Car and plane .049 Reed valve engines crankchaft difference

davidll1984 Mon Apr 12, 2021 10:20 am

I've been asking myself this question for a while What other engine is fitted with this crankshaft it is smaller but wider more robust solid its crank pin base larger stronger and its tdc is difrent wit its crankcase no spi wit its cylinder on a difrent crankchaft crankcase cylinder have spi ? I just want To Find a Good one and Also is whether another engine is made like them it is a gtp engine. First model with a rc ring silencer

Car and plane .049 Reed valve engines crankchaft difference Img_2178

Car and plane .049 Reed valve engines crankchaft difference Img_2179

Car and plane .049 Reed valve engines crankchaft difference Img_2177

I remember seeing one on another engine model one with a plastiques back plate wit ring retainer for the valve old model pré 90 think Huh...

Cox claimed at the time that this engine was capable of reaching a speed of 30 k Eyebrows

davidll1984 Mon Apr 12, 2021 11:47 am

I'm looking but find nothing for now I can't believe I'm the only one to notice this huge difference in timing also that the crankcase is different the seat of the cylinder is higher The crankcase does not interest me just the crankshaft so I'm looking for a smaller but thicker crankchaft with different timing the crankcase will not help to define the type of crank inside But the stroke of a piston with a cylinder is different with this crankchaft and can help define this, is one. I Hope someone can help me find the airplane engine which uses the same parts? Think Huh...

With a different cylinder seat height, it will be lower to allow the spi

gkamysz Mon Apr 12, 2021 3:11 pm

Did you measure the stroke?

**944_Jim** Mon Apr 12, 2021 4:59 pm

David,
You may want to review the car engines for the Baja Bug and the Sandrail (name escapes me right now). I believe both have a different crank than the aero engine blocks. You can find adapters at EXModel Engines to adapt the heavier crank to aero use:
http://www.exmodelengines.com/home.php?cat=282

I seem to remember the car block has a significantly heavier block around the main bearing and a heavier "prop drive plate." I also think I can lay my hands on my old Baja Bug block and crank...I'll try to look tonight. If I find them, I'll try to post a side-by-side.

davidll1984 Mon Apr 12, 2021 6:12 pm

Well I must specify the crank has the same diameter use the same drive plate prop drive plate as a bee just like a black widow crankcase just difrent height for the cylinder seat and yes stroke is Shorter as i say it Eliminates sub piston induction or reduce it on difrent crankcase like one for the black widow its on a gtp older model

davidll1984 Mon Apr 12, 2021 7:16 pm

At first vue look the same its Not

Car and plane .049 Reed valve engines crankchaft difference 16182713

Car and plane .049 Reed valve engines crankchaft difference 16182712

Car and plane .049 Reed valve engines crankchaft difference 16182714

Don't consider the color, it's me who changes it use if i want i can build one terminator engine" />

davidll1984 Mon Apr 12, 2021 11:03 pm

Here is what the engine of my nissan gtp will look like just a start very far from final

Car and plane .049 Reed valve engines crankchaft difference 16182810

Car and plane .049 Reed valve engines crankchaft difference 16182811

davidll1984 Tue Apr 13, 2021 10:02 am

I will try to measure the difference in stroke between the two, which is almost visible to the naked eye. But very small difference with the different crankcase spi is always functional with the two just a smaller opening with the crankcase of the gtp almost close wit the blue one mutch larger i just tink its bether crankchaft Not loose like wit the hd crank wil test Anyway I already know how to have a maximum of performance I want more more acceleration more topend rpm on a bee like 30k And he has to withstand that mutch

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Car and plane .049 Reed valve engines crankchaft difference

Car and plane .049 Reed valve engines crankchaft difference

Re: Car and plane .049 Reed valve engines crankchaft difference

Re: Car and plane .049 Reed valve engines crankchaft difference

Re: Car and plane .049 Reed valve engines crankchaft difference

Re: Car and plane .049 Reed valve engines crankchaft difference

Re: Car and plane .049 Reed valve engines crankchaft difference

Re: Car and plane .049 Reed valve engines crankchaft difference

Re: Car and plane .049 Reed valve engines crankchaft difference

Re: Car and plane .049 Reed valve engines crankchaft difference