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Kirkham Motorsports

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  #101 (permalink)  
Old 11-19-2021, 10:22 AM
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Join Date: Mar 2021
Location: Warren, PA
Cobra Make, Engine: Factory Five MK 4 289 HI Po with Webers
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Thanks Priobe,

I had just about givin up on anyone posting about their jetting recently. I really like the calculator however with my 48 IDA setup on my 289 V8, the answers don't even come close to my settings. Is there another calculator somewhere for 48 IDA carbs on a V8? Seems like not many are interested in this subject on here.

Thanks,

Jim

Last edited by 65arboc; 11-19-2021 at 10:26 AM..
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  #102 (permalink)  
Old 11-21-2021, 07:10 PM
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Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
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Yes, interesting, but 48IDA/IDF would be helpful.
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Paul

Unique Motorcars 289 USRRC
1964 289 5-bolt block
Toploader and 3.31 rear
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  #103 (permalink)  
Old 11-23-2021, 08:41 AM
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Cobra Make, Engine: Factory Five MK 4 289 HI Po with Webers
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Thanks Paul,

Can't seem to get a lot of interest in our WEBERS right now for some reason. Perhaps everyone has their's tuned in perfectly but I doubt it.

Have you got yours up and running yet, Paul?

Thanks,

Jim
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  #104 (permalink)  
Old 11-27-2021, 12:03 AM
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Unhappy Well...

not exactly, Jim. It is a long term project. I will have the Webers in the second incarnation... sourcing parts at this point.
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Unique Motorcars 289 USRRC
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  #105 (permalink)  
Old 11-28-2021, 08:28 AM
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Cobra Make, Engine: ERA FIA 2139, 331 Weber IDF
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44IDF, 331 cu in, 10.7;1 comp, mild 218 deg @.050 cam
135 main
175 air
F11 e tubes
52 idle (homemade)
50 pump jet bypass


These jetting tables of other's engines are interesting, but no way would I base jetting solely off of someone else's.
For instance, and if I use 60 idle jets my engine barely runs (way too rich). If I use 50 idle jets it sneezes. My car is very sensitive to idle jetting, they have most pronounced effect in my case. I have spent $500 on jets and tubes and in the end, ended up with nearly stock jetting for 44IDF.

My engine runs very well 98%. Still have very slight farting at the transition stage during mild accelerations in hot weather.
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  #106 (permalink)  
Old Yesterday, 06:20 PM
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I think guys just want some idea of where to start, not where to set theirs up like the other guy. All applications are different, we should all know that when it comes to Webers. It takes a long time for any of us to get all the settings close so the car runs somewhat well. When I got my 48IDA setup I didn't have a clue except what I had read on the web. Yes I have spent about $150 bucks on jets and and a tuning manual but thru trial and error mine finally runs decent enough to where it is a blast to drive compared to the old Holly setup I had before. My point is, don't be afraid of Webers and just pick a starting point that {compares} to someone elses setup with an engine comparable to yours and get into as many discussions as you can about Webers. Ask questions of experts if possible. I talked to a half dozen experts and some had conflicting answers but all said there is no specific answer to getting Webers running right without experimentation. JMT

Jim
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