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Setting up and balancing quad twin Jenvey ITB's
Posted: Tue Nov 22, 2016 4:22 pm
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
Posted: Thu Nov 24, 2016 6:39 pm
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.
Posted: Sun Nov 27, 2016 8:28 pm
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
Posted: Mon Nov 28, 2016 4:59 am
by unstable load
Call them up and ask them for a manual on how to set them up.
Posted: Mon Nov 28, 2016 9:28 pm
by mgbloke
Yes I have tried emailing them but as yet no reply.
will give them a ring.
Cheers
mark
Posted: Tue Nov 29, 2016 5:31 pm
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.
Posted: Tue Nov 29, 2016 5:43 pm
by kokkolanpoika
This is what i did..
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..