Today's Message Index:
----------------------
1. 03:22 AM - Crowder Spinner (Ahmed M. Ragheb)
2. 11:43 AM - Is there an over-priming hydraulic lock monster? (Elmar & Manuela Hegenauer)
3. 01:21 PM - Re: Is there an over-priming hydraulic lock monster? (Brian Lloyd)
4. 05:19 PM - Re: Is there an over-priming hydraulic lock monster? (Rob Rowe)
5. 07:58 PM - Re: Re: Is there an over-priming hydraulic lock monster? (cjpilot710@AOL.COM)
Message 1
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Does any one know of a Crowder spinner or parts for sale?
Med
N53CJ
Message 2
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| Subject: | Is there an over-priming hydraulic lock monster? |
Numerous times I have read about the
possibility to get a hydraulic lock by
over-priming.
Today I have pulled the primer line on
my CJ and measured the exact amount of
gasoline per priming stroke at 20 degrees
Celsius ambient temperature.
I have repeated the test 60 times and
each time it was almost exactly 7.15 ml
per stroke.
In the past I was told one needs at
least 120 ml of any kind of fluid per
cylinder to evoke the infamous hydraulic
monster.
So here comes my question, either
I did something wrong or is it nearly
impossible to cause a solid hydraulic
lock by over-priming?
Your opinion on this matter is highly
appreciated.
cheers
Elmar
Message 3
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| Subject: | Re: Is there an over-priming hydraulic lock monster? |
On Tue, Jun 26, 2012 at 2:40 PM, Elmar & Manuela Hegenauer <samira.h@shaw.ca
> wrote:
> I have repeated the test 60 times and
> each time it was almost exactly 7.15 ml
> per stroke.
>
> In the past I was told one needs at
> least 120 ml of any kind of fluid per
> cylinder to evoke the infamous hydraulic
> monster.
>
> So here comes my question, either
> I did something wrong or is it nearly
> impossible to cause a solid hydraulic
> lock by over-priming?
>
> Your opinion on this matter is highly
> appreciated.
>
There you go, trying to apply science and engineering to understanding the
airplane. That will just NOT do!
;-)
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 4
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| Subject: | Re: Is there an over-priming hydraulic lock monster? |
That also tallies with the 8cc stated capacity of the YAK primers, so unlikely
you'll ever solid lock a cylinder through over priming.
However 6 or 7 primes worth could still get you the best part of 40cc into the
lowest cylinder, which would increase the compression by about a third.
Apparently it's that iterative shock that leads to the Russian plug cores blowing
(as well as mishandling them). Don't know if the same holds true for Chinese
plugs. So while better than bending a rod it's still a scary ride on 8 cylinders
with one open to the atmosphere ... the power is usually only slightly down
but the vibration is extreme.
Happened twice on my -52 in the first couple of years of ownership, then fitted
a manifold drain 12 years ago without further re-occurrence. Now while that was
probably more oil than fuel related it makes sense, having addressed the oil
risk, not to replace it with another fuel one.
Given engines start / run on vapour anyway, not liquid fuel, I always leave the
manifold open after priming until the bulk of the excess drains out ... usually
starts first time and avoids the iterative risk IMHO.
Rob R.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=376686#376686
Message 5
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| Subject: | Re: Is there an over-priming hydraulic lock monster? |
In the some 2,000 hours of operating a M-14 (over the last 17 years) I've
never needed more than 6 pumps (I usually just pump 4 times) of the primer
to get a M-14 started. No where does one need to pump 20 times, or did I
read that wrong. A hydraulic lock by over priming? Very un likely.
Jim "Pappy" Goolsby
In a message dated 6/26/2012 8:19:19 P.M. Eastern Daylight Time,
yak-list@robrowe.plus.com writes:
--> Yak-List message posted by: "Rob Rowe" <yak-list@robrowe.plus.com>
That also tallies with the 8cc stated capacity of the YAK primers, so
unlikely you'll ever solid lock a cylinder through over priming.
However 6 or 7 primes worth could still get you the best part of 40cc into
the lowest cylinder, which would increase the compression by about a third.
Apparently it's that iterative shock that leads to the Russian plug cores
blowing (as well as mishandling them). Don't know if the same holds true
for Chinese plugs. So while better than bending a rod it's still a scary ride
on 8 cylinders with one open to the atmosphere ... the power is usually
only slightly down but the vibration is extreme.
Happened twice on my -52 in the first couple of years of ownership, then
fitted a manifold drain 12 years ago without further re-occurrence. Now
while that was probably more oil than fuel related it makes sense, having
addressed the oil risk, not to replace it with another fuel one.
Given engines start / run on vapour anyway, not liquid fuel, I always
leave the manifold open after priming until the bulk of the excess drains out
... usually starts first time and avoids the iterative risk IMHO.
Rob R.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=376686#376686
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