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Re: [GMCnet] WE ALL NEED MORE AIR [message #322118 is a reply to message #321873]

Mon, 14 August 2017 21:33

Messages: 1262
Registered: September 2009

Karma:

Senior Member

KB wrote on Wed, 09 August 2017 19:25

johnd01 wrote on Sat, 05 August 2017 19:36
Has anyone finished and tested this mod?

Just got my blower in the mail today and hope to try the mod in the next few days.

Karen
1975 26'

Well, not as good as I hoped. I chose to try abandoning the max air vent, so mounted the new blower
directly on the back of the AC box. I thought about mounting it further back and keeping the max air vent "snorkel",
but I didn't want that much protrusion into the cockpit. Without the max air slot open, it's basically the
same as the 73/74 box

We have an anemometer for measuring wind speed, so for lack of a better tool, I used that. All measurements
were taken with AC blower set to "high". The stock system with the max air vent closed got about 2 meters
per second (mps) out of the center dash vents. With the new blower, they got 3mps. The stock max air duct vents with
the oem blower got about 6mps, so double even the improved center vents. With no duct in front of the max air slot, it's 9+mps.

So, with the new blower, there was a definite improvement out of the center dash vents, though still nothing out of
the passenger side vent. However, it was nowhere near as good as the max air vent with the stock blower. There's also
the issue of the blower noise, though that could likely be improved upon with a baffle.

I think Mark Wall pretty well summed it up in his presentation, when he said
it wouldn't matter how much air you push through it, the oem (pre-77) ducts are the problem.
He did quite an interesting bunch of modifications, if you haven't seen them:
http://www.gmcmi.com/wp-content/uploads/2013/02/HVAC-Systems.pdf

FWIW, I was able to use the stock resistor pack with the new blower. Slightly easier
than modifying the wiring to use the new resistors, though that's not bad either.
The oem resistors are about half the ohms of the new pack.
Since I was only measuring "high", it didn't matter.

I'll probably play with this more later, but for now I'm out of time.
If I can get the heater core out, I think I could do Mark Wall's vent modifications
without removing the whole AC box.

Karen
1975 26'

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[Message index]

		[GMCnet] WE ALL NEED MORE AIR By: Thomas Pryor on Mon, 17 July 2017 09:55
		Re: [GMCnet] WE ALL NEED MORE AIR By: Emery Stora on Mon, 17 July 2017 10:17
		Re: [GMCnet] WE ALL NEED MORE AIR By: RF_Burns on Mon, 17 July 2017 10:43
		Re: [GMCnet] WE ALL NEED MORE AIR By: jhbridges on Mon, 17 July 2017 12:40
		Re: [GMCnet] WE ALL NEED MORE AIR By: Thomas Pryor on Mon, 17 July 2017 13:10
		Re: [GMCnet] WE ALL NEED MORE AIR By: Guy Lopes on Mon, 17 July 2017 14:20
		Re: [GMCnet] WE ALL NEED MORE AIR By: Emery Stora on Mon, 17 July 2017 14:45
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Wed, 02 August 2017 15:38
		Re: [GMCnet] WE ALL NEED MORE AIR By: lqqkatjon on Wed, 02 August 2017 16:21
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Wed, 02 August 2017 19:05
		Re: [GMCnet] WE ALL NEED MORE AIR By: johnd01 on Wed, 02 August 2017 19:09
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Wed, 02 August 2017 21:00
		Re: [GMCnet] WE ALL NEED MORE AIR By: jimk on Wed, 02 August 2017 21:42
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Wed, 02 August 2017 22:15
		Re: [GMCnet] WE ALL NEED MORE AIR By: jimk on Wed, 02 August 2017 22:26
		Re: [GMCnet] WE ALL NEED MORE AIR By: johnd01 on Wed, 02 August 2017 22:58
		Re: [GMCnet] WE ALL NEED MORE AIR By: USAussie on Wed, 02 August 2017 23:11
		Re: [GMCnet] WE ALL NEED MORE AIR By: johnd01 on Wed, 02 August 2017 23:27
		Re: [GMCnet] WE ALL NEED MORE AIR By: Keith V on Thu, 03 August 2017 08:54
		Re: [GMCnet] WE ALL NEED MORE AIR By: jimk on Thu, 03 August 2017 09:33
		Re: [GMCnet] WE ALL NEED MORE AIR By: johnd01 on Wed, 02 August 2017 22:25
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Thu, 03 August 2017 11:47
		Re: [GMCnet] WE ALL NEED MORE AIR By: johnd01 on Thu, 03 August 2017 12:11
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Thu, 03 August 2017 13:19
		Re: [GMCnet] WE ALL NEED MORE AIR By: johnd01 on Thu, 03 August 2017 13:47
		Re: [GMCnet] WE ALL NEED MORE AIR By: jimk on Thu, 03 August 2017 14:47
		Re: [GMCnet] WE ALL NEED MORE AIR By: jricke on Thu, 03 August 2017 16:45
		Re: [GMCnet] WE ALL NEED MORE AIR By: USAussie on Thu, 03 August 2017 16:55
		Re: [GMCnet] WE ALL NEED MORE AIR By: bhayes on Mon, 17 July 2017 14:45
		Re: [GMCnet] WE ALL NEED MORE AIR By: Sammy Williams on Mon, 17 July 2017 15:29
		Re: [GMCnet] WE ALL NEED MORE AIR By: powerjon on Mon, 17 July 2017 16:35
		Re: [GMCnet] WE ALL NEED MORE AIR By: powerjon on Mon, 17 July 2017 16:39
		Re: [GMCnet] WE ALL NEED MORE AIR By: USAussie on Mon, 17 July 2017 18:53
		Re: [GMCnet] WE ALL NEED MORE AIR By: jimk on Mon, 17 July 2017 20:53
		Re: [GMCnet] WE ALL NEED MORE AIR By: Bill Van Vlack on Tue, 18 July 2017 20:09
		Re: [GMCnet] WE ALL NEED MORE AIR By: Thomas Pryor on Wed, 19 July 2017 20:55
		Re: [GMCnet] WE ALL NEED MORE AIR By: Emery Stora on Wed, 19 July 2017 21:04
		Re: [GMCnet] WE ALL NEED MORE AIR By: Thomas Pryor on Thu, 20 July 2017 10:52
		Re: [GMCnet] WE ALL NEED MORE AIR By: Rob on Thu, 03 August 2017 13:36
		Re: [GMCnet] WE ALL NEED MORE AIR By: James Hupy on Thu, 03 August 2017 13:29
		Re: [GMCnet] WE ALL NEED MORE AIR By: Thomas Pryor on Thu, 03 August 2017 16:48
		Re: [GMCnet] WE ALL NEED MORE AIR By: USAussie on Thu, 03 August 2017 17:35
		Re: [GMCnet] WE ALL NEED MORE AIR By: Ken Henderson on Thu, 03 August 2017 18:23
		Re: [GMCnet] WE ALL NEED MORE AIR By: SpookyEng on Thu, 03 August 2017 18:54
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Thu, 03 August 2017 23:08
		Re: [GMCnet] WE ALL NEED MORE AIR By: tphipps on Fri, 04 August 2017 06:55
		Re: [GMCnet] WE ALL NEED MORE AIR By: Matt Colie on Fri, 04 August 2017 07:32
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Fri, 04 August 2017 16:53
		Re: [GMCnet] WE ALL NEED MORE AIR By: johnd01 on Sat, 05 August 2017 21:36
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Wed, 09 August 2017 21:25
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Mon, 14 August 2017 21:33
		Re: [GMCnet] WE ALL NEED MORE AIR By: lqqkatjon on Tue, 15 August 2017 09:06
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Tue, 15 August 2017 16:28
		Re: [GMCnet] WE ALL NEED MORE AIR By: USAussie on Thu, 03 August 2017 19:21
		Re: [GMCnet] WE ALL NEED MORE AIR By: Ken Henderson on Thu, 03 August 2017 20:02
		Re: [GMCnet] WE ALL NEED MORE AIR By: USAussie on Thu, 03 August 2017 20:12
		Re: [GMCnet] WE ALL NEED MORE AIR By: Ken Henderson on Thu, 03 August 2017 20:58
		Re: [GMCnet] WE ALL NEED MORE AIR By: johnd01 on Thu, 03 August 2017 20:29
		Re: [GMCnet] WE ALL NEED MORE AIR By: USAussie on Thu, 03 August 2017 20:41
		Re: [GMCnet] WE ALL NEED MORE AIR By: Thomas Pryor on Thu, 03 August 2017 20:51
		Re: [GMCnet] WE ALL NEED MORE AIR By: KB on Thu, 03 August 2017 23:05
		Re: [GMCnet] WE ALL NEED MORE AIR By: jhbridges on Tue, 15 August 2017 08:58

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