Stock, Stroker, Destroker, what does it all mean???

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Stock, Stroker, Destroker, what does it all mean???

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Mitsubishi >> Mitsubishi Models >> Mitsubishi Evolution >> Evolution Frequently Asked Question Section >> Stock, Stroker, Destroker, what does it all mean???

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Stock, Stroker, Destroker, what does it all mean??? - 1/31/2007 9:28:43 PM

EMonz57

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A lot of times people throw aournd the words stroker and destroker without really knowing for sure what they mean. Well, now you'll know...

For a better understanding of how these motors work...

A STOCK 4G64 has an 86.5mm bore and 100mm stroke

A STOCK 4G63 has an 85.0mm bore and 88mm stroke

The bore is dictated by the piston/block selection. A motor can be bored out 0.5mm safely, but I wouldn't go beyond that for the sake of sleeve thickness.

The stroke is dictated by the crank. The cranks are interchangeable between the two motors.

For reference... there are 1000mm^3 (cubic millimeters) in 1cc (cubic centimeter). There are 1000cc in 1L (Liter). Therefore, there are 1000000mm^3 in 1L.

Stock 4G64:

Lets do some math...

An 86.5mm piston has a cross sectional area of ~5877mm^2 (pi * radius^2), times 4 pistons is ~23508mm^2, times 100mm stroke is ~2350800mm^3 which is ~2.35L or 2.4L. That is how a 4G64 is considered a 2.4L motor.

Stock 4G63:

An 85mm piston has a cross sectional area of ~5675mm^2, times 4 pistons is ~22700mm^2, times an 88mm stroke is 1997600mm^3 which is 1.99L or 2.0L, pretty simple, right?

To STROKE a 4g63 you put a longer stroke crank in it. A 100mm crank from a 4G64 has a 12mm longer stroke than the stock crank.... do the math again.

4G63 STROKER:

An 85mm piston has a cross sectional area of ~5675mm^2, times 4 pistons is ~22700mm^2, times a new longer 100mm stroke is 2270000mm^3 which is 2.27L or 2.3L. So to get a 2.3L stroker, you must install a 4G64 crank into a 4G63 block.

You CANNOT DEstroke a 4G63 because there is no shorter stroke crank readily available!

You CAN DEstroke a 4G64 with a 4G63 crank! Do the math again....

4G64 DEstroker:

An 86.5mm piston has a cross sectional area of ~5877mm^2, times 4 pistons is ~23508mm^2, times a SHORTER 88mm stroke is ~2068704mm^3 which is ~2.06L or 2.1L. So to make a DEstroker, you must use a 4G64 block with a 4G63 crank

Why do this?? The destroker is essentially a 4G63 with a taller deck height (read: londer rods decrease the rod angle creating less cylinder side loads = higher RPM tolerance) and punched out 1.5mm for a bit more displacement.

Borrowed from NE-Evos.net written by: SuperHatch

< Message edited by EMonz57 -- 1/31/2007 9:30:23 PM >

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