viven44 Posted August 7 Share Posted August 7 It doesn’t work quite like that, as explained here: https://www.garysgaragemahal.com/chokes.html Well I was really off on that one. Thanks much!! “as the engine warms up, manifold heat transmitted by hot air to the choke housing relaxes the bimetal permitting the choke to open.” Link to comment Share on other sites More sharing options...
Gary Lewis Posted August 7 Share Posted August 7 Well I was really off on that one. Thanks much!! “as the engine warms up, manifold heat transmitted by hot air to the choke housing relaxes the bimetal permitting the choke to open.” I think that write up is wrong. Since the 351HO has a choke relay and the 460 appears not to have one then they must have had different choke heaters. The only way to prove that is to ohm out the respective heaters. I have a 4180 off of an HO I think, although I’d have to run the numbers on the carb to make sure. If so I can measure its resistance. But does someone have a 4180 they know is off a 460? Link to comment Share on other sites More sharing options...
viven44 Posted August 7 Share Posted August 7 I think that write up is wrong. Since the 351HO has a choke relay and the 460 appears not to have one then they must have had different choke heaters. The only way to prove that is to ohm out the respective heaters. I have a 4180 off of an HO I think, although I’d have to run the numbers on the carb to make sure. If so I can measure its resistance. But does someone have a 4180 they know is off a 460? I have both of them. One of a 351 HO truck, and one (maybe 2) of a 460. I had more of these but gave them away to a colleague that liked keeping things original Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 7 Share Posted August 7 I think that write up is wrong. Since the 351HO has a choke relay and the 460 appears not to have one then they must have had different choke heaters. The only way to prove that is to ohm out the respective heaters. I have a 4180 off of an HO I think, although I’d have to run the numbers on the carb to make sure. If so I can measure its resistance. But does someone have a 4180 they know is off a 460? Is there a unique part # for the 351? Link to comment Share on other sites More sharing options...
BigBrother-84 Posted August 7 Author Share Posted August 7 I think that write up is wrong. Since the 351HO has a choke relay and the 460 appears not to have one then they must have had different choke heaters. The only way to prove that is to ohm out the respective heaters. I have a 4180 off of an HO I think, although I’d have to run the numbers on the carb to make sure. If so I can measure its resistance. But does someone have a 4180 they know is off a 460? Gentlemen, following this discussion with great interest. Although I still have an interrogation, about the "with or without relay" question: Why the 1984 EVTM has no mention about such relay, for gasoline with idiot light or ammeter. It doesn't specify any difference between different engines (460, 351 HO, ...). You have opinion about that, are other EVTM editions different? If I wasn't on this (wonderful!) forum and just had the 1984 EVTM on hands, I would be sure that Big Bro's choke heater (7V) is perfectly wired, and I would have no idea about any 351 HO choke relay existence. Or maybe somewhere else in EVTM and I just don't find it? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 7 Share Posted August 7 Gentlemen, following this discussion with great interest. Although I still have an interrogation, about the "with or without relay" question: Why the 1984 EVTM has no mention about such relay, for gasoline with idiot light or ammeter. It doesn't specify any difference between different engines (460, 351 HO, ...). You have opinion about that, are other EVTM editions different? If I wasn't on this (wonderful!) forum and just had the 1984 EVTM on hands, I would be sure that Big Bro's choke heater (7V) is perfectly wired, and I would have no idea about any 351 HO choke relay existence. Or maybe somewhere else in EVTM and I just don't find it? It's definitely in the '86 EVTM. I just posted the schematic for someone else. Link to comment Share on other sites More sharing options...
viven44 Posted August 7 Share Posted August 7 It's definitely in the '86 EVTM. I just posted the schematic for someone else. Good point... I can see the 1985/86 EVTM showing a choke relay for the 351W 4V HO... There is no mention of a Choke relay under carburetor circuits on a 1984 EVTM ? The 351 HO carb I have came from a 1984... I know Ford likes change.. so wouldn't be surprised they changed things up from 84 to 85.... I would love to be fly on the wall in their change control dept !! Never a dull day I'm sure Link to comment Share on other sites More sharing options...
BigBrother-84 Posted August 7 Author Share Posted August 7 I can see the 1985/86 EVTM showing a choke relay for the 351W 4V HO... Can you post a screenshot so I could see how it looks, and maybe find it in my 1984 edition? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 7 Share Posted August 7 I can see the 1985/86 EVTM showing a choke relay for the 351W 4V HO... Can you post a screenshot so I could see how it looks, and maybe find it in my 1984 edition? Link to comment Share on other sites More sharing options...
viven44 Posted August 7 Share Posted August 7 I can see the 1985/86 EVTM showing a choke relay for the 351W 4V HO... Can you post a screenshot so I could see how it looks, and maybe find it in my 1984 edition? About the 4180 carb differences for the 1984 model year, this is from the factory manual Looks like 5.8 HO uses 7V stator in 1984 Link to comment Share on other sites More sharing options...
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