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Jetting
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Topic: Jetting (Read 5123 times)
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BillyG
Newbie
Posts: 16
Jetting
«
on:
January 02, 2013, 09:51:01 AM »
What are you guys using on 38's non powerjetted, no air box, for everyday use?? I'm going to finish up #55 for the guy that bought it from me. I remember the needles and nozzles I had in mine, but they were powerjetted.
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Trucker
Full Member
Posts: 171
Re: Jetting
«
Reply #1 on:
January 02, 2013, 06:09:43 PM »
I had 340's in mine with just velocity stacks
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BillyG
Newbie
Posts: 16
Re: Jetting
«
Reply #2 on:
January 07, 2013, 11:46:57 AM »
340's with QO's and 6DH4's or 7's, I had 7's in mine and staggered nozzles
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Trucker
Full Member
Posts: 171
Re: Jetting
«
Reply #3 on:
January 07, 2013, 03:13:09 PM »
i had 6 dh7
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thomy
Jr. Member
Posts: 59
Re: Jetting
«
Reply #4 on:
February 10, 2014, 01:39:29 PM »
Just to confirm for future searchers on this topic:
Temperature approx 15 degrees and clear sky
38 MM VM with no airbox and no velocity stacks
350 main jet
6DH7 clip in forth position from top
247 Q-0 needle jet
17.5 pilot jet (reduced because of the next item)
U.F.O.s -when I put these on I instantly lost my low end bog.
Edit:
mixture screw 1 3/4 turns out
porting: took 1mm off top and sides of exhaust ports, fitted outlets to Aaen Pipes, and polished them.
Now I wonder what it'll do with 40mm carbs.
Thom
«
Last Edit: February 10, 2014, 04:36:06 PM by thomy
»
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Tory944
Hero Member
Posts: 624
Re: Jetting
«
Reply #5 on:
February 10, 2014, 03:03:19 PM »
... just for the record, this is exactly the same calibration I was running on the stock Interceptor @ the 1000ft radar runs. The clip position is the same also... this was before I read your post! Interesting. I will confirm that this was a good set up. Thanks for sharing. You guys might wanna write this down in your notebook.
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Torys Vintage Sleds
Website: torysvintagesleds.com
discus
Guest
Re: Jetting
«
Reply #6 on:
February 12, 2014, 06:16:53 PM »
Are both you guys running UFO's? How do you like them?
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Tory944
Hero Member
Posts: 624
Re: Jetting
«
Reply #7 on:
February 13, 2014, 04:22:16 AM »
They work well as long as your baseline (calibrations) are close. DO NOT do any grinding on the throttle slide - start out with a 3.5 cut out to begin with. The directions tell you that you can "grind" a 2.5 to match the UFO. DON"T DO IT! Very small changes to the slide cut out will throw everything off if both do not match.
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Torys Vintage Sleds
Website: torysvintagesleds.com
thomy
Jr. Member
Posts: 59
Re: Jetting
«
Reply #8 on:
February 13, 2014, 02:40:00 PM »
I had a bog that was hard to shake. When I found a couple of Polaris carbs in my stash with UFOs on the slides I put those slides in the carbs on the Interceptor. You have to dramatically reduce the pilot jet to use the UFO due to the greater suction in the venturi. I heard a dramatic difference as soon as I started the engine and the bog was gone. It pulls hard all the way through the RPM range, which with my setup is 9500 RPM.
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Jetting