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140 A.I.R. exhaust manifolds
Posted by: Colorsarge ()
Date: November 24, 2019 04:26PM

I recently purchased a '66 Corsa which was built in California with A.I.R. System. Most of the smog stuff is gone. The original exhaust manifolds remain.. Would there be any performance advantage to swapping them out for none A.I.R. manifolds? Thanks from lower, slower Delaware.

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Re: 140 A.I.R. exhaust manifolds
Posted by: MattNall ()
Date: November 24, 2019 05:21PM

Few of us have even had the chance to find out!


Welcome to the CCF!

If you can drive it for a while like this.... then offer them up for Sale / trade for a pair on NON-A.I.r. manifolds and you can tell us!

Otherwise it's dyno time with both.

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: 140 A.I.R. exhaust manifolds
Posted by: Timothy Shortle ()
Date: November 24, 2019 06:40PM

The A I R exhaust manifolds (if complete) would be a little bit more restricted than stock 140.

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Re: 140 A.I.R. exhaust manifolds
Posted by: john.jackson ()
Date: November 25, 2019 02:08PM

Timothy Shortle Wrote:
-------------------------------------------------------
> The A I R exhaust manifolds (if complete) would be a little bit more restricted than stock 140.


And a bit heavier also.

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Re: 140 A.I.R. exhaust manifolds
Posted by: Layton Curtis ()
Date: November 25, 2019 02:36PM

The A I R manifolds are I/8" dia larger at the outlet. I sawed the air tubes off and brazed up the air intake holes about 44 years ago and use them to this day. I didn't like the big bulging runner and that was all I had at the time.

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Re: 140 A.I.R. exhaust manifolds
Posted by: Gatorfly ()
Date: November 25, 2019 05:45PM

Layton Curtis Wrote:
-------------------------------------------------------
> The A I R manifolds are I/8" dia larger at the outlet.


Would that 1/8” larger outlet not make them less restrictive then?

My 66 sedan has the 140 AIR package and all the original smog equipment still functional (Belt is currently off the pump) so this is interesting info.

San Juan Islands, WA

1963 Spyder Conv Laurel Green/Black/White
1965 Corsa 140/4 Mist Blue/Black (2nd owner)
1965 Corsa Conv 140/4 Tahitian Turquoise/White/White
1965 Monza 110/4 Evening Orchid/Black (2nd Owner)
1963 Rampy 110/4
1966 Monza "More Door" 140/4 Willow Green/Black

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Re: 140 A.I.R. exhaust manifolds
Posted by: jjohnsonjo ()
Date: November 25, 2019 06:55PM

Thought I read somewhere they were made of superior material ??????????

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: 140 A.I.R. exhaust manifolds
Posted by: MattNall ()
Date: November 25, 2019 07:41PM

A.I.R. and AC'd have Stainless Exh. Tubes

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: 140 A.I.R. exhaust manifolds
Posted by: Timothy Shortle ()
Date: November 25, 2019 08:14PM

Not to switch gears but I have heard the direct air heater works better when used with A I R manifolds. I guess they are bigger/more meat on them which provides more heat for the heater. Currently 33 degrees F in Durango and snowing heavy.

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Re: 140 A.I.R. exhaust manifolds
Posted by: American Mel ()
Date: November 25, 2019 08:31PM

Timothy Shortle Wrote:
-------------------------------------------------------
> Not to switch gears but I have heard the direct air heater works better when used with A I R manifolds. I guess they are bigger/more meat on them which provides more heat for the heater. Currently 33 degrees F in Durango and snowing heavy.


The heater would be "working better", because the manifolds are much HOTTER due to the secondary combustion process going on inside of them from the injected oxygen.
ie; A.I.R. - Air Injection Reactor

-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
Have; '66 Monza Coupe - 140, 4-spd. Daily driver beater
'67 Monza Vert. - 140, 4-spd. Daily driver beater
'67 A/C Moredoor Monza
Have had; '61 Monza coupe, '62 Monza Wagon, '63 Spyder, '65 Corsa
.
non-vair
'04 Dodge Cummins Quad Dualy, approaching 400K
17'Terry

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Re: 140 A.I.R. exhaust manifolds
Posted by: Colorsarge ()
Date: November 26, 2019 03:41AM

Thanks for the input, guys. At this point, I'm thinking the difference in performance once the A.I.R. Tubes removed would not be worth the cost of replacement. Weight not an issue on a street car. Would be running headers for a track car anyway.

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Re: 140 A.I.R. exhaust manifolds
Posted by: 67 airvair ()
Date: November 26, 2019 05:03AM

I can tell you from personal experience what difference the A.I.R. vs the standard setup makes.

I bought an original '69 with 140 back in '72. It had just 26,000 miles on it, daily driven. I installed a Corsa dash, and had the tach working. In driving it, it was useless to rev it over 2500 RPM, as it was simply dead above that. Even had the famed Mike McKeel tune it up, but to no avail.

I then installed a/c in it, and removed the A.I.R. equipment, including swapping out the carbs, distributor, and exhaust manifolds to standard issue parts. Finally, the car came alive, and loved to be rev'ed right up to redline.

In telling Mike the results, he claimed it hadn't been tuned up properly. I then reminded him that HE had tuned it up. Case closed! LOL

The proof of the pudding is in the eating, as the old saying goes.grinning smiley

-Mark

P.S. BTW, Tim is absolutely right. There is nothing that has a hotter heater than the smogger heater. Those manifolds absolutely glow a bright cherry red when running.

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Re: 140 A.I.R. exhaust manifolds
Posted by: Timothy Shortle ()
Date: November 26, 2019 12:14PM

I was referring to using A I R exhaust manifolds in a car WITHOUT the A I R system (as there is more metal there) for better/hotter direct air heater system. This I have heard, I have no first hand knowledge nor have I ever done any research or comparisons. Current temperature in Durango CO is 30 degrees F.

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Re: 140 A.I.R. exhaust manifolds
Posted by: steve c goodman ()
Date: November 26, 2019 01:52PM

It sounds reasonable that the larger 'mass'
of the smog exh logs whether 110 or 140 would
hold more heat.

I scoff at your 30 degrees Tim. 5 above
zero here tonight

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry

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Re: 140 A.I.R. exhaust manifolds
Posted by: Colorsarge ()
Date: November 26, 2019 04:58PM

Mark, Your description as "dead above 2500 rpm" fits this car to a tee. Just bought it and haven't had time to tune it and set up the carbs yet. Food for thought. Thanks!

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Re: 140 A.I.R. exhaust manifolds
Posted by: Wagon Master ()
Date: November 27, 2019 06:40AM

67 airvair Wrote:
-------------------------------------------------------
> I can tell you from personal experience what difference the A.I.R. vs the standard setup makes.
In driving it, it was useless to rev it over 2500 RPM, as it was simply dead above that.

Is 2500 RPM the number you meant to put in your post?

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Re: 140 A.I.R. exhaust manifolds
Posted by: 67 airvair ()
Date: November 28, 2019 08:15AM

Wagonmaster,

Yep, it was dead above that.

-Mark

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Re: 140 A.I.R. exhaust manifolds
Posted by: RexJohnson ()
Date: November 28, 2019 08:45AM

My '69 140 with complete working smog with the smog carbs and dist. will easily rev past 2500 rpm. If yours won't it is not the exhaust manifolds. The mufflers could be plugged. You could loosen the pipe flange at the manifold and see if it revs better but, it will be loud.

RJ tools
Salem,Oregon

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Re: 140 A.I.R. exhaust manifolds
Posted by: 67 airvair ()
Date: November 28, 2019 01:10PM

I didn't say it wouldn't rev past 2500. It's just that the power was flat above that. Usually, you expect it to produce more power with higher revs.

The only change I made was to replace the A.I.R. parts (carbs, distributor, and exhaust manifolds) with the standard stuff. It was in tune before and was in tune after, same mufflers, no other difference.

Don't ask me to explain the results, but this is what my experience was.

-Mark

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Re: 140 A.I.R. exhaust manifolds
Posted by: Vairismo ()
Date: November 28, 2019 05:52PM

It's possible that these non performing smog engines with smog stuff removed may have the 95 horse profile camshafts. Just a guess at what may contribute to the lack of performance there. Things not optimized together properly maybe.

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