Make the reservation for my V4 engine project

[minh-thanh]

Ladies and gentlemen !
I make the reservation for my V4 engine project
Bore 16 mm , stroke 20 mm , with water radiator .

 

[stevehuckss396]

very original design. looking forward to more information.

 

[kuhncw]

Nice design. Looking forward to your build.

 

[Johno1958]

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

 

[Cogsy]

Looking forward to seeing this one.

 

[retailer]

Good luck with your build I'll be watching.

 

[minh-thanh]

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 :


Then I realized it was not necessary, just do as the image below is enough

 

[minh-thanh]

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 !

 

[Cogsy]

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]

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 :

 

[retailer]

Looks good keep it going.

 

[minh-thanh]

Thanks retailer !
Hi All !
I have a question, can I use flywheel size of V2 engine for V4 engine ?
Thanks .

 

[Cogsy]

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]

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 :

 

[minh-thanh]

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

 

[Cogsy]

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]

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]

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.

 

[minh-thanh]

Thanks Cogsy , stevehuckss396 , bluejets !

I have seen some information in:
https://en.wikipedia.org/wiki/Firing_order

And

I choose the direction of the flywheel as shown in the picture because it will help me to easily start the engine with a hand drill, so is the cylinder numbering true ?
Thanks !

 

[Cogsy]

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.