Rusty Shackleferd

Whats the rocker ratio for b series vtec? Ive searched and couldnt find anything if anyone has a link with that info i would really appreciate it.
Ive been thinking about using the crane roller followers and was wondering if the rocker ratios were close between the two. Thanks again

SuzukaBlueAP2

Should be a standard 1.5 for B18, B18, B16, etc.

I didn't know Crane, let alone anyone, made roller rockers for our engines. Do they make a cam that works with them?

Also, what are you trying to achieve by changing the rocker ratio?

If you increase it, you might get .0030" increase in lift on that valve, and just a hair sooner opening time. Is that what you're trying to achieve?

***EDIT***

Thought I'd do a little more reading into roller rockers for Honda engines...and came up with this:

A Prototype set made:
Prototype Racing

And for those who aren't sure what a "rocker ratio" is...thanks to Turbo magazine, they've got it all diagramed out for you on how to read a Cam Card.



A: Intake & Exhaust Duration: This is measured in degrees of how long the valves are open. This number is rated at the camshaft and end result will be the same at the valve.

B: Intake & Exhaust Lift: This is measured in inches and in most cases this number refers to the valve lift and not cam lift. Valve lift is the measurement at the valve side of the rocker arm. This number is a calculation of cam lift with rocker ratio figured into the equation. (See D rocker ratio)

C: Intake & Exhaust Clearances: This is the recommended valve lash for these particular cams. The measurement is given in inches and the card explains that measurements should be done with the engine cold.

D: Rocker Ratio: The rocker ratio is the proportional relationship between measured lift at the cam and measured lift at the valve based on a rocker arms fulcrum point.

E: Duration @ .050: This is the U.S. standard of measurement. U.S.-spec cams are measured at .050 thousands of an inch.

F: Lobe Lift: This is the actual lift of the cam without the rocker ratio calculated into the equation. Cam lift is figured by measuring the cam from the tip of its ramp to the bottom of the base circle. Then measuring the base circle and subtracting the base circle measurement from the tip-to-base measurement.

G: Lobe Center: This is also referred to as lobe separation angle. Lobe center is measured in degree comparisons between the intake lobes and the exhaust lobes from the center of the camshaft. Since most imports are DOHC this number can be tailored with the use of cam sprockets. DOHC engines have two centers because of the use of two cams. Since changing the degrees on the cams can widen or shorten the lobe separation angle this number is often ignored. On single-cam engines this number is fixed since the intake and exhaust lobes are on the same shaft

Rusty Shackleferd

Thanks man, What got me thinking about these roller followers is the K series heads. I want to go K series but i cant afford anytime soon. Here's a pic of the roller followers if you havent seen them.

http://cranecams.com/index.php...=2017

StorminMatt

Keep in mind that this product kills VTEC and is therefore really a race-only product.