Maximum Torque Specialists Cadillac Forums  

Go Back   Maximum Torque Specialists Cadillac Forums > Cadillac Tech > Engines

Engines All things technical about Cadillac engines.

Thread Tools Display Modes
Old 10-24-2014, 06:39 PM   #1
mechanical rebellion
Join Date: Jan 2011
Location: I a world ...... of SHHHHIT !
Posts: 42
Default Cam & oprt flow question

A port will only flow so much no matter how much lift a cam has . So at what lift on a 76cc head does a port no longer get the benifit from alot of lift (did I say that right ?) . And does piston speed come into play , as in does the cylinder get more volume of air when piston speed increases downward ? I want the most effective lift with the least amount of stress on the valve train . Thanks
mechanical rebellion is offline   Reply With Quote
Old 10-26-2014, 09:58 AM   #2
Senior Member
Join Date: Mar 2006
Location: The Seasonally Frozen Wastelands
Posts: 439

Even if the port stalls at higher lift, the peak lift is of short duration. Adding lift increases "area under the curve" so overall flow improves.

Question should be how much duration can you accept; the lift pretty well follows the duration. Duration and overlap can make a mess of low-rpm driveability; or destroy upper-rpm power. Pick your duration and overlap, pick your cam type--flat-tappet or roller tapppet, etc, and the lift is mostly decided for you with minor differences.

Given a choice, a GOOD FLOWING port mated to a mild cam makes for a much nicer engine than a crappy port and a big cam.
Schurkey is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -7. The time now is 02:32 PM.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.