is this right?

[GreyGoose006]

is this the way a stroked engine is created?
ignore my horible illustrations, you get the point.
seems logical to me...



note:
1 is stock
2 is "stroked"
not to scale

[534BC]

Yes.

PS look out for skirt to counterwieght clearance. lol.

[GreyGoose006]

Originally Posted by GreyGoose006

Not to scale

like i said...

[curtis73]

Yep, that's the exact concept. Often times the difference is only a 1/4" of stroke, so its often possible to keep the same rod length by moving the pin position up in the piston. Sometimes you can even add rod length to help counteract the additional side loads created by the longer crank.

You have the concept down exactly.

[curtis73]

Here is what I'm talking about with the stroker crank being able to use the same length rod. My drawings are kinda crappy too, but these both have the same length rod, just the pin is higher in the piston.

[TheSilentChamber]

Makes me horny just looking at it.

[GreyGoose006]

Originally Posted by curtis something-or-other

Here is what I'm talking about with the stroker crank being able to use the same length rod. My drawings are kinda crappy too, but these both have the same length rod, just the pin is higher in the piston.

i know you can do it that way, but it seems that it would interfere with the seals on the piston (rings maybe)

[GreyGoose006]

wouldnt a longer rod provide more levewrage tho?
if the pin is moved up, you have to make sure you dont have rod angles that are too high.
w/ a longer rod, it is easier (it seems) to keep rod angles in check

-edit:
shit, i meant shorter rod.
sorry

[GreyGoose006]

wait. never mind.
i'm confusing myself now.
ignore previous post

[curtis73]

Yes, the longer rod can interfere with the rings, but you can cut the pins so that they don't interfere. The debate of longer vs. shorter rods has many sides and they both have their benefits. Longer rods have the benefit of a little more reliability and stability at high RPMs, but shorter rods can make a few extra hp.

[GreyGoose006]

is that due to the fact that a smaller lighter rod can rev higher?

[TheSilentChamber]

It has to do with rod/stroke ratio. If you do a little searching, as curtis said this is a never ending debate, most will agree (happily or not) that the "idea" r/s is 1.75ish.