318 4 bbl install and linkage questions
Sent a PM your way, Pompis, but I posted this here for anyone interested in doing a 2bbl linkage on a Street Demon.
If you don't get the arm extended 1" up, it will not engage kickdown completely.
What I did, was set the throttle cable out from the bracket about 1 1/2" on a piece of 2" 3/16" flat stock and put the cable hold down hardware out;
If you use your A body cable you will need to set it out and forward to reach and make an L shaped extension or taper it forward (straight flat stock, but longer at an angle- / ) instead of the straight one that comes straight out to the side, like I made. I used a B body cable. The cable will go above the kickdown linkage.
I also made a 1 1/2" flat stock piece with holes 1" away from each other, to bump the kickdown up, on the linkage at the carb, with a 1 1/2" bolt and two nylock nuts to kick the linkage out, so it wouldn't bind on the rest of the linkage below, at higher throttle positions. You can see that in the first pic.
I bent the kickdown linkage arm with more of an elbow, and bent it out, then extended it with a threaded sleeve and bolt that I trimmed the head off of to reach the raised arm.
Demon sells a throttle linkage pin that uses throttle pin for kickdown, while an original will work in the same spot if you just drill the linkage, you will need a shorter arm on the trans to do this, or it will nuke your clutches and steels in the trans from having too low of pressure. kickdown linkage has two functions;
-downshifts
-controls pressure from trans oil pump to clutch engage pistons at all times
When I put the throttle cable and kickdown on the same pin, where Demon suggests, the kickdown only engaged 3/4 on the trans lever.
I would have picked up a Lokar kickdown cable, which has multiple spots on the lever at the transmission and will use the same pin as the throttle cable, or even a shorter lever at the trans, to counteract the short throw on the Demon linkage, but I'm ditching everything in months to come for a stick shift, so it's all going away, so I did this on the cheap. Everything shown clears a stock drop air cleaner with no mods or risers.
Do it however you like, but just remember, it has to engage completely back at the trans, at wide open throttle on the carb for adequate oil pressure at the clutch pistons to hold under the torque input by the engine at different throttle levels.
Hope this helps anyone going after stock 2bbl to 4bbl Street Demon install.
If I had to do it again, if I was going to keep the auto trans, I'd go with a Lokar setup and use a short lever at the trans to eliminate putting the kickdown and throttle on a different axis.
Sent a PM your way, Pompis, but I posted this here for anyone interested in doing a 2bbl linkage on a Street Demon.
If you don't get the arm extended 1" up, it will not engage kickdown completely.
What I did, was set the throttle cable out from the bracket about 1 1/2" on a piece of 2" 3/16" flat stock and put the cable hold down hardware out;
If you use your A body cable you will need to set it out and forward to reach and make an L shaped extension or taper it forward (straight flat stock, but longer at an angle- / ) instead of the straight one that comes straight out to the side, like I made. I used a B body cable. The cable will go above the kickdown linkage.
I also made a 1 1/2" flat stock piece with holes 1" away from each other, to bump the kickdown up, on the linkage at the carb, with a 1 1/2" bolt and two nylock nuts to kick the linkage out, so it wouldn't bind on the rest of the linkage below, at higher throttle positions. You can see that in the first pic.
I bent the kickdown linkage arm with more of an elbow, and bent it out, then extended it with a threaded sleeve and bolt that I trimmed the head off of to reach the raised arm.
Demon sells a throttle linkage pin that uses throttle pin for kickdown, while an original will work in the same spot if you just drill the linkage, you will need a shorter arm on the trans to do this, or it will nuke your clutches and steels in the trans from having too low of pressure. kickdown linkage has two functions;
-downshifts
-controls pressure from trans oil pump to clutch engage pistons at all times
When I put the throttle cable and kickdown on the same pin, where Demon suggests, the kickdown only engaged 3/4 on the trans lever.
I would have picked up a Lokar kickdown cable, which has multiple spots on the lever at the transmission and will use the same pin as the throttle cable, or even a shorter lever at the trans, to counteract the short throw on the Demon linkage, but I'm ditching everything in months to come for a stick shift, so it's all going away, so I did this on the cheap. Everything shown clears a stock drop air cleaner with no mods or risers.
Do it however you like, but just remember, it has to engage completely back at the trans, at wide open throttle on the carb for adequate oil pressure at the clutch pistons to hold under the torque input by the engine at different throttle levels.
Hope this helps anyone going after stock 2bbl to 4bbl Street Demon install.
If I had to do it again, if I was going to keep the auto trans, I'd go with a Lokar setup and use a short lever at the trans to eliminate putting the kickdown and throttle on a different axis.
