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08-04-2010, 11:17 PM | #1 |
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dual carbs what jets you using here in cali
Hey everone, I am now starting to try and get better gas mileage, Im running 2 97s on a Fenton intake, warmed 49-53 flatie, 4"merc crank.
havent pulled a carb to see what is in them now, but what are you running with dual carbs here in sunny california. rich |
08-05-2010, 12:28 AM | #2 |
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Re: dual carbs what jets you using here in cali
42 or 43 mains
69 acc. valve |
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08-05-2010, 12:43 AM | #3 |
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Re: dual carbs what jets you using here in cali
Hot rod mickey's got it pretty good,i would suggest the same. ken ct.
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08-05-2010, 01:56 AM | #4 | |
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Re: dual carbs what jets you using here in cali
Quote:
I'am using .046 jets and 65 power valeves, and get 14 miles to the gallon. I have tried .042 to .048 jets, and got the best power, and good all around driveabilty with the 46's. This is with an .040 bore, four inch stroke, and Weber F4 cam, in an 1800 lb Roadster.....Ed |
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08-05-2010, 07:09 PM | #5 |
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Re: dual carbs what jets you using here in cali
thanks guys, i will pull one off this weekend and see whats inside, as i am only getting 11 miles to the gallon, and have been told 14 and 15 miles was bad, but have not been told what jets and main or power valve is being used to accomplish this, i have also read on the HAMB of flatheads hitting 18 miles to the gallon.
rich |
08-05-2010, 07:28 PM | #6 |
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Re: dual carbs what jets you using here in cali
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RIP Tyler... My Son, Helper & Best Friend. Feb '78 to Father's Day '10. www.97-express.com ~ [email protected] |
08-05-2010, 07:46 PM | #7 |
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Re: dual carbs what jets you using here in cali
Are you running rich Rich?
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08-05-2010, 08:49 PM | #8 |
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Re: dual carbs what jets you using here in cali
i have 2 more 97s in the reading room, with #42 jets, i just looked, but did not take the top off to see the power valve.
i smell a little gas but not a lot that would say hay i smell gas. the tops weep a little compared to how wet they were before i put a fuel regulator on. im loving that 22 miles i keep hearing about. rich Last edited by 34flathead; 08-05-2010 at 08:50 PM. Reason: add the last sentance |
08-06-2010, 07:47 AM | #9 |
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Re: dual carbs what jets you using here in cali
'34,
Do not overlook the possibility that your existing power valves may be leaking. Many new out of the box PV's and certainly many used PV's leak. Max and I have simple but effective devices to check for this situation. Charlie ny |
08-06-2010, 07:52 AM | #10 |
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Re: dual carbs what jets you using here in cali
'34,
Stromberg power valves new and used have a tendency to leak. Max and I have simple but effective devices to check for leaky PV's. Charlie ny |
08-07-2010, 05:47 PM | #11 |
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Re: dual carbs what jets you using here in cali
ok, so i took the carbs off and opened them up, jets are #45 and the power jet is # 65, the other set of carbs have #43 jets and #69 power jet.
i will use the second pair's base gasket on the bases that i am leaving on because i dont want to mess with the linkage that connects the bases together. question, do you just put the top back on the carb or do you put oil on the accelorator pump leather? rich Last edited by 34flathead; 08-07-2010 at 05:48 PM. Reason: to add a word |
08-08-2010, 05:41 AM | #12 |
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Re: dual carbs what jets you using here in cali
'34,
OK the jets are stamped with some number and so are the power valves....did you determine that the jets have not been opened up....very common......and that the power valves don't leak. Not much sense in going further until you know the jets and power valves are good. Don't forget to pull the emusion tubes to be sure they aren't plugged. Charlie ny |
08-08-2010, 07:01 AM | #13 |
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Re: dual carbs what jets you using here in cali
I oil the leather.
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08-08-2010, 03:42 PM | #14 |
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Re: dual carbs what jets you using here in cali
charlie ny, i have the carbs off now, how do i test to determine if the power valve is leaking or not?
i have seen on here and will check the search thread to get the size of drill bit to verify the # on the jet, these were built back in 04 for me, and the set i put on i purchased when the guy decided to chevy his '40 coupe were built by the same guy. the second set are on and the flatie now, smokes at idle, i do not know how to adjust the air fuel mix screws. rich Last edited by 34flathead; 08-08-2010 at 03:54 PM. Reason: ass sentence |
08-08-2010, 05:23 PM | #15 |
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Re: dual carbs what jets you using here in cali
There is no drill # that you could use. You need a pin gauge set which has presision short rods in .001 incretments to measure them. ken ct.
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08-08-2010, 05:43 PM | #16 |
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Re: dual carbs what jets you using here in cali
i just finished searching the search thread and my best friend google, it will need to be a pin set to verify the size.
now i am going to see what i can find online for these. also the #45 jet that came out of the carbs i took off, the hole at the top and bottom dont matter, just the hole in the middle right? rich |
08-08-2010, 07:48 PM | #17 |
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Re: dual carbs what jets you using here in cali
'34,
Check your emails. Charlie ny |
08-08-2010, 08:06 PM | #18 |
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Re: dual carbs what jets you using here in cali
If you can wait till after Bonneville, send me your carbs and I'll go through them.
I'm in a good mood - no charge.
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RIP Tyler... My Son, Helper & Best Friend. Feb '78 to Father's Day '10. www.97-express.com ~ [email protected] |
08-08-2010, 08:47 PM | #19 |
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Re: dual carbs what jets you using here in cali
i tried to email Chris some pic's but they were too many and it locked up my outlook email, my pm should be working, unless that has stopped too.
that would be just great uncle max. rich |
08-09-2010, 05:59 AM | #20 | |
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Re: dual carbs what jets you using here in cali
Quote:
I think Vern Tardel has one in his `32 roadster if i remember correct... I bet it sounds great!!! |
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