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Fox5flyer
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Thu Jan 21, 2010 1:52 pm Post subject: Compression tester |
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Deke-
I've thought about those testers for a long time, and wondered if
they have the .040" master orifice included. As I understand it, a
master orifice of that size is required for pistons of under 5"
diameter, which would include most American cars, and probably most
small airplane engines. Is anybody up to speed on this topic?
If those testers are as good as some of the stuff that I've got from
Harbor Freight, that is an excellent buy.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 840.4 hrs
Countdown to 1000 hrs~159 to go
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
do not archive
On Jan 21, 2010, at 4:33 PM, fox5flyer wrote:
| Quote: |
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?
itemnumber=94190&?
utm_source=internet_email&utm_medium=email&utm_campaign=0410B&utm_cont
ent=v2&r=7598_70903
Just in case any of you are tired of borrowing a leak down tester
for your compression tests, check this one from Harbor Freight.
Deke
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Lynn
Kitfox IV-Jabiru 2200
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sdemeyer
Joined: 31 Jul 2009
Posts: 45
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| Posted: Thu Jan 21, 2010 2:11 pm Post subject: Compression tester |
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Funny you mention this as I just purchased this last night, and then broke it at first use! The directions say to plug into air compressor, then plug into spark plug hole, then adjust the regulator until the leak gauge gets to zero. This is incorrect as you need to adjust the leak down gauge to zero before connecting to spark plug hole.
Mine broke because I cranked the input pressure to 87psi, expecting the leak down gauge to be the same. It's not. the leak down gauge is only 15 psi max. If you crank the regulator past 20psi, the leak down needle will break, as mine did.
Scott
--- On Thu, 1/21/10, fox5flyer <fox5flyer(at)idealwifi.net> wrote:
[quote][b]
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Fox5flyer
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| Posted: Thu Jan 21, 2010 2:12 pm Post subject: Compression tester |
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If it doesn't have the correct size all you need do is tailor it. I little
brazing of the current one and drill it to size. I bought one of these
about ten years ago and still works fine.
Deke
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Paul A. Franz, P.E.
Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA
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| Posted: Thu Jan 21, 2010 5:30 pm Post subject: Compression tester |
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On Thu, January 21, 2010 1:33 pm, fox5flyer wrote:
We have a huge Harbor Freight store very near us so I have bought several items now. I
have come to realize that most are very low quality Chinese manufactured goods. One
item, a propane powered radiant heater, failed to start from new. Pilot light would go
out without starting main burner. Returned it and checked out a new one at the store.
Loose parts fell out of the box. The third one seems to work but blows out with the
slightest breeze, I mean a whisper will blow it out. I bought some impact sockets -
marked Heavy Duty Commercial Use. The first one I tried split, second one just rounded
out. I bought a small gear puller to remove a pressed on flywheel. The main arms bent
while tightening the first use.
So, I guess, I am not too confident that what you get there will work very well.
We have another tool store called Tool Town and I have had very good luck with them
over the years. Bought a lot of No. 30 twist drills from them. They seem to have
higher quality stuff although more expensive than Harbor Freight.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
In general, the art of government consists of taking as much money as possible from
one party of the citizens to give to the other.
-- Voltaire (1764)
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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office |
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