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28 PCI Carb with Judson
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Schnage
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PostPosted: Wed Apr 13, 2016 12:47 pm    Post subject: 28 PCI Carb with Judson Reply with quote

What nozzel size do you use in your carb with judson?

I think i have to test some other sizes?
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Schnage
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PostPosted: Fri Apr 22, 2016 11:14 pm    Post subject: Re: 28 PCI Carb with Judson Reply with quote

Schnage wrote:
What nozzel size do you use in your carb with judson?

I think i have to test some other sizes?



No one no idea?

Hmm, so try and error maybe a choice....Wink
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John Moxon Premium Member
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PostPosted: Sat Apr 23, 2016 12:01 am    Post subject: Re: 28 PCI Carb with Judson Reply with quote

If you mean jet sizes, Judson suggested 122.5 mains and 140 air correction but nowadays most go with a 130 main with the 140 air correction.
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Schnage
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PostPosted: Sat Apr 23, 2016 2:13 pm    Post subject: Re: 28 PCI Carb with Judson Reply with quote

Thx John, i will try, i have orderd some jets to try some different cominations...
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Schnage
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PostPosted: Sat Jun 18, 2016 6:54 am    Post subject: Re: 28 PCI Carb with Judson Reply with quote

So now i try a 130 main, and a 135 air correction jet, maybe it runs better....but the trouble with starting hot will this setup not fix i think.....
I am waiting for the pertronix maybe that will help al little bit...

Markus
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Schnage
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PostPosted: Sat Jun 18, 2016 6:57 am    Post subject: Re: 28 PCI Carb with Judson Reply with quote

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Schnage
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PostPosted: Thu Jun 23, 2016 10:05 am    Post subject: Re: 28 PCI Carb with Judson Reply with quote

Always the same, 20 kilometer autobahn, and engine wont go further, when i stopped the engine starts first after 1 hour........
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Schnage
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PostPosted: Sun Jun 26, 2016 1:54 am    Post subject: Re: 28 PCI Carb with Judson Reply with quote

Would maybe a spacer under the carb helps? I thinking abaut a electric fan to blow fresh air to the judson and the carb .... Dont know.... Sad
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busbusbus
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PostPosted: Wed Jul 20, 2016 11:38 pm    Post subject: Re: 28 PCI Carb with Judson Reply with quote

is there a good spark?
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Schnage
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PostPosted: Mon Aug 15, 2016 4:13 am    Post subject: Re: 28 PCI Carb with Judson Reply with quote

Today i removed the Judson Magneto and use a Flamethrower, it runs better, but when hot it wont start as before. Sometimes when run on autobahn it want take gas and wont idle up. There are some "explosions" from exhaust....
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Starbucket
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PostPosted: Wed Aug 31, 2016 2:20 pm    Post subject: Re: 28 PCI Carb with Judson Reply with quote

Pull some plugs and see if they are white (bad = very lean) or worse covered with tiny specs of aluminum (very bad, that's bits of molten Aluminum = detonation from too much advance and too lean a mix trying to burn a hole in the pistons). The only way to tune a super charged motor without a dyno is to mount a pyrometer probe near the exhaust port and adjust till exhaust doesn't exceed 900 F under WOT. Aluminum starts going away at 1300 F.
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Schnage
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PostPosted: Sun Sep 04, 2016 12:48 pm    Post subject: Re: 28 PCI Carb with Judson Reply with quote

It was a problem wit the ignition, the cap from distributor was worn, curious that i didn't seen it before..... I installed a pertronix ignitor, a new coil, cap and rotor, now i have no problem....

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Look at the thin black line....there goes the power that is missing on the plug...
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Telephunken
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PostPosted: Sun Sep 25, 2016 4:58 pm    Post subject: Re: 28 PCI Carb with Judson Reply with quote

I was having a similar issue when I upgraded my carb from the 28PCI to a 32PCI. This was recommended to me to let the supercharger "breathe" better. Im running a Speedwell Pepco SC. It was popping and flaming out the carb, and ran like crap. was running way too lean. I had to switch up the jets, the air correction most importantly. I think its a 140 now. Then I upgraded my pilot to a 55 from a 40 which really helped on the bottom end RPM's, then last using a 125 Main jet. Now after a couple weeks of good running now im dealing with a new issue. loss of fuel pressure I think.... UGH
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Terry Gaudet Premium Member
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PostPosted: Thu Mar 07, 2019 1:55 pm    Post subject: Re: 28 PCI Carb with Judson Reply with quote

Quick question. Do most of you keep the manual choke hooked up with a Judson install or is there too much in the way to make it work?
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