Howdy guys

The other day i saw an ad to stroke a h22 to 2.6 liters. I knew that was a good thing, but i didnt understand HOW it was a good thing, so i was wondering if you guys could help me out here.

1. How is the displacement of a motor calculated?

2. What is rod and stroke ratio?

3. How does a stroker kit increase displacement?

Any help is greatly appreciated. Thanks in advance guys!

 

lol..nice screen name...

 

1. bore x stroke x # of cylinders

2. exactly what it implies

3. it increases the strole and therefor overall displacement

 

More specifically, dispacement = pi(3.14) x bore x stroke x # cylinders. So the longer the stroke, the larger the displacement.

Rod ratio is lenth of rod/lenth of stroke. Bigger rod ratios are better due to the rod angling less as the crankshaft rotates. The height of the block limits how long a rod can be used before the piston falls out the top. Some builders will weld spacers to the top of the motor to allow longer rods or longer stroke. Rod ratio is really only important for the last few % of possible power with a given motor design. Many stock hondas have a "bad" rod ratio as built but rev higher and make more power than other motors with "good" ratios. It does matter, but only when everything else is at the limit will it be noticable.

Longer stroke = higher piston speed. For a given rpm the piston has to travel from all the way down to all the way up in a set time. The longer the stroke, the greater the distance in the same time. It therefore has to go faster to do it. The higher the piston speed, the greater chance of parts flying apart.

 

Wow, thanks so much guys. Finally, all of those questions have been cleared up, thanks again!!!