Zero Turbo Boost Follow Up

[George Lowry]

While I have not had the line come off the turbo, I did have a 1/4"
air line come loose on another coach. It lost enough air pressure that
the brakes set up. I could not move until I found that "leak". i.e. I
could not build up enough pressure (60 psi) to release the parking
brake. Luckily I was in the entrance to a rest area at the time.

As to heat, the turbo does heat the air somewhat but not enough to be
dangerous. Remember we are dealing with intake air, not exhaust air.
It still behooves us to investigate ANY unusual readings on the gauges.

George Lowry
'06 Alpine Apex - formerly '95 WBDA 4203
Spearfish, SD Currently in Quartzsite, AZ trying to get moved from one
coach to the other.


John Suter wrote:

> Thanks for taking the trouble to answer, Steve.
>
> I suppose when the 1/4" opening connects to a gauge,
> no actual "flow" exists as the purpose is to measure
> pressure under closed conditions. However, my guess
> is when an opening does occur, the outflow could/would
> consist of hot gasses, which could be hazardous. My
> concern is where any hot gasses are going!!! Perhaps
> other members can comment on whether your specific
> 1/4" tube opening could become hot.
>
> What I do know from personal observation is when a
> crack in the manifold occurs (a crack barely wide
> enough to insert a fingernail, and about 6 inches
> long) it can create a serious firehazard, and has. My
> guess is that size crack might permit more to escape
> than the 1/4" diameter hole you experienced.
>
> Whatever the circumstances of sudden unexplained
> loss of power accompanied by unusual low turbo
> pressure readings, Forum members need to seriously
> heed the warning to shut off the engine and grab a
> fire extinguisher on the way out the door; coaches and
> belongings can be replaced, our fine members are
> irreplaceable.
>
> John Suter
>
>
> --- nicodemus815@... wrote:
>
>
>>>WOW Steve. Do I understand that a 1/4" opening was
>>
>>the sole cause of
>>virtually all loss of power?
>>
>>
>>I was able to drive at 50MPH on a flat road. I was
>>unable to accelerate
>>faster though. I was able to stop and start and
>>build up momentum, until I reached
>>50+/- MPH again. I'm glad I didn't have to go up a
>>mountain though.
>>
>>The hose appears to go to the dash gauge. I guess
>>the 0.25" hole was enough
>>to prevent the pressure from building up and forcing
>>air in the cylinders. I'm
>>thinking I hardly ever got above 15psi of boost, so
>>I guess it is conceivable
>>that the . 25" hole could leak that much pressure.
>>I'll watch the #'s more
>>closely on the way home to see what my boost
>>pressure is.
>>
>>What do the experts say......
>>
>>Steve Harrie
>>8v92 '86PT38
>>
>>
>>[Non-text portions of this message have been
>>removed]
>>
>>
>
>
>
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