Re: new distributor
[Re: jb500]
#2765567
04/18/20 05:08 PM
04/18/20 05:08 PM
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Joined: Dec 2004
Posts: 10,607 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,607
Rittman Ohio
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You really have to know where your timing is at cruise RPM then I would try another carb if you can get your hands on one. The heat increase on cruise tells me lean condition or possible timing issues. This is assuming both radiators you tried made no difference. Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: new distributor
[Re: 8urvette]
#2766015
04/19/20 04:36 PM
04/19/20 04:36 PM
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Joined: Dec 2004
Posts: 10,607 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,607
Rittman Ohio
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idle timing set at 16*
still does pop.
I hit the gas it does nothing for 1/2 a second then goes, or it pops and backfires, and has died a few times. If this were a 2 stroke i would say LEAN! does this apply to 4 stroke as well? Do you have access to another carb and can you set total timing at 34 degrees? base timing doesn't really matter with this topic you need to know where it is at 2000-2500 and the base will be whatever it is At this point in your process you have to rule out ignition or fuel ratio so you know what it isn't Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: new distributor
[Re: fourgearsavoy]
#2766041
04/19/20 05:47 PM
04/19/20 05:47 PM
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Joined: Jul 2011
Posts: 782 wine country
8urvette
OP
super stock
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OP
super stock
Joined: Jul 2011
Posts: 782
wine country
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idle timing set at 16*
still does pop.
I hit the gas it does nothing for 1/2 a second then goes, or it pops and backfires, and has died a few times. If this were a 2 stroke i would say LEAN! does this apply to 4 stroke as well? Do you have access to another carb and can you set total timing at 34 degrees? base timing doesn't really matter with this topic you need to know where it is at 2000-2500 and the base will be whatever it is At this point in your process you have to rule out ignition or fuel ratio so you know what it isn't Gus the only other carb i have is a 1050 dominator... that won't help. on 2nd through i have a 650 holley on a SBC... runs great on a very mild 350 i need to get my other timing light from my parents house to set total timing, ill try to do that soon.
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Re: new distributor
[Re: mopar dave]
#2766042
04/19/20 05:47 PM
04/19/20 05:47 PM
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Joined: Jul 2011
Posts: 782 wine country
8urvette
OP
super stock
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OP
super stock
Joined: Jul 2011
Posts: 782
wine country
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I haven’t followed this post all the way thru, but do you have good pump shot? I would adjust your mixture screws using a vac gauge. Adjust 1/8 turn each screw til you get max vacuum, then another 1/16 turn each screwLeave it there for now. Do this with low rpm and in drive. As long as you have ignition advance and enough fuel, there should be no hesitation or pop. If that doesn’t fix, than there’s something more serious going on with it. i did this, just not in drive. i did it in park. does that make much of a difference?
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Re: new distributor
[Re: 8urvette]
#2766085
04/19/20 08:07 PM
04/19/20 08:07 PM
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Joined: Jul 2007
Posts: 202 TN Hoosier
jb500
enthusiast
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enthusiast
Joined: Jul 2007
Posts: 202
TN Hoosier
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idle timing set at 16*
still does pop.
I hit the gas it does nothing for 1/2 a second then goes, or it pops and backfires, and has died a few times. If this were a 2 stroke i would say LEAN! does this apply to 4 stroke as well? Do you have access to another carb and can you set total timing at 34 degrees? base timing doesn't really matter with this topic you need to know where it is at 2000-2500 and the base will be whatever it is At this point in your process you have to rule out ignition or fuel ratio so you know what it isn't Gus the only other carb i have is a 1050 dominator... that won't help. on 2nd through i have a 650 holley on a SBC... runs great on a very mild 350 i need to get my other timing light from my parents house to set total timing, ill try to do that soon. Is your current carb a vacuum secondary variant or a double pumper? It looks like a vac sec from your pics. Have you done any "performance mods" to your carb?
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Re: new distributor
[Re: 8urvette]
#2766173
04/20/20 01:34 AM
04/20/20 01:34 AM
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Joined: Aug 2003
Posts: 43,721 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,721
Bend,OR USA
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Does the accelerator pump squirt as soon as the front throttle shaft moves? If not make sure it does, instant squirt is needed, especially off idle. I've seen and fix a bunch of "stock' Holley carbs that didn't, they all needed the pump arm screw lengthen to preload the accelerator pump properly You should have between .010 and .020 additional movement at WOT on that screw, that is why it is adjustable with the spring in it
Last edited by Cab_Burge; 04/20/20 01:35 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: new distributor
[Re: mopar dave]
#2766385
04/20/20 04:45 PM
04/20/20 04:45 PM
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Joined: Jul 2011
Posts: 782 wine country
8urvette
OP
super stock
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OP
super stock
Joined: Jul 2011
Posts: 782
wine country
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Ok, I have a purple spring and no ball in the secondaries. The small screw to adjust the vacuum secondaries is on the bottom, o off came the carb. The play or gap is in spec. I adjusted all the valves, they were all a bit tight. like 1/2 turn too tight. i used comp cams suggestions, as it is a comp cam. I took the wiggle out and then did 1/2 turn. They are a bit noisier but, I gained 1" of vacuum. Idle timing at 20* car responds well, however all in around 3k im at 50* I found a leak in the trans, the guy who rebuilt apparently didn't tighten the front pressure port plug after testing, so it is leaking. have to wait for the exhaust to cool down before i remove, seal and reinstall. I pulled the electric fan off, ordered a flew fan spacer, will install as soon as it arrives. Hope this helps cool the motor. I would think at 220* i would start to see some pinging or detonation on pump gas in a 10 to 1 motor. Maybe not?
Last edited by 8urvette; 04/20/20 05:25 PM.
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