Weekend road trip, may need heat

[ghamilton]

Bride and I heading to upstate New York next weekend for the Hemmings Concours.

It can be cool this time of year in New England and upstate NY.

My heater flapper boxes are pretty bad, they won't shut off so I have just left the hoses of all Summer.

I did hook them back up today and went for a toasty drive.

Some ideas I'd like to pass by the board.

Since it is so hard to hook the hoses back up unless the car is up could I leave them hooked up and just disconnect the black plastic hose from the outlet of the fan housing to the booster fan if it's warm out?

Would this force too much of the heat from the heat ex changers back in to the engine compartment and cause the car to run hot?

I have a plastic container that fits perfectly over the fan outlet, but of course same questions arises, will that return too much heat to the exchangers?

Your thoughts please.

[fanaudical]

I wouldn't disconnect at the outlet of the engine fan - that air does serve the functional purpose of cooling the exhaust.

[Bob Kontak]

Originally Posted by ghamilton

Your thoughts please.

I would craft a plug system inside the engine compartment.

Whatever that may be. It should be simple but unpretty. Soup cans, etc. to plug but then the ability to re-connect.

Do not allow the precious bodily fluids of the BIG fan to escape through the loose heater hoses in the engine compartment. Make the air pass over the oil cooler without escaping.

Plug the heater flow to the exchangers when warm out. Connect when cold.

[Bob Kontak]

Originally Posted by fanaudical

I wouldn't disconnect at the outlet of the engine fan - that air does serve the functional purpose of cooling the exhaust.

Who said this? I mean if you have the story straight that the exhaust requires the big fan and/or the electric fan to cool it with air flow, speak volumes, please. I don't know for sure and I mean that.

I see no way German engineers would have designed a system that requires external airflow over the exhaust pipes to maintain its integrity.

[Rawknees'Turbo]

^^^

Bob, I've never tried it with my Turbo (don't see how it would be any different, however, since the design is the same), but way back in my early 20s, I had a 914 that I took on a test drive after doing some work on it - had left the air supply hoses disconnected from the heat exchangers, and they got so ungodly hot that the pinging sounds, and odor (like superheated metal - not burning oil) coming off of them when I parked basically scared me. In other words, the exchangers get way too hot if air is not blowing through them when the engine is running.

[ghamilton]

Like this?

[pors1968]

I would not disconnect hose. Heat exchanger get realy hot without air flow even with fan noy running you have air flow from alternator fan.

[brianlay]

The heat exchangers don't need air. They just get hot...may actually help to burn oil residue off
I often don't have air to my SSIs for the whole summer season

[fanaudical]

Originally Posted by Bob Kontak

Who said this? I mean if you have the story straight that the exhaust requires the big fan and/or the electric fan to cool it with air flow, speak volumes, please. I don't know for sure and I mean that.

I see no way German engineers would have designed a system that requires external airflow over the exhaust pipes to maintain its integrity.

First off, I may be perpetuating a Porsche myth without proper reference. I've heard mixed opinions/arguments about this topic. A few (whose opinion I tend to trust) have stated that running the heat exchangers without cooling air is less than desirable. Here's a couple of other posts where this is referenced:

What do you when you remove heater, but not heat exchangers?

Unvented heat exchangers cause engine wear?

[pors1968]

Originally Posted by fanaudical

First off, I may be perpetuating a Porsche myth without proper reference. I've heard mixed opinions/arguments about this topic. A few (whose opinion I tend to trust) have stated that running the heat exchangers without cooling air is less than desirable. Here's a couple of other posts where this is referenced:

What do you when you remove heater, but not heat exchangers?

Unvented heat exchangers cause engine wear?

I am more worry about oïl flash point in heat exchanger.It may burn oïl residu or your car .We all know porsche engine leak and most time leak in heat exchanger .Flash point is 420-485F .It only take hot day and some spirit drive.

[gomezoneill]

Where's the concours, I live upstate have not heard about it?

[86 ssinit]

I had this same problem with the 83 when we first got it. Lifted the car some wd40 sandpaper and a dremial tool I freed them up. With my son moving the levers finding where they were sticking we got them working and there still working. Takes a little time but you may be able to clear them.

[mhackney]

It's the Hemmings Motor News Concours held in Sarasota Springs north of Albany.

https://www.hemmings.com/events/concours

[ghamilton]

Boxes open and close, have new cables, but the flaps and parts of the inside of the boxes are missing.

Can't shut off the heat.

[eastbay]

new boxes are pretty cheap these days

[gomezoneill]

Originally Posted by mhackney

It's the Hemmings Motor News Concours held in Sarasota Springs north of Albany.

https://www.hemmings.com/events/concours

Got it. Saratoga springs. I live 10 miles from there it's at the SPAC automobile racing museum. Just happened to drive by there yesterday and saw the signs.