Heater box connection

I am wondering what people with CMCs have connecting the heater boxes to the tube from the subframe.

The manual shows "emission control" hose.

I wanted to use regular VW insulated, corrugated plastic ducts. Now it looks like they are too long.

Should I try to shorten them or use something else.

Someone mentioned the insulation helps reduce fan noise.

Take a look at these.
http://www2.cip1.com/ProductDetails.asp?ProductCode=VWC%2D113%2D255%2D355%2DC
This is what I use.
When the heat is turned on these tubes muffle the engine noise that get transmitted through the heater system on a pan based Speedster.

Greg

I've always wondered about those ducts....they're plastic right?
Will they melt from the heat?

~WB

these ducts:
http://www2.cip1.com/ProductDetails.asp?ProductCode=VWC%2D113%2D255%2D355%2DC
I've never had a problem with melting the ducts.
I have had those little bilge fans that you can add to the system melt. They'll melt if placed too close to the engines heater box.

Greg

Greg, this is what I have now.

My engine is out of the car now but it looks like these will be too long.

They are made for this purpose so I don't think we need to worry about them melting.

Michael,
While the engine is out of the car is a perfect time to see if you need to shorten the heater ducting tubes that go into the driver compartment. (The ones that are near the chassis torsion bar housing)
I found that mine were way longer than they needed to be. I used a cut-off wheel air tool to cut them shorter to accomodate the length of the Engine to body heater tubes.
If you have to, you can alter the length of the heater box muffler tubes you have. What do you have to loose?

Greg

Want great heat? Go to "Knowledge" and check out the post have there.

What little heat you have will be lost traveling through that cold, uninsulated metal heat sink (chassis). I suggest that you listen to drclock and others in the group and scrap the CMC plans.

Boston Bob E

Go direct from the heater box to the frame horns and use the center tunnel with a couple of vent... it will roast you out, see the knowledge section for details. ~Alan

Alan, I read that. In fact I suggested it to you a while back.

I don't think I want to get in to all of that with the body mounted on the pan.

It seems like the original arrangement isn't all that different than the original VW design with the heater channels along the side.

I have wondered about insulating the outside of the frame members that carry the heat.

When I finally do get it finished and am driving it I probably won't be driving on too many really cold days.

Thanks everyone for all the suggestions.

I guess great minds do, think a like !