Heat Exchange Hose Questions

junior912 · 06-17-2004, 03:09 PM

can anyone give me a link or directions on how to install the heater hose in the engine bay and also what size hoses?

Morrie · 06-17-2004, 04:51 PM

Euro heat exchangers or US spec?

Morrie

Sweetheart912 · 06-18-2004, 05:50 AM

At the very top center of your engine shroud you should have a clip or bar @3" long of a spring steel material. It is attached to the shroud. Either attached, or in your parts box,you should have a black painted metal "T" (roughly 3.5x3")with 2 openings the same size on the left & right of the T & one larger one at the back/bottom of the T. The T is held to the clip on the shroud with 2 radiator clamps & in the direction of the bottom of the T facing the rear seats. The L&R smaller diameter openings go one to each air cleaner (stock ones). You will see the teats on the air cleaners. The rear larger diameter hose goes behind & around the engine & attaches to a tube that sticks up @.5" on the right side of the frame in the engine compartment.( on the 1-2 cyl side.). All are held by radiator clapms (thin ones-not the fat US type-but the US type will do unless you are showing the car for originality).

The tubes are a black paper outside /metal foil type inside and are of old VW vintage. Doing this from memory, so I can't recall the size off hand, but I know hoses most VW suppliers have are either too small or too big for our application. Take the T to NAPA or a parts house & try out different sizes to get your fit....or call Stoddard or Pelican or some Porsche parts place & order them (usually more expensive).

Note on some models you will need a few inches of this smaller diameter hose for the carb preheaters also (if you use them).

Sorry I don't have a T/912 handy to measure for sizes. Maybe some else can measure one if you need exact dimensions. This should get you close.

Morrie · 06-18-2004, 06:02 AM

OK, are you talking about the carb preheat hoses or the heat exchanger hoses. Big difference. If its the preheat hoses, unless you are going concours or plan to drive when it is very cold, I would recommend not hooking these up. The best arrangement is the coolest air you can have entering the carbs (with in reason) and the warmest air exiting. Think about american iron.... they talk about wrapping the headers and cold air induction.....

Morrie

Sweetheart912 · 06-18-2004, 09:46 AM

Morrie I was answering the asked question about "the heater hose in the engine bay". Heat exchanger hoses are under the car & run from the back of the exchanger to the heater "can" at the body. Yes, big difference so what are you referrring to? Cheers.

Morrie · 06-18-2004, 10:13 AM

This is the hose I was talking about. If you've never seen a euro spec car, then my question wouldn't make sense.....

Morrie

junior912 · 06-18-2004, 10:51 AM

you can copy the picture and draw on it and post it to show me how mine needs to be, also in your picture i noticed that there is a black hose on the passenger side of the engine bay connecting up to the top of the engine bay.

[img]
http://forums.pelicanparts.com/uploads3/engine1087584675.jpg[/img]

Morrie · 06-18-2004, 11:16 AM

OK.. busy day... nasty artwork but you will get the idea.

There is a hose that exits that plugged opening on the passengers side of your shroud. It comes down to the rear tin and moves across the back to the rear of the support bar. There is a clamp that goes in the middle. It hops the rear support on the drivers side and goes down and connects to the opening of the same diameter going straight down to your drivers side heat exchanger.

There's a little short hose that goes straight down out of the plugged duct on the passengers side and into the passengers side heat exchanger.

Now. That hose you see in the passengers side rear. That guy is also present on the drivers side and feeds from the heat system to your rear window, providing a weak sort of defogger action.

Make sense?
Morrie

Sweetheart912 · 06-18-2004, 11:17 AM

In the engine bay I did not mention that hose as it is so obvious a hook up because that hose fits only where it is intended to fit; AND they are such anomalies anymore. They were anomalies in 1968 too when I first saw one. They were only manufactured for use in Germany & Sweden because of laws in force at the time. "Euro's" are correctly called the 356B/T6 model-even in 912's.

Reckon I never considered that large hose a heat exchanger hose as it moves no "exchanged" air, as those under the car do. It ducts forced "fresh" (not exchanged) air from the the shroud through the massive exchangers and into the body heater system. The export version uses the cooling air over the cooler & cylinders into the "flapper box" where "fresh" shroud air is now known as "exchanged"preheated air and routed either into the car heater system, or it is vented out.

Morrie · 06-18-2004, 11:30 AM

sorry if I got you riled 'sweetheart912'. wasn't my intent. you's lota smarter dan me i guess....

junior912 · 06-18-2004, 11:36 AM

Thanks alot guys, also one more question, what exact does that big hose heater hose do? does it release engine heat or what?

Sweetheart912 · 06-18-2004, 11:40 AM

You know Morrie, that was uncalled for.

Morrie · 06-18-2004, 11:40 AM

The big hose moves air from the blower in the shroud down and through the heat exchanger under the car, through the true heat exchanger hoses, and if your flapper boxes are in the right position, out into the passenger compartment.

If you don't want heat or want to convert to US spec heat like I did, I can show you a clean way to make the change for little investment.

Morrie

junior912 · 06-18-2004, 11:43 AM

please do

Morrie · 06-18-2004, 11:52 AM

Aren't you selling the car anyway 'Junior912'? Wassup with that?

junior912 · 06-18-2004, 12:42 PM

That is true but till then i'd like the make the car as enjoyible as possible, Im a prefectionist and it bothers me when something isnt hooked up correctly.
Im sure the buyer would also appreciate the fact that the car is in tip top condition. I've done alot to this car already but it can always be better.

Morrie · 06-18-2004, 12:58 PM

In that case, pick up an OE paper hose for under 10 bucks to go across the front, and you can use foam pipe insulation from the hardware store to replace the defroster tubes. You'll be all set!

Morrie

junior912 · 06-18-2004, 01:04 PM

thanks

schoward · 10-22-2006, 12:20 PM

Sorry to resurrect an old thread - but have an obscure 912 question related to this topic.

If you see above, someone has drawn some hoses on a picture in an 'nfl sunday' style.

Can anyone tell me the part # for the little hose on drivers side that connects the engine/shroud to the rear defogger on a 68 912?? Cant seem to find it on our host's parts catalog.

any thoughts on where to get one?

thanks in advance