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#1
07-31-2004, 07:33 AM
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Hello All, Here the things that i have done to the car so far. I have replaced the stamped impeller pump with a cast impeller and adjusted the clearance of the plate as sugested by George. Have tried a 160 and 180 thermostat both stock and high flow. Car has a 4 core radiator in it with electric puller and pusher fans. The motor seems to do fine at idle, my problem is that it overheats while driving, gets to about 210-215 range. I have read in these forums that a stock 400 bird has a fin under the lower valance to help pull air up into the radiator? Could this be my problem, the fact that a 350 bird does not have this?
If anyone has a picture of the 400 bird setup i would love to see it. Thanks in advance for any help. Pete
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1969 Firebird, 406 cid, #62's flowing 243 int - 215 ex @ .500, Torker II, Edelbrock EVS Thunder 825 cfm carb, MSD Dist & box, Big HYD cam(too big), 4 Tube Headers into 2 1/2" Duals, TH400 tranny with 3500 stall, 9" rear end with 3.90 gears, MT Indy Profile Tires 28" tall. Best run 12.43 @ 111. |
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#2
07-31-2004, 07:33 AM
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Hello All, Here the things that i have done to the car so far. I have replaced the stamped impeller pump with a cast impeller and adjusted the clearance of the plate as sugested by George. Have tried a 160 and 180 thermostat both stock and high flow. Car has a 4 core radiator in it with electric puller and pusher fans. The motor seems to do fine at idle, my problem is that it overheats while driving, gets to about 210-215 range. I have read in these forums that a stock 400 bird has a fin under the lower valance to help pull air up into the radiator? Could this be my problem, the fact that a 350 bird does not have this?
If anyone has a picture of the 400 bird setup i would love to see it. Thanks in advance for any help. Pete
__________________
1969 Firebird, 406 cid, #62's flowing 243 int - 215 ex @ .500, Torker II, Edelbrock EVS Thunder 825 cfm carb, MSD Dist & box, Big HYD cam(too big), 4 Tube Headers into 2 1/2" Duals, TH400 tranny with 3500 stall, 9" rear end with 3.90 gears, MT Indy Profile Tires 28" tall. Best run 12.43 @ 111. |
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#3
07-31-2004, 11:39 AM
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It is my understanding that "pusher" fans are a bad idea. They actually ristrict airflow at cruise speed (exactly where you are having you're problem). Since you've already done the "water pump clearance thing" I would remove the pusher fan.
Also, timing and fuel mixture will affect temps. (But I would start with the fan.) Bob |
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#4
07-31-2004, 01:10 PM
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Removed the pusher fan and temp still got up to 215, i will mess around with the timing and carb and see what happens. Thx for the reply.
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1969 Firebird, 406 cid, #62's flowing 243 int - 215 ex @ .500, Torker II, Edelbrock EVS Thunder 825 cfm carb, MSD Dist & box, Big HYD cam(too big), 4 Tube Headers into 2 1/2" Duals, TH400 tranny with 3500 stall, 9" rear end with 3.90 gears, MT Indy Profile Tires 28" tall. Best run 12.43 @ 111. |
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#5
07-31-2004, 05:32 PM
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The 400 bird's had a sort of chin spoiler on it behind the lower valance to direct air up into the radiator.The also had filler panels between the front bumper and the radiator support under the hood to keep the air goine thru instead of around the radiator.As for the fans, you can't beat a heavy duty clutch fan and the original fan shroud.Mine always ran hot with the electric fans.Also, if your radiator is an older one it's not very efficent at cooling.I went with a new aluminum radiator, the stock fan with a new clutch, and a flow cooler water pump, temp never goes above 180.This is on an engine that is far from stock.You can do without the aluminum radiator, but at least get a newer, more modern copper/brass one.
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#6
08-01-2004, 07:09 AM
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#7
08-01-2004, 04:47 PM
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Thanks for the info guys, i am going to do some more little tweaks and see what happens, wish me luck
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1969 Firebird, 406 cid, #62's flowing 243 int - 215 ex @ .500, Torker II, Edelbrock EVS Thunder 825 cfm carb, MSD Dist & box, Big HYD cam(too big), 4 Tube Headers into 2 1/2" Duals, TH400 tranny with 3500 stall, 9" rear end with 3.90 gears, MT Indy Profile Tires 28" tall. Best run 12.43 @ 111. |
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