Lengthening the R/S ratio slows the speed of the piston around TDC, and increases it around BDC. How can this affect power? In a nutshell ...

When the piston moves faster around BDC, that makes the ideal closing point of the intake valve (the single most important valve timing event) come quicker. So, changing R/S significantly indirectly changes cam timing with respect to piston position.

When the piston moves slower around TDC, that has the effect of increasing the resolution of ignition timing at higher rpm. This is desirable because the piston moves faster than the flame front.

What does this mean in the big picture? I believe it was GM engineers that demonstrated that any change in R/S ratio <5% or so made no discernable difference in power in clinical settings.

FYI

 

Can you guys go over a brief explanation of what exactly the Kiggly Pressure Regulator does and if it's essential in this build? I haven't come across much information on people using it. This is for oil in the head correct?

-Acree

 

From my understanding (which isnt that great) it regulates the oil in the head, which will keep more oil in the pan, which is better for the bearings. The head only require 15psi of oil or w/e it is, and this will help keep the bottom end with plenty of oil. in a nutshell. somewhere in here there is a link to a thread on it. Ill try finding it for you.

 

ya it just limits to how much oil goes into the valve cover.... it seems like a good investment and should assist with blow by and etc.

 

i have to find your post you told me the reason to not get it.

 

that was in PM! I basically said its not really a necessity if you're just building a car to do an occasional pull and not slamming gears on a daily basis at the track in high rpm's. For you, id say you probably wont benefit from it, for me.... i benefit from it.. i slam gears everyday (on the street). It has helped with my blowby in my buschur motor as well.

 

i might pick one up now

 

Is there anyone using the Kiggly regulator and still running the turbo oil feed from the head?

 

Yeah, all of us here. It limits above that feed not before.

 

Thanks for clearing that up! I'm definitely going to grab one now.

PS: are you, Mikey, Lucas, or anyone else running any type of modified oil pan or pickup to fight starvation issues during launching or acceleration?

 

We run AMS pans for the most part. Right now since I am not drag racing I pulled it off and have a stocker on it since I dont really need it too much. If I go back to drag racing the car I'll put an AMS back on or modify my stock pan and pickup. For the time being running a 1/2 quart extra seems to be working.

Aaron

 

How exactly does the kiggly regulator do its job?

 

It presents a restriction in the oil feed to the head that results in more consistent pressure at the bottom end, and keeps more oil in the sump as opposed to pumping an excessive amount to the valvetrain.

 

from what i read, it reduces oil to the lifters only. everything else like the cam feeds is the same.

 

keeps the oil from pooling in the head the neons had the same issue.