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How To Get More Torque |
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Jul 31 2008, 02:58 PM
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Full Member
 
Group: Members
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Joined: 23-June 08
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Location: Huntington Beach CA
Drives: 1996 Mitsubishi Eclipse RS 5-speed

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Stroking the engine means to increase the size of the engine through the stroke.
Such as, on the 420A, the stroke is 83 mm. Stroker kit gives you another 3-5 mm, which in turn, makes the 420A's 1996 cc displacement into a 2068 cc, if I did the math right... on a 3 mm gain.
Usually the only thing involved in a stroker kit is connecting rods and the crankshaft I think...
This is different than doing the bore, in which you would need larger pistons. Although, some people use the terms "Stroked engine" and Overbored engine" interchangably, because, I assume, they have performed both operations...
At least, all this information is to my understanding, and it may be completely off, as I have no actual engine experience, just studying... :(
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Aug 1 2008, 08:46 AM
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Bleeds black and gold

Group: Admin
Posts: 6,030
Joined: 2-January 06
Member No.: 19,248
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Location: Lancaster, PA
Drives: 1996 Talon AWD. Built, but no longer drives: 1997 mitsubishi eclipse RS; 1990 Talon AWD; 1995 Talon AWD, 1997 Talon AWD. Seems like a pattern

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QUOTE(MadHatterEvo @ Jul 31 2008, 02:58 PM) Stroking the engine means to increase the size of the engine through the stroke.
Such as, on the 420A, the stroke is 83 mm. Stroker kit gives you another 3-5 mm, which in turn, makes the 420A's 1996 cc displacement into a 2068 cc, if I did the math right... on a 3 mm gain.
Usually the only thing involved in a stroker kit is connecting rods and the crankshaft I think...
This is different than doing the bore, in which you would need larger pistons. Although, some people use the terms "Stroked engine" and Overbored engine" interchangably, because, I assume, they have performed both operations...
At least, all this information is to my understanding, and it may be completely off, as I have no actual engine experience, just studying... :( [right][snapback]188735[/snapback][/right]
dead on,, except technically speaking it doesn't increase the "size" of the engine, it increases "displacement" of the cylinders. a good example is watering your garden with a 5lb bucket(cylinder). You can water the garden just fine but it will take more trips back and forth to the hose (rpm) to be efficient. If you increase displacement to a 6lb bucket(cylinder) you can fit more water in there and will take less trips to the hose (rpm) but since the bucket is heavier you run out of efficiency at higher rpm. same with your engine but a little more complicated. a 2.0L will give you more power at higher RPM(where horsepower is measured) because it makes more trips and the bucket is lighter so it is more efficient when making faster trips than if you were to increase the stroke and displacement to a 2.2L. This will give you more power at lower rpm(where torque is measured) but can't build as much power at high RPM because the bucket is heavier and is less efficient when making faster trips. does that make sense?
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Aug 4 2008, 02:48 PM
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Bleeds black and gold

Group: Admin
Posts: 6,030
Joined: 2-January 06
Member No.: 19,248
Status: 
Location: Lancaster, PA
Drives: 1996 Talon AWD. Built, but no longer drives: 1997 mitsubishi eclipse RS; 1990 Talon AWD; 1995 Talon AWD, 1997 Talon AWD. Seems like a pattern

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QUOTE(fullmoon @ Aug 2 2008, 10:03 AM) Correct me if I'm wrong but is that's where the stroke kit comes into play for the high RPM's by increasing the up and down motion of the pistons available space. And the kit don't increase compression or does it? I thought that's where the HC pistons come into play? :blush-anim-cl: [right][snapback]189420[/snapback][/right]
In terms of n/a, you have to "de-stroke" an engine if you want it to work at higher RPMs. try this, make fists with your hands. punch back and forth as far as you can and as fast as you can. now, punch back and forth as fast as you can about 6 inches. Which one did your arms go faster, the longer stroke or the shorter stroke?
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