Homemade UTV

[Polish DIY Lover]

Hi i'm jakub and i making DIY UTV. Some questions?

[Polish DIY Lover]

By the way, what do you think about using a crankshaft made from scrap i mean crankshaft maked from steel pipes and flat bars

[Joe Breaux]

Ok,that's in English.. How would you balance it?  It would shake violently and what about the rod journals?  Don't think it's even possible. Unless you are joking

[Polish DIY Lover]

21 minutes ago, Joe Breaux said:

Jak byś to wyważył?

a protractor, a professional eye, that's enough

 

23 minutes ago, Joe Breaux said:

Trzęsłoby się gwałtownie

It depends on the engine power, torque and various other engine parameters

25 minutes ago, Joe Breaux said:

a co z czopami pręta?

you mean the bearings

25 minutes ago, Joe Breaux said:

Chyba że żartujesz

nope

[Polish DIY Lover]

I am modifying a bicycle derailleur so that it can work in a UTV

[Joe Breaux]

I think you have too much time on your hands..you want to pedal a UTV?

[Polish DIY Lover]

I will simply mount a gear to the crankshaft like the ones used in the pedals of bicycles with derailleurs

[aefron88]

home desgning an engine is a colossal waste of time, unless you're just interested in doing that for the sake of engineering. It wont make much power or be reliable without a lot of machine work and experientation. Trying to slap together a crankshaft out of scrap material without a lot of machine lathe exerience is going to be an excercise in futility. Crankshafts are extremely sensitive to balance, and straightness.

You can buy a Honda BX200 clone in the US for $100, and a centrifugal clutch that fits it for $30. that's what is commonly used in homemade gokarts. Building something bigger and more like a UTV is definitely do able with off the shelf components and a homemade frame/body. Heck a 6hp BX200 UTV is probably do-able (with a better clutch) it just wont have a very high top speed. Lots of early low CC UTV's were <20HP and stiill manage to do 30+ MPH.

[W B]

I think Jakub is from another country and the translation is losing something along the way. Jakub, Where are you from? We are all waiting for your reply.

[W B]

A derailleur is French for a sysytem "like a 10 speed" bike where you change gears.

[Joe Breaux]

Yeah,that should handle 25 HP with no problem...lol

[Polish DIY Lover]

On 13.09.2024 at 16:06, aefron88 said:

projektowanie silnika w domu to kolosalna strata czasu, chyba że interesuje cię robienie tego dla samej inżynierii. Nie da ci to dużej mocy ani nie będzie niezawodne bez dużej ilości pracy maszynowej i doświadczenia. Próba sklecenia wału korbowego ze złomu bez dużego doświadczenia w obsłudze tokarki będzie ćwiczeniem daremnym. Wały korbowe są niezwykle wrażliwe na równowagę i prostoliniowość.

Możesz kupić klon Hondy BX200 w USA za 100 dolarów, a sprzęgło odśrodkowe, które do niego pasuje, za 30 dolarów. To jest to, co jest powszechnie stosowane w domowych gokartach. Zbudowanie czegoś większego i bardziej przypominającego UTV jest zdecydowanie możliwe przy użyciu gotowych komponentów i domowej ramy/nadwozie. Cholera, UTV BX200 o mocy 6 KM jest prawdopodobnie wykonalne (z lepszym sprzęgłem), po prostu nie będzie miało bardzo wysokiej prędkości maksymalnej. Wiele wczesnych UTV o niskim CC miało <20 KM i nadal udaje im się osiągnąć 30+ MPH.

We are talking about a large engine here because it is over 600 cm3 and it could be even 1400 cm3 I don't know I didn't measure it but I doubt it would be an engine larger than 1000 cm3 in the case of the 1.0 engine I am counting on about 25 horsepower And if it is 1400 Well then I am counting on 35 but that's how I build the engine myself because I love DIY Besides I have quite limited resources and in general I gave myself such a challenge to build it from scrap and the crankshaft will be made by stabbing and welding it will be such a connection We'll see if it works

[Polish DIY Lover]

On 14.09.2024 at 02:39, W B said:

Myślę, że Jakub pochodzi z innego kraju i tłumaczenie traci coś po drodze. Jakub, skąd jesteś? Wszyscy czekamy na twoją odpowiedź.

Poland

[Polish DIY Lover]

On 14.09.2024 at 15:17, Joe Breaux said:

Tak, powinno to obsłużyć 25 KM bez problemu...lol

are you serious or joking

[Polish DIY Lover]

I'm making an oil-powered utv anyway

[Joe Breaux]

I think it an exercise in futility

[Polish DIY Lover]

On 16.09.2024 at 14:50, Joe Breaux said:

Uważam, że to ćwiczenie bezcelowe

why

[Joe Breaux]

You can't build a reliable combustion engine out of scrap metal and pipe.Prove you can by video of build and running

[Polish DIY Lover]

1 minute ago, Joe Breaux said:

Nie można zbudować niezawodnego silnika spalinowego ze złomu i rur. Udowodnij, że możesz to zrobić, oglądając film z budowy i pracy silnika.

i know how engine works but i building my own two-stroke diesel engine

[Joe Breaux]

Show us 

[Polish DIY Lover]

maybe

[Polish DIY Lover]

I can try with an attachment from my HDD or from my second backup

[Polish DIY Lover]

a piece of crankshaft

[Polish DIY Lover]

and here is a piece of the engine block and head in one

[Polish DIY Lover]

but I need to sand the inside thoroughly

[Polish DIY Lover]

my bike derailleur is already modified and ready, now I just need to mount the gears