400SBC carbed overheating in hot weather
08-24-2010, 02:35 PM
#52
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Car: 87 T/A
Engine: 400SBC Carb'd
Transmission: T56, Kevlar clutch
Axle/Gears: 3.73 Yukon Duragrip posi
Re: 400SBC carbed overheating in hot weather
gotcha. I'm all for measuring it at the engine, but how do I actually hook it up? I'm assuming stock won't work, since the computer seemed to control at least some of it.
So what kind of aftermarket switch to I need? Thanks...
So what kind of aftermarket switch to I need? Thanks...
08-24-2010, 02:37 PM
#53
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Car: 87 T/A
Engine: 400SBC Carb'd
Transmission: T56, Kevlar clutch
Axle/Gears: 3.73 Yukon Duragrip posi
Re: 400SBC carbed overheating in hot weather
Oh, I know, but my 400 REALLY doesn't like it up there, I have a tendancy to run lean some times, which with the 9-1 compression, makes it cranky at 210ish. I've had problems with detonation before. I'm running 89 Octane fuel, and havn't had any problems, it just doesn't respond as well at those temps IMO.
08-24-2010, 03:20 PM
#54
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Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Re: 400SBC carbed overheating in hot weather
The computer didn't control the fan in most models. The fan switch simply grounded the control leg of the fan relay using a single wire switch (ground through engine block). Most aftermarket two-wire temp switches will install in the stock location or can be installed in the water neck or manifold with an adapter (if needed).
08-25-2010, 06:12 PM
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Car: 87 Camaro
Engine: 305
Transmission: 700R4
Re: 400SBC carbed overheating in hot weather
I have that problem, too. My car can sit at 190 and run fine but as soon as it hits 200 it just starts to sound terrible...
08-25-2010, 07:41 PM
#56
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Car: 87 T/A
Engine: 400SBC Carb'd
Transmission: T56, Kevlar clutch
Axle/Gears: 3.73 Yukon Duragrip posi
Re: 400SBC carbed overheating in hot weather
what compression ratio are you running, and with what fuel? Because if it's that bad, you might really have a problem...
08-26-2010, 08:33 PM
#57
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Car: 87 Camaro
Engine: 305
Transmission: 700R4
Re: 400SBC carbed overheating in hot weather
I don't know and I run regular unleaded. I don't think its the gas, though I think its the heat. I can't really describe the sound...
08-26-2010, 08:41 PM
#58
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Car: 87 T/A
Engine: 400SBC Carb'd
Transmission: T56, Kevlar clutch
Axle/Gears: 3.73 Yukon Duragrip posi
Re: 400SBC carbed overheating in hot weather
does it sound like a pinging noise? or a mechanical slapping sound? that would be detonation going off before the spark does. it's EXTREMELY hard on pistons...
08-26-2010, 09:01 PM
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Car: 87 T/A
Engine: 400SBC Carb'd
Transmission: T56, Kevlar clutch
Axle/Gears: 3.73 Yukon Duragrip posi
Re: 400SBC carbed overheating in hot weather
Ok guys, so here's a question, what's the fitting size for the head? alot of the summit sending units say "3/8-18 NPT" others say "1/8-20 NPT" and the second one says "inline style" sending unit???? Here are the links...
http://www.summitracing.com/parts/DER-16739/
http://www.summitracing.com/parts/DER-16721/
Thanks...
http://www.summitracing.com/parts/DER-16739/
http://www.summitracing.com/parts/DER-16721/
Thanks...
08-29-2010, 11:29 AM
#60
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Car: 87 T/A
Engine: 400SBC Carb'd
Transmission: T56, Kevlar clutch
Axle/Gears: 3.73 Yukon Duragrip posi
Re: 400SBC carbed overheating in hot weather
ok... doesn't seem like this would be a hard question for someone who knew the answer... 
08-30-2010, 08:45 AM
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Car: 87 T/A
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Axle/Gears: 3.73 Yukon Duragrip posi
08-30-2010, 08:47 AM
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Car: 87 T/A
Engine: 400SBC Carb'd
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Re: 400SBC carbed overheating in hot weather
Ok, so my heads are GM "487x" casting heads, I think they were a performance casting, (maybe vett?), but I have NO IDEA how old they are... I know that all of the sensors that went in my thirdgen (87) heads also fit in these, so they are the same as 87 heads, except for the valve cover bolts of course...
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