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Charlie J

Posts : 471
Join date : 2014-10-22
Age : 58

PostSubject: Throttle rod   Fri Mar 27, 2015 2:24 pm

Obviously this is a bit that requires not one jot of being fucked with, apart from replacing the rod ends when they wear. I have 2 sets of throttle bodies and they have slightly different lengths. Both rods had been tampered with ,one set by me after having read "something on the net" years ago and the other by the dyno guy. The set that came with the bike have just been overhauled and I changed the rod ends with brass ones. When I set the rod length for these TBs both butterflys were fully closed and the rod length adjusted so that it slipped on its balls without moving the butterflies. The adjusting screw was set around 1/2 of its adjustment. Although I did not remove the arms that the rod connects to, when I measured them their centres appear to be identical. In hindsight I should have asked EFI (the mob that serviced the TBs) to measure them when they had them apart.
I have seen the occasional mention of the rods on forums and some folk relate to geometry and their length but don't elaborate. So are the rods purely a mechanical device linking the TBs, whose length is only governed by the requirement of both butterflys to open simultaneously without running out of adjustment at the screw ? Cheers
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Posts : 1555
Join date : 2015-02-02
Age : 57

PostSubject: Re: Throttle rod   Fri Mar 27, 2015 3:45 pm

Hey Charlie,
I would have thought that so long as the Sacred screw position isn't touched, thats your zero point. Then a T.B. balance would set your throttle plates even at 4000 rpm or where you choose to do it. Then one bleed screw to get even suck at idle ?
I'd be happy doing that until someone called me a Fook-tard Laughing
Or am I miss reading this , did they move the Sacred screw setting at overhaul ?
For testing / Rigging purposes, Will these engines run at idle with the Stepper motor blanked off ?

Pete ?
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Posts : 127
Join date : 2017-11-09

PostSubject: Re: Throttle rod   Wed Apr 04, 2018 2:52 pm

Part of being an Instrument Tech is understanding how links and levers work.

I would say the length of the rod should be exactly the same as the distance between the butterfly shaft centers, this ensures that both levers operate at the same angle throughout the travel.
The rod length adjustment is commonly known as the Linearity adjustment
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