Make the reservation for my V4 engine project

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minh-thanh

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Ladies and gentlemen !
I make the reservation for my V4 engine project
Bore 16 mm , stroke 20 mm , with water radiator .
Assembly1 OK.jpg Assembly1 OK1.jpg Assembly1 OK2.jpg Assembly1 OK3.jpg Assembly1 OK4.jpg
 

Johno1958

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I like your engine's Minh Thanh .
I also am looking forward to your build.
 

minh-thanh

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Thank you for your interest in my project!
I can draw, BUT: "it's easier said than done"
With all the knowledge I have learned from all of you , I will try to finish it ... hope it will run !

Today, I made a cylinder just to find a way to prevent water from entering the crankcase
And :
20190526_153351.jpg 20190526_153404.jpg 20190526_153441.jpg

Then I realized it was not necessary, just do as the image below is enough :D
20190526_180326.jpg 20190526_180349.jpg
 

minh-thanh

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Hi All !
2 days ago, I made the crankshaft for V4 engine, it is little bending , but the problem I care should I cut it like a as shown below? ( I don't know what English it calls )
It's the second one
Thanks for the advice !2.jpg 20190604_183652.jpg
 

Cogsy

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I think you're asking if you should trim the crank webs so as to have a counterweight? If so, it's really up to you. On cranks this small I don't see it making a lot of difference really, although I think it looks a bit nicer with the counterweights. But then again, no-one is going to see it inside the engine so it doesn't really matter what it looks like. I think it's fine either way so go with what you're happy with.
 

minh-thanh

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Hi Cogsy !
Yes, that's what I want to ask.
You are right, although I want to do it, but maybe next time (or not necessary). I have more work to do than worry about it.
Thanks Cogsy !
And
Hi All !
update 1 my V4 project :
20190615_180934.jpg
 

Cogsy

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If the bore and stroke were the same, with similar compression ratio, and the flywheel had enough inertia to keep the V2 going between power pulses, then it will have more than enough inertia to keep the V4 going between power pulses. If it's a completely different bore and stroke or compression then it may not be suitable. You can always try it and see, then size a replacement based on how it performs.
 

minh-thanh

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If the bore and stroke were the same, with similar compression ratio, and the flywheel had enough inertia to keep the V2 going between power pulses, then it will have more than enough inertia to keep the V4 going between power pulses. If it's a completely different bore and stroke or compression then it may not be suitable. You can always try it and see, then size a replacement based on how it performs.
It have the same bore and stroke I have reduced to 16mm .
Thanks Cogsy !
And Hi ALL !

Update 2 my V4 project :
20190619_192310.jpg 20190619_192333.jpg 20190619_192409.jpg
 

minh-thanh

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Hi All
I have a question :
usually, The front of the engine is which direction? direction from flywheel or opposite direction?
Thanks !
 

Cogsy

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The front is the opposite end to the flywheel. In a rear wheel drive car, the 'front' of the engine is at the front of the car, with the motor mounted so it's running towards the back wheels. The flywheel end is connected to the gearbox and so is always the 'back'.
 

stevehuckss396

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The most common engine direction for an automotive style engine is clockwise rotation looking at the front of the engine. I believe most aircraft engines turn counterclockwise.
 

bluejets

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In a model boat, the front of the engine is the flywheel and it points towards the back of the boat. (converted aircraft engines)
Model aircraft engines mostly run anti-clockwise looking at the prop.
Mate of mine built a scale engine. My Dad pointed out it was running backwards from the full size version but hey, still works.
Cannot see why all the fuss about direction anyhow.
 

Cogsy

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You can number your cylinders however you want. Some V-engines have odds and evens, like yours, some run in order down one side then down the other. It's whatever you feel comfortable with.
 
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