BAC Forum

General Boards => General Discussion => Topic started by: Jon Hubbell on December 13, 2020, 02:08:12 AM

Title: Clean Air
Post by: Jon Hubbell on December 13, 2020, 02:08:12 AM
Is the air from the turbo charger on my Monterey clean enough to use to blow out the water lines for winterization?
Title: Re: Clean Air
Post by: Eric Maclean on December 13, 2020, 02:57:48 AM
Jon
Even if it was at idle you won't have enough boost to do the job .
Your going to need better than 20 psi and the only way to get that from the turbo is under load at highway speeds.

Typically at idle you'll get 2 to 3 pounds max and maybe 8 to 10 at WOT ( wide open throttle) in neutral no load.
And loading the engine against the brakes is a no no as it quickly over heats the transmission torque converter.
Sorry to dash your hopes.
Eric
Title: Re: Clean Air
Post by: Bob Stone on December 13, 2020, 07:46:11 AM
Do you not have an air chuck in the rear passenger side beside the condensation blow out valves?

Title: Re: Clean Air
Post by: Bill Sprague on December 14, 2020, 02:35:23 PM
Do not use the blow out method in a Hydro/AquaHot equipped motorhome.  The risk is that, no matter what source of compressed air you use, there may not be enough volume and pressure to completely clear the fresh water coils.  If some remains it will drain and collect in the bottom of the coils.  If it then freezes, the repair price will take your breath away. 

You can use compressed air for the rest of the system, but after the blow out, you need to run RV antifreeze through the HydroHot.   And, if you have a Splendide, you can't blow that out either. 
Title: Re: Clean Air
Post by: Jon Hubbell on December 15, 2020, 03:19:28 AM
First:  I do not have an aqua-hot system - it is a gas furnace.
Second:  I do have an outlet on the street side at the rear.  It is sufficient to keep my tires at 100 psi, so why would it not be sufficient to blow out the water system with a pressure regulator to not over pressurize the system?
Title: Re: Clean Air
Post by: Jon Hubbell on December 15, 2020, 03:28:25 AM
I know I have sufficient pressure - what I don't want to do is fill my water system with wet, oily water in addition to air.  Is that outlet clean air?  If not, am I potentially damaging my tires?  I have used it for 18 years on my motorhome and similar application for semi-trucks for years before that.
Title: Re: Clean Air
Post by: Dave Atherton on December 15, 2020, 05:16:24 AM
Gentleman, may Isuggest lets not get off track on operation of engine Turbo Charger. First of
all looking at a turbo charger a person will see one side of turbo with a rubber tube connected
to the engine air filter and to center of the compressor or cold side of turbo. Than you will notice a smaller rubber boot connected to piping that is connected the the charged air to air cooler and
exit piping enters the engine. What’s drives the turbo charger is the engine exhaust. As the
Turbo charger spins under load it is packing more air into the engine and more diesel fuel to the
engine injectors. The turbo charger turns twice then speed of the engine rpms. Where Dave is going
with above information ( the compressed air leaving the turbo charger around 330 deg F to 400
Deg F and goes through the engine CAC and enters the engine around 110 deg F ). The cool dense
Air entering engine intake provides increased power and better fuel milage. Very important point
That I cannot over state ( the piping off the compressor side or cold side of turbo, cannot allow
any air in any way through the CAC to intake of engine ). In closing do not think about breaking into a closed loop system meaning the turbo charger. It will not work along with detune and power loss will
occur within engine.  Dave Atherton Retired Cat Mechanic
Title: Re: Clean Air
Post by: William Jordan on December 15, 2020, 11:51:25 AM
Jon the air coupling you are talking about is not off the turbo charger.  I believe , its off the engine air compressor for brakes and suspension.  The fitting I believe your talking about should come after the air dryer so the air (provided the air dryer has been serviced ) will be dry. Simple answer, Yes you can use that air to blow out the water lines, fill tires etc.
Title: Re: Clean Air
Post by: Bill Sprague on December 15, 2020, 03:19:06 PM
Sorry that I assumed you had a HydroHot.  I agree that it can be blown out with air coming from the air brake system fitting.  If I was worried about oil in that air I would buy one of the inexpensive compressor filters at Home Depot or similar.

The first example I found on Amazon is about $12.  There may be better. 

https://smile.amazon.com/NANPU-Compressed-Filter-Element-Barcket/dp/B082SMLYR8/ref=redir_mobile_desktop?ie=UTF8&aaxitk=Zez9-ZxV25Kum5Xzg2owTA&hsa_cr_id=9492085040301&ref_=sbx_be_s_sparkle_mcd_asin_1

Title: Re: Clean Air
Post by: Jon Hubbell on December 18, 2020, 04:28:18 AM
Thank you all that replied.  It has been helpful and I learned a lot.  I feel like I can safely now winterize my motorhome.
Title: Re: Clean Air
Post by: Bill Sprague on December 20, 2020, 05:39:56 AM
Jon,

I think we might be neighbors at Panorama!  Let me know if I can help.

Bill