Installing Port Divider

[MercuryMarc]

I'd like to install an exhaust port divider on my 200 (78 Fairmont) block. I see them advertised in Cliffords. Do I have to weld it on or is there another way?

Thanks!

Marc in SF
63 Comet
69 200/C4 Tranny
Dual Cupholders
78 Fairmont 200 being rebuilt and will be swapped in this winter
http://mercurycomet.net[/i]

 

[Anonymous]

some people here used JB weld I believe...some have had luck with it...some it rattles

 

[Junk-Falcon]

ppp

 

[MercuryMarc]

Novice here....

Is brazing easier than welding? Is that something that I can do without $$$? The JB Weld sounds fairly easy.

Thanks-

Marc in SF
63 Comet
69 200/C4 Tranny
Dual Cupholders
78 Fairmont 200 being rebuilt and will be swapped in this winter
http://mercurycomet.net

 

[Junk-Falcon]

you need

 

[Anonymous]

CobraSix uses/used cotronics high temp epoxy. I believe it's called Resbondâ„¢ 907GF. The website is www.cotronics.com.

 

[Anonymous]

I used this to put my port divider in, and it has stayed put for over a year. It is inexpensive, and available at auto parts stores. I just used the putty, not the wire or anything else....it hasn't moved and was in there like a rock.

http://www.permatex.com/auto/autouc.asp ... m_no=80334

There has been other discussions about this in the past, if you do a search on this site, you will find lots of info.

I would stay away from JB Weld because it isn't rated high enough as far as temp.

Ryan

 

[TheDude]

CobraSix uses/used cotronics high temp epoxy. I believe it's called Resbondâ„¢ 907GF. The website is www.cotronics.com.

I also used the epoxy. It works great. My port divider has been in there for over a year with no problems.

 

[gtm1086]

No to JB weld or Marine tex or just about any of the over the counter products. None of them have a high enough temp. rating. The epoxy some of the other guys seems to of worked in alot of cases. The best way is to braze or have it welded in.

 

[Anonymous]

sorry, I never should have said JB....

 

[JOHN G]

THE BEST WAY(IF THE HEAD IS OFF) IS TO HAVE IT TIGGED IN. THIS STILL REQUIRES HEATING THE AREA QUITE A BIT WITH A TORCH,BUT FAR LESS THAN WHAT WOULD HAVE TO BE DONE WITH BRAZING. THE OTHER OPTION I HAVE SEEN USED IS DRILLING HOLES THROUGH THE DIVIDER AND INTO THE MEAT OF THE HEAD AND DRIVING SPLIT PINS TROUGH THE HOLES AND INTO THE HEAD-KINDA OF TRICKY, BUT YOU WON'T WARP OR CRACK THE HEAD DUE TO HEAT.

 

[Anonymous]

Don't use JB Weld. I used a High-Temp epoxy from Aremco and I was able to install the port divider without removing the head. Someone alsp used to talk about welding with 'muggyweld sticks' but I don't know much about welding so I can't comment on it. I have put several thousand miles on my car and no problems with the port divider so far.

-Dan in Atlanta

 

[CobraSix]

No to JB weld or Marine tex or just about any of the over the counter products. None of them have a high enough temp. rating. The epoxy some of the other guys seems to of worked in alot of cases. The best way is to braze or have it welded in.

Exactly. OTC "High Temp" epoxys have a PEAK heat rating of around 500*F (JB Weld). I've used a laser thermometer on the exhaust manifold before...and let me tell you, the manifold alone will hit 300* normal idle running on a cool day. Much more if you happen to lean out or really push it.

the Cotronics stuff worked really well on my US log head with the port divider. 15k miles and when I pulled the head...still tight as can be. the 907GF has a sustained temp rating of 2300*F and peak of 3000*F. If your exhaust hits those temps...you'll have other issues.

However, I fear that the cotronics may have failed on the Aussie head. No fault of Cotronics stuff, just the head is different. THe US head has the ridges in the exhaust port that match up and provide support for the exhaust port divider. The Aussie head that I got did not have those ridges and thus the contronics had to perform more of a structural support role then that of just an epoxy. I don't have direct evidence of failure yet but I have a rattle from the exhaust around the 3-4 ports. I'll know more when I pull the head off to look at it...or at least the exhaust.

Here is the Aussie head with the divider:

 

[66Sprinter]

Slade...

Iam wearing glasses..but it looks like the divider sits back inside the exhaust port..and not flush like some many G-heads say has to be done. Can ya splain it more?

 

[CobraSix]

Optical illusion with the flash and the epoxy. It is flush, with slight erring on extending out of the port so it will seal up well against the headers.

Slade

 

[MercuryMarc]

Thanks for all the great advice!

I'll update the group once I get it done.

Marc in SF
63 Comet
Dual Cupholders
http://mercurycomet.net

 

[Anonymous]

mine's held in with a set screw. i can't remember if there were anything special about the install, but i'm pretty sure its a Clifford one.