Planet Minis

Lennart · 01-31-2009, 10:16 AM

I want to port my GPX 150 head. I am planning to use some epoxy.
Now I heard J-B weld is good epoxy to make it work. But what other options in epoxy do I have?

And where do I buy J-B epoxy?

If I use epoxy in my ports, and the head is warming up. The head material will expand, but I don't think the epoxy will expand. How does this work, won't the epoxy crack or com loose?

Thanks,

Lennart

dood · 01-31-2009, 10:27 AM

Do not use JB weld epoxy to fill the ports. It won't work.
One of the companies I use is Joe Mandella Pro shop. Google it and you'll see his stuff.

Lennart · 01-31-2009, 10:28 AM

Quote:

Originally Posted by dood

Do not use JB weld epoxy to fill the ports. It won't work.
One of the companies I use is Joe Mandella Pro shop. Google it and you'll see his stuff.

why won't it work, because I know a few guys that already used it.
Thanks for the help.

Lennart

dood · 01-31-2009, 10:31 AM

It can work but I have found that if you use it on a used head even if you bead blast the port walls, it doesn't stick very well and the chunks can pull away from the port wall.
The stuff from Joe Mandella works. I recommend that over JB weld epoxy.

AHPminis · 01-31-2009, 10:49 AM

Quote:

Originally Posted by Lennart

I want to port my GPX 150 head. I am planning to use some epoxy.
Now I heard J-B weld is good epoxy to make it work. But what other options in epoxy do I have?

And where do I buy J-B epoxy?

If I use epoxy in my ports, and the head is warming up. The head material will expand, but I don't think the epoxy will expand. How does this work, won't the epoxy crack or com loose?

Thanks,

Lennart

Another option is MarineTex, not sure if its available where you live Lennart.

Marine Tex, epoxy resin, adhesives, silicone grease, engine treatment, cleaner, repair, bond, fill, seal, fiberglass, aluminum, plastics, Starboard, wood

schofell84 · 01-31-2009, 10:53 AM

Quote:

Originally Posted by dood

Do not use JB weld epoxy to fill the ports. It won't work.
One of the companies I use is Joe Mandella Pro shop. Google it and you'll see his stuff.

a golfing store? hahaha

have you tried the jb with some anchors cut into the port?

Lennart · 01-31-2009, 10:54 AM

Quote:

Originally Posted by dood

It can work but I have found that if you use it on a used head even if you bead blast the port walls, it doesn't stick very well and the chunks can pull away from the port wall.
The stuff from Joe Mandella works. I recommend that over JB weld epoxy.

Ok thanks 'Dood' and Mark.
But I can't find Joe Mandella Pro shop.
And do you have any recommendations about porting a GPX 150 head, 'Dood'.
Or can I send you a pm about that?
I thought I want to get a high velocity port, by reducing the intake port by, lets say 20% of the intake valve?

Lennart

firepower354 · 01-31-2009, 12:00 PM

Maybe this guy, dood?
Products
Joe knows...

We used a BUNCH of these guys stuff:
ITW Devcon | Two of the most recognized brands in all of industry; Devcon® and Permatex®.
Filled the bottom 1/4 of a set of SOHC 427 heads and tunnel ram. About 6lbs of epoxy to gain 30 CFM.

Kurlon · 01-31-2009, 01:48 PM

Also, the longer the cure time, the better the epoxy. Sure, 5 min stuff has instant gratification appeal, but it's not as hard and doesn't bond as well as the 24hr stuff.

01-31-2009, 10:16 AM	#1 (permalink)
Lennart 2nd Gear Member Join Date: Dec 2007 Posts: 313	Porting with epoxy (J-B weld Epoxy) I want to port my GPX 150 head. I am planning to use some epoxy. Now I heard J-B weld is good epoxy to make it work. But what other options in epoxy do I have? And where do I buy J-B epoxy? If I use epoxy in my ports, and the head is warming up. The head material will expand, but I don't think the epoxy will expand. How does this work, won't the epoxy crack or com loose? Thanks, Lennart

01-31-2009, 10:27 AM	#2 (permalink)
dood 3rd Gear Member Join Date: Sep 2006 Location: Washington Posts: 3,055	Re: Porting with epoxy (J-B weld Epoxy) Do not use JB weld epoxy to fill the ports. It won't work. One of the companies I use is Joe Mandella Pro shop. Google it and you'll see his stuff.

01-31-2009, 10:31 AM	#4 (permalink)
dood 3rd Gear Member Join Date: Sep 2006 Location: Washington Posts: 3,055	Re: Porting with epoxy (J-B weld Epoxy) It can work but I have found that if you use it on a used head even if you bead blast the port walls, it doesn't stick very well and the chunks can pull away from the port wall. The stuff from Joe Mandella works. I recommend that over JB weld epoxy.

01-31-2009, 12:00 PM	#8 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 11,002 My Mood:	Re: Porting with epoxy (J-B weld Epoxy) Maybe this guy, dood? Products Joe knows... We used a BUNCH of these guys stuff: ITW Devcon \| Two of the most recognized brands in all of industry; Devcon® and Permatex®. Filled the bottom 1/4 of a set of SOHC 427 heads and tunnel ram. About 6lbs of epoxy to gain 30 CFM. __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories. Last edited by firepower354; 01-31-2009 at 12:03 PM.

01-31-2009, 01:48 PM	#9 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 8,301	Re: Porting with epoxy (J-B weld Epoxy) Also, the longer the cure time, the better the epoxy. Sure, 5 min stuff has instant gratification appeal, but it's not as hard and doesn't bond as well as the 24hr stuff.

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