ZeRo

i'm fairly new to cars but i've been learning and researching on my spare time and i got to the topic of bore/stroke engines and what i've foung out is that an oversquare(short stroke) engine has more bore than storke and is very reliable but gives out less torque and that an underquare(long stroke) engine has a higher stroke than bore and wears more frequently due to the high strain on the crankshaft but gives more torque. my question is what happens when u have a square engine where the bore and stroke are equal. i've been trying to find out but can't seem to find the answer anywhere.

lautinjr

Bore and stroke are never equal it's 2 different things. Bore is cylinder diameter. Stoke is the distance the piston has to travel on a revolution. Long stroke motors are under more stress but have more durable ctrank shafts. IE my engine is the long stroke small bore model compared to it's counter part but my crank is 30% larger then it's counter part giving it 30% more area for larger bearings to deal with the heavier strain. Egineers think of this stuff for ahead of time.

IE
2.3L
Bore 92mm stroke 85mm
My 2.4L
Bore 90mm stroke 94mm

I think your saying what if I took my 90 bore and increased it to 94mm to match the stroke well I would destroy th block because there isn't enough meat to machine that for, but a common on is to take the 2.3L and stoke it meaning to use the 2.4L crank so now I have the 92mm bore with the 94mm stoke. This takes major modification and machine work, but can be done if you bore it another .4 over then you have a 2.6L stroker motor.

Ultimatly you have to give and take yes they could match say 94mm to 94mm but it wouldn't really accomblich much that would give me a slow reving engine with lots of low end power and i'm running a sports car not a pickup.

I probably made your question worse not better sorry.

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ZeRo

k at the beggining u said there is no such thing as same bore and stroke but im talking about a ratio and like http://en.wikipedia.org/wiki/Stroke_ratio this is the website where i looked at stroke ratio and it said if the ratio is 1 its a square so im just a lil confused about that part i understand the rest

Armadi110

Yeah it is possible to creat a square engine as wikipeida says:
Im sure it has its advantages/disadvantages, but to fully understand that may require a good indepth engineering education lol, you may be better off asking a Mechanical Engineer as most mechanics probably wouldnt be able to tell you

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lautinjr

I miss under stood the question I would imagine it woujld be a middle reving motor wih decent power and torque nothing special on either side.

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ZeRo

well cuz ive looking at buying a car and i came to the conclusion that im going to get a mitsubishi lancer and it has 168 hp and 167 lb of torque and its engine is a 2.4L engine with a bore and stroke of 88mm so i was just checking if the whole square engine thing is good or not cuz i dont want to buy a car and later on find out that its not that good

Gandalf

Yeah, like Lautinjr said, it's a "jack of all trades, master of none" kind of deal.

And are you thinking the Lancer Evo, or just a plain lancer?

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ZeRo

just a plain lancer 2009/2010 gts

tomkevin4u

you simply visit sites and ask question. they will answer for you