( Looked at Barb's issue. Now mine.) That air line is stock from GM. That size air line comes out of the discharge side of the compressor to a solenoid valve. About 6". Then a standard air line out of the solenoid valve to the air bags. These late GMC's also have no air tank. I've heard that some owners have replace the 2 stock compressors with 2 ViAir compressors. So why can't I put in the two stock, 2 cyl units that I now have? Or any simple ways to test these compressors. I have a total of 6 of the late compressor. Bob Dunahugh Late 78 Royale
Any idea why my late 78 compressor discharge line is so tiny? .125 OD, .075 ID. REALLY.
- Thread starter Bob Dunahugh
- Start date
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Bob:
Call Dave Marchiando w/ your air compressor questions.
He is very knowledgeable and helpful. He also rebuilds/refurbishes the original compressors installed by GM.
Mike/The Corvair a holic
Sent from my iPhone
>
> ( Looked at Barb's issue. Now mine.) That air line is stock from GM. That size air line comes out of the discharge side of the compressor to a solenoid valve. About 6". Then a standard air line out of the solenoid valve to the air bags. These late GMC's also have no air tank. I've heard that some owners have replace the 2 stock compressors with 2 ViAir compressors. So why can't I put in the two stock, 2 cyl units that I now have? Or any simple ways to test these compressors. I have a total of 6 of the late compressor. Bob Dunahugh Late 78 Royale
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Call Dave Marchiando w/ your air compressor questions.
He is very knowledgeable and helpful. He also rebuilds/refurbishes the original compressors installed by GM.
Mike/The Corvair a holic
Sent from my iPhone
>
> ( Looked at Barb's issue. Now mine.) That air line is stock from GM. That size air line comes out of the discharge side of the compressor to a solenoid valve. About 6". Then a standard air line out of the solenoid valve to the air bags. These late GMC's also have no air tank. I've heard that some owners have replace the 2 stock compressors with 2 ViAir compressors. So why can't I put in the two stock, 2 cyl units that I now have? Or any simple ways to test these compressors. I have a total of 6 of the late compressor. Bob Dunahugh Late 78 Royale
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> Bob:
> Call Dave Marchiando w/ your air compressor questions.
Link?
> He is very knowledgeable and helpful. He also rebuilds/refurbishes the
> original compressors installed by GM.
> Mike/The Corvair a holic
>
> Sent from my iPhone
>
> >
> > ( Looked at Barb's issue. Now mine.) That air line is stock from GM.
> That size air line comes out of the discharge side of the compressor to a
> solenoid valve. About 6". Then a standard air line out of the solenoid
> valve to the air bags. These late GMC's also have no air tank. I've heard
> that some owners have replace the 2 stock compressors with 2 ViAir
> compressors. So why can't I put in the two stock, 2 cyl units that I now
> have? Or any simple ways to test these compressors. I have a total of 6 of
> the late compressor. Bob Dunahugh Late 78 Royale
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://bdub.net/gmcmotorhome.info/
Alternator Protection Cable
http://bdub.net/gmcmotorhome.info/APC.html
> Call Dave Marchiando w/ your air compressor questions.
Link?
> He is very knowledgeable and helpful. He also rebuilds/refurbishes the
> original compressors installed by GM.
> Mike/The Corvair a holic
>
> Sent from my iPhone
>
> >
> > ( Looked at Barb's issue. Now mine.) That air line is stock from GM.
> That size air line comes out of the discharge side of the compressor to a
> solenoid valve. About 6". Then a standard air line out of the solenoid
> valve to the air bags. These late GMC's also have no air tank. I've heard
> that some owners have replace the 2 stock compressors with 2 ViAir
> compressors. So why can't I put in the two stock, 2 cyl units that I now
> have? Or any simple ways to test these compressors. I have a total of 6 of
> the late compressor. Bob Dunahugh Late 78 Royale
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://bdub.net/gmcmotorhome.info/
Alternator Protection Cable
http://bdub.net/gmcmotorhome.info/APC.html
The lines are that size because that is what GM was using in the cars those units were designed for. No idea why they designed THOSE that way!
Those two compressors also incorporate the exhaust valves. If they are replaced, an exhaust valve for each side will need to be added. This change,
or some other system, such as the wireless system, may be desirable, as those compressor/exhaust valve units are getting VERY expensive.
I have added those exhaust valves and installed Viair compressors on the 78 stretch. It goes up & down quickly! I considered a wireless system, but
it's so heavy it needs more than 100psi to achieve full raise.
--
John Shutzbaugh, Vacaville, CA;
77 Eleganza, bought it new, can't blame PO, and
78 Buskirk stretch, "What were we thinking?"
Those two compressors also incorporate the exhaust valves. If they are replaced, an exhaust valve for each side will need to be added. This change,
or some other system, such as the wireless system, may be desirable, as those compressor/exhaust valve units are getting VERY expensive.
I have added those exhaust valves and installed Viair compressors on the 78 stretch. It goes up & down quickly! I considered a wireless system, but
it's so heavy it needs more than 100psi to achieve full raise.
--
John Shutzbaugh, Vacaville, CA;
77 Eleganza, bought it new, can't blame PO, and
78 Buskirk stretch, "What were we thinking?"
John,
If you're still using the OEM style air bags, you should consider going to
the Sully Bag system. If using one of the 4-bagger systems,
contact the bag manufacturer for a possibly higher capacity bag. Fatter
bags will let you carry the weight at a lower pressure, saving
you from problems caused by the higher pressure. At least, that's my honest
opinion.
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "John Shutzbaugh"
Sent: Saturday, April 29, 2017 10:20 AM
To:
Subject: Re: [GMCnet] Any idea why my late 78 compressor discharge line is
so tiny? .125 OD, .075 ID. REALLY.
> The lines are that size because that is what GM was using in the cars
> those units were designed for. No idea why they designed THOSE that way!
>
> Those two compressors also incorporate the exhaust valves. If they are
> replaced, an exhaust valve for each side will need to be added. This
> change,
> or some other system, such as the wireless system, may be desirable, as
> those compressor/exhaust valve units are getting VERY expensive.
>
> I have added those exhaust valves and installed Viair compressors on the
> 78 stretch. It goes up & down quickly! I considered a wireless system,
> but
> it's so heavy it needs more than 100psi to achieve full raise.
> --
> John Shutzbaugh, Vacaville, CA;
> 77 Eleganza, bought it new, can't blame PO, and
> 78 Buskirk stretch, "What were we thinking?"
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
If you're still using the OEM style air bags, you should consider going to
the Sully Bag system. If using one of the 4-bagger systems,
contact the bag manufacturer for a possibly higher capacity bag. Fatter
bags will let you carry the weight at a lower pressure, saving
you from problems caused by the higher pressure. At least, that's my honest
opinion.
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "John Shutzbaugh"
Sent: Saturday, April 29, 2017 10:20 AM
To:
Subject: Re: [GMCnet] Any idea why my late 78 compressor discharge line is
so tiny? .125 OD, .075 ID. REALLY.
> The lines are that size because that is what GM was using in the cars
> those units were designed for. No idea why they designed THOSE that way!
>
> Those two compressors also incorporate the exhaust valves. If they are
> replaced, an exhaust valve for each side will need to be added. This
> change,
> or some other system, such as the wireless system, may be desirable, as
> those compressor/exhaust valve units are getting VERY expensive.
>
> I have added those exhaust valves and installed Viair compressors on the
> 78 stretch. It goes up & down quickly! I considered a wireless system,
> but
> it's so heavy it needs more than 100psi to achieve full raise.
> --
> John Shutzbaugh, Vacaville, CA;
> 77 Eleganza, bought it new, can't blame PO, and
> 78 Buskirk stretch, "What were we thinking?"
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Thanks for the input, Gary,
I have considered the Sully bag system & have corresponded with Sully about the heavy stretch. He has reassured me that the bags are more than up to
carrying the extra weight, and as you have pointed out, will do so at a significantly lower pressure.
The only reason I haven't changed is that the Sully bags allow almost an inch less height on full raise (and don't go down quite as far). Campground
leveling is important to me. I have been trying to keep track of how many times we have needed full raise lately. Maybe I can make a decision based
on that. Or carry more Winnebago blocks!
--
John Shutzbaugh, Vacaville, CA;
77 Eleganza, bought it new, can't blame PO, and
78 Buskirk stretch, "What were we thinking?"
I have considered the Sully bag system & have corresponded with Sully about the heavy stretch. He has reassured me that the bags are more than up to
carrying the extra weight, and as you have pointed out, will do so at a significantly lower pressure.
The only reason I haven't changed is that the Sully bags allow almost an inch less height on full raise (and don't go down quite as far). Campground
leveling is important to me. I have been trying to keep track of how many times we have needed full raise lately. Maybe I can make a decision based
on that. Or carry more Winnebago blocks!
--
John Shutzbaugh, Vacaville, CA;
77 Eleganza, bought it new, can't blame PO, and
78 Buskirk stretch, "What were we thinking?"
John,
I have Sully's airbags and I had the same concern but per Sully's data on his website his bags are only off a 1/4" up and 1/2" down from the OEM
height, which sealed the deal for me.
Jon
https://docs.google.com/spreadsheets/d/1GiUiGAgnW4WPnjbnkfe5vDPELhU4A0lHt7qGRXAbC1Q/edit?hl=en_US&hl=en_US=0
http://www.bdub.net/sully/
--
Jon Payne
76 Palm Beach
Westfield,IN
I have Sully's airbags and I had the same concern but per Sully's data on his website his bags are only off a 1/4" up and 1/2" down from the OEM
height, which sealed the deal for me.
Jon
https://docs.google.com/spreadsheets/d/1GiUiGAgnW4WPnjbnkfe5vDPELhU4A0lHt7qGRXAbC1Q/edit?hl=en_US&hl=en_US=0
http://www.bdub.net/sully/
--
Jon Payne
76 Palm Beach
Westfield,IN
Jon...Thanks, you are absolutely correct. I reviewed my correspondence with Sully and it appears that I misinterpreted and or mis-remembered the
specs on the Sully System. Maybe I won't need so many Winnebago blocks.
--
John Shutzbaugh, Vacaville, CA;
77 Eleganza, bought it new, can't blame PO, and
78 Buskirk stretch, "What were we thinking?"
specs on the Sully System. Maybe I won't need so many Winnebago blocks.
--
John Shutzbaugh, Vacaville, CA;
77 Eleganza, bought it new, can't blame PO, and
78 Buskirk stretch, "What were we thinking?"
Also, Sorry to all. Looks like I did some thread hijacking. Will be more careful in the future.
--
John Shutzbaugh, Vacaville, CA;
77 Eleganza, bought it new, can't blame PO, and
78 Buskirk stretch, "What were we thinking?"
--
John Shutzbaugh, Vacaville, CA;
77 Eleganza, bought it new, can't blame PO, and
78 Buskirk stretch, "What were we thinking?"
I have found that the slight reduction in full raise is easily overcome by
taking a few extra minutes when selecting my final camp spot in order to
set the front wheels in a position where the front is slightly low compared
to the rear then drop the rear to make it level. This also lowers the entry
step making ingress and egress much more ergonomic. I almost never camp on
asphalt.
Sully
77 eleganza 2
Seattle
On Sat, Apr 29, 2017 at 10:46 AM John Shutzbaugh
wrote:
> Also, Sorry to all. Looks like I did some thread hijacking. Will be more
> careful in the future.
> --
> John Shutzbaugh, Vacaville, CA;
> 77 Eleganza, bought it new, can't blame PO, and
> 78 Buskirk stretch, "What were we thinking?"
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
taking a few extra minutes when selecting my final camp spot in order to
set the front wheels in a position where the front is slightly low compared
to the rear then drop the rear to make it level. This also lowers the entry
step making ingress and egress much more ergonomic. I almost never camp on
asphalt.
Sully
77 eleganza 2
Seattle
On Sat, Apr 29, 2017 at 10:46 AM John Shutzbaugh
wrote:
> Also, Sorry to all. Looks like I did some thread hijacking. Will be more
> careful in the future.
> --
> John Shutzbaugh, Vacaville, CA;
> 77 Eleganza, bought it new, can't blame PO, and
> 78 Buskirk stretch, "What were we thinking?"
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
