still have to tighten clamps on header after every drive, which is historically sign that silicone coupler is being "eaten" from inside and getting slimmer. But it could also be that clamp just getting loose. It was on verge of falling apart anyway so its hard to tell if its "solution" but i think it helps, so should at least prolong life of coupler, will see, ill report when it finally self destroys completely, until then ill keep driving and in the meantime order new coupler pipe.... the fight continues

 

[Rep732]

To be quite blunt here those silicone couplers are cut from lengths made and designed to be used for engine coolant systems or hot liquid. The header gets far too hot for the use of these hoses and that is the issue.

I work on garbage trucks that utilize these same hoses and over time they degrade and blow out at temperatures that only reach 250 degrees max.

 

[smokinwheel]

I work on garbage trucks

Boy I don't miss those days.
Earlier in life I worked on garbage trucks and stationary commercial compactors.
The money was good but there were some days I should have stayed home.

No lack of Rats the size of Cats and plenty of living rice on a hot summer day.

 

[Roni92]

To be quite blunt here those silicone couplers are cut from lengths made and designed to be used for engine coolant systems or hot liquid. The header gets far too hot for the use of these hoses and that is the issue.

I work on garbage trucks that utilize these same hoses and over time they degrade and blow out at temperatures that only reach 250 degrees max.

Oh but i know what they for, I order them from car tuning shops, usually advertised as part for intake. They advertise as graded for up to 260*C which is imo optimistic anyway, that's not the issue.
The fault is with header design, and proof is in this thread, look at DougStar post on page 1 - his coupler is fine not because its some special type but because header is long enough that exhaust gases cool down enough not to destroy it.
If coupler is 3cm from exhaust port it will never last....
Exhaust engineer should take that into account.
Even Rovan learned that and fixed this issue on newer LT where header is way longer, my is still old type very short. But it's Rovan, it's not that surprising...
Again, I'm just surprised even branded, expensive pipes have that design flaw, there's really no excuse for it.

 

[smokinwheel]

High-Temperature Wrap Sleeving​

A mica and silicone rubber blend allows this sleeving to withstand temperatures up to 2100° F and creates a fire barrier around its contents. A good option for emergency patches, it can be quickly applied to hose or cable like tape. When wrapping, sleeving should overlap itself by half its width.

Wd.	Thick.	Max. Temperature, °F	Color		Each		Each
				15 ft. Lg.	100 ft. Lg.
Mica/Silicone Rubber Blend
1/2"	0.005"	2100°	Gray	6811A21	$3.30	6811A11	$12.70
1"	0.005"	2100°	Gray	6811A22	6.44	6811A12	24.77
2"	0.005"	2100°	Gray	6811A23	12.88	6811A13	49.53
3"	0.005"	2100°	Gray	6811A24	19.27	6811A14	74.10

Would something like this work?
I know it is thin but you might be able to wrap it a few times to seal it from leaking.

Just a thought.

 

[jeepfreak1972]

High-Temperature Wrap Sleeving​

A mica and silicone rubber blend allows this sleeving to withstand temperatures up to 2100° F and creates a fire barrier around its contents. A good option for emergency patches, it can be quickly applied to hose or cable like tape. When wrapping, sleeving should overlap itself by half its width.

				15 ft. Lg.	100 ft. Lg.
Mica/Silicone Rubber Blend
Wd.	Thick.	Max. Temperature, °F	Color		Each		Each
1/2"	0.005"	2100°	Gray	6811A21	$3.30	6811A11	$12.70
1"	0.005"	2100°	Gray	6811A22	6.44	6811A12	24.77
2"	0.005"	2100°	Gray	6811A23	12.88	6811A13	49.53
3"	0.005"	2100°	Gray	6811A24	19.27	6811A14	74.10

Would something like this work?
I know it is thin but you might be able to wrap it a few times to seal it from leaking.

Just a thought.

I like that idea. Wrap the joint, then skide the coupler over it and clamp / zip tie in place.

 

[smokinwheel]

I like that idea. Wrap the joint, then skide the coupler over it and clamp / zip tie in place.

Yeah you probably could do that too.
I wondered if just wrapping it would be enough.

Just a thought , don't know how it would work.
Maybe I will be the Guinea Pig and give it a shot?

 

[jeepfreak1972]

Yeah you probably could do that too.
I wondered if just wrapping it would be enough.

Just a thought , don't know how it would work.
Maybe I will be the Guinea Pig and give it a shot?

Well yes, you can be the piggy.

 

[smokinwheel]

Next time I place an order there I will toss one in the cart. It's cheap enough for a small roll.
Be interesting to see what it actually looks like.