Harbor Fright Images
Here are images taken with the Harbor Freight digital inspection camera (aka borescope).
I believe somewhere I read Walt said a borescope needed to be able to clearly see the space between the valves (presumably to check for cracks). This scope does this task easily as two of the photos show.
Between the intake and exhaust valves on cylinder 1.
Between the intake and exhaust valves on cylinder 3.
I was hoping to be able to get a picture that showed one entire valve at a time. I have not been able to do that yet. It may not be possible but I've come close enough that I plan to keep trying...just not right now. The weather is too nice. Here's as close as I came this afternoon.
Now if you look at the first and third photos, the lighting is uneven. This camera only has one LED for illumination. Also, in the first and third photo you'll see a bright semicircle at the bottom and in the second photo its in the lower right. That is a reflection off the edge of the mirror. It has nothing to do with the engine.
The spectral highlights (blurry bright dots) are dust on the mirror. I used a Q-Tip frequently to clean the mirror and I still had dust to deal with.
The cameral also takes movies and I tested that feature out. I have not uploaded any yet but the quality is comparable to the still shots and you can pan around and see pretty much anything you want but don't look for Hollywood smooth video but I think for documenting the condition of your engine at its annual condition inspection (or whenever) this camera will work well.
Over-all, I'd give it a B+. The photo quality is good but I wish it was capable of a wider angle view. The mirror snaps on (I really like the screw on feature) and it's putzy keeping it free of dust. I'm also not wild about the uneven lighting but it is certainly adequate. For $150, it isn't perfect but it will probably do anything you're likely to ask of it.