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05-04-2017, 06:31 PM | #1 |
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Join Date: Apr 2015
Location: Lehighton, PA
Posts: 84
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Bell Crank for Down Draft
Hi,
Fabricating a throttle linkage for my new Stromberg 81. Wondering if I could get opinions on how this looks? I have been trying to keep the upper and lower linkage to pivot distances equal or if anything the lower leg longer thinking that would give me a longer throw at the pedal. Better control. I still need to add a return spring. Probably from the vacant front threaded spot on the manifold to a point on the bell crank just below the upper linkage connection. Will trim the top off, round the corners when I am happy. Thanks, Jerry |
05-04-2017, 06:46 PM | #2 |
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Join Date: Oct 2011
Posts: 44
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Re: Bell Crank for Down Draft
check out weber kit linkage, you don't need those long arms, I would move the pivot point up ( rods moving horizontal) I build the weber kit. spent a lot of time on the linkage.
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05-04-2017, 07:28 PM | #3 |
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Join Date: May 2010
Location: Windy City
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Re: Bell Crank for Down Draft
As old victoria states, the pivot point is too low. The angularity and length of the lower arm is troubling. Try replacing the bolts that hold the two manifolds together with longer studs. The first nut on the studs will hold the mani's together, then a plate you fab to hold a new pivot point, then two lock nuts to hold the new pivot support plate in place.
Second point- Your idea of a throttle return spring is rather unsafe. You may wish to mount a spring like that to take up the majority of the inertia load of the added linkage, but what happens when that ball cap link pops off the carb throttle shaft! WOT!! You also need a Stromberg ‘Snapback’ throttle return spring, which wraps around the end of the carb throttle shaft. |
05-04-2017, 10:11 PM | #4 |
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Join Date: Apr 2017
Location: Lower Left Coast
Posts: 469
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Re: Bell Crank for Down Draft
Hey, what kind of exhaust manifold is that? That is cheating, the clamp part is not only straight, it has a nipple to slide the exhaust pipe over it so no chance of leak!
I wants one. |
05-04-2017, 10:23 PM | #5 | |
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Join Date: Apr 2015
Location: Lehighton, PA
Posts: 84
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Re: Bell Crank for Down Draft
Quote:
Yeah, I cheat when I can. Last edited by Fillinjc; 05-04-2017 at 10:28 PM. Reason: Clarification |
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05-05-2017, 10:19 AM | #6 |
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Re: Bell Crank for Down Draft
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Dick |
05-05-2017, 10:31 AM | #7 |
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Join Date: May 2010
Location: Reseda, Calif.
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Re: Bell Crank for Down Draft
Jerry, your looks very similar to mine. I bought this from a guy who was running it with this linkage and I just installed it to try it. Not sure if I am fond of the linkage arm yet and I might change it when I get a chance. Return spring picture also. I tried to gravity feed and would idle nice but not under power. 6 volt pump installed. Good luck with yours. Mark.
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05-05-2017, 10:32 AM | #8 | |
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Join Date: Apr 2015
Location: Lehighton, PA
Posts: 84
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Re: Bell Crank for Down Draft
Quote:
Thanks, Jerry |
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05-05-2017, 10:43 AM | #9 | |
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Join Date: Apr 2015
Location: Lehighton, PA
Posts: 84
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Re: Bell Crank for Down Draft
Quote:
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05-05-2017, 04:37 PM | #10 |
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Join Date: May 2010
Location: Illinois
Posts: 2,181
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Re: Bell Crank for Down Draft
Here is mine.
You need a straight pull on the carb. An angle will make last part of travel hard. John Last edited by john in illinois; 05-05-2017 at 04:43 PM. |
05-05-2017, 04:57 PM | #11 |
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Location: IL
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Re: Bell Crank for Down Draft
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05-14-2017, 09:39 AM | #12 |
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Join Date: Apr 2015
Location: Lehighton, PA
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Re: Bell Crank for Down Draft
Thanks for the feedback.
Revision 2: |
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