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01-12-2015, 08:36 PM | #1 |
Junior Member
Join Date: Jun 2011
Location: Melbourne australia
Posts: 9
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Flathead running rich
Hi all hope someone may have some ideas on what could be going on with my engine. I have an 8ba 3 5/16"bore 4 1/8" stroke potvin moon cam Jahns solid skirt Pistons it's been ported polished running Malory twin point ignition champion 10hc plugs brand new stromberg 97's with 45 main jets 65 power valve. And edelbrock super duel intake. But it seems to rune rich could the jets be to big???? I can't seem to get much response out of the mixture screws the engine will run with screws out of one carb but not both. Is it hard to set mixture with a big cam???? And input would be great thank you Jason . Also I have been over the whole engine numerous time looking for vacuum leaks can't find any.
Last edited by camswax; 01-12-2015 at 09:13 PM. |
01-12-2015, 09:14 PM | #2 |
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Join Date: Oct 2011
Location: Shelton, WA
Posts: 3,811
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Re: Flathead running rich
Carb where you can remove the idle screws has a problem. While you are fixing things, reduce all the jets to 44s. Set idle screws to 1 and 1/4 turns out to start with.
I have an Edelbrock Super dual with 97s and use 44s. Good luck |
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01-13-2015, 11:47 AM | #3 |
Member Emeritus
Join Date: May 2010
Location: Madison, NJ
Posts: 5,230
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Re: Flathead running rich
If you are running little chrome air cleaners, give the thing a quick test run without them and see what happens.
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01-13-2015, 12:02 PM | #4 |
BANNED
Join Date: May 2010
Posts: 3,019
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Re: Flathead running rich
cams,
X100 what Bruce says. K & N makes the only element that won't choke your motor IF you are using the little chrome air cleaners. On rare occasions the power valves have been known to leak....I emphasize rare occasions. Charlie ny |
01-13-2015, 05:17 PM | #5 |
Senior Member
Join Date: May 2010
Posts: 4,786
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Re: Flathead running rich
The 45-65 is the standard set up for ONE 97. Adding additional carbs. your going to have to cut down the fuel. I run .043 & 69 my cam is much milder than yours and the engine is 3.062 with a stock crank. 44 sound as a good starting place and maybe 68 With the dual set up engine vacuum will be lower and then adding a tall cam should make it a bit less also.
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01-13-2015, 07:28 PM | #6 |
Junior Member
Join Date: Jun 2011
Location: Melbourne australia
Posts: 9
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Re: Flathead running rich
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01-13-2015, 07:44 PM | #7 |
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Join Date: May 2010
Location: SLC Utah
Posts: 799
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Re: Flathead running rich
Strombergs do their best when gathering air from a non-turbulent, unrestricted, dead-air space. Be sure your scoops are facing towards the rear.
This also helps prevent siphoning fuel at speeds over 150 mph!
__________________
RIP Tyler... My Son, Helper & Best Friend. Feb '78 to Father's Day '10. www.97-express.com ~ [email protected] Last edited by uncle max; 01-13-2015 at 07:55 PM. |
01-13-2015, 09:14 PM | #8 |
Senior Member
Join Date: May 2010
Location: Alameda, California
Posts: 335
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Re: Flathead running rich
Thanks Uncle Max......my carbs seem to foul up at speeds just over 145MPH, I am going to reverse the scoops and report back to you!...Matt in Alameda
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01-13-2015, 09:33 PM | #9 |
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Join Date: May 2010
Location: SLC Utah
Posts: 799
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Re: Flathead running rich
I'm here to help...
Saving lives and promoting smiles, one carb at a time.
__________________
RIP Tyler... My Son, Helper & Best Friend. Feb '78 to Father's Day '10. www.97-express.com ~ [email protected] |
01-14-2015, 12:15 AM | #10 |
Junior Member
Join Date: Jun 2011
Location: Melbourne australia
Posts: 9
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Re: Flathead running rich
Thanks uncle max what do you think about the # 45 main jets im running in my engine? To big I think I will try some #42 thanks again for the tip on the air cleaners.
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01-15-2015, 09:55 AM | #11 |
Member Emeritus
Join Date: May 2010
Location: Madison, NJ
Posts: 5,230
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Re: Flathead running rich
Take off whatever is on top of carbs for a test..easy and quick. All matter of shiny stuff up there needs evaluation.
Slightly smaller jets may well be indicated, but I doubt stockish jetting is far enough off to be an in your face problem... Remember that retarded ignition/slow or inadequate advance can mimic some symptoms of richness, including loading the plugs worry about bowl vent, especially front one...fan is probably right there...fan blast could slightly pressurize bowl, effectively increasing pressure drop in venturi...build a little windshield for that, like the ones used on some gas fired heater setups so it is shielded a bit. |
01-16-2015, 04:03 PM | #12 |
Junior Member
Join Date: Jun 2011
Location: Melbourne australia
Posts: 9
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Re: Flathead running rich
It seems to be better the last few days a little bit of black smoke. My fuel pressure was at 3 I turned it back down to 2.5 thanks for all you r help. I have really enjoyed the comments thanks again.
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