V12 Throttle Body sync made easy
#1
V12 Throttle Body sync made easy
Just thought I would add this how to - it can be difficult to get the throttles properly synchronized running from one bank to the other.
This makes adjusting throttle body opening easy.
First step is to adjust ONE throttle for 0.002" clearance at the top between the butterfly and housing with the throttle closed. Then remove any backlash in the rod. I did the left first.
The first pic shows inserting 2x 2mm bits of steel to hold the throttle slightly open.
Next pic is the LH throttle body stop measured with feeler gauges with the 4mm shim in the pedestal. Once this was done I moved to the RH side and set the opening the same with feeler gauges.
Now both throttles open within a poofteenth of each other.
This makes adjusting throttle body opening easy.
First step is to adjust ONE throttle for 0.002" clearance at the top between the butterfly and housing with the throttle closed. Then remove any backlash in the rod. I did the left first.
The first pic shows inserting 2x 2mm bits of steel to hold the throttle slightly open.
Next pic is the LH throttle body stop measured with feeler gauges with the 4mm shim in the pedestal. Once this was done I moved to the RH side and set the opening the same with feeler gauges.
Now both throttles open within a poofteenth of each other.
Last edited by warrjon; 07-26-2012 at 05:59 AM.
The following 3 users liked this post by warrjon:
#2
#3
I'll edit the post it is a bit confusing.
#4
#5
#6
Just thought I would add this how to - it can be difficult to get the throttles properly synchronized running from one bank to the other.
This makes adjusting throttle body opening easy.
First step is to adjust ONE throttle for 0.002" clearance at the top between the butterfly and housing with the throttle closed. Then remove any backlash in the rod. I did the left first.
The first pic shows inserting 2x 2mm bits of steel to hold the throttle slightly open.
Next pic is the LH throttle body stop measured with feeler gauges with the 4mm shim in the pedestal. Once this was done I moved to the RH side and set the opening the same with feeler gauges.
Now both throttles open within a poofteenth of each other.
This makes adjusting throttle body opening easy.
First step is to adjust ONE throttle for 0.002" clearance at the top between the butterfly and housing with the throttle closed. Then remove any backlash in the rod. I did the left first.
The first pic shows inserting 2x 2mm bits of steel to hold the throttle slightly open.
Next pic is the LH throttle body stop measured with feeler gauges with the 4mm shim in the pedestal. Once this was done I moved to the RH side and set the opening the same with feeler gauges.
Now both throttles open within a poofteenth of each other.
That "poofteenth" is going to drive Google nuts. AAH the Aussie lingo, so special.
The following users liked this post:
Greg in France (06-29-2020)
#7
You will see that the cabin end of this butterfly actuating rod is set in a hole in a triangular bracket. It is into this hole that the black throttle rod bushing fits.
The following users liked this post:
Grant Francis (06-29-2020)
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#9
Join Date: Jul 2010
Location: Austin tx and Daytona FL.
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i do that differently, i get the engine up to temperature after a rough setup, and heat gun measure down pipe temps, NO catalyics!
then adjust linkage slowly to get them even temps, make a drive and measure again, sometime a slight readjust!
works for me?
a made bushings from aluminum rod, and a lathe, any small shop could do them!
then adjust linkage slowly to get them even temps, make a drive and measure again, sometime a slight readjust!
works for me?
a made bushings from aluminum rod, and a lathe, any small shop could do them!
#10
hope this helps.
The following users liked this post:
Grant Francis (06-30-2020)
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chrisleg
XJ6 & XJ12 Series I, II & III
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