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258 head suggestions |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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Posted: Jan/10/2019 at 11:18pm |
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oh absolutely. i wasn't saying that i made the right decision! lol. stable intake temp is nothing but good, and the electric pre-heat would help startup/warmup even here in LA. i was just lazy.
that's pretty interesting, that Hudson info... Hudson's more or less forgotten, they 'went away' at a bad time, and in a bad way... even distribution is one of the better design features of the 195.6 OHV. it helps that it's a short motor, but the funny anti-reversion wedges are probably there from experience. i wonder if AMC did anything internally with Hudson's inline engine experience. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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I would retain the coolant flow through the manifold and the electric heater in the plenum even with TBI.
The TBI system monitors the oxygen content of the exhaust at the collector, it cannot monitor each cylinder individually. It has no idea which cylinders may be running rich or lean, all it knows is the average for all cylinders. Similarly, the injectors cannot change the fuel mixture for each cylinder individually, only the average. A cold intake manifold does a poor job of vaporizing fuel, so liquid fuel will tend to puddle in the manifold and run iregularly into cylinders. This will make some cylinders run rich and some run lean even though the TBI system says the average fuel mixture for all cylinders is correct. This is not only bad for engine smoothness and power, but is also bad for engine longevity. The faster the intake manifold reaches operating themperate and stays there, the more uniform the fuel delivery will be to all six cylinders. The better the engine will run, and for more miles. Warming up the manifold quickly on cold starts will also allow the TBI system to lean the fuel mixture out sooner rather than continue with cold start enrichment fuel mixtures. It's the same as releasing the choke quicker on a carbruetor. Better fuel economy, drivability, power, engine life, and oil life will result. Inline sixes are long engines and the AMC six is particularly long even for an inline six. Uneven fuel distrinution is the bane of long engines. Much can be gained from preventing it. The Twin-H-Power dual carbruetor Hudson engines did not have any more total carbruetor airflow than the standard single carbruetor H-145 engines. The 20 horsepower advantage of the Twin-H-Power over the standard single carb was more uniform fuel distribution. Nash did the same thing with the LeMans Duel Jetfire. Edited by FSJunkie - Jan/10/2019 at 12:19am |
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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i ran a GM TBI system (packaged by Howell) on the 82 or 83 aluminum intake, didn't plumb the water to irt and never wired the electric heater. it ran just great. on a '70 232ci in a 63 wagon. tuned it up with all the Moates stuff. that's a lovely intake, no problem believeing it's as good or better than the old clifford stuff. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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DaemonForce
AMC Addicted Joined: Jul/05/2012 Location: Olympia, WA Status: Offline Points: 1070 |
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A TBI system on that manifold really surprises me. This is probably the best setup you could hope to have on a 258.
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1971 Javelin SST
American 304 2v | FMX | AM20-3.31 1983 American Limited Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72 |
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irish13jeff
AMC Apprentice Joined: Aug/13/2011 Location: Florida Status: Offline Points: 181 |
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Like these? I’m running EFI and in Florida,think it’s worth running? I’ve only had it for a short time and it ran fine, so not sure if worth the change..
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Please don't tell my parents I'm a truck driver..... They think I'm a piano player in a whore house...
http://www.legionofjeepers.com |
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irish13jeff
AMC Apprentice Joined: Aug/13/2011 Location: Florida Status: Offline Points: 181 |
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Please don't tell my parents I'm a truck driver..... They think I'm a piano player in a whore house...
http://www.legionofjeepers.com |
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irish13jeff
AMC Apprentice Joined: Aug/13/2011 Location: Florida Status: Offline Points: 181 |
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Please don't tell my parents I'm a truck driver..... They think I'm a piano player in a whore house...
http://www.legionofjeepers.com |
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DaemonForce
AMC Addicted Joined: Jul/05/2012 Location: Olympia, WA Status: Offline Points: 1070 |
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Look at the big plugs at the start of the #1 and #6 runner curves. Those are ports typically sealed in place with threaded pipe that gets clamped from the water pump and heater valve routes. If I remember correctly, the design is to cool the intake from errant hotspots associated with being so close to the exhaust manifold. I consider it to be a form of insurance.
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1971 Javelin SST
American 304 2v | FMX | AM20-3.31 1983 American Limited Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72 |
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irish13jeff
AMC Apprentice Joined: Aug/13/2011 Location: Florida Status: Offline Points: 181 |
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humm ,mine didn’t have any water circulation?
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Please don't tell my parents I'm a truck driver..... They think I'm a piano player in a whore house...
http://www.legionofjeepers.com |
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Pdok
Supporter of TheAMCForum Joined: Apr/03/2011 Location: Alabama Status: Offline Points: 1021 |
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Nope, not needed for yours. You might want to block up the EGR passages on that 83 intake if you're not putting EGR back in operation. I ran that exact intake for a while, thought it worked great, and I couldn't tell the difference between it and the Clifford I had been using, with the same Weber 38 installed.
I liked having the water circulating, but I never got around to hooking up the electric heater under the carb because it would have needed another relay and more wiring. It never seemed to matter though, even in some really cold Oklahoma winters. Good luck with it.
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76 Grem X 258/904,4.0 head/MPFI, Comp X250H cam, Hughes springs, Clifford header, serpentine swap.
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