Coolant leak after manifold swap

[eddy314]

I swapped out my 79 manifold and carb with a 32ADFA and an 1800 intake a month ago. I plugged the open exhaust port near the belt, and connected the water choke hoses properly. I noticed an obvious improvement right away. It runs great. I have a nagging issue - small coolant leak near the left of the manifold as your looking at it, (front of car). Why is there even coolant here at all? Is there another port I need to plug? Thx

[Mathew26]

There is a coolant port towards the front of the engine on the manifold and then another right in the middle of the manifold.

[mbouse]

the coolant is there to remove heat from the fuel mixture flow area. did i say that right?

did you use some sealant on either side of the gasket, especially around the coolant ports?

[So Cal Mark]

Mike, you've got it backwards. The coolant flow through the intake warms the mixture for better atomization of the fuel

[mbouse]

Mike, you've got it backwards. The coolant flow through the intake warms the mixture for better atomization of the fuel

thanks for the correction.... knew it affected the atomization of the fuel to the mix, but always thought that cooler was better.

[azygoustoyou]

So if I getting this right. On a 1800 engine, It would be best to leave the coolant running to the intake on the back port of the valve cover when you change to a 32/36 dfev

[mbouse]

valve cover? do you mean cam cover?

32/36 DFEV is an electric choke carburetor. you will need to either swap to a 1974 or earlier intake manifold (from a manually choked carburetor setup) or block that tube that originally fed a water choke. or, you could run a loop between the two intake/output tubes from the old water choke system.

[mbouse]

Mike, you've got it backwards. The coolant flow through the intake warms the mixture for better atomization of the fuel

i am perplexed. still working hard at swallowing all this. please assist me.
1. isn't the fuel already mixed and atomized BEFORE it hits the intake manifold?
2. if warm air is better, why do we struggle to introduce cold air into the air intake area?

please forgive my hijack of this thread. perhaps we should take the discussion elsewhere?

but for now...
Cold = Denser = More
More fuel + More Air = More power

hot manifold
Hot = less dense = less
Less Fuel + Less Air = Less Power

[So Cal Mark]

yes, let's start a new thread on theory rather than completely hijack this one

[azygoustoyou]

Sorry guys, it was my fault. I just get so excited sometimes. Thought I was learning something

[mbouse]

naw, my fault. i hijacked your thread. or, there were too many questions, and mark and i went off on a tangent.

you're really concerned about stopping the leak, right? what sealant did you use, and did you use enough..on both sides of the intake manifold gasket? i bet not. or, one or more of your fasteners is not torqued tight enough. double check all six fasteners.

there is no coolant into the cam covers or cam towers.

the tubes that fed the factory water choke must be plugged or looped together.

and that port all the way to the left, the one that the 1800 engine will not cover? yeah, that is an exhaust gas port which fed your 2000 EGR valve, it should not be leaking coolant...ever.

i love my 32/36 DFEV. send me an email to the address in my signature if you wanna talk about this conversion project further. i've helped a several guys thru this exact thing a time or two.

can you take a picture of the exact location of the leak?

[Fiat88]

i love my 32/36 DFEV. send me an email to the address in my signature if you wanna talk about this conversion project further. i've helped a several guys thru this exact thing a time or two.

I'm one of those guys! Mike's good.

[eddy314]

Thanks everyone, I don't mind thread going off in a tangent, interesting. I think Mr. Bouse figured it out. I was so anxious to get the new manifold on that I didn't use any sealant on the new gasket. The coolant ports in the rear are not a problem as I reused them to connect to the choke on the 32 ADFA. I'll have to remove the manifold and re-seal. Now that's the next question- which gasket sealer is prefered? Mike, I think I'll contact you direct because I have a bunch of little questions. We have a mutual aqaintance here in Indiana - Racydave. Thanks

[mbouse]

shoot, if you are in Indiana, why don't you just stop up this saturday. you can pull your intake and use my sealant (same stuff Jon Logan uses)..can't remember the name off-hand. Blue stuff that never hardens. works GREAT.

then you can point your finger at my project Spider and we can share an adult beverage or two.

Dave's a good guy. Shared coffee and jokes with him a couple of weeks ago.