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 Post subject: 904 Kickdown Question
PostPosted: Mon Jan 09, 2012 9:32 am 
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TBI Slant 6
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Joined: Sat Jul 22, 2006 12:50 am
Posts: 243
Location: Central Valley, California
Car Model:
The short story : solid throttle linkage ....converted to a 2 barrel.

Before the conversion 1-2 at about 15-20 mph....2-3 around 35-40

Now....1-2 the same but it won't do 2-3 until I am up to 35-40 AND let up on the throttle a bit. I added a tad more length but no change.

Too much initial pressure or too little?

Thanks in advance

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 Post subject:
PostPosted: Mon Jan 09, 2012 10:30 am 
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Joined: Mon Oct 14, 2002 4:32 pm
Posts: 4880
Location: Working in Silicon Valley, USA
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It sounds like the lever ratio(s) have changed and you are getting more TP during the 2-3 shift.
DD


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 Post subject:
PostPosted: Tue Jan 10, 2012 6:11 pm 
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TBI Slant 6
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Joined: Sat Jul 22, 2006 12:50 am
Posts: 243
Location: Central Valley, California
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Thanks Doug.

I've got room for adjustment on both rods.

I also have intact, the stock linkage pieces.

I'll do some measuring on the stock and modified linkage and see if I can get my head wrapped around how to get the ratios back to stock, if not close.

Thanks again.

BTW, I'm really liking that front manifold with the new 2 barrel.

The 170 loves 70 mph now.

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 Post subject:
PostPosted: Tue Jan 10, 2012 10:17 pm 
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Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24803
Location: North America
Car Model:
This what you describe probably cannot be adjusted out -- you will probably need a different throttle lever (the one attached to the kickdown shaft at the trans). There are many different levers with different lengths and different indexing of the "D" shaft hole. I don't know the details of your kickdown linkage after your 2bbl conversion (did you do like here?) so can't comment except to guess.

Even if the present lever will work, you needed to shorten and not lengthen the linkage to try for a satisfactory adjustment.

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 Post subject:
PostPosted: Thu Jan 12, 2012 4:54 pm 
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TBI Slant 6
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Joined: Sat Jul 22, 2006 12:50 am
Posts: 243
Location: Central Valley, California
Car Model:
Thanks Dan

Yes, I used Old6's throttle linkage set up as a model for mine.

My accelerator shaft to bellcrank rod did not need a bend to clear the starter as he shows. It's a straight shot.

(I'm thinking it might be because I used the accelerator pedal to accelerator shaft rod off a 63 dart, which is different than my 61's rod, thus changing the orientation.)

Also, I can't say whether or not my bellcrank is located exactly as his is, but I did mount it on a bracket secured by one of the bell housing bolts as it seems he did.

I do have some adjustment in the acc. shaft to bellcrank rod as I do the bellcrank to tranny rod.

I'll reduce the initial pressure and see where that takes me.

Thanks again

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