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Old 06-06-2018, 12:44 AM   #1181
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I believe temp doesn't become critical until it boils. Water boils at 212įf. You gain 3į for every lb of pressure you can build before the cap releases. A 15lb cap should get you to near 250į before you boil, boiling water is poor at transferring heat. 210 is nothing to be concerned with. Chris, I hear you on the oil temps being higher than water. When I added an oil temp gauge in my race car I was asked " Why do you want this in there, all it's going to do is scare the **** out of you when you see how high it is." I said I realize that and I'm not interested in the number, only interested in knowing when that number changes.
During the heat of battle it was not uncommon for the water to be 200 and the oil 340, yikes.

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Old 06-06-2018, 09:25 AM   #1182
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Bus started better this AM. It did stumble once, but then kicked back in. A few dots are connecting.

It took it a few seconds to build oil pressure, and I think that may be why it cut out.

Once there was oil pressure it built to 40 psi at idle over a few seconds.

Itís weird. When running oil pressure is fine. I know that is because the pump is spinning faster, but just a small rpm difference seems to make a big psi difference.

I wonder if the sender is accurate.
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Old 06-06-2018, 09:49 AM   #1183
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oil pumps are gear type pumps... when oil is cooler it is quite thick.. so when you first start up.. the pressure builds and holds high at idle.. the pump can move more of it and less of it is flowing and draining through the bearings because its thick.. result high pressure.. in fact when an engine is cold, there is a relief spring that will bleed oil off straight back to the pan because the pressure might go too high otherwise..



when the engine is hot, that oil is thin.. more oil can "leak" (not on the ground) around the pump gears.. more flows through the bearings. so when the engine spins slow the pump doesnt move enough to make those higher pressures. spin the engine faster and the pump speeds up (its either driven by your crank or cam.. i dont know that engine's oil circuit.. ). and thus more pressure..



your jeep likely does the same thing.. but honestly the consumer cars have "tempered" gauges.. they typically arent what they really say they are.. for instance the Oil P on my RAM Hemi truck drops to 33 when its really hot out and I idle it.. when I punch it.. goes right up to 65 at higher RPM.. but the dash gauge goes just barely below 1/2 scale at idle and then just barely above 1/2 scale at full speed.. they dont want to alarm people who see the gauge go all over..



commercial vehicles are designed to show you the real deal... gauges move up and down because the pressures and temperatures do..
-Christopher
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Old 06-06-2018, 03:13 PM   #1184
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Was in the middle of nowhere and couldnít get more oil until driving to El Paso. Cruising oil pressure was around 25-30psi after warming up fully.

Made it ok, but wow Guadalupe pass was pretty exciting!

Finally got to put more oil in.

Iím stupid. ďNot that lowĒ was 2 gallons low.

Put in heavy diesel Mobil 1.
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Old 06-06-2018, 03:26 PM   #1185
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IDK about Cats but I'd be running a 15w40.

Here's the Cat literature about fluids-
https://www.allmand.com/content/dam/...ifications.pdf

I'd be real keen on keeping it full of the proper oil at all times.
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Old 06-06-2018, 05:12 PM   #1186
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IDK about Cats but I'd be running a 15w40.

Here's the Cat literature about fluids-
https://www.allmand.com/content/dam/...ifications.pdf

I'd be real keen on keeping it full of the proper oil at all times.


Thanks! Yes, no question that is good advice!
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Old 06-06-2018, 05:20 PM   #1187
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My older Cat takes 15W40 and it works well. When you do change oil, there is about 3 quarts remaining in the block when you think it has drained down, so take that into consideration when re-filling.

Two quarts is an awful lot to be down and it should run much better with whatever brand you added.

Good luck!


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Old 06-06-2018, 05:35 PM   #1188
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25-30 psi at 2000 rpm would make me nervous. Is your oil cooler clean, can you mount a fan on it?


good luck, j
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Old 06-06-2018, 06:12 PM   #1189
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My older Cat takes 15W40 and it works well. When you do change oil, there is about 3 quarts remaining in the block when you think it has drained down, so take that into consideration when re-filling.

Two quarts is an awful lot to be down and it should run much better with whatever brand you added.

Good luck!


John
2 gallons.
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Old 06-06-2018, 07:28 PM   #1190
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2 gallons.



Thanks CB, my bad! Won't take long to destroy that engine if that keeps up.



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Old 06-06-2018, 08:53 PM   #1191
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Ok, so after topping off the oil I drove from El Paso to Las Cruces. Didnít realize that there was a huge mountain pass in between. Passed disabled trucks and crept up the thing.

No overheating and no low oil pressure!

Coming down was scary. 8% grade and a runaway ramp. Just kept it low and slow. Finally got to a stop light after getting down off the hill. Maintained oil pressure thru idle no problem.

In hindsight, so obvious.

Wish I had caught sooner. :/

Thankfully seems like no harm done.
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Old 06-07-2018, 04:30 PM   #1192
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Made it to San Diego!

WOW!

The Laguna mountains on I-8 are intense!

From below sea level to 4200 feet and back down again in 30 miles of excitement!

Even towing my Jeep I was able to keep close to 30MPH , which was about what a lot of the big rigs were doing.

Passed about a dozen emergency radiator water stations on the way up.

Pulled like a champ! Never broke 200 degrees and oil pressure stayed strong! Iím sure that the cool weather helped, but I felt fortunate either way.

Weird to keep your foot to the floor for nearly 30 minutes!

It has been quite a ride, but in the end no incident.

San Diego roads and traffic were something else as well after the wide open spaces in the desert.
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Old 06-07-2018, 05:18 PM   #1193
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I hated driving in Kalyfornyastan. I got bagged going west from Needles for exceeding the 55 mph speed limit.
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Old 06-07-2018, 05:51 PM   #1194
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I hated driving in Kalyfornyastan. I got bagged going west from Needles for exceeding the 55 mph speed limit.


Right?! First time in the trip I had to work to keep my speed DOWN! Had a tailwind and the bus just didnít want to slow down!
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Old 06-07-2018, 09:11 PM   #1195
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Mine was in a Freightshaker with a 53' reefer behind.
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Old 06-12-2018, 06:15 PM   #1196
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Cant remember, did you have 2 mini splits? If so, does it call for 2 outside units or could 1 be used for multiple inside units? Also, does yours have a heating function too? Do mini splits generally heat as well?
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Old 06-13-2018, 01:37 AM   #1197
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Cant remember, did you have 2 mini splits? If so, does it call for 2 outside units or could 1 be used for multiple inside units? Also, does yours have a heating function too? Do mini splits generally heat as well?
I won't speak for Dave but I have been doing copious amounts of research on the subject this week.
You can have 2 (even 5 if you wanted) inside units on a single outside unit however most if not all multi head units require 240v.
Most mini splits are "heat pumps" which heat and cool......but not all.
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Old 06-13-2018, 05:19 AM   #1198
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Awesome build! Looked like your journeys were going to bring you to Washington, we would love to meet you guys and see the bus when you get up here.
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Old 06-14-2018, 10:58 PM   #1199
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Cant remember, did you have 2 mini splits? If so, does it call for 2 outside units or could 1 be used for multiple inside units? Also, does yours have a heating function too? Do mini splits generally heat as well?


They are each separate units. I imagine that there are pros and cons, but the HVAC guy who helped me with the final set up said I was better off with two units. As strange as it may seem sometimes you may want to run heat on one and cool on the other and with a single outdoor unit you cannot do this. Also I like the idea of some redundancy and that if I had a problem with one unit I still had another that would function. Finally I donít have 240 V on my bus and as far as I can tell all of the multi unit systems require that.

I donít know how the power demand works with a single outdoor unit but I find that when Iím in a pinch for power I can run one without the other. That probably is true with the other types of units as well but I know for sure that Iím not going to exceed a certain amp threshold if I only turn on one unit.
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Old 06-14-2018, 11:00 PM   #1200
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Awesome build! Looked like your journeys were going to bring you to Washington, we would love to meet you guys and see the bus when you get up here.


Thanks! Itís been working pretty well on the trip so far. Iím not sure if weíre going to make it past Oregon, but it would be fun to meet up if our paths cross!
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