scudderfish
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| posted on 12/2/11 at 02:43 PM |
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Sticky throttle
I use one of these
 as the throttle body on my RV8. More pics of it here
https://picasaweb.google.com/dave.g.smith/4BarrelThrottleBody#, here https://picasaweb.google.com/dave.g.smith/FuelInjectors# and here
https://picasaweb.google.com/dave.g.smith/ManifoldSwap#
My problem is that it is reluctant to completely close. The car will be idling circa 900rpm, I'll poke the accelerator, and it will drop back
to 2000rpm. I can push it closed fully by pushing on the lever arm. It isn't the cable binding as I've set it up with a bit of slack in
it. The required arm travel to correctly close it is <1mm. It feels smooth to operate by hand. I tried lubricating the butterfly pivots (WD40, 3
in 1 etc), but that seems to get washed away by the petrol as at idle the injectors fire onto the closed face of the butterflies.
Any ideas? It makes it quite nasty to drive at the moment.
Regards,
Dave
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Snuggs
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| posted on 12/2/11 at 03:05 PM |
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Stronger throttle return spring required.
----------------------------------------------------------------------------------------------------
http://www.topcashback.co.uk/ref/snuggstcb
Spider pig, spider pig, does whatever a spider pig does.
I doubt therefore I may be.
Luposlipophobia : Fear of being chased by wolves around a freshly waxed kitchen floor, while wearing only socks on your feet.
My mind not only wanders, sometimes it leaves completely!
http://www.venganza.org
http://www.jesusandmo.net/
http://www.snuggs.co.uk
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Canada EH!
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| posted on 12/2/11 at 04:51 PM |
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Second the throttle spring, looks like a modified Holley carb, most cars over here have two throttle return springs (Muscle cars).
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scudderfish
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| posted on 12/2/11 at 05:29 PM |
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It does already have two springs, one on each side 
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britishtrident
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| posted on 12/2/11 at 05:47 PM |
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h
Have you tried recentering the butteflys on the spindles.
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RAYLEE29
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| posted on 12/2/11 at 06:56 PM |
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+1 for adjusting the flaps so to speak, also check the linkage isnt binding, try taking it off and seeing if it returns home without it.
you may need to bend the linkage slightly to allow both throttles to close fully
Ray
[Edited on 12/2/11 by RAYLEE29]
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scudderfish
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| posted on 12/2/11 at 07:01 PM |
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Thanks all. The springs are tensioned by twisting them rather than stretching, so I've preloaded one of them with an extra twist. See how it
goes tomorrow. I've tried getting the flaps off before, but the are held on with slotted screws and I was beginning to strip the head without
them shifting. I think there is some serious threadlock in there.
Regards,
Dave
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RAYLEE29
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| posted on 12/2/11 at 07:05 PM |
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just seen pic of the install check the throttle pot isnt holding it off
Ray
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MakeEverything
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| posted on 12/2/11 at 08:20 PM |
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Try squirting the mechanism and butterflies with a little WD40, then exercising them.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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scudderfish
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| posted on 12/2/11 at 09:22 PM |
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quote:
Originally posted by MakeEverything
Try squirting the mechanism and butterflies with a little WD40, then exercising them.
I tried lubrication and manipulation but it provided no lasting satisfaction.
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Jon Ison
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| posted on 12/2/11 at 11:01 PM |
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I know you say the cable is free but do you have a return spring on the pedal or are the carb springs doing all the work ?
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MakeEverything
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| posted on 12/2/11 at 11:05 PM |
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quote:
Originally posted by scudderfish
quote:
Originally posted by MakeEverything
Try squirting the mechanism and butterflies with a little WD40, then exercising them.
I tried lubrication and manipulation but it provided no lasting satisfaction.
lol
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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westy turbo
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| posted on 13/2/11 at 09:04 AM |
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u can actually find springs the same length,but harder,or if you cant find harder ones,double them,
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