Welcome to the first Isky Cams Newsletter!!
Isky is proud to announce the launch of its all-new and improved monthly newsletter! Scheduled to be sent each month to Isky Racing Cam's most valued customers, the newsletter has been designed to inform readers of recent events, monthly specials and sale items, new product releases, and the very popular monthly Tech Tips.
We hope you enjoy reading the newsletter, and please contact us if you have any feedback.
Thank you,
Nolan Jamora
Director of Operations
Isky Racing Cams |
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Tech Tip 2007
Inverse Radius Cams: Just Say No!
These days everybody wants more: Bigger, "Fatter Intake Profiles, yielding more "Area Under the Lift Curve" and Higher V.E. (Volumetric Efficiency). Some Racers mistakenly believe that a more aggressive roller camshaft requires a visit to one of the cam companies struggling for recognition, who push alternative cams with cute names like "Inverted Radius" (Actually a Re-entrant, Concave or Hollow-Flank profile Cam). Unfortunately these cams are not a wise choice considering their major drawback: the undesirable hidden side effect of reduced valve train life expectancy! Subsequently, many who purchase these cams learn to live with problems like broken or prematurely worn-out valve springs, "dropped" valves, bent pushrods, etc., unaware their valve train has been "Jerked" around by a camshaft of reduced stability at higher RPM!
These cam grinders are not however solely responsible for promoting misinformation about these so called "Inverse Radius" Cams. With the aid of the computer and the addition of new tools of the last decade or so such as the "Cam Doctor" "Audi Cam Pro" etc., Cam Profile Dynamics which were once the privy of cam designers alone can now be viewed by many others. With this new technology, there has been a new crop of "experts" who love to talk Cam Profile/Valve "Dynamics".
I am often amused by the cavalier attitude of some of these neophytes who seem to have this view when it comes to Valve Acceleration & Jerk Curves: "The more radical looking they are the better". Well, pardon me for saying so but to paraphrase conservative columnist William F. Buckley, "Ignorance Is Not A Virtue". The only time you should want your 2nd & 3rd differential curves (Acceleration & Jerk) to have greater amplitude or to have the "look and feel" of "Radical" is when you're dealing with limited RPM levels.
It is no coincidence that industrial engine production cams such as those manufactured by John Deere, Caterpillar Tractor, Allis Chalmers etc. are designed in this manner. They are low speed engines! (Have you ever heard of anyone running one to five or six thousand RPM?) They are the cams with the familiar hollow or concave flank and whenever you see one of these cams, remember: Their physical appearance is the result of their High Acceleration & Jerk Peaks and such characteristics are always associated with more moderate (not higher) RPM levels!
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ISKY NEWS
NEW FROM ISKY!!!
Introducing the new Long Slot and Roller Tip Rocker Arms for Small and Big Block Chevy V-8's. These rocker arms are ideal for high performance street, bracket racing and oval track applications.
Long Slot Rocker Arms features:
- Improved Heat Treat
- Long Slot Design prevents rocker to stud interference
Roller Tip Rocker Arms features:
- Increase Horsepower
- Reduce Tip-Rocker Friction
- Long Slot Design
- H-11 Tool Steel Roller & Pin Assembly
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ISKY NEWS (cont.)
WANTED: Cylinder Heads for Late Model Hondas
Isky is looking to expand its line of Cam and Valve Spring assembly kits for the late model Hondas. We are looking for scrap cylinder heads with Cams, Valves, Springs, Retainers, etc. intact on at least half of the cylinders.
Cylinder Heads Needed:
- LS/RS "B" Series (B-18A/B)
- VTEC "B" Series (B-16A, B-18C, or B-17A)
- VTECH H-22 Series
- Acura RSX
- HONDA S2000
If you can supply any items, please contact:
Nolan Jamora: (323) 770-0930 or NolanJamora@msn.com |
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| NOVEMBER'S BIG WINNER! |
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Cornell Robinson of Birmingham, Alabama, won a jacket, hat, t-shirt & fender covers!
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Other November Winners:
Terry Jones - Edinburgh, IN
Mathew Nicholas - Reading, PA
Robert Hung - Ontario, Canada
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** Specials listed are good from
Nov 1 to Nov 30, 2002. **
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All Roller Rockers are 10% off!
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New Product Release Offer!
All Long Slot Rockers 10% off!
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All Roller Cam & Kits 10% off!
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New Product Release Offer!
All Roller Tip Rockers 10% off!
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TECH TIPS (cont.)
These inverted looking cams will give you a slight torque increase because they will usually have 2-4 degrees less seat duration for a given duration at .050" lift. The problem occurs when you try to run such cams at up to 8000 plus RPM where they do not belong. It is simply a case of "Nada Por Nada" as they say in old Mexico. You don't get something for nothing. Those who can limit such cams to say 7000 or so maximum RPM and have appropriate valve train components won't fair too badly, but those who insist on consistently running cams like these at Higher RPM levels is "Rolling the dice" every time they does so. They should therefore not be too surprised when the dice on occasion roll "Craps".
Next month's newsletter...
Tech Tip 2008: "Does increasing rocker arm ratio increase cam duration?"
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