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auto tranny leak - 1970 squareback
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donovjim
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PostPosted: Tue Jul 27, 2021 4:49 am    Post subject: auto tranny leak - 1970 squareback Reply with quote

'70 squareback - converted to dual EMPis and electronic ignition- tranny leak repaired now into the start up phase.

Im mechanical but far from a mechanic- doesnt help Im in eastern Canada and no one here has seen one of these since their adult grandkids were in diapers.

Earlier this year with help from you guys here i managed to remove the engine and tranny. Im at the final reinstall details now.... but as I search tech threads here and the www Im having an issue understanding what to do with a couple of hoses. a couple of questions..can you help?

Hose from the automatic transmission modulator valve ... Benley cant help as i have carb swap so what do i do with that hose now?
Vacuum advance on he distributor- I lost track of where that went at disassembly- where to direct that line?

'apreciate any help JD
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Mike Fisher
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PostPosted: Tue Jul 27, 2021 9:55 am    Post subject: Re: auto tranny leak - 1970 squareback Reply with quote

All dual carbs are supposed to have a vacuum balance tube between them.
You can drill/tap the EMPI aluminum intake manifolds to add matching outlets.
Remember you want the balance tube pointed to the back of the engine, so you drill & tap the manifolds differently.
Steel dual Solex manifolds have matching outlets on them.
Put a tee in it for vacuum balance tube for a third outlet back to your automatic transmission modulator valve.
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Multi69s
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PostPosted: Wed Jul 28, 2021 12:37 am    Post subject: Re: auto tranny leak - 1970 squareback Reply with quote

You can also run a very small vacuum line from the distributor to the balance tube. You will then be using manifold vacuum vs ported vacuum for the distributor. I am setup this way and really like it.

Image may have been reduced in size. Click image to view fullscreen.


As you can see from the graph, the distributor is advanced even at idle, but as RPMs increase manifold and ported vacuum becomes the same. What this did for my setup was to give me better throttle response down low.
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donovjim
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PostPosted: Wed Jul 28, 2021 4:25 am    Post subject: Re: auto tranny leak - 1970 squareback Reply with quote

Guys- that so far over my head you have no idea!

I have to do this in a non technical/ very simple way- I’m not able to drill and tap a manifold …. The car functioned well enough previously these 2 tubes went “somewhere”.

Im thinking the one at the distributor went to a (male) port inlet at the bottom of the left carb- I’m thinking the one from tranny went to a similar port on the right carb.

On the balance of probabilities- do you think this was the previous set up?
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