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Posted by: PORobinSCHE Oct 8 2006, 06:28 PM

Greetings, i have a fan mounted on top of the left side of the motor. i am guessing it is for forcing air thru the heating tract. wouldn't that also suck in any fumes from the engine compartment?
I don't think i have much need for the heating system. even toying with trading out the exhaust that has the heat exchangers to just a plain header.
i am wondering if the fan would be any help directing air to the motor instead. or should i just remove the whole thing?

thanks

Robin

Posted by: ChrisNPDrider Oct 8 2006, 10:01 PM

Yeah, when the engine is at low speeds the fan forces most of the air for heating/defrost down through the J tubes through the heat exchangers (HE) through the valve flapper box thingys and into the heater tubes in the longs. The only way exhaust should enter is if your heat exchangers are leaking on the insides or at the seams and sucking in exahust there. I just removed and cleaned out my J tubes and ducting during SS HE install and there was a lot of crud in there. When I had the old rusty leaky HE I took the tube from the flapper to the firewall off and covered that hole to prevent any bad gases entering the cabin. Those crudy steel HEs were heavy! SS HEs and headers are light! I don't think blowing air into the stock intake would help much.

Posted by: PORobinSCHE Oct 9 2006, 07:08 PM

guess i'll just remove the blower and plug the holes.

thank you

Robin

Posted by: PORobinSCHE Oct 10 2006, 06:28 PM

hello,,, well pulled the blower off tonight. i am getting warm air from the HE tube into the engine compartment. why??? do i need to cap the pipes? or just get the saw out and cut off the heat exchanger?

thanks again

Robin

Posted by: 2-OH! Oct 11 2006, 01:48 PM

Yes...You will get heat into the engine compartment from the H/E's unless you cap off the J-Tubes...The motor fan blows into the H/E's via the engine cooling blower fan at the front of the engine...


2-OH!

Posted by: PORobinSCHE Oct 11 2006, 06:19 PM

anyone have a nifty idea on how to plug the holes?

Posted by: bd1308 Oct 11 2006, 06:24 PM

Expanding foam will definately plug hoes

Posted by: alpha434 Oct 11 2006, 06:26 PM

Easy. Use a force field generator to creat a force field and duct the cool air from outside in.

It all depends on quality. Low quality=duct tape. High quality=aluminum plate, or something else.

Posted by: PORobinSCHE Oct 11 2006, 06:47 PM

will heat be an issue ? i have plenty of spray foam available.

Posted by: bd1308 Oct 11 2006, 07:23 PM

I think the foam might expand too much and impede flow

Posted by: 2-OH! Oct 12 2006, 01:15 PM

I have one cap I will donate...All you add is a screw clamp...

It fits on top of the J-Tube with a screw clamp and your done..But you will need to find one more for the other side...

With all the tear-downs, scrapping, turning into racers, someone in the classified section is bound to have one more...It's such an insignificant piece, most folks are probably throwing them away...

Give me an address and let me know...

OH yea...one other thing...Removing the electric fan, capping tubes, etc...will mess with your defrost capabilities, even in warm, humid climates...

2-OH!

Posted by: 2-OH! Oct 12 2006, 01:22 PM

Oh yea...Also, DO NOT use foam...The motor/H/E's get too hot...My opinion would be that you would be making a mess, smell, fire hazard...

2 cents...

2-OH!

Posted by: bd1308 Oct 12 2006, 01:35 PM

Yeah, that foam thing was more of a comical suggestion. I see a bunch of toxic smoke, and a impeller full of foam.

Posted by: PORobinSCHE Oct 12 2006, 05:09 PM

thank you for the cap! you'll be nominated for knighthood soon!!

pm sent

Posted by: Dave_Darling Oct 13 2006, 12:51 AM

IIRC, a spray can lid fits almost perfectly... Plus they're available in a wide variety of colors!!

--DD

Posted by: McMark Oct 13 2006, 01:28 AM

Ya beat me to it Dave. Old school trick.

Posted by: PORobinSCHE Oct 13 2006, 06:39 PM

is heat going to be an issue on the plastic caps? then again, i do have plenty of various colors!

does anyone else have a metal cap. i have one on the way....

Posted by: Dave_Darling Oct 13 2006, 06:52 PM

The stock ones (used on the 73-74 cars to block off the passenger's side J-tube) were plastic. Probably not the same as a spray-can lid, but still plastic. I would be a bit surprised if a lid melted there--at least, in the short term. Probably if you ignore it for 5 years...

--DD