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Post  czarobest Thu May 14, 2020 11:19 am

I have a boxer too. It works very nicely Very Happy

Here's my video with this engine:

Reaching 5000 - 14 500RPM with MA 7x3 prop on 20% nitro fuel.

All photos is here - https://photos.app.goo.gl/QJivGVUg58Xd2MPr5

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Post  MauricioB Thu May 14, 2020 11:53 am

Hello again! ... Now I realize, I have seen many videos of you on YouTube, it is a beautiful place where you test your engines! ... Is that a forest? ... Look very calm.
Regarding your .12 engine, I see that it works very well!, I am struck by the position of the fuel tank with respect to the carburettor, despite not using pressure in the tank through the muffler, it seems not to have problems when it comes to fuel suction! Could you please tell me what height difference you have there in the video? I mean the height between the tank and the carb, thanks in advance.
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Post  czarobest Thu May 14, 2020 12:11 pm

Hi Smile. I'm firing engines in a narrow belt of birches. It's the closest trees in the CzarDrill movie Smile.
Yeah, the engine is running well despite the wrong fuel tank placement. From the bottom of the tank to the carburetor is about 7 cm (2.75 inches), and from the outgoing pipes (as shown in your picture) it's about 4.5 cm (1.77 inches).
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Post  1/2A Nut Thu May 14, 2020 12:18 pm

Twin pistons so suction cycle is doubled that helps to keep the fuel line loaded
and ready to flow when gravity is trying to migrate it back into the fuel tank.

RC Plane Popcorn
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Post  czarobest Thu May 14, 2020 12:30 pm

@1/2A Nut wrote:Twin pistons so suction cycle is doubled that helps to keep the fuel line loaded...

It's a 2T boxer and the suction through both pistons is at same moment so I think it's not doubled Smile. However, I may have misunderstood Smile
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Post  Surfer_kris Thu May 14, 2020 3:07 pm

I think one of mine did about 14500rpm on the APC 7x4 prop and 10% nitro, but I will have to check/find my notes from that time.

Are you really using a 7x3 prop?
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Post  czarobest Fri May 15, 2020 3:18 am

Yes, I used 7x3 prop, additionality I tested an 8x3 prop and engine reaches about 10 000 RPM. Maybe my engine is in worse condition than yours.
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Post  getback Fri May 15, 2020 8:47 am

That Bad Boy sounds Good !! Very Happy There was just one on eBay for sale .
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Post  Surfer_kris Fri May 15, 2020 10:43 am

@czarobest wrote:Yes, I used 7x3 prop, additionality I tested an 8x3 prop and engine reaches about 10 000 RPM. Maybe my engine is in worse condition than yours.

Well it is not a competition but 14500rpm on a 7x3 prop really isn't not much in terms power, that's kind of .061 engine territory (at least for a diesel engine).

You can check if the cylinders are running evenly by applying glow power to individual plugs with the engine running. That can sometimes reveal a bad plug (rpm goes up with power applied to that side).
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Post  czarobest Fri May 15, 2020 11:00 am

I used two new OS A3 plugs, but thanks for advice Smile.
Maybe it's because of that badly placed tank. I'll check next time Very Happy.
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