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  #1  
Old 06-16-2012, 06:58 PM
339A's Avatar
339A 339A is offline
 
Join Date: Jan 2005
Location: Littleton, CO
Posts: 368
Default Tool Deathmatch: Costco Borescope vs Chinese Oral Scope

Well this all came about because my #3 cylinder exhaust valve was leaking by again. A few years back I had the same problem. I lapped the exhaust valve and compression went back up. My last oil change showed a pretty significant drop down, about 70/80. Another check a couple weeks later had it at 65/80. This is getting somewhat serious now....

Lately I have been listening to Mike Busch "Savvy Aviator" series on the EAA website. He provides a lot of great information in his webinars. In the one "All About Cylinders", Mike talks about using an Intraoral Dental camera to inspect the cylinders. Well these things are pretty expensive and Scotty is pretty **** cheap. Also, I imagine it's hard to find a dentist who is willing to give one up. Alas, don't give up hope. The Chinese have made knock offs for just about everything out there. I came across a website called DH Gate and found a dental camera for $89.00 shipped direct from The Orient via China post...

Some notes about DH Gate: it appears to be some kind of Chinese Amazon from what I can tell. I was a bit leery ordering from this site but figured if I used Pay Pal and it didn't show up (they had a guarantee), well I'm out 90.00 bucks, but I might be able to get that back from Pay Pal. A couple weeks later it actually did show up as promised, via Chinese post, in my mail box.

I loaded the software.... Well let's just say the software is not the greatest. I think it is some kind of knockoff Dental software, however I did manage to make it work and figured out how to capture pictures with it. The instruction manual is written in the finest Chinglish now available. As an example from the troubleshooting section:

Item 3

trouble states: in the process of use, the image will be a little blurry

resolve methods: if you use it the first time, it belongs to natural reaction. It will be better later on


Item #4


trouble states: freezing images then appears dithering


resolve methods: the hand shakes when uses camera to capture image, when users are skillful for use products, the phenomena can be changed


Huh...????
I'm NOT making this up.

Oh well, it is from China after all.

Today I had the chance to give my new Chinese dental scope a try. First off (and I knew this might happen) it wouldn't fit into the spark plug hole. ****! No worries. I built an airplane, I'm sure I can modify this Chinese POS into something that will work. I'll just take it apart and see what's inside. This is what I came up with.

I opened it up, took it apart, cut the case on the band saw, and put it back together. A piece of green heat shrink to protect the circuit board and ICs. Voila!




I had re-lapped the #3 exhaust valve a couple weeks ago and wanted to check my compression to see if it had improved. After flying today and with my trusty Chinese dental scope in hand, it was time to find out. Good news, the #3 cylinder is back up to 78/80. Woo Hoo!! So let's try the camera and see how it works...

Now I called this post "Tool Deathmatch: Costco Borescope vs Chinese Oral Scope." What you haven't seen yet are the pictures I took with EAA Chapter 301's Costco borescope. I had borrowed this tool a couple months ago to try and get a look at the exhaust valve. The thing took terrible pictures. My grandson's Fisher Price camera works better than this! Honestly, this is the BEST picture I got of the exhaust valve. The rest of them were worse, if that's possible. You can sort of make out the shape of the valve.





Here are some pictures from today using the modified Chinese POS dental scope:

#3 Exhaust Valve. Look at the detail in the seat.




Another shot of the #3 exhaust valve



A pic of the #1 intake valve, just because.



Well, what can I say... looks like Chinese POS wins the match hands down! K.O. I'm pretty pleased with the results. For $89.00 dollars I've got a GOOD inspection tool for my engine. How long will it last, I have no idea.

Deb and I are planning a trip next week to San Diego to visit our son/daughter in-law and grandkids. I wanted to be sure that I didn't have an exhaust valve problem before we headed out over the Rocky pile. Now I feel much more comfortable about keeping this engine going. After all, this H2AD now has 1800 hours total time on it and 1100 of those are on 339A!

Regards,
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Scott Mills, Front Range, CO
N339A - 1900 Hours!! since 9/11/05
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Airport Landings

"In order to discover new lands one must have the courage to lose sight of the shore." Andre Gide

"Never feel sorry for a man who owns a plane" Charles Morse (Anthony Hopkins) in The Edge

Last edited by 339A : 06-20-2014 at 07:16 PM.
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  #2  
Old 06-16-2012, 07:56 PM
John Courte John Courte is offline
 
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Default

That's really cool! The images remind me of Jim Cameron's original Titanic video footage, the stuff he shot at the bottom of the ocean.
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  #3  
Old 06-16-2012, 08:22 PM
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panhandler1956 panhandler1956 is offline
 
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Default Cool

I'll have pick one up! Thanks for the write up!
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  #4  
Old 06-16-2012, 09:53 PM
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rocketbob rocketbob is offline
 
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If you can't inspect around the valve seats and the area between the spark plug hole and the exhaust seat is probably not worth messing with.
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  #5  
Old 06-17-2012, 06:58 AM
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DanH DanH is offline
 
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Need more information about the the Batch 19 Pre-Prohibition Style Lager.
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  #6  
Old 06-17-2012, 08:27 AM
jbDC9 jbDC9 is offline
 
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Quote:
Originally Posted by DanH View Post
Need more information about the the Batch 19 Pre-Prohibition Style Lager.
Ha! That's the first thing I thought of as well... mmm, beer.

Gotta love the interweb and Ratebeer.com; it appears to be a small batch Coors brew...
http://www.ratebeer.com/beer/coors-batch-19/122612/
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  #7  
Old 06-17-2012, 10:42 AM
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339A 339A is offline
 
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Default Batch 19

Fortunately for me I work with a lady who is retired from Coors, as well as her husband. Needless to say I get some pretty good buys on different Coors beer. According to Coors advertising: "a few years ago when we discovered and old recipe in the basement archives of the brewery, dating back before Prohibition"

Anyhow it really is pretty tasty and seems to be competition for Sam Adams Boston Lager. Very similar style. I like it at 5.5%

I plan to bring a case with me to OSH maybe two, if I can get Bryan Raley aka "The Mule" to agree. We'll be in HBC all week stop by and if there is any left you're more than welcome to have one.

Scott

Quote:
Originally Posted by DanH View Post
Need more information about the the Batch 19 Pre-Prohibition Style Lager.
Quote:
Originally Posted by jbDC9 View Post
Ha! That's the first thing I thought of as well... mmm, beer.

Gotta love the interweb and Ratebeer.com; it appears to be a small batch Coors brew...
http://www.ratebeer.com/beer/coors-batch-19/122612/
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Scott Mills, Front Range, CO
N339A - 1900 Hours!! since 9/11/05
Like Us on Facebook: https://www.facebook.com/ScottandDeb...tures/timeline
Airport Landings

"In order to discover new lands one must have the courage to lose sight of the shore." Andre Gide

"Never feel sorry for a man who owns a plane" Charles Morse (Anthony Hopkins) in The Edge

Last edited by 339A : 06-17-2012 at 04:48 PM.
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  #8  
Old 06-17-2012, 11:31 AM
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339A 339A is offline
 
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Quote:
Originally Posted by rocketbob View Post
If you can't inspect around the valve seats and the area between the spark plug hole and the exhaust seat is probably not worth messing with.
According to Mike Busch, who is also a well-known and respected engine guru, his take on borescope inspections is somewhat different. I know the Webinar video is long, but it's well worth watching. Just pick it up from about 29 minutes on. This is where he starts the discussion on borescopes, what he uses, and what he looks for. Very informative. I particularly like his statement at around 46:10.

My still photos don't show it, but I can actually get quite a bit of movement with the camera. Given that the RV fleet is growing and aging every day, we NEED to be doing these kinds of inspections to keep ourselves safe and the hobby in good standing.
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Scott Mills, Front Range, CO
N339A - 1900 Hours!! since 9/11/05
Like Us on Facebook: https://www.facebook.com/ScottandDeb...tures/timeline
Airport Landings

"In order to discover new lands one must have the courage to lose sight of the shore." Andre Gide

"Never feel sorry for a man who owns a plane" Charles Morse (Anthony Hopkins) in The Edge

Last edited by 339A : 06-17-2012 at 04:49 PM.
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  #9  
Old 06-17-2012, 11:56 AM
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Walt Walt is offline
 
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Looks like excellent pictures! I've ordered one, thanks for the review.
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  #10  
Old 06-17-2012, 12:13 PM
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rocketbob rocketbob is offline
 
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Quote:
Originally Posted by 339A View Post
According to Mike Busch, who is also a well-known and respected engine guru, his take on borescope inspections is somewhat different.
I use a Lenox borescope and nothing I do is anything different than what he looks for but I have caught cracks between the spark plug hole and the exhaust valve. With the Lenox I can inspect this area easily. If this video borescope can do that I'll buy one in a heartbeat.
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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