my poor dead engine

48Austin

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1964 Commercial, 1948 Austin, 58 Pan
Don't you mean when Corona :crap: ends?
 

Darius

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Just another point of interest. Just got back from a 20 mile jaunt, mostly at 60 MPH. With the outside temp at 91* I was running a constant 185 degrees with a 160 degree thermostat and a "stock" Cu/Brass 4 row radiator. Running 34 degrees total mechanical advance at 3000 RPM (60 = 3000) and NO vacuum advance involved.
When I came back to city streets and switched on the vacuum advance The twin 16 inch fans held the temperature to 195* but at idle at a stop light the temp went up to 200* and stayed there.
Greg Surfas
Bro. Greg,

Just wondering why you didn't have vacuum advance hooked up while doing the highway run?

bro. d
 

Cadillac Kid 1

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Good question bro.d. I turn the vacuum off when the revs get close to 3000 in high gear. When I first started breaking the motor in I left the vacuum on. It took me a while to figure that the "surging" I was getting at 65 and 70 MPH was not the engine coming on the cam but too much advance. At 60 mph in cruise I am pulling between 17 and 18 inches of vacuum which "floors" the vacuum can. At cruise the vacuum advance is intended to improve mileage, but at my 7 MPG is good enough for the use this car is going to get.
I need the vacuum advance for idle and low speeds to keep it cool and let it idle.
Compromise, compromise, compromise.
Greg Surfas
 

Darius

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https://www.holley.com/products/ign...ccessories/distributor_components/parts/31035

https://documents.holley.com/accel_instructions_vacuum_advance_gm_hei_v8_31035.pdf

Bro. Greg,

That makes perfect sense. Too much advance at cruise can cause the engine stuttering, bucking that you experienced.

I’m sure that you are aware of adjustable vacuum advance canisters, but in case others on the list aren’t here are a couple of links about how to set them.

By the way, what camshaft do you have in that engine? Those are impressive vacuum numbers - especially to a guy living at 4390 Ft. Elevation.

Best,

bro. d
 

Cadillac Kid 1

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bro d.
If you are talking about me I live in San Antonio, Texas, elevation 790 Ft.MSL. The adjustable Vacuum canisters limit the maximum advance. I need a good 10 degrees at 5 inches which is what my motor will pull if I only have the Initial 14* mechanical advance. If the 10* was my vacuum it would be way too much at 3000 RPM and a total mechanical and initial advance of 34* Hense, I turn the vacuum off when I am in cruise at 3000 RPM. If that was the only compromise I have to make to drive this thing on the street (no AC in Southern Texas) I would be very happy.The cam is an MTS (Lunati) roller 240/253* at 0.050 on 112* LCL.
Greg Surfas
 

richie49

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Okay ,i have a little to report on my corvair, not much but since the temps on my cooling system do not want to stay somewhat stable I am going to a front mounted radiator. I have a 4 row 5/8 tube radiator 33 1/2 inch wide and 18.8 high. If you look back at the pics you will see I have very little room for it. The
spot it will set in doesnt actually have room. Due to measuring the space wrong(shape of hood) I am fighting it to fit. I think I got that figured out but not fixed up yet.. I'm going with the manual fan 17 inch blade with 7 blades . I believe I have that all going my way. It'll be sometime late july before I get it set in and running. Going up to montana for family business so its going to set for a while (again:rofl:)
The one thing I want to check on is the shroud. Between space and the position of radiator to the fan its going to be very hard for a normal shroud to fit. Won't be able to buy one with a good shape to fit. So it's going to be hand made to fit the available room and seal it up for full flow. What is actually the question is the shape of the shroud. I can box it in mostly with the top curved to fit around fan to flow air to the fan using all the radiator fins and area. Will the square box on the corners going to mess up the flow?
Richard richie49
 

Darius

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No, the square box on the corners will NOT mess up the air flow.

Enjoy Montana. Its a lot cooler than South Texas this time of the year. - Hell, any time of the year!

bro. d
 

richie49

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Got delayed a bit,so heading out to montana on Sat or Sun.
I did get to do some on the corvair.Darn if I know it's good ,bad,lucky or unlucky? The radiator turned out o be somewhat too big. So I made a radiator mount to go under the radiator. Seeing its a little too tall I put the mount in but on a floor jack and raised it up and down till the radiator was a 1/2 inch from the hood. Home made play doah works great ,put it on all the areas that might hit and close hood. Then all you gotta do is measure what wasn't squised. So I carefully moved the radiator off the mount,not moving mount or jack.Marked everything and pulled mount drilled for holes ect..Put the dang thing in bolted it up, it looked good The mount was on the jack that wasn't MOVED!!!:crap: Put the radiator on it and the dam__ thing was 2 inchs off the hood:eek:o_O. Doesn't take much to imagine what was said! Thing is while I was saying bad words....:lipsaresealed: I looked at the shroud I had tried but was too tall too fit ,but now it fits under hood. I cleaned up some things and the shroud will work great,BUT the radiator is now lower than what I wanted. You can look at the pics and see how it looks. I dont like it that low but I'm going to see what it looks like after I put a heavy piece of angle iron in front of the radiator to protect it.I have a air dam that will hide it I hope. I believe I can hide it and protect it. Never bottoned out car so far so it should work:oops: t To be continued in July:(hopefully:rofl:
Richard richie49 P.S. any gaps will be closed in on the radiator and shroud.
 

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richie49

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While posting earlier I was looking at the bracket and how far down it was sitting. With the angle of the pic it looks somewhat low. So I went out and measured it from the bottom of the bracket to the ground. i have 10 inchs clearance. My springs wont compress that much. With bracing some angle iron in front of the radiator support to prevent damage from running into something ,I believe it will work out okay. Just got to try to make it look Okay.That will be when I get back.
Richard richie49
 

5one9

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Looks good Richard. I believe that you'll see positive results.
 

Cadillac Kid 1

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Richie,
Your fan blade has to come within about 1/4 inch of the opening otherwise it will just recirculate the air at the blade.I believe you said you are using a 17" fan. Looks like you are over an 18" opening.
Greg Surfas
 

richie49

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Greg
The opening is probably for a 20 inch blade. The largest I can go is the 17 inch before it hits the shroud that is VERY close to the hood.I was thinking of laying the shroud on a piece of sheet metal and draw a circle and cut it out and that will close the gap when I attach that to the shroud . Thanks for reminding me to put that on the list, Dang list is LARGE :rofl:.
Richard richie49
 
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