TheSamba.com :: View topic - Aftermarket Exhaust / stock heat exchangers

Wed Mar 17, 2010 9:02 am

I have an over-the-top exhaust from ISP and love it. But routing fresh air from the shroud to the heat-exchangers has always been a problem. The path from one to the other has to be a pretty tight "S" and the hot exhaust pipe is right there, which makes use of anything that will melt a problem.

I do have some bits from a stock exhaust system but I am reluctant to modify them as they will probably be of interest to someone setting up a stock system.

What have you other guys done with this problem?

Max

Wed Mar 17, 2010 9:20 am

I think Michael "!!!!!" Fisher had some airplane type tubing that works and looks good, try searching for topics on the over the top exhaust

Wed Mar 17, 2010 9:42 am

I've been using 60mm preheater hose (the 'Slinky wrapped in tin foil' type) with no exhaust heat related issues.

You should be able to find it at a local Auto Parts store.

Wed Mar 17, 2010 10:26 am

I welded up a pair of S shaped pipes that clamp between the shroud and the heater boxes. No more slinky hose bullshit.

Wed Mar 17, 2010 10:50 am

JSMskater wrote: I welded up a pair of S shaped pipes that clamp between the shroud and the heater boxes. No more slinky hose bullshit.
I'm not afraid to weld. Got a picture?

Max

Wed Mar 17, 2010 3:47 pm

I have been using the aircraft spruce SCAT tubing and it still looks as good as new. It sits on my exhaust pipes and hasn't even shown signs of burning.

Wed Mar 17, 2010 4:28 pm

Max I used the elbows in your bottom picture and went from there to the heater boxes with the typical flexible heater tubing that you can get from ISP west or any other parts place for that matter. that way i could also hook up the small tubes to the mixer boxes going into the car. it is a tight fit and is very close to the exhaust, but so far so good. i havent had them on for a very long time yet but im going to keep an eye out on them to see how well they hold up. also as a side note i got some flexible metal hose from mcmaster carr for the small tubes that hook to the elbows. 5262K19 (if i remember the size right) is the part number in there catalog if you want to check it out. hope this helps

Wed Mar 17, 2010 6:39 pm

Are the rubber junctions needed to use the stock elbows still available?

Max

Wed Mar 17, 2010 6:56 pm

BSQUARE wrote: I've been using 60mm preheater hose (the 'Slinky wrapped in tin foil' type) with no exhaust heat related issues.

You should be able to find it at a local Auto Parts store.

X2

Wed Mar 17, 2010 7:14 pm

Wed Mar 17, 2010 7:41 pm

yes ISP has the rubber elbow connectors. that is where i got mine. do you have the two tubes that go under the head tin that connect to the elbows?

Wed Mar 17, 2010 7:51 pm

No I don't. I imagine ISP has those too?

Max

Wed Mar 17, 2010 8:13 pm

im sure they do, but you might find them cheaper in the classifieds. here is a couple of ads in the classifieds now. there is a right and left side so make sure that is what you get. just in case you dont know these hook directly to the elbows via a wide clamp and then to the front of the cylinder tin with screws. i had to learn all of this while looking for the parts myself. by the way the heat in my notch works very well. i have to cut it on and off because it gets really hot in the car. i think i have one extra tube that you can have, but you would have to find one for the other side. im not sure which side mine goes on, but if you want it let me know. and the the flexible tubing i posted about earlier works great, but is not factory correct if that is what you are wanting. oh and i am using the over the top from isp also.

http://www.thesamba.com/vw/classifieds/detail.php?id=936178
http://www.thesamba.com/vw/classifieds/detail.php?id=695885
http://www.thesamba.com/vw/classifieds/detail.php?id=858718

i went back and took a better look at the ads and the last one looks like what you need going off of memory. if i remeber right one has a long tab and one with a short tab like you can see in the picture to mount them to the tin. the one with the long tab is kinda strange to me. when you see it you would think it is bent away from the tube but it isnt thats just how it is made. you will see what i mean when you look at it. i bent it back in on one of mine and found that it would not mount correctly so keep an eye out for that. hope i explained myself well enough if not let me know.

Wed Mar 17, 2010 8:32 pm

Thanks.

I am not creating a factory-correct car by any stretch. The new engine is a 1776 with a "Berg Special" 42mm DCNF intake system and other goodies. Like the ISP exhaust.

I've even thought about cutting the outer skin of the stock heat exchanger, rotating the section with the air intake 90º and rewelding it. That is still an option. I've already put flanges on them, so they aren't really stock anymore.

Max

Wed Mar 17, 2010 8:41 pm

sounds good!!! let us know what you come up with.

Wed Mar 17, 2010 10:02 pm

Those pipes are also early and late. Depends on the length of the mounting bracket.
But you can make either work.

Thu Mar 18, 2010 7:14 am

Russ, i wondered about that but wasnt sure.

Thu Mar 18, 2010 8:33 am

Houstonr wrote: I have been using the aircraft spruce SCAT tubing and it still looks as good as new. It sits on my exhaust pipes and hasn't even shown signs of burning.

I think this is sold as 58mm.

Thu Mar 18, 2010 8:45 am

Good to see you back Mike.

Thu Mar 18, 2010 8:50 am

Thanks Russ! 10 days in the Hospital with Pneumonia Will slow you down a little. It will prolly also end your "addiction" to Smoking!