whiskey1954
Contributor
Posts: 479
Loc: central north carolina
Reg: 12-07-08
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05-04-12 04:48 AM - Post#2222279
Any of you folks ever do away with the heat flap in the exhaust manifold without affecting the way the car runs except on cold mornings thinking about just taking it out and welding up the holes
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 2-28s313233
"3rd Year" Silver Supporting Member
Posts: 516
Age: 76
Loc: DFW Texas
Reg: 02-24-05
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05-04-12 05:41 AM - Post#2222291
In response to whiskey1954
I have had a couple of split manifolds that had the flapper removed and the holes welded up. They ran fine. But, this was in californa in the Sacramento valley. Mild weather.
Cleon
1928 Chevy touring
1942 Chevy Sport coupe
1949 Chevy Sport coupe
1954 Chevy Bel Air HTP
1970 El Camino
1971 Monte Carlo |
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 2blu52
"12th Year" Silver Supporting Member
Posts: 13139
Age: 79
Loc: Montana
Reg: 03-12-02
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05-04-12 10:38 AM - Post#2222365
In response to whiskey1954
Gm spent some bucks to design this for proper driveability in cooler weather. It takes about 10 minutes to properly install a new thermostatic spring and about twice a year grab hold of it and move it through the full range of movement. With out it you will have problems. I just converted to cast iron headers a heat kit came with them but I need to find a way to provide more heat as even at 55 degrees it has a bad stumble coming off idle and the stumble is not related to any thing but lack of heat. 
"PEACE IS THAT GLORIUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"
THOMAS JEFFERSON |
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Brian48
Forum Newbie
Posts: 75
Age: 30
Loc: Magnolia, TX
Reg: 06-18-12
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07-13-12 06:02 PM - Post#2247933
In response to 2blu52
When the spring is installed, should the flap be open or closed before you start the engine. To me, the spring is holding it OPEN, which is the opposite of what I want. Please advise.
| There are two ways to see life... the way where every challenge is an opportunity... or where every opportunity becomes a challenge. |
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Oldengineer
Contributor
Posts: 395
Loc: Cross Lanes, WV
Reg: 08-16-10
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07-13-12 07:31 PM - Post#2247956
In response to whiskey1954
Whiskey:
When I first bought my 48, the exhaust manifold had the heat riser flapper removed. I had bad hot start issues, because the carb got so hot that it boiled the fuel out of the bowl. I replaced the exhaust manifold with one that had an operable flap, and, now she hot starts just fine.
Regards:
Oldengineer
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whiskey1954
Contributor
Posts: 479
Loc: central north carolina
Reg: 12-07-08
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07-13-12 07:51 PM - Post#2247965
In response to Brian48
the flap should be positioned when cold to allow heat from exhaust to get to bottom of intake and carb as it warms up the spring will gradually close off the heat to direct it out the exhaust pipe make sure you have installed spring properly to the flap I believe when installing spring put it on the riser rod first in a way that you only twist the spring or adjust to top pin 1/2 round of tension on spring also when spring is off if know one has tampered with the counter weight on opposite side of manifold from spring with this free of the spring turn the weight and it should return to the position of blocking heat from carb Hope this helps and I explained it correctly The hook on the spring to the top pin should go underneath not over the top
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2blu52
"12th Year" Silver Supporting Member
Posts: 13139
Age: 79
Loc: Montana
Reg: 03-12-02
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07-15-12 02:51 PM - Post#2248469
In response to Brian48
The spring does not pull anything. As it heats it relaxes and allows the exhaust to force the butter fly open.
"PEACE IS THAT GLORIUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"
THOMAS JEFFERSON |
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Brian48
Forum Newbie
Posts: 75
Age: 30
Loc: Magnolia, TX
Reg: 06-18-12
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07-18-12 05:35 AM - Post#2249366
In response to 2blu52
Obviously, the butterfly needs to close to keep heat off the carb. I would just like to know which direction is closed. Then, I can adjust the spring to make it work. The manual indicates closed is counter-clockwise standing at the front of the car with the riser on the right of the engine, but the site that you guys have linked to on stovebolt and my53chevy is opposite. Which one is it?
| There are two ways to see life... the way where every challenge is an opportunity... or where every opportunity becomes a challenge. |
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ruscar
Member
Posts: 50
Loc: GA
Reg: 12-22-06
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07-18-12 03:15 PM - Post#2249605
In response to Brian48
The manual indicates closed is counter-clockwise standing at the front of the car
is correct. When the motor is cold, the "hump" or half circle is on top, 12 o'clock and the "flat" side is at the 6 o'clock. This is the open position. When the motor is hot, the half circle will be at the 10 o'clock and the flat will be at the 4 o'clock or closed. I think I wrote it right?
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