Mirrors, revisited

[wrath]

You got it up to 98????

Copilot yells if their phone's GPS says triple digits. I can tell you from my own phone it will go 104. It's kind of white knuckle in the triple digit speeds. Tire squeals at every seam in the concrete/tire bounce and a crosswind makes it a bit of a handful. Cruises nice at 80. At 90 you have to pay attention. Engine spins 2400 at 65. Usually set the cruise at either 63 or 77. Fuel consumption is atrocious above 63mph. Like less than 10mpg.

 

[6cuda6]

If cracking a window helps...did you try cracking a vent open? maybe that might be the only real solution other then sending them back and rolling your own?

 

[LQQKatJon]

The shape of the mirror between a Ramco and a pancake farmtruck mirror from the 70s... not even close. The Ramco is significantly larger and four times the depth. It is marginally closer to the body, but mostly because it is wider. The Ramco arm is also comparatively large with regard to the fact that the factory arm is a piece of 3/4" round bar stuck to a piece of stamped steel.

I suspect the "aerodynamic" nature of the mirror is causing the problem. If it were ugly and flat I bet there is enough air disturbance to cause a wash that it doesn't happen.

The part that has my attention is that no one else has had this problem. If I spent $480 for a set of mirrors I'm going to hassle with then why didn't I just build some arms out of stainless and slap on a cheap pair of Velvac fleabay mirrors for $50? I was trying to buy myself out of a time vampire.

I'm wondering if all the time I've spent trying to seal up the interior and the modifications related to the front has caused me all of this grief. If I open a window inside (preferably the one in front of the door) the problem goes away.

Never heard of a problem with the ramco mirrors. There used to be another shape (2 options) of ramco’s years ago when many were buying them. More square, but most I think bought the more rounded ones that I believe are same today.

the gmc arm ramco’s are not the same arms as the ebay ones. They told me to call direct, and I have not. I am guessing they are much more then the $259 ebay ones.
I will look into it at a future date. Best I dont know actual cost. $300 for a set of mirrors with no options is expensive but I could probably justify that. I have drivem coach’s with ramco’s and it is nice to see the rear tires. But $500+ I cant justify.

the gmc arm ramco’s are not the same arms as the ebay ones. They told me to call direct, and I have not. I am guessing they are much more then the $259 ebay ones.

it probably is how well you sealed your coach. 99%
of
Coaches have air leaks front to back.

 

[wrath]

I believe the bolt pattern on the GMC mirror base is 2.5" tall by 3.125" wide but I forget. The eBay mirrors have a different pattern machined into them but I don't remember what it is. It's the common Class A pattern.

There is nothing special about the arms other than they look more modern and they have the proper pattern machined into them. It's not like they're at the proper angle for the side of the GMC or anything.

I should have bought cheap Velvac Deluxe mirrors ($100 each head, half that used) and made new bases. At least I'd have cheap buffeting!

I've been experimenting with leaving the fans open.

The AC/heater disaster (and the dash as a whole) is the last project. I'm not sure I want to deal with it right now. It will probably snowball like everything else. GMC had a great design for everything else... and then it looks like they used the cheapest components and the laziest way of doing everything in front of the doghouse. Most anything plastic in front of the driver's seat is broken to pieces. I wonder if I play with the heater box of garbage if that will impact the buffeting also.