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Nov 13, 2012 | 07:16 PM

#21

63mako

Race Director

Joined: May 2005

Posts: 10,674

Likes: 122

From: Millington Illinois

St. Jude Donor '08-'09

Quote:

Originally Posted by Matt Gruber

mako
so what roller has steeper ramps than the xe262 with a 44 ramp rate/hyd intensity? around 218-220 at .050
how does the xe262 use a single spring 110 seat 285 over the nose? I've looked at small roller cams and they always seem to have LAZY ramp rates. Yet require more spring.

The comparison of advertised duration and duration @ .050 between a flat tappet and a roller is deceptive. If you look at the advertised duration and duration @ .400 you would get it. Here is a photo that will help explain it. These two cams have the same advertised duration. Look at the lobe design and imagine the difference at duration @ .400 lift.

Lift, duration @ .100, .200, .300 and RPM capability also contribute to the need for stronger springs. Rollers always need stronger springs due to the heavy lifters.

Nov 13, 2012 | 08:15 PM

#22

Tim H

Safety Car

Joined: Oct 2000

Posts: 3,593

Likes: 103

From: Southern Indiana

Quote:

Originally Posted by 63mako

Sorry if my post is too difficult for you to comprehend. Basicly it says your statement about thumper cams beating your valvetrain to pieces is

: and explains why in basic terms.

Its not too difficult to comprehend, its just "wow and flutter" useless information that if any one used to pick out a cam there would be no such thing as a lopey cam.
You can E=Mc2 all day long but while your wearing out a pencil I have installed several cams and know what works from experience.
There is an old saying that fits you dyno room table toppers.
And I quote: " those who can, do, those who can't, teach."
and that applies to all your piles of note book gibberish.