Page 1 of 2

Mark IV AC evaporator history questions

Posted: Fri Jul 10, 2020 11:36 am
by davidh73750
Looking for history on Mark IV evaporators. I would like to know what years were which?
The models such as Allegro, Monitor and Escort model. I have not seen the escort model . I have done some googling, reading but have not come up with years. The best I can do is match advertising to the dash on the car. The top one seems the most rare to me.

member ICE n Tropics may have some answers.

The goal is to put some of these back into some older cars and pickups. David

Re: Mark IV AC evaporator history questions

Posted: Mon Jul 13, 2020 11:32 am
by ice-n-tropics
pic #1 was popular as a beer cooler when louvers are removed and holes just fit a beer can.
Pic #2 established my level of progress in AC development after I went to work for $2.50/hr in 1960 at age 18. Made every drawing on this Monitor and traveled USA to die casters etc. to get tooling. Didn't own a suit or tie, what a hoot. Kept a Machinist Hand Book and idea note pad on my bed stand. Coil tooling machinist said he could just scale my fin, end frame, tubing drawings (they were spot on accurate). Had to add 12" to left edge of large drawing to define last minute addendum of grooves on each end of die cast chrome bezel. Toolin machinist in Chicago over machined mounting holes so I used over size screw heads. Unscrew a bezel fastener and see. Now I draw my pine country lake cabin floor plan and framing ( Lake at intersection of ACR 403 & ACR 414 in Anderson county).
Escort: Smallest evaporator. Worked with Vintage Air on their reconstruction clone evap which is similar to their MARK IV unit.
Work on drawings and calculations for Sanden Compressor developed at MARK IV and patented by Bill Olson.
Milt Jones (survived by his 3 sons in Harlington (on our ac performance road test route along TX border) at Jones Auto Supply) has a museum of old MARK IV stuff.
hotrodac "How to Air Condition Your Hot Rod"

Re: Mark IV AC evaporator history questions

Posted: Mon Jul 13, 2020 4:06 pm
by bohica2xo
Hey Hog Killer! How ya been?

Who made that round cornered unit that looked like it should say "electrolux" on it? My dad had one in his '54 Cadillac Fleetwood. I can still see it in my mind, but can't recall the name. Had rectangular louvers, but where your case had grooves at the end of the louvers, it had a 1 inch radius instead.

Re: Mark IV AC evaporator history questions

Posted: Mon Jul 13, 2020 4:36 pm
by davidh73750
For Ice n tropics would it be beneficial to look for an older mark IV allegro like the one pictured vs using the newer repop vintage air mark IV? I know you said the older ones had more BTU's.
I know I've read others using an older evaporator with newer sandon compressors, condensers, lines etc and having good results.

Where is the Mark IV museum at? I'd like to see that.

Re: Mark IV AC evaporator history questions

Posted: Thu Jul 16, 2020 8:32 am
by ice-n-tropics
Boar with bad vision took his last step as he walked right up yo my pickup a few days ago.
Dad's 54 chevy had the square Mark IV with a long louver across the top front. Compressor drive belt had to be removed in winter before adaption of a clutch. Temp control by knob on suction pressure regulator "Selectrol/Robotrol " was on square evaporator.
Pic 3# was replaced by Pic #1 to look cool.
Made all drawings on Allegro then installed it in my 56 Chevy refrigerated meat PU for many years. Only problem is I needed a windshield wiper on rear window. Colder than a Alaskan's well digger's rear or a witch's breast in a brass bra.
Jones Auto Supply with several stores in TX valley border land had MARK IV units. For more on Milton Jones see Jack Chisenhall"s Acknowledgements in our book at Vintage Air "How to Air Condition Your Hot Rod". Colder
hotrodac

Re: Mark IV AC evaporator history questions

Posted: Thu Jul 16, 2020 11:59 am
by davidh73750
ice-n-tropics wrote:Boar with bad vision took his last step as he walked right up yo my pickup a few days ago.
Dad's 54 chevy had the square Mark IV with a long louver across the top front. Compressor drive belt had to be removed in winter before adaption of a clutch. Temp control by knob on suction pressure regulator "Selectrol/Robotrol " was on square evaporator.
Pic 3# was replaced by Pic #1 to look cool.
Made all drawings on Allegro then installed it in my 56 Chevy refrigerated meat PU for many years. Only problem is I needed a windshield wiper on rear window. Colder than a Alaskan's well digger's rear or a witch's breast in a brass bra.
Jones Auto Supply with several stores in TX valley border land had MARK IV units. For more on Milton Jones see Jack Chisenhall"s Acknowledgements in our book at Vintage Air "How to Air Condition Your Hot Rod". Colder
hotrodac


Were you using an A6 compressor? York? R12 I presume.

Re: Mark IV AC evaporator history questions

Posted: Thu Jul 16, 2020 3:22 pm
by ice-n-tropics
56 PU; 6^' clutch York 2 banger (pre 1971 Sanden) and 1.125 thick modine condenser and deep 6 blade engine fan and R12. built a custom bed floor and painted it 2 tone myself inside and out.
2xo: I rigged carriers in the bed for 2 custom made 1 tooth shy tranny sprocket wall climber trail bikes and ramps. Won my wife's heart as cc riders 51 years ago. Also, Built a all aluminum bike with turf tires, a jack shaft with variable speed pulleys, monswter rear sprocket and the gas in horizontal frame tube.
hotrodac

Re: Mark IV AC evaporator history questions

Posted: Sat Jul 18, 2020 12:27 pm
by bohica2xo
Ice;
The OHV version of my single is at 803 cc's now. Quite a popper, with the 4.75 inch stroke. No track time since January because of the virus mess.

Yotes took a beating this spring. Nothing better to do than sit up all night waiting for them. Cougars have replaced them for rabbit control.

Have been using the 21" Trailblazer fan on projects for a while. Seems to work good with that integrated rim.

Re: Mark IV AC evaporator history questions

Posted: Sun Jul 19, 2020 3:28 pm
by ice-n-tropics
Must be lot's of engineering and some metallurgy in your 803 cc enhanced intake B-Popper.
hotrodac

Re: Mark IV AC evaporator history questions

Posted: Tue Jul 21, 2020 12:25 pm
by davidh73750
It’s nice to use your parts car as a mock up.