Setting up and balancing quad twin Jenvey ITB's

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mgbloke
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Setting up and balancing quad twin Jenvey ITB's

Post by mgbloke »

Hello all.

can anyone tell me a method or point me to a method for setting up the idle and balancing my ITB's. I have a vacuum gauge just cant remember the procedure.
Cheers

Mark



JP.
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Post by JP. »

Warm engine. ( 20 mile drive so engine is fully warmed up en valve clearance is fully equal ).

Fast idle ( 1500 rpm ) so all throttle cable and rods slack is out.

Start at the last ITB and work your way back to the first one on the throttle cable.
'73 Ford Capri. 3.5 RV8, Magnacharger 110 Supercharger, Merlin F85 Heads, Water/Methanol Injected
'73 Ford F250, 6.7ltr V8
Building a GT40 mk2

mgbloke
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Post by mgbloke »

Thanks JP
My jenveys have an air bypass valve on each one for adjustment. Presuming the butterflies should be fully closed and balance airflow with the bypass.
Just wondered if there was a certain procedure.

Cheers

Mark

unstable load
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Post by unstable load »

Call them up and ask them for a manual on how to set them up.
Cheers,
John

mgbloke
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Post by mgbloke »

Yes I have tried emailing them but as yet no reply.
will give them a ring.

Cheers
mark

JP.
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Post by JP. »

mgbloke wrote:...Presuming the butterflies should be fully closed and balance airflow with the bypass.
..
Butterflies should be slightly open, hence the 1500rpm I mentioned.
Fully closed is idle only and you want all the throttle blades open simultaneously.
'73 Ford Capri. 3.5 RV8, Magnacharger 110 Supercharger, Merlin F85 Heads, Water/Methanol Injected
'73 Ford F250, 6.7ltr V8
Building a GT40 mk2

kokkolanpoika
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Post by kokkolanpoika »

This is what i did..

Image

8x vacuum cauge´s. Thanks for my friend sponsoring those cauge´s very cheaply..

I have to setup my idle vacuum for emission reason´s, then i check that high rpm vacuum is similar both side.. approx 1500rpm. In my mind better option is a road test..
I also have got special tool that i can measure throttle plate and body clearance when they are fully open..
Timo

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