| Dana performance question [message #215123] |
Sat, 20 July 2013 11:11  |
An87ttype
Messages: 157
Registered: September 2012
Karma: 0
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Senior Member |
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I have finally gotten around rebuilding the Dana. New heads and pistons etc. from JimK. all in all it looked pretty good. No big scrapes, but one side was a bit tighter than the other. I timed it one up and one down. How critical is that setting. It could be off by a tooth or two.
To fill just the tank it takes over 4 minutes from 90 to 120 and it really struggles to the point of blowing the fuse if I let it go over 5 or 6 minutes. One side is hotter than the other and seems to relate to the tighter fitting piston. However, they both do move smoothly.It just seems like it can't handle the pressure.
Thanks all! I'm curious to hear how well these things should really work.
1975 Eleganza II
Hudson Valley NY
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| Re: [GMCnet] Dana performance question [message #215126 is a reply to message #215123] |
Sat, 20 July 2013 11:52  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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The Dana v twin is not a continuous duty cycle compressor. It will get hot
to the touch when working. The new Viair continuous duty cycle compressor
will pump to 200 psi in the time the Dana takes to reach 125. If your
entire Gmc air system is leak free, (not very likely) the Dana is adequate
for the job. The real task is to maintain the system of lines, height
valves, tanks, pressure switch, and compressor in good condition so you
will not have to overwork the Dana.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Jul 20, 2013 9:11 AM, "Daryn" <An87ttype@hotmail.com> wrote:
>
>
> I have finally gotten around rebuilding the Dana. New heads and pistons
> etc. from JimK. all in all it looked pretty good. No big scrapes, but one
> side was a bit tighter than the other. I timed it one up and one down. How
> critical is that setting. It could be off by a tooth or two.
> To fill just the tank it takes over 4 minutes from 90 to 120 and it really
> struggles to the point of blowing the fuse if I let it go over 5 or 6
> minutes. One side is hotter than the other and seems to relate to the
> tighter fitting piston. However, they both do move smoothly.It just seems
> like it can't handle the pressure.
> Thanks all! I'm curious to hear how well these things should really work.
> --
> 1975 Eleganza II
> Hudson Valley NY
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: Dana performance question [message #215194 is a reply to message #215123] |
Sun, 21 July 2013 07:12 |
An87ttype
Messages: 157
Registered: September 2012
Karma: 0
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Senior Member |
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What is the performance of the Viair? How long would it take to fill the tank for instance? My Dana will take at least 4 minutes to refill the tank from 90 to120. And it will be hot as hell too. Would the Viair be much faster?
I like the idea of using the Dana, but if this is normal performance, I think I would consider something else if it's better. I was really hoping for much better performance after rebuilding. That is why I think I must have done something wrong. How critical is the timing? Will a few teeth off make much of a difference?
I don't want to spend a lot of time fixing something that isn't broke. What I have might actually be normal operation. I just don't have a good point of reference. It just seems like it should be performing better. Please let me know how yours are all working so I can decide whether or not to fix it or junk it...Many Thanks
1975 Eleganza II
Hudson Valley NY
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| Re: Dana performance question [message #215846 is a reply to message #215123] |
Fri, 26 July 2013 22:58 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| An87ttype wrote on Sat, 20 July 2013 09:11 |
I have finally gotten around rebuilding the Dana. New heads and pistons etc. from JimK. all in all it looked pretty good. No big scrapes, but one side was a bit tighter than the other. I timed it one up and one down. How critical is that setting. It could be off by a tooth or two.
To fill just the tank it takes over 4 minutes from 90 to 120 and it really struggles to the point of blowing the fuse if I let it go over 5 or 6 minutes.
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I finally got out to the coach and started my pump. It is a rebuilt unit Dana from JimK. I have a '74 coach with about a 1 gallon tank in the lower right front of the GMC. I have never felt it to see how hot the pump gets but it has never blown a fuse.
The coach had been sitting for about three weeks. The bags hold now that I have a JR Slaten set of valves but the tank bleeds down, so I assume it was down to nothing.
It took right on 5 minutes to pump the tank to the cutoff point.
I will add that now that I have Sully type bags which run with much less pressure, I can start to raise the coach way before cutoff. If the tank is full, she comes up very quickly.
Hope this helps.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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