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914World.com _ 914World Garage _ heat exchanger question

Posted by: TROJANMAN Feb 3 2005, 12:08 PM

can i swap my 75 2.0 HE's with a pre 75 car? and if so, will this help performance? and...........does anyone have some? and.............would anyone want mine?
thanks in advance

Posted by: Headrage Feb 3 2005, 12:13 PM

Yes you can. I am doing the same thing to mine. If you look at the '75-'76 H/E's you will notice that the exhaust goes forward first then to the back which I understand dosn't flow well. You will need to also replace all of the tubes that go to the heater flapper valves and the exhaust hanger, plus a new muffler.

Posted by: TROJANMAN Feb 3 2005, 12:14 PM

are these all items i can scrape from a parts car and easily install, or will i need to make modifications?

Posted by: Headrage Feb 3 2005, 12:17 PM

QUOTE (glstrojan @ Feb 3 2005, 10:14 AM)
are these all items i can scrape from a parts car and easily install

It's my first time so I hope so. Actually I believe as long as you can find the parts everything should bolt up with no problem.

Posted by: Root_Werks Feb 3 2005, 04:15 PM

Shameless plug here.

If you live in CA, don't you have to keep the ability to have the CAT on for the 75-76 914's?

Anyway, I have a Bursch header w/cat bypass. Used, nice shape. PM me if you want it cheap. Just in case you decide to stick with the stock set up.

Yeah, the 73-74' 2.0 is the better set up by far.

Posted by: Dave_Darling Feb 3 2005, 04:26 PM

Do a search. I posted a list of what you need from the earlier cars a little while back...

--DD

Posted by: double-a Feb 3 2005, 05:00 PM

i referred to that list a few weeks ago when i began looking for the necessary parts.

~a

Posted by: MarkG Feb 3 2005, 05:09 PM

quote" To use the 2.0 heat exchangers (or SSIs) on a 75-76 914 (either 1.8 or 2.0), you will need:

The 2.0 exchangers
The 2.0 muffler
The 2.0 muffler hanger
2 muffler gaskets
4 2.0 exhaust gaskets (the copper rings)
8 exhaust nuts (usually best to replace them)
All of the heater hardware except for some hoses. That means--

• 2 S-shaped ducts from the fan shroud to the exchangers
• 2 J-shaped tubes from the large holes in the engine tin to the S-ducts
• 2 Extension pipes from the exchangers to the flapper valves
• 2 Flapper valves
• 2 Hoses from the flapper valves to the heater channels in the chassis

You can actually use the 75-76 flapper valves and the hoses; but the flappers can be a real pain to remove from the late exchangers (or the early extension pipes), and the hoses often need to be replaced anyway.

If you don't get the heater hardware, the exhaust will still function--but the heat won't."

from Dave's post.... will be doing this myself someday....

Posted by: Rhodes71/914 Feb 3 2005, 07:34 PM

I am about to do this as well and will be moving everything from my 1.7 to my 75 2.0.

The question I have is what copper exhaust gaskets to use the 1.7 (since the HE are 1.7s) or 2.0 (since the heads are 2.0)

Posted by: Dave_Darling Feb 4 2005, 02:19 PM

That points out one error in my post above. The copper gaskets go with the heads, not with the exchangers. So you need the copper gaskets for whichever cylinder heads you have.

--DD

Posted by: Dominic Feb 5 2005, 11:48 AM

QUOTE (glstrojan @ Feb 3 2005, 10:08 AM)
can i swap my 75 2.0 HE's with a pre 75 car? and if so, will this help performance?

Yes it will definately help with performance, the earlier cars had 95HP and your car has 87HP with the smog crap and restrictive exhaust. Disconnect the smog pump, cap off the smog injectors and put the early exhaust system on your car for some free HP...Well maybe not free but it's just waiting to be let out. If you don't need the heat, you could probably sqeeze a few more ponies out with a header.

FREE HORSE POWER

Posted by: Rhodes71/914 Feb 5 2005, 12:13 PM

QUOTE (Dave_Darling @ Feb 4 2005, 12:19 PM)
That points out one error in my post above. The copper gaskets go with the heads, not with the exchangers. So you need the copper gaskets for whichever cylinder heads you have.

--DD

Thanks Dave, luckily I ordered the right ones.

Posted by: scott thacher Feb 5 2005, 12:21 PM

two tricks to get the HE to seal to the head better are:

take a long file and file the HE where they go to the head so they are flat and parallel

also take the copper sealing ring and heat it up with a propane torch as haot as you can get it with out melting it, then drop it in to a bucket of water, this will soften it