Welcome to the Corvette Forums at the Corvette Action Center!

heres a brief course on cams to get you up to speed on the concepts

theres a BUNCH of factors that must be looked at...
http://victorylibrary.com/mopar/intake-tech-c.htm
http://victorylibrary.com/mopar/cam-tech.htm
http://www.rbracing-rsr.com/runnertorquecalc.html
http://headerdesign.com/extras/engine.asp#Intake_Manifolds
http://www.bgsoflex.com/intakeln.html
http://www.wallaceracing.com/runnertorquecalc.php
http://www.mercurycapri.com/technical/engine/intake/pt.html

the calculators above will allow you to match the engines intake port length and flow rates
heres some basic rules of thumb as they say

keep the EFFECTIVE durration of the cam matched to the compression ratio so that the DYNAMIC cpr stays in the 7.5:1-8.5:1 range and the overlap matches the chart below
these are the valve timeing overlap ranges that are most likely to work correctly
trucks/good mileage towing 10-35 degs overlap
daily driven low rpm performance 30-55degs overlap
hot street performance 50-75 degs overlap
oval track racing 70-95degs overlap
dragster/comp eliminator engines 90-115 degs overlap
but all engines will need the correct matching dcr for those overlap figures to correctly scavage the cylinders in the rpm ranges that apply to each engines use range.look carefully at this chart
30228b.gif

example
http://dab7.cranecams.com/SpecCard/DisplayCatalogCard.asp?PN=114681&B1=Display+Card
here is a hot street cam that works great in many 383 camaros with at least 10.5 static cpr with 3.5-4.1 gears
now the timeing is intake opens 29.0 btdc, closes 71.0 abdc exhaust opens 77.0 bbdc, closes 31.0 atdc so if we add the 29 to the 31 we get the overlap duration of 60 degs of which makes this cam fall in the center of HOT STREET
youll RARELY benefit from a single plane carb intake with a cam that has less than about 230 degs durration at .050 lift, below that a dual plane carb intake works better most of the time

header primary tube size should not greatly exceed the exhaust port size

http://www.slowgt.com/Calc2.htm#Header
http://victorylibrary.com/mopar/otto-c.htm
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Advertise with the Corvette Action Center!

Double Your Chances!

Our Partners

Back
Top Bottom