what does "stroker motor" mean exactly? - BMW M5 Forum and M6 Forums
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post #1 of 25 Old 2nd July 2008, 09:55 AM Thread Starter
avi8tir
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what does "stroker motor" mean exactly?

dumb question, Im sure. but whats it mean exactly?

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post #2 of 25 Old 2nd July 2008, 10:19 AM
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Arrow To put it simply........

Quote:
Originally Posted by avi8tir View Post
dumb question, Im sure. but whats it mean exactly?
This is over simplified, but basically shorter rods are used to connect crankshaft to pistons; creating a longer downstroke of piston inside cylinder. This increases cylinder volume; which allows more air/fuel; which increases power output.

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post #3 of 25 Old 2nd July 2008, 10:42 AM
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post #4 of 25 Old 2nd July 2008, 11:09 AM
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An engine's displacement ( or sise) is dependent on the bore and the stroke of the cylinders (also the number of cylinders, of course). Bore is the diameter of the cylinder and stroke is the distance traveled by the piston.

To increase displacement, you can increase the bore by reaming out the cylinders and fitting new pistons. You can also replace the crankshaft to increase the stroke. This generally requires new pistons and new connecting rods. as well. You can also do both, so the engine is "bored and stroked"
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post #5 of 25 Old 2nd July 2008, 11:26 AM
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An engine's displacement ( or size) is dependent on the bore and the stroke of the cylinders (also the number of cylinders, of course). Bore is the diameter of the cylinder and stroke is the distance traveled by the piston.

To increase displacement, you can increase the bore by reaming out the cylinders and fitting new pistons. You can also replace the crankshaft to increase the stroke. This generally requires new pistons and new connecting rods. as well. You can also do both, so the engine is "bored and stroked"
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post #6 of 25 Old 2nd July 2008, 03:43 PM
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post #7 of 25 Old 2nd July 2008, 04:56 PM
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You can still control compression....by the surface of the top of the piston.....either concave.....or a "Flattop" or a raised surface....how much of these determines how much or little compression

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post #8 of 25 Old 2nd July 2008, 05:09 PM
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Fascinating thread

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post #9 of 25 Old 2nd July 2008, 05:47 PM
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Cool!

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post #10 of 25 Old 2nd July 2008, 05:57 PM
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in the case of the s85 motor you guys are all wrong. stroker means you're getting stroked if you think a little more than 100hp is worth over $40k!!!
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