Stroker Crank
- Thread starter jcs003
- Start date
swazi_matt
Active member
WHat is a stroker crank? Tried google but not sure it is giving me the right answers
Anders
Gold Level Site Supporter
Its a crank with a longer than "normal" stroke.
Zman
Platinum Level Site Supporter
I believe you can weld the existing hole and use the stock size pin. Stroker cranks need to be rebalanced to prevent bad vibes.
Big bore kit is another option.
swazi_matt
Active member
does that not increase the compression?
What are the benefits of this mod over just ensuring proper squish or modifying the head (insert) to increase the compression?
Anders
Gold Level Site Supporter
This is a trick mostly used in forstrokes to increase the capacity, like boring out the cylinder. Whether you select to bore or to stroke (or both) would depend on how you want your engine to perform.
You would have to raise cylinder to bring the compression down to normal, often done by placing a spacer under the cylinder. But on a twostroke, a stroker crank would also lead to changes in the port timing, making it more difficult to just add a spacer.
RBrider
Gold Level Site Supporter
There's a engine builder in the PNW that builds 2 stroke strokers, but for the life of me can't think of his name. I believe someone on this forum has a long stroke GG done by this person. Maybe in the Chicago area.
RB
(F5)
Gold Level Site Supporter
Ive only destroked cranks, but for racing racing class reasons. Square stroke to bore is best on a 2 stroke for a given cc but more is easy increase. A spacer above and below are often required but you have to look holistically.
My CPI barrel and matching crank on my RZ350 adds 7mm stroke but was designed to have right port timing so extreme example.
My CPI barrel and matching crank on my RZ350 adds 7mm stroke but was designed to have right port timing so extreme example.
