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-   -   The Quest for more power (http://www.risingsun4x4club.org/forum2/showthread.php?t=16462)

subzali 09-09-2011 08:32 AM

The Quest for more power
 
2 Attachment(s)
No, I'm not putting a V8 in anytime soon :D

But - the PO of my FJ40 always swore up and down that the secondary on the carb never worked. I had a hunch that that was possible, because Martin is able to outrun me on his 34x10.50 LTBs and 4" lift, and my buddy CJ7 Matt can out-pull me on hills on I-70 and he has 3.56 gears in his Jeep.

The carb on my 2F (a '78 carb) has a vacuum-actuated secondary, as opposed to the mechanically actuated secondary on earlier carbs. But before the vacuum can do its part to move the butterfly, the primary has to be open just about 100%, because there is a mechanical stop that has to get out of the way to let the butterfly turn.

I've been doing some tests with a paperclip on the secondary actuator rod and have found that it's not opening. I checked the secondary diaphragm and it's in perfect condition. I replaced it anyway but I'm still not getting the paperclip to slide down the rod, which means the secondary indeed is not opening. As I pondered this last night while I was looking at it, I jammed my accelerator pedal down to the floor and held it there with my star wrench, and went and looked at the linkage on the carb. The lever was just over 50% of its total travel, nowhere near far enough to move the stop so the secondary could open :eek:. I pushed it further with my hand and was able to get it where it needed to be, and then I was able to turn the secondary by hand. Good, the butterfly isn't stuck to the carb. :rolleyes:

I found the culprit (at least I think) to be the bracket that's bolted to the firewall. It's missing some bushings and grommets so the rod is kinda floating in place, which is allowing it to not travel all the way to where it's supposed to. I looked on SOR and the parts I need are: 042-50F, 042-57, and 042-61. 042-50F is discontinued and no longer available, so I'm wondering if anyone could take a picture and/or measurements for me so I can figure out what it is and how I can duplicate it. Thanks! :cheers:

I would like to have more power :thumb:

subzali 09-09-2011 11:09 AM

Well after doing a little MUDsearch I found some pictures of what it's supposed to look like. I think mine is wallowed out to the point where it's going to need some :weld: repair before continuing on...
http://forum.ih8mud.com/attachment.p...1&d=1190248391

http://forum.ih8mud.com/attachment.p...1&d=1182529836

http://forum.ih8mud.com/attachment.p...1&d=1185820413

L43dean 09-09-2011 02:24 PM

mo powah
 
So 042-50f is rubber and 042-57 is a metal bushing? Ace Hdw and Napa have several sizes of rubber grommets. Maybe one will be right. I have also bought metal and nylon bushings at Ace. The Ace around here,Iliff and Chambers, is well stocked. The one at 6th and Peoria is very good and been around a long time, lot's of OLD hard to find stuff. Good luck!!!

RicardoJM 09-09-2011 02:28 PM

It appears there are different part numbers, but might you be able to get the parts from a 60 series in the junk yard?

wesintl 09-09-2011 02:33 PM

I found more power in my 80 recently..

I unhooked the popup :)

subzali 09-09-2011 03:00 PM

Quote:

Originally Posted by RicardoJM (Post 191440)
It appears there are different part numbers, but might you be able to get the parts from a 60 series in the junk yard?

That's actually a really good idea Ricardo, and yes that part is used on the 60 series. Now I just have to figure out when I'll be making a run to the parts yard...

nakman 09-09-2011 03:48 PM

Quote:

Originally Posted by subzali (Post 191392)
...Martin is able to outrun me on his 34x10.50 LTBs and 4" lift...

Dude, Martin's got the fastest stock engine 40 I know of.. he has outrun my 80 going up Floyd Hill.. maybe it's those lightweight body panels? I dunno, I think he just knows how to tune that thing. :bowdown:

subzali 09-09-2011 06:16 PM

Quote:

Originally Posted by RicardoJM (Post 191440)
It appears there are different part numbers, but might you be able to get the parts from a 60 series in the junk yard?

So I learned more about this system today, and it turns out I already have those bushings and pin spacers. I'm only missing the grommet and need to fix my wallered out hole :(

I'm excited to open the possibility of having an operational secondary circuit on my carb though! :D

L43dean 09-10-2011 10:18 AM

more parts may result in more power
 
Hello Matt, Guess what I just found in the parts pile I recently adopted? Thats right, assembly #60 in post number 1. It is the part in the third photo of post number 2, off of Mud I gather. Good day eh?

subzali 09-11-2011 03:53 PM

Dean, if you could save that for me for a few more days I'll pick it up from you after work this week after work


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