Racing Fuel Systems

Re: Tuner's Secondary Lever Mods

2023-04-18T11:53:07+01:00

Hopefully you will be able to test the carb and let us know if throttle feel is different.

Statistics: Posted by rgalajda — Tue Apr 18, 2023 11:53 am

Re: Tuner's Secondary Lever Mods

2023-04-10T00:07:34+01:00

…finally adding the pivot pin…works excellent…it’s now opening the secondary with the 9/32” opening on the primary ,, very nice improvement.

Statistics: Posted by 10132 — Mon Apr 10, 2023 12:07 am

Re: Tuner's Secondary Lever Mods

2023-03-15T14:06:09+01:00

…I played around with a late 70s truck style baseplate yesterday, which didn’t start to open the secondary till about 15/32”(using a typical carb rebuild “L” ruler as a gauge).. this baseplate has the very long late delayed primary pivot arm, so as others have mentioned, I drilled another hole to replicate the passenger version …I than reassembled the linkages and everything needed retweaking….I did the A-B-C synchronization, now it opens the secondary at 11/32”…very nice improvement…I still need to add the relocated pivot “pin” mod…I’m post some pixs when I figure out how to resize to format here.

Statistics: Posted by 10132 — Wed Mar 15, 2023 2:06 pm

Re: Tuner's Secondary Lever Mods

2023-03-05T13:38:15+01:00

Edit…not 70-74 Buicks, but yes with Cadillac, Olds, and Pontiac. LOL.
I have never noticed the longer slot (C) in those levers and I have built plenty of them. LOL.
Thanks again.

Statistics: Posted by 10132 — Sun Mar 05, 2023 1:38 pm

Re: Tuner's Secondary Lever Mods

2023-03-04T18:40:06+01:00

The order of contact is A then B and C last. Three points of contact ,one after the other. Notice the longer curved slot at "C" on this type of linkage . See Photo below.

Statistics: Posted by rgalajda — Sat Mar 04, 2023 6:40 pm

Re: Tuner's Secondary Lever Mods

2023-03-04T16:42:21+01:00

…that is a very nice looking overhaul.
…thanks for clarity Tuner’s info, it looks just like the 70-74 Olds, Buick and Cadillac rear linkage.
I’ll pull one off the shelf to visualize the movement.

Statistics: Posted by 10132 — Sat Mar 04, 2023 4:42 pm

Re: Tuner's Secondary Lever Mods

2023-03-04T12:30:55+01:00

Statistics: Posted by rgalajda — Sat Mar 04, 2023 12:30 pm

Re: Tuner's Secondary Lever Mods

2023-03-03T13:40:06+01:00

Statistics: Posted by 10132 — Fri Mar 03, 2023 1:40 pm

Re: Tuner's Secondary Lever Mods

2023-01-30T13:42:08+01:00

Statistics: Posted by rgalajda — Mon Jan 30, 2023 1:42 pm

Re: Tuner's Secondary Lever Mods

2023-01-29T20:13:12+01:00

Statistics: Posted by Papastoy72 — Sun Jan 29, 2023 8:13 pm

Re: Tuner's Secondary Lever Mods

2023-01-29T18:33:12+01:00

Statistics: Posted by rgalajda — Sun Jan 29, 2023 6:33 pm

Re: Tuner's Secondary Lever Mods

2023-01-29T05:30:44+01:00

Chrysler tuning tips for WOT position of the TQ sec throttle blades. Blades hanging out below base plate should point IN, towards carb centre. For single plane intake, should be 88* angle; for dual plane, 81*. I suspect this has more to do with air flow distribution, not fuel flow. Probably worth trying on a QJ.

Statistics: Posted by GTO Geoff — Sun Jan 29, 2023 5:30 am

Re: Tuner's Secondary Lever Mods

2023-01-28T19:33:12+01:00

This is how I use the pliers. Do small increments at a time.

Statistics: Posted by rgalajda — Sat Jan 28, 2023 7:33 pm

Re: Tuner's Secondary Lever Mods

2023-01-28T19:08:44+01:00

The secondary throttle plates should not over centre at WOT. Actually they should be a little less than 90 degrees to full open , or you could upset flow pattern.
You can bend the pin on the throttle shaft to meet the stop, as in this picture.

Statistics: Posted by rgalajda — Sat Jan 28, 2023 7:08 pm

Re: Tuner's Secondary Lever Mods

2023-01-28T19:02:00+01:00

This is how I measure the initial contact of the secondary opening. Then you you can compare after adjustment and/or modification.
I also take measurements with .400" and .500" primary opening to see secondary opening dimension.

Statistics: Posted by rgalajda — Sat Jan 28, 2023 7:02 pm