Dual to single plane,...

[wetminkey]

If I do this swap on my 1979 2000cc, can I buy a manifold that will block off the water connection to the head,...or do I need to find a manifold that accommodates that connection?
I think I'm seeing both for the '79 and '80 carbureted,...I don't think I'll need a water-choke, since I don't think I can get my hands on a 32/36 with water-choke,...I'll have to go electric,...
Thanks! Todd.

[wetminkey]

Ok. Let me rephrase my question,...
I expect to swap from my water choke carb to an electric choke carb, and install a single plane intake manifold,...
My 1979 Spider 2000 has it's dual plane manifold and ADHA with water choke. The 2000cc's head has a coolant outlet that connects to the manifold's thermocouples and the 28/32 ADHA's choke. It is at the rear of the manifold, and unique to the '79 and '80 carbureted engines (if I understand correctly).
My question is,...are single plane manifolds available for the '79 and '80 that will block off that coolant connection,...or will the only manifolds that fit my '79 2000cc engine have the connection (that I'll need to block off)?
I see a lot of single plane manifolds for sale and I wonder what exactly will fit the 1979 2000cc?
Thank you!
Todd.

[PaulC]

Todd
Reference #2 in the photo. That's the coolant connection I'll be dead ending when I install my single plane and adfa. My ADFA has a water choke but I'm changing to electric to simplify things.

[PaulC]

Could plug it with an aluminium rod and JB Weld.

[samakijoe]

The single plane manifold has better air flow due to the larger (single) opening below the Carburetor. I actually did a little grinding on the opening with a dremmel tool to match the base of the Carburetor opening.

If you go to Redline Weber I bet you can get a water choke conversation kit to most mod #.

[wetminkey]

OK, now I'm confused.
PaulC, I thought your's to be a '79 engine, and the manifold you are using is exactly what brought this question to mind.
Your intake manifold gasket must look like this:

But doesn't the stock '79 carbureted engine use this gasket, to accommodate the odd coolant outlet (to the thermostat complex and ADHA choke) at the rear of the manifold?:

The manifold you picture obviously does not extend far enough rearward to cover this coolant outlet,...
What am I missing,...?
samakijoe, converting to a water-choke is an interesting idea,...I'll have to check to see if Redline Weber has the capability of converting a DFEV to water-choke. Thanks.

[dinghyguy]

Todd,

I have a 32adfa on my single plane manifold on my 1979 with a water choke. It was that way when i got the car, so it is possible and seems to work fine.
So if you want i could perhaps try for some pix.....
cheers
dinghyguy

[wetminkey]

Thanks, Dan. You are absolutely correct, the water choke works well,...in fact it works best. The choke responds to engine coolant temperature (as a choke should),...
But right now I'm just trying to find out if BammBamm's intake will fit my engine (see pics in Parts For Sale). I'm waiting for a picture of the mounting flange. I found out that most Spider engines do not have the coolant outlet that my 1979 has at the rear of the head (see intake manifold gasket pictures, above), so now I'm skeptical,...
PaulC's coolant outlet comes off of a coolant passage near an airway, mine has an entirely different coolant passage, farther rearward,...(again, see manifold gasket pics, above).
Easy to think of simply swapping intake and carb,...but it can be just a bit more complicated than that!
You, and geospider, got me started on this,...and so now I'm doing it. Single plane and 32/36DFEV (maybe with a water choke conversion?). Just gotta get the right parts.
I recall that somebody said "do right by your Spider,..."
Cheers to you, my friend!

[wetminkey]

MY GOSH! That took a lot of work!
Just got done emailing extensively with Csaba at AutoRicambi,...the hole is not a coolant outlet, it is an EGR hole, and the single plane manifolds do not block it. It must be blocked off separately (I don't yet know how, but it's JUST exhaust gas recirc, and there's an unused bolt hole right below it!). Waiting to hear a response to my PM to geospider,...he may know.
Anyway, THAT'S what has caused me all the confusion,...
Thank you very much, all! Now I know Fiat intake manifolds pretty well,...
Todd.

[PaulC]

Todd,
Check this out too
https://www.mirafiori.com/forum/viewtop ... ngle+plane

[wetminkey]

Thanks, PaulC!
PaulC's link lists several ways to block the EGR,...
Oh, and BTW,...those pics of intake manifold gaskets are as seen from the head side. The EGR hole is at the front of the head.
I'll put a "pictorial" together as I work on this project,...I see lots of requests/need for pics of how this is done, but I'm not finding many,...

[PaulC]

Any ideas on how to remove the vacuum switch that's just behind the carb mounting flange (the one with two fittings on the top) on a single plane manifold?
I tried a wrench and rapping the wrench with a hammer but no go even after a soak with PB Blaster.
Just for fun tried to remove one of the thermo switches on the underside to see if it was even possible. But even with an impact wrench it was again a no go.

[wetminkey]

DRILL 'EM OUT!!



naw, just kidding,...
Sounds like they are there to stay.

[geospider]

Todd,
Sent PM this evening. I used a short hose for the water line in the back (the port that comes off the manifold) and threaded a screw in it with a clamp.
the EGR is at the front: passes right through the head. I blocked mine on the exhaust side where the recric tubing goes in.
would have pulled that from the ex manifold with a plug but there s no way that was coming out, so I a thin metal round plate and a solid gasket. no leaks.

[wetminkey]

Thank you, my friend! I got your messages.
Haven't sealed the deal yet,...waiting on busy BammBamm. Very soon.
And mine is also a stock '79,...although I had to plug (long ago) reed valve openings and their air cleaner opening, since I could not replace the old burnt out ones.
I'll work on a "pictorial" of the process, from start to finish, and post it. I'm pretty sure that I've got it figured out now, and that they'll be no surprises.
Thanks!