Why do I need cowl? - Page 3 - JeepForum.com
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post #31 of 51 Old 10-31-2012, 08:53 PM Thread Starter
vinnyabs
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Quote:
Originally Posted by Crazyray2929
I put a scoop on mine...
Doesn't keep ALL the water out but doesn't let alot in.
Like the looks of that! What brand and where did you get it?


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post #32 of 51 Old 10-31-2012, 09:32 PM
Crazyray2929
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I think it was a Rugged Ridge...(sorry I have short term memory loss)
I gave about $25 on buyitnowbay...
It's ABS plastic not metal but was better than I expected...
Fit was perfect.
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post #33 of 51 Old 10-31-2012, 10:46 PM
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Quote:
Originally Posted by John Strenk View Post
Another reason to run a cowl is to draw in dry air in the winter otherwise the windows not heated by the defrosters tend to fog up after a little while. Otherwise you are recirculating moist air inside the cab and when the moist air hits the cold windows, the water will collect on the cold surface.

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Does the air you speak of have to pass through the heater box to become dry air, or are you talking about just letting in some outside air through the passenger side lower vent?

Rich

'79 CJ5, AMC 360, t-18/d20 twin stick, dana 30/amc20(Mosers), Edelbrock Performer intake, Holley 600, ps/pb, DUI HEI, 'glass tub/1pc. tilt nose, 33x12.50 BFG AT's.

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post #34 of 51 Old 10-31-2012, 10:46 PM
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I removed mine and built an aluminum one to replace it .so you dont need one .But i removed the winshield also to lose wiegh so you dont need one of those either.
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post #35 of 51 Old 11-01-2012, 07:40 AM
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Quote:
Originally Posted by dunebum View Post
I removed mine and built an aluminum one to replace it .so you dont need one .But i removed the winshield also to lose wiegh so you dont need one of those either.
I take it that you've done the heater blower motor upgrade ...

Rich

'79 CJ5, AMC 360, t-18/d20 twin stick, dana 30/amc20(Mosers), Edelbrock Performer intake, Holley 600, ps/pb, DUI HEI, 'glass tub/1pc. tilt nose, 33x12.50 BFG AT's.

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post #36 of 51 Old 11-01-2012, 05:33 PM
John Strenk
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Quote:
Originally Posted by rixcj View Post
Does the air you speak of have to pass through the heater box to become dry air, or are you talking about just letting in some outside air through the passenger side lower vent?

Rich
Air outside is usually pretty dry in the winter.
Heating it dries it further.


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post #37 of 51 Old 11-01-2012, 05:49 PM
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Quote:
Originally Posted by John Strenk

Air outside is usually pretty dry in the winter.
Heating it dries it further.
Once the temperature drops below freezing, the air starts becoming drier, even to the point it can be to cold to snow. In Mintana I have seen ice on the roads disappear during the day when it is below zero. Just like your ice cubes shrink in a freezer.
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post #38 of 51 Old 11-01-2012, 06:44 PM
NOCHEEPGAS
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Well you definitely need a cowl! It gives your windshield a place to bolt to, and it nicely lines up the hood and fenders too. What you don't need is a cowl vent!
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post #39 of 51 Old 11-01-2012, 11:09 PM
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John Strenk says...

"Another reason to run a cowl is to draw in dry air in the winter otherwise the windows not heated by the defrosters tend to fog up after a little while. Otherwise you are recirculating moist air inside the cab and when the moist air hits the cold windows, the water will collect on the cold surface."

Quote:
Originally Posted by rixcj View Post
Does the air you speak of have to pass through the heater box to become dry air, or are you talking about just letting in some outside air through the passenger side lower vent?

Rich
Quote:
Originally Posted by John Strenk View Post
Air outside is usually pretty dry in the winter.
Heating it dries it further.
So..if all I would need is some of the cold, dry winter air to help with the defrosters, could I just open a window, a little?

I'm just trying to cover all my bases without having to have a cowl vent cutout in the 'glass tub. There's not one there, now.

Rich

'79 CJ5, AMC 360, t-18/d20 twin stick, dana 30/amc20(Mosers), Edelbrock Performer intake, Holley 600, ps/pb, DUI HEI, 'glass tub/1pc. tilt nose, 33x12.50 BFG AT's.

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post #40 of 51 Old 11-03-2012, 01:03 AM Thread Starter
vinnyabs
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Quote:
Originally Posted by NOCHEEPGAS
Well you definitely need a cowl! It gives your windshield a place to bolt to, and it nicely lines up the hood and fenders too. What you don't need is a cowl vent!
Touché!

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post #41 of 51 Old 11-03-2012, 03:27 AM
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Quote:
Originally Posted by rixcj View Post
John Strenk says...

"Another reason to run a cowl is to draw in dry air in the winter otherwise the windows not heated by the defrosters tend to fog up after a little while. Otherwise you are recirculating moist air inside the cab and when the moist air hits the cold windows, the water will collect on the cold surface."





So..if all I would need is some of the cold, dry winter air to help with the defrosters, could I just open a window, a little?

I'm just trying to cover all my bases without having to have a cowl vent cutout in the 'glass tub. There's not one there, now.

Rich
I've done that when I'm plowing snow, it does help when all the windows fog up. Even dry cold air seem to remove the the foggyness quicker than waiting for the whole car to warm up. But at higher speeds it tends to get a little uncomfortable.

I just realized I drive all my cars with the window cracked open a little. It just seems to stuffy for me if I don't maybe it's because I drove my drafty CJ for so long.


I had to modify my cowl vent when I converted over to a 84 Heater system. Did not enjoy it one bit becuase you have to be right on the money to get everything lined up. There are no flexable hoses to connect the cowl vent to the heater box. Fortunatly mistakes with fiberglass are easy to fix.


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post #42 of 51 Old 11-03-2012, 09:17 AM
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Thanks, John...

I'm going to chance NOT putting in the cowl vent. I have rebuilt my heater box, with a Blazer blower motor, and that thing puts out some serious hot air. I think I'll be OK.

If not, I'll go onto "Plan B".

Rich

'79 CJ5, AMC 360, t-18/d20 twin stick, dana 30/amc20(Mosers), Edelbrock Performer intake, Holley 600, ps/pb, DUI HEI, 'glass tub/1pc. tilt nose, 33x12.50 BFG AT's.

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post #43 of 51 Old 01-30-2013, 09:24 AM Thread Starter
vinnyabs
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image-3820942110.jpg

A little cut n grind, prime n paint, and rtv and my leaky fresh air duct is healed!
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post #44 of 51 Old 01-30-2013, 10:12 AM
John Strenk
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Look nice.

It would of been cool if you put a hinge on it with a rubber seal and it could pop up when you need some fresh air ajnd closed it would keep the water out....


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post #45 of 51 Old 01-30-2013, 10:50 AM
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Quote:
Originally Posted by John Strenk View Post
Look nice.

It would of been cool if you put a hinge on it with a rubber seal and it could pop up when you need some fresh air ajnd closed it would keep the water out....
It would be even cooler if it could be down with an electric servo so.
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