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Fast Idle 8V92 - Printable Version

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Fast Idle 8V92 - maureyroad - 02-23-2009 11:43

Would someone comment on when to use fast idle on 8V92 and when not to
use it and why? Thanks
Dan
88WB38
Jackson, MS

Fast Idle 8V92 - Leroy Eckert - 02-23-2009 12:45

It can be used to warm the engine and built up air pressure quicker than normal idle. It can be used if parked on the freeway waiting for an accident to clear presumably to provide better cooling without using the fan override. I have never tried to put the coach in gear with high idle engaged but I do know if it is working properly it will automatically go to regular idle when the brake pedal is pressed.
Leroy Eckert
1990 WB-40 Smoke N Mirrors
Dahlonega, GA
Royale Conversion

--- On Mon, 2/23/09, maureyroad wrote:
From: maureyroad
Subject: [WanderlodgeForum] Fast Idle 8V92
To: WanderlodgeForum@yahoogroups.com
Date: Monday, February 23, 2009, 6:43 PM



Would someone comment on when to use fast idle on 8V92 and when not to

use it and why? Thanks

Dan

88WB38

Jackson, MS





Fast Idle 8V92 - ciao70@... - 02-23-2009 12:52

Dan, this is Jim Barone fulltiming in a 1991 WBWL with an 8V92..Just a couple of comments..The book says thar after the engine parameters start towards normal ie. a little bit of engine temp,& of course oil pressure, one should use the fast idle to accelerate warm-up..This will also build air pressure more quickly. Additionally the book says that while stuck in heavy traffic use the fast idle to keep the temps down..In general the 2 stroke Detroit does not like to idle for long periods..Hope this helps, Jim





-----Original Message-----

From: maureyroad

To: WanderlodgeForum@yahoogroups.com

Sent: Mon, 23 Feb 2009 5:43 pm

Subject: [WanderlodgeForum] Fast Idle 8V92



Would someone comment on when to use fast idle on 8V92 and when not to

use it and why? Thanks

Dan

88WB38

Jackson, MS





Fast Idle 8V92 - Scott Forman - 02-23-2009 15:14

Dan,

The other comments about cooling, building air pressure, etc, are
correct, but the main reason is this:

The pistons on the 8v92 are cooled from the bottom by oil, a little
spurt sprays up on the bottom. When at low idle, the pressure gets
very low and will not spray enough oil up on the piston. If you idle
in this situation long enough, it will burn your piston. It's
certainly not going to happen in 10 minutes of idling, but you wouldn't
want to idle overnight.

On my coach, the high idle will not engage until the air has built to
about 30psi, I assume this is where the air throttle starts working.
At start up, I click it on as soon as I hit to 30psi mark and leave it
on until I am ready to get underway. At shutdown, I engage it again
until the temps have fallen to an apropriate level to turn off the
engine. I also engage it any time I am stopped for anything longer
than a stoplight.

Actually, I could leave the switch on all the time, the high idle will
only activate when the parking brake is set. But I am anal and prefer
to do it manually.

Scott Forman
86 PT38 8v92
Memphis

--- In WanderlodgeForum@yahoogroups.com, "maureyroad"
wrote:
>
> Would someone comment on when to use fast idle on 8V92 and when not
to
> use it and why? Thanks
> Dan
> 88WB38
> Jackson, MS
>