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Joined: Dec 2004
Posts: 22
Grease Monkey
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Grease Monkey
Joined: Dec 2004
Posts: 22 |
Hello everyone!
Our 57 Chevy 4-door Sedan (BelAir) came from the factory as single exhaust (car is featured in this month's G & D on back cover + page 17).
Since the pictures were taken and piece written we have moved to TN (Manchester area).
We would like to put dual exhausts on the car. Is that acceptable or a real "no-no".
I have been told both "no" and "yes...if it is like the dual exhaust available on 57 Chevys from the factory"
Which is correct?
Many thanks!!!
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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Joined: Dec 2001
Posts: 500
Oil Can Mechanic
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Oil Can Mechanic
Joined: Dec 2001
Posts: 500 |
The dual exhaust came with the 220hp 4bc 283 and larger engines as standard equipment. It was not a option on the 185hp 2bc 283 which only came with the single exhaust system.
wdoftexas
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
And if the duals are installed (considered incorrect) the brake and fuel line needs to be moved from the inside of the right frame rail to the out side.This prevents heating up of the gas and brake fluid.
Having a 1957 with duals (and 4 barrel) I would leave well enough alone if it were my car.
Gene Schneider
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Joined: Dec 2004
Posts: 22
Grease Monkey
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OP
Grease Monkey
Joined: Dec 2004
Posts: 22 |
Thanks for the reply!
5chevy7
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Joined: Dec 2005
Posts: 1,136
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Dec 2005
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I did what you are talking about to my '57 back when I first got it in the early '70's. It was a pain to do.
When I restored the car (finished last year) I put it back to original with the single exhaust. Not only is it original now but it was a lot cheaper to do and much easier.
People are like a box of chocolates you never know what you are going to get...
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Joined: Feb 2005
Posts: 84
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Feb 2005
Posts: 84 |
One of the factors I would be concerned about in converting an engine designed to run with a single exhaust to a dual exhaust is the effect it would have on the condition of the engine, especially the valves. Although a less restricted exhaust helps to achieve a little extra horsepower, does it not cause the temperature of the valves to increase, thereby making them predisposed to burning?
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The dual exhaust has no effect on the valves.It would actually allow the exhaust valves to run cooler at full throttle/speed as the lower back pressure would allow the burnt exhaust gases to exit faster.The 185 HP single exhaust cars and the 220 HP dual ex. cars used the same eahaust valves, in spite of the 220 HP have a 4 barrel carburetor and higher compression ratio.The 283 HP FI engine ex. valves were lightened and polished, other than that nothing special.
Gene Schneider
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Joined: Dec 2001
Posts: 11,162
ChatMaster - 10,000
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ChatMaster - 10,000
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Life's a long winding trail, love Jesus and ride a good horse!
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ChatMaster - 4,000
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ChatMaster - 4,000
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Well worded Mac. :eek: :confused: :eek:
Nonetheless I think I agree. I'd much rather have the "tunes" of the duals. Give a rip about 'technically correct / original' etc.
Bill.
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