Re: AFR spikes lean rolling to a stop ?
[Re: carnut68]
#3110667
01/10/23 08:03 PM
01/10/23 08:03 PM
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Posts: 179 California, U.S.A.
Torquemonster440
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How about timing? Maybe more advance? When checked with a timing light ,I'm all in at 38° at 2,000 rpm. Msd Pro billet dist mech advance only...no vac advance, Msd Digital box. But what is the timing at idle, you should be in the 20 to 25 deg , & about 10 to 15 deg of mechanical advance He'll never get that with MSD bushings. 18 degree is the smallest. So he's probably @20 initial. I had to get bushings from FBO, they are 10 and 14. I think he needs to find out whether his IFR is in the high or low position. Run a hose between the vent tubes with a hole on top in case fuel is coming out on a hard stop spilling into carb. I'm at about 20-22° at idle. 37-39° at 2k rpm. Ifr's are in the high position. Upper corners of the metering blocks. The condition will occur even coming to a stop rather gradually. I run a reverse manual valve body.. if I'm in high gear approaching a stop and down shift to second just before it trys to stumble, the rpm increse will mitigate the stumble if I slow down gradually enough. The gauge will still flutter towards 15-16.. but the car won't stall.
Last edited by Torquemonster440; 01/11/23 10:08 AM.
1966 Satellie.. 12.55 @107.75. 906 heads. 3780 lbs.
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Re: AFR spikes lean rolling to a stop ?
[Re: Torquemonster440]
#3110707
01/10/23 11:00 PM
01/10/23 11:00 PM
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Joined: Jun 2014
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carnut68
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You need to move them [IFR] down to keep them covered in fuel. They may need to fattened up a bit especially with e85.
Last edited by carnut68; 01/10/23 11:01 PM.
America First!
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Re: AFR spikes lean rolling to a stop ?
[Re: carnut68]
#3110770
01/11/23 10:06 AM
01/11/23 10:06 AM
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Joined: May 2014
Posts: 179 California, U.S.A.
Torquemonster440
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You need to move them [IFR] down to keep them covered in fuel. They may need to fattened up a bit especially with e85. I've fattened them up to the largest IFR's I could find. It's a purpose built E85 carb, it came with size 46 IFR's factory. I now have size 59's installed which are the largest available in the kit I bought. Is there a brand of metering block you know of that has the IFR location located at the bottom ?
Last edited by Torquemonster440; 01/11/23 10:24 AM.
1966 Satellie.. 12.55 @107.75. 906 heads. 3780 lbs.
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Re: AFR spikes lean rolling to a stop ?
[Re: Torquemonster440]
#3110772
01/11/23 10:13 AM
01/11/23 10:13 AM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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You need to move them [IFR] down to keep them covered in fuel. They may need to fattened up a bit especially with e85. I've fattened them up to the largest IFR's I could find. It's a purpose built E85 carb, it came with size 46 IFR's factory. I now have size 59's installed which are the largest available in the kit I bought. Is there a brand of metering block you know of that has the IFR location located kin the bottom ? You don’t need new metering blocks. Drill and tap the lower position and use brass set screws from McMaster-Carr or similar and drill your own jets.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: AFR spikes lean rolling to a stop ?
[Re: madscientist]
#3110970
01/11/23 09:07 PM
01/11/23 09:07 PM
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Joined: Jun 2014
Posts: 3,245 Md.
carnut68
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You need to move them [IFR] down to keep them covered in fuel. They may need to fattened up a bit especially with e85. I've fattened them up to the largest IFR's I could find. It's a purpose built E85 carb, it came with size 46 IFR's factory. I now have size 59's installed which are the largest available in the kit I bought. Is there a brand of metering block you know of that has the IFR location located kin the bottom ? You don’t need new metering blocks. Drill and tap the lower position and use brass set screws from McMaster-Carr or similar and drill your own jets. Yep it's easy lots of videos out there. The screws are 6/32. Drill slow with some oil.
America First!
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Re: AFR spikes lean rolling to a stop ?
[Re: carnut68]
#3111023
01/11/23 11:08 PM
01/11/23 11:08 PM
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Joined: Aug 2003
Posts: 43,285 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,285
Bend,OR USA
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You need to move them [IFR] down to keep them covered in fuel. They may need to fattened up a bit especially with e85. I've fattened them up to the largest IFR's I could find. It's a purpose built E85 carb, it came with size 46 IFR's factory. I now have size 59's installed which are the largest available in the kit I bought. Is there a brand of metering block you know of that has the IFR location located kin the bottom ? You don’t need new metering blocks. Drill and tap the lower position and use brass set screws from McMaster-Carr or similar and drill your own jets. Yep it's easy lots of videos out there. The screws are 6/32. Drill slow with some oil. I use a pin vice to drill my brass set screws, #6, #8, #10 or larger No oil though, just hand pressure pressing and slow hand rotation speeds
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: AFR spikes lean rolling to a stop ?
[Re: Torquemonster440]
#3111242
01/12/23 03:48 PM
01/12/23 03:48 PM
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Joined: Sep 2003
Posts: 19,589 north of coder
moparx
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,589
north of coder
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a word of caution when drilling brass set screws, or enlarging holes that are already there. this applies to all methods, drill motor, drill press, or hand operated pin vise. watch the "break through" at the end of the hole. this is where the majority of broken drills happen, because the flutes of the drills stick on the last couple of fines. this happens whether using lube or not, and is just the nature of the material. it is also a good idea to replace the bit size often, so you have a sharp cutting edge. most think brass is a soft material [and it relatively is], however, it is abrasive, and requires the sharpest tools you can use to successfully cut, machine, or drill it. just speaking from a 45+yr working career as a machinist, [and still practicing] with lots of scrapped brass and tooling under my belt.
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Re: AFR spikes lean rolling to a stop ?
[Re: ademon]
#3115285
01/21/23 10:46 PM
01/21/23 10:46 PM
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Joined: May 2014
Posts: 179 California, U.S.A.
Torquemonster440
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Welp, after screwing with this carb for months dealing with this condition, I've just decided to cut my losses. Switch back to gas and put my trusty Holley 9380 850 double Pumper back on. I tested it today.No more stumble while rolling to a stop !! HALLELUJAH!! .. Perhaps relocating the IFR's down low would have fixed it?.. but still , I didnt wanna go drilling away on the carb based on what is still just a guess in my opinion. Wanted to say thanks to anyone who gave feed back or offered input. I'm gonna sell the carb, hopefully the guy who buys it can tune an E85 carb better than me.
Last edited by Torquemonster440; 01/22/23 01:31 AM.
1966 Satellie.. 12.55 @107.75. 906 heads. 3780 lbs.
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