Horizontal Fans, Again, sorry... Options

[VaccaRabite]

Also, make sure that what ever you do leaves you with the ability to run an alternator. Chris's version does not, and I don't think that I see one in the yellow car with the blue engine.

Great for a race car, not so great for a street car.

Zach

[r_towle]

Also, make sure that what ever you do leaves you with the ability to run an alternator. Chris's version does not, and I don't think that I see one in the yellow car with the blue engine.

Great for a race car, not so great for a street car.

Zach

I thought the fan was mounted on an alternator...like a 911.

Rich

[ClayPerrine]

Also, make sure that what ever you do leaves you with the ability to run an alternator. Chris's version does not, and I don't think that I see one in the yellow car with the blue engine.

Great for a race car, not so great for a street car.

Zach

I thought the fan was mounted on an alternator...like a 911.

Rich

Nope.. a Corvair had the alternator mounted sideways as one of the idler pulleys used to change the belt direction by 90 degrees.

[Rod]

Thanks for all the help and information so far. I don't think there is an off-the-shelf horizontal cooling system that is what I'm after at the moment. The 911 fans are not the correct type of fan for horizontal application as they don't create enough pressure. I don't like the look of the fan belt bending all the way over the top in both the corvair and the reichert set ups, so this demands more thought.

I do think that a good horizontal kit would be a good seller though... with correct internal ducting, provision for an alt and a 90 degree mechanical connection to the fan straight through the alternator itself would be ideal in my mind..

[lotus_65]

it does look cool... i think of these (IMG:style_emoticons/default/wub.gif)

but for a streeter, the engineerings already done with jakes dtm setup. that's pretty far up the cool ladder imo-

[ChrisFoley]

Thanks for all the help and information so far. I don't think there is an off-the-shelf horizontal cooling system that is what I'm after at the moment. The 911 fans are not the correct type of fan for horizontal application as they don't create enough pressure. I don't like the look of the fan belt bending all the way over the top in both the corvair and the reichert set ups, so this demands more thought.

I do think that a good horizontal kit would be a good seller though... with correct internal ducting, provision for an alt and a 90 degree mechanical connection to the fan straight through the alternator itself would be ideal in my mind..

My system was supposed to be available by now, including an alternator - but I haven't found time or $$ to finish the development. The original (Jay Putnam) design of the shroud doesn't meet my standards.
I use NAPA belts and have not had a problem - since I made sure the pulleys are properly matched to the belt shape.
I'm very happy with the way it works in my race car.

[VaccaRabite]

I thought the fan was mounted on an alternator...like a 911.
Rich

Nope.. a Corvair had the alternator mounted sideways as one of the idler pulleys used to change the belt direction by 90 degrees.

Yup.
This is how it looks (using Mike's engine as a model)
(IMG:http://farm3.static.flickr.com/2602/3721481847_bbca8ae2aa.jpg)

The alternator sits as one of the 90 degree bends for the belt. This would not be hard to do for a 914. Chris does not have one due to his race rules (can't move alternator position if you have one.)

Zach

[Rod]

I thought the fan was mounted on an alternator...like a 911.
Rich

Nope.. a Corvair had the alternator mounted sideways as one of the idler pulleys used to change the belt direction by 90 degrees.

Yup.
This is how it looks (using Mike's engine as a model)
(IMG:http://farm3.static.flickr.com/2602/3721481847_bbca8ae2aa.jpg)

The alternator sits as one of the 90 degree bends for the belt. This would not be hard to do for a 914. Chris does not have one due to his race rules (can't move alternator position if you have one.)

Zach

Doing it that way it would be easy to integrate the tensioner onto the same bracket as the alternator to stop the belt from jumping off too..

[ChrisFoley]

That Corvair alternator location doesn't work with our engines due to distributor placement.
My plan would be to keep the stock alternator location and run a separate belt.

[VaccaRabite]

That Corvair alternator location doesn't work with our engines due to distributor placement.
My plan would be to keep the stock alternator location and run a separate belt.

Why not just put it on the non-distributor side?

Its a little fabrication either way, but using one belt is easier then using two.

Zach

[DBCooper]

The 911 fans are not the correct type of fan for horizontal application as they don't create enough pressure.

Air's a fluid, it won't make any difference if it's being pushed horizontally or vertically.

[Dr Evil]

I think the sprung tensioner you were referring to is this one:
http://www.corvair.com/user-cgi/catalog.cg...AIN&page=15

They were never stock and this one is $109.

As for the fan, notice that mine has practically vertical fins. This was a change in 65 as the older fans, more like the squirrel cage, supposedly cooled too much. I find it interesting that a 2.7L 6cyl engine only needed a vertically bladed fan to keep it cool.

[Dr Evil]

More info from one of the vair forums:

"Buy a Clarks belt and be sure not to over tighten it. A properly adjusted belt should allow you to turn the Alt or Gen fan with 2 fingers; if you can't turn the fan with 2 fingers it's too tight. Also correct alignment and clean rust free pulley surfaces are crucial to belt life."

Located here for more info:
http://corvaircenter.com/phorum/read.php?1,232721,233005

[zymurgist]

I find it interesting that a 2.7L 6cyl engine only needed a vertically bladed fan to keep it cool.

Didn't the 2.7's have cooling issues? (IMG:style_emoticons/default/wink.gif)

Yeah, I know, self-inflicted... Porsche intentionally made the engines run hot (5 blade fan) in order to make the thermal reactor work.

[turboman808]

Yup.
This is how it looks (using Mike's engine as a model)
(IMG:http://farm3.static.flickr.com/2602/3721481847_bbca8ae2aa.jpg)

The alternator sits as one of the 90 degree bends for the belt. This would not be hard to do for a 914. Chris does not have one due to his race rules (can't move alternator position if you have one.)

Zach

Thats a hell of a cool setup. Love to have something like that in my car.

[Dr Evil]

I find it interesting that a 2.7L 6cyl engine only needed a vertically bladed fan to keep it cool.

Didn't the 2.7's have cooling issues? (IMG:style_emoticons/default/wink.gif)

Yeah, I know, self-inflicted... Porsche intentionally made the engines run hot (5 blade fan) in order to make the thermal reactor work.

Let me clarify, all corvair engines were 2.7L from 65-69 no matter the HP. They changed number of carbs, size of valves, but the displacement stayed the same. The fan you see on my engine was what they also switched to. It has fan blades with no discernible pitch to them. Before this the fans had blades like our squirrel cages.

[904svo]

I like a vertical setup better, this is my version.

[Maltese Falcon]

Downward airflow, and its equally channeled ducting, is key to providing all 6 (or 4) barrels equally supplied with large doses of cooling air . The vertical fan does a decent job, but the last 2 rear (L and R) cylinders are slightly robbed of airflow. In a 12 or 24 hour endurance race this could spell a DNF, henceforth the horizontal cooling delivery. It delivers LOTS of equally directed airflow, but at the cost of parasitic HP loss due to its being driven by the crank. The n/a or later turbo'd flat fan engines made no fuss about the hp loss--the Porsche aircooled victories (for decades) speak for themselves. Here's some data from Olaf Lang @ Porsche customer service.
The ear candy isn't bad either (IMG:style_emoticons/default/smile.gif)
Marty

[Maltese Falcon]

This is how the belt tensioner is situated on the 935 H- fan set up. I have a removeable section at the bulkhead to access all of this stuff from the cabin. This hatch is handy when doing the valve adjustments, I have all of the timing, Z1 and valve adjusting marks on the front crank serpentine pulley.
Marty

[mskala]

Downward airflow, and its equally channeled ducting, is key to providing all 6 (or 4) barrels equally supplied with large doses of cooling air . The vertical fan does a decent job, but the last 2 rear (L and R) cylinders are slightly robbed of airflow. In a 12 or 24 hour endurance race this could spell a DNF, henceforth the horizontal cooling delivery. It delivers LOTS of equally directed airflow, but at the cost of parasitic HP loss due to its being driven by the crank. The n/a or later turbo'd flat fan engines made no fuss about the hp loss--the Porsche aircooled victories (for decades) speak for themselves. Here's some data from Olaf Lang @ Porsche customer service.
The ear candy isn't bad either (IMG:style_emoticons/default/smile.gif)
Marty

The engine RPM and fan RPM don't match linearly. (IMG:style_emoticons/default/confused24.gif)

I hope they don't have that much slip.