Made a little boo boo

sen2two · 08-12-2010, 02:46 PM

I had a spare center iron I'm using for a cheap experimental motor. So when it comes to experimenting, I was pushing the limits of the porting. I actually ported the bottom edge of the bridge port deep enough to create a small hole into the coolant passage. The hole is maybe a 1/6" of an inch around.

I want to know if i can just JB weld it shut (as i was planning on JB welding a few areas anyways for better transition). This is an NA motor and will not see boost. I know that JB weld will withstand the heat, but will it keep the water from seeping in under pressure? How much pressure do the coolant passages actually see? I don't imagine it being much...

NoDOHC · 08-12-2010, 06:05 PM

Well, what pressure of radiator cap do you use? Add 0.46 psi per foot of elevation below the cap.

I would worry slightly about the difference in the thermal expansion rate of the JB weld and steel.

sen2two · 08-12-2010, 06:22 PM

I have (and many other) have used JB weld in the ports. So I'm not worried at all about the JB weld bonding. The only thing that worries me is if it will keep the coolant from seeping in. I have used it to block water/coolant in manifold/TB's and other things. But never to block water in the motor.

I'm pretty sure it will. But I'm wondering if anyone here has already done this before?

Cp1 · 09-13-2010, 05:19 AM

why not just regular weld it?

sen2two · 09-13-2010, 02:29 PM

Welding on the plates is a lot easier said than done. Not that it's impossible, but it's not recommended.

I already checked everything with a spare rotor. It all checks out fine. I was just being over cautious. Side seal leading edge stays supported the entire time.

classicauto · 09-14-2010, 01:06 PM

Should work. Obviously not ideal, and obviously there's a chance of failure...but it should work. Just build it up nice on the inside of the passage a good amount larger then the hole.

Nismo · 09-14-2010, 02:19 PM

Devcon, expensive, Racing Beat sells it, and has characteristics similar to Irons. It's whats used to fill in the intake ports when using a Peripheral Port.

http://racingbeat.com/photos/19994.jpg

When building a peripheral port engine it is necessary to fill the intake ports on the cast iron side housings with a material that will form a tough, durable metallic mass - Devcon Plastic Steel Putty (10110) is the material of choice. Easy to use and requiring minimal clean up, Devcon cures at room temperature. Each container of Devcon will be sufficient to complete several engines.

$49.75/Tub

Max777 · 09-20-2010, 04:02 PM

wow, this is awesome! I didn't know that there is something like this available!

08-12-2010, 02:46 PM	#1
sen2two KTEC Join Date: Jan 2009 Posts: 642 Rep Power: 0	Made a little boo boo I had a spare center iron I'm using for a cheap experimental motor. So when it comes to experimenting, I was pushing the limits of the porting. I actually ported the bottom edge of the bridge port deep enough to create a small hole into the coolant passage. The hole is maybe a 1/6" of an inch around. I want to know if i can just JB weld it shut (as i was planning on JB welding a few areas anyways for better transition). This is an NA motor and will not see boost. I know that JB weld will withstand the heat, but will it keep the water from seeping in under pressure? How much pressure do the coolant passages actually see? I don't imagine it being much... __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

08-12-2010, 06:05 PM	#2
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	Well, what pressure of radiator cap do you use? Add 0.46 psi per foot of elevation below the cap. I would worry slightly about the difference in the thermal expansion rate of the JB weld and steel. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

08-12-2010, 06:22 PM	#3
sen2two KTEC Join Date: Jan 2009 Posts: 642 Rep Power: 0	I have (and many other) have used JB weld in the ports. So I'm not worried at all about the JB weld bonding. The only thing that worries me is if it will keep the coolant from seeping in. I have used it to block water/coolant in manifold/TB's and other things. But never to block water in the motor. I'm pretty sure it will. But I'm wondering if anyone here has already done this before? __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

09-13-2010, 02:29 PM	#5
sen2two KTEC Join Date: Jan 2009 Posts: 642 Rep Power: 0	Welding on the plates is a lot easier said than done. Not that it's impossible, but it's not recommended. I already checked everything with a spare rotor. It all checks out fine. I was just being over cautious. Side seal leading edge stays supported the entire time. __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

09-14-2010, 02:19 PM	#7
Nismo 400WHP or bust Join Date: Mar 2008 Location: Kincardine, Ontario Canada Posts: 165 Rep Power: 18	Devcon, expensive, Racing Beat sells it, and has characteristics similar to Irons. It's whats used to fill in the intake ports when using a Peripheral Port. http://racingbeat.com/photos/19994.jpg When building a peripheral port engine it is necessary to fill the intake ports on the cast iron side housings with a material that will form a tough, durable metallic mass - Devcon Plastic Steel Putty (10110) is the material of choice. Easy to use and requiring minimal clean up, Devcon cures at room temperature. Each container of Devcon will be sufficient to complete several engines. $49.75/Tub __________________ 1986 GXL- Being built with a 13B RE... http://www.rotarycarclub.com/rotary_...ead.php?t=9602 1986 Base-RB Exhaust, HKS filter, Solid Aluminum motor mounts, S5 TII motor, ACT Clutch, HKS SSQV, Light Weight Flywheel, Haltech E6X, 720cc 2ndaries, Koni Yellows, Tein Springs Koyo Rad, 250 WHP 230 FTLBS Stock turbo, and stock IC at 10psi. RIP!! The daily bitch- 1995.5 Toyota Tacoma- Trueflow airfilter, and Bilstein HD shocks. 2009 Toyota Corolla "S" TRD Filter... 40MPG

09-20-2010, 04:02 PM	#8
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 19	wow, this is awesome! I didn't know that there is something like this available! __________________ Rotaries:They are NOT that complicated!