Maybe I'll call it Threedom * latest topic *

[gltriker]

post#361

Wow!Some serious tinkering going on
there!I've realy enjoyed your (Threesome) built so far and can't wait to see the finished trike!

Thanks, Ccarel1
Some fellows say it isn't finished without rear fenders
Since very late 2012, until May, 2020 It and I have travelled over 30,000 miles; without fenders.

Until I added the saddlebags in 2015, very little rain would get onto me as long as we were moving.
The large front fairing and its windshield protected all but my boots and pants cuffs.
Rooster tails off the rear tires were always very entertaining to see in the rearview mirrors.

The addition of saddlebags the night before I rode to the 2015 Paris, Ontario Fairgrounds Rally significantly changed the airflow dynamics around the back of the trike. On my ride home, rain started falling and totally unexpected, suddenly my back and helmet were getting soaked and rain was wetting the back side of my windshield, too!
Exhaust fumes would surround me enough to give me a headache if I slumped down and didn't keep my face in the wind.

I believe my trike riding days are almost finished since I broke my neurologically weakened right leg in 2018. c'est la vie

[gltriker]

They don’t make guys like your friend anymore. Rat said it perfectly, so ditto.

Yes, Jim was a unique fellow. It has been almost 2 years since I last saw him alive in a nursing center.
The 2020 March shut-down prevented me from ever seeing Jim again. He died around 2 months later.

[Fred Camper]

Also agree with Gord, that each ride you took was a tribute to his efforts. Most fortunate for your acquaintance with Jim and without a partner like that your Threedom would be limited. I do know how well you both worked together. Covid shutdown was bad timing for your situation for sure. Think the Trike is a trophy now!

[gltriker]

post#364

My 1975 GL1000 engine's cylinder leak down rate varies from approximately 4% to 7% across all 4 cylinders.
Yes, I have tested the individual cylinder pressure leak down rates many times over the last 8 years this engine was running.
Yes, I do believe those numbers are realistic on these engines; only when each complete combustion chamber is operationally "healthy" , though.
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notes:
* 1-the Air compressor must maintain a constant supply of more than 100 psi delivered to the cylinder leak down rate tester. On this tester's gauge face, 0% = 100 psi.
( Refer to the User Information Instructions that accompany your leakdown tester)

* 2-A compression tester adaptor hose (or other 12mm test fitting) can be utilized for leakdown testing after its integral 'schrader' type, threaded-in check valve core is first removed. view this example- download/file.php?id=89308

VERY IMPORTANT! Keep fingers away from exposed PINCH/CRUSH Timing Belts and Pulleys Before and During the insertion of pressurized air into a Tested Cylinder!! AND be 100% clear the transmission has been/ IS selected to NEUTRAL, TOO!
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thumbnail_20200521_144021_resized coupler disconnected.jpg

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20200521_135008_ CYLINDER #1.jpg

20200521_135008_ CYLINDER #1.jpg

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thumbnail_20200521_142137_resized CYLINDER #2.jpg

thumbnail_20200521_142137_resized CYLINDER #2.jpg


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20200521_140822 CYLINDER #3.jpg

20200521_140822 CYLINDER #3.jpg

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20200521_143613 @3 CYLINDER #4.jpg

20200521_143613 @3 CYLINDER #4.jpg
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https://ngwclub.com/forum/viewtopic.php?f=54&t=66749
IMPORTANT read this AND the SIMILAR TOPICS at the very bottom of that same page

https://ngwclub.com/forum/viewtopic.php?t=65099 <<<<< a SIMILAR TOPIC

I trust my Kohler engine diagnostics cylinder leakdown rate tester's accuracy. Nothing fancy. Single gauge.

[Fred Camper]

My guess if you are par for the course.

[gltriker]

I suppose so, Jeff

The first time I had Cylinder Leakdown Rate tested the 1975 GL1000 trike's engine was 10 years ago. At the time the bike had 7,831 miles on its odometer.

Upon installing my Kohler engines Leakdown Tester assembly onto the first cylinder to be tested and inserting regulated air pressure, The Leakdown Tester gauge's displayed percentage of Cylinder pressure loss reading was so minimal, I had suspicions my tester was affected somehow. hmmmm....

After a few moments of my puzzlement passed, I very slowly pushed down on the kick start lever to roll the crankshaft off TDC . Didn't require much rotation of the crankshaft for the applied air pressure to suddenly spin the crankshaft towards BDC.
The tester gauge reading dropped to 100% loss. Expelled out the exhaust port.

The leak down test numbers in these photos ( up there ) and individual Cylinder Compression test numbers ( next post down ) were taken when the trike's original odometer displayed almost 39,000 miles.
2 years ago. My last ride probably.
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38,932 miles.jpg

[gltriker]

*post#367

I've added this very brief compression test video and photos to my trike's "build thread" for historical purpose,
The Snap-On gauge needle is twitchy at the higher readings. The needle climbs to 150ish psi in 10 compression strokes though ALWAYS Crank the engine until the needle won't climb any higher.

Note: Yes. All intake and exhaust valves' lash clearance are set at 0.006 inch.

note: to achieve most accurate cylinders pressure testing results, use a correct testing adapter.
an example - download/file.php?id=89308
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Cylinder #1 Compression Test Video - at 38,932 miles

Note: Please Scroll Down to POST #368 to find the #1 Cylinder Compression Test Video.
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Cyl. # 1 max. PSI

Cylinder # 1 best.jpg

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Cyl. # 2 max. PSI

Cylinder # 2.jpg

update[/color]

Screenshot 2023-09-06 110741 june 3 2003 comp test cyl 2 0.006i lash.jpg

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Cyl. # 3 max. PSI

Cylinder # 3.jpg

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Cyl. # 4 max. PSI

Cylinder # 4.jpg

(~ 10 seconds actual cranking time, yielded approximately 30 compression strokes ) ( 60 revolutions x 6 = 360 rpm. )

even More cylinder compression testing equipment photos- See Post #13 and Post #19
viewtopic.php?p=803393#p803393
viewtopic.php?p=803584#p803584 "Real World Cylinder Compression

[gltriker]

POST #368

Here's the video presenting the compression testing results of Cylinder #1 - with intake and exhaust valves' lash clearance set at 0.006".

20230603_135038.mp4

stop at 13 seconds
AND note-
I used my snap-on 12mm compression test adaptor hose, that threads directly into the spark plug hole.
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20191213_204517_1637796073345_resized (1) (1).jpg

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20200112_113223_1637982760730_resized (2).jpg

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in the event you choose NOT to download the video, here's its screenshot at the last second of total length
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Screenshot 2024-04-28 001645.jpg

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ADDED April 21, 2025
A proper 12mm compression test adaptor will have its check valve positioned as close into the cylinder head's combustion chamber cavity as possible.
Visualize where the spark plug ground strap is positioned in the spark plug hole when the spark plug is fully installed and torqued into place. That's the place the check valve belongs.
If a typical generic 14mm to 12mm reducer adaptor is utilized, the all-important check valve is always positioned farther away from the spark plug hole opening into the cylinder head chamber.
In essence, that extra unchecked area in the spark plug hole and 14mm to 12mm adaptor is added as if the tested volume of the cylinder head combustion chamber has been increased; resulting in a lower calculated static compression ratio number, witnessed as a lesser pressure result on the cranking compression tester gauge face.

viewtopic.php?p=803393#p803393

Always continue cranking the engine over during the compression test session until the needle climbs no higher on the gauge face.
Forget the ages old advisement to count to 10 compression strokes. Why? I've observed multiple times during the compression testing sessions with my '75 GL1000 engine, as the individual cylinder pressures are reaching higher numbers, the gauge needle will twitch back forth a few psi (5-10 ish) until the needle finally stops climbing on the gauge face. Then I release the starter button.

@ericheath
I've longed to perform the testing procedure to measure cc's of the GL1000 cylinder head combustion chamber with an NGK D8EA spark plug, fully installed.

Then, after removing the NGK D8EA spark plug, perform another cylinder head cc's test with a proper checked 14mm compression tester hose adapted down to 12mm spark plug hole threads diameter to compare the difference in liquid testing fluid displacement volume (cc's) between the correct and incorrect spark plug hole compression testing adaptors.

I have an old GL1000 cylinder that sorely needs to be prepped for this project but haven't invested in a clear square of chamber covering acrylic sheet. Also need a graduated burette for the testing liquid.
They are expensive...

[Whiskerfish]

WOW!!

[Sandy]

I account for quite a few as well.

[flyin900]

Cliff,

I have a leak down tester and I have found that a smaller amount of pressure in the 40-50 PSI range works well. I am following more of what a online rebuilder posted for smaller bore fours, which the GL series is not small bore.
I think his reasoning was the higher pressure of the 100 PSI + can start to turn the piston being measured off TDC.

I have never done Wing engine.... as all mine are PERFECT!

That's my hope anyway, as the Wings both run great.

[gltriker]

Cliff,

I have a leak down tester and I have found that a smaller amount of pressure in the 40-50 PSI range works well. I am following more of what a online rebuilder posted for smaller bore fours, which the GL series is not small bore.
I think his reasoning was the higher pressure of the 100 PSI + can start to turn the piston being measured off TDC.

I have never done Wing engine.... as all mine are PERFECT!

That's my hope anyway, as the Wings both run great.

I agree; if the crankshaft unexpectedly starts to rotate away from Top Dead Center, simply let it go and start over again. The probability of getting injured hands at 100 psi is very real.
Welllllll, you know now, you have to test both PERFECT Wing engines to give me a benchmark for comparison sake.

[gltriker]

I account for quite a few as well.

GL1000 Trikes in Paris (Ontario, Canada ) 6/15/2018 the 'Yellow' is Sandy's ride.

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100_6021_1662317296447.jpg

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6/16/2018 - sitting in the Paris (Ontario) Fairgrounds parking lot -- me lookin all smug-like waiting to ride 240 miles back to Syracuse. 5 and 1/2 riding hrs later....broke my weak leg at home

36063377_10210195102988834_2801395133235331072_n.jpg

[CYBORG]

rememer that rally....... good times.... good times

[Rat]

Yes indeed … great fun, good people

Gord