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Unread 07-22-2012, 08:41 PM   #466
mulliflier
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Ah, gotcha, no Sean sorry I have been so busy lately that I haven't been keeping up on my JF. Last few months have been really something, just getting caught up now. Matt, thanks for the help, my issue with the idles though is that 45, to my knowledge, is the smallest jet for the 38 (according to Redline anyway). I was originally headed that direction, but Ron told me that there is nothing smaller than a 45, and that regardless, opening up the air correctors is what he recommended. I went with that, since he's the redline bubba and invariably knows more about carbs than I do. I get the jets by mail tomorrow, I'll let you know how it goes. If anyone knows how to obtain a set of idles/mains smaller than 45/145, let me know.

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Unread 07-22-2012, 09:17 PM   #467
Matt1981CJ7
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Quote:
Originally Posted by mulliflier View Post
Ah, gotcha, no Sean sorry I have been so busy lately that I haven't been keeping up on my JF. Last few months have been really something, just getting caught up now. Matt, thanks for the help, my issue with the idles though is that 45, to my knowledge, is the smallest jet for the 38 (according to Redline anyway). I was originally headed that direction, but Ron told me that there is nothing smaller than a 45, and that regardless, opening up the air correctors is what he recommended. I went with that, since he's the redline bubba and invariably knows more about carbs than I do. I get the jets by mail tomorrow, I'll let you know how it goes. If anyone knows how to obtain a set of idles/mains smaller than 45/145, let me know.
Hmm....I'm not sure what Ron is talking about. The jetting combo that worked best for me, at 6000', was 50 idles, 135 mains, F7/170 air correctors. I wish I had a set of 45 idles to try, I think they'd be even better.

Ask for Tom at Redline.

Matt
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Unread 07-23-2012, 09:12 AM   #468
John Strenk
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Sweet, all you need is an ash bowl and ... nah, better not go there,

You need to machine a carb out of a clear block of plexiglass someday.
Hmmm.....

I had this big clear box and a couple of shop vacs and a carb....
If I only had a Bridgeport..
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Unread 07-23-2012, 11:34 AM   #469
swatson454
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Thanks, John

I need to find the right fluid. Water just has too much surface tension and I don't think that sucking flammable rubbing alcohol through a shop-vac is my most smarterest idea to date. I'd also like to line up a high-def video camera and hopefully get some still shots of it in action. The camera phone thing didn't quite cut the mustard.

Any thoughts on a test fluid?


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Unread 07-23-2012, 01:38 PM   #470
86cj74.2L
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The diesel fuel injection test stands I repair use a calibration fluid with same specific gravity and properties as diesel.

Got to be something for gas. Unless thats what they use.

I thought I saw a animation video on it on how stuff works.

It injects air into the stream of fuel going to metering ports.......makes it frothy.
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Unread 07-23-2012, 02:15 PM   #471
uptillnow
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Originally Posted by 86cj74.2L View Post
The diesel fuel injection test stands I repair use a calibration fluid with same specific gravity and properties as diesel.

Got to be something for gas. Unless thats what they use.

I thought I saw a animation video on it on how stuff works.

It injects air into the stream of fuel going to metering ports.......makes it frothy.
I have heard that "Stoddard" solvent has been used for testing inplace of gasoline, close equivalent.
UPTILLNOW


Frothy
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Unread 07-23-2012, 02:23 PM   #472
86cj74.2L
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Originally Posted by uptillnow

I have heard that "Stoddard" solvent has been used for testing inplace of gasoline, close equivalent.
UPTILLNOW


Frothy
All that is is mineral spirits. And easy to find.
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Unread 07-23-2012, 08:47 PM   #473
John Strenk
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And there are many other ways to create a vacuum without a shop vac.
We use a vacuum run off compressed air.
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Unread 07-23-2012, 09:27 PM   #474
86cj74.2L
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Originally Posted by John Strenk View Post
And there are many other ways to create a vacuum without a shop vac.
We use a vacuum run off compressed air.
Do you have the cabinet coolers that use compressed air too? Cabinet Cooler is the brand I think.
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Unread 07-28-2012, 05:34 PM   #475
svenster
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so i am now noticing a grip of predetonation(ticktacks-clickclacks) since adjusting my carb and timing. oh, and my choke does not seem to be working anymore. any ideas from the gurus?
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Unread 08-02-2012, 06:57 PM   #476
svenster
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anybody?
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Unread 08-04-2012, 01:44 PM   #477
mulliflier
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If you're getting predetonation, I would either double-check your timing and possibly retard it some, check that you don't have some bad fuel, or something along that line. Assuming all else is well, the timing would be my immediate culprit - retarding it even a few degrees might get rid of the pre-det.

Hope that helps a little man, I'm no guru but the real pros seem to be busy.
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Unread 08-05-2012, 04:36 PM   #478
svenster
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ok. timing between 8*-10*, it bounces a little. zero vacuum at ported. idles waaaaay low, around 380. if i turn in the speed screw i lose my zero vacuum. mixture screw at 1 turn out. less pre-det btw though, so that is good... any more help would be greatly appreciated.
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Unread 08-05-2012, 04:37 PM   #479
svenster
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need to figure out how to increase my idle without losing zero vacuum.
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Unread 08-05-2012, 09:46 PM   #480
mulliflier
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Use zero vac when finding lean-best if you can, but once that is set, you want to reconnect your vac advance and then set your idle to 600-700. At that point, it doesn't matter so much if there is absolutely zero vac, you might have a few in of Hg of vac but shouldn't be much (like 3in or so I would say is fine.)
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