Performance Trends, Inc.
Producing Quality Computer Tools for Racers and Engine Builders since 1986
Re: Performance Trends Newsletter (updates)
To: Visitors to Performance Trends Website
Subject: Product News/Updates, April 2025
Re: Performance Trends Newsletter (updates)
To: Visitors to Performance Trends Website
Subject: Product News/Updates, April 2025
to
visit our www.performancetrends.com
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1) Track Tech Inspectors - Quick Cam Checker: Racing season is here and you track tech inspectors may be interested in this. Our Quick Cam Checker is designed to give you a quick idea of the cam in the engine while it is in the car. Install some sensors and spin the motor over with the starter and you have a good idea how big the cam is. Well, track tech inspectors got wind of it and adapted it to teching engines after a race. The largest sales have been to techs for the GM 602 and 604 "sealed" crate motors.
Standard Quick Cam Checker System
Special 602/604 Bracket for Lift Sensors
Chad Smith, a licensed IMCA tech inspector, was good enough to share many of his data files and experience with us. Here's some screen captures from Chad's results with some explanations. Note that some records were not of 604 Crate Motors, and have been crossed out in blue in the table. We have also shrunk down the first column with "Record" names like engine #, racer name, etc to protect people's privacy. Typically this column is wider to display it's info clearly.
click image to enlarge it
With his experience, Chad developed his own 604 Baseline from one of his tests, run #12. He said it agrees better with other legal engines he's tested than the 604 baseline provided with the Quick Cam Checker software. Here's a graph comparing his Baseline to the 604 Baseline provided in the QCC software. You will notice his Baseline's lift is slightly less and both lobes are slightly retarded.
click image to enlarge it
Here's 3 typical comparisons of cams that passed tech inspection (the red and blue graphs) graphed over his typical baseline in black. The first graph shows where the Run Number is so you can refer to the table if you want exact durations, lifts, centerlines, etc.
click image to enlarge it
click image to enlarge it
click image to enlarge it
Here are 2 graphs for a cam that did not pass tech inspection. These are 16 and 17 in the table. Runs 14 and 15 were also done of this same cam. The cam was pulled and tested on a complete cam test stand and verified to be out of spec, and the racer disqualified.
click image to enlarge it
click image to enlarge it
Runs 9, 10, and 11 of another engine raised some eyebrows, but not to the point of pulling the cam for further testing.
for more info on
our Quick Cam Checker.
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2) New Tech Video We're always getting emails and phone calls asking for general tech help with a program. Most all these questions can be answered in our User Manuals, but these are quite big. We've just published a youtube video that shows how to quickly find key words in the PDF version of the User Manual, either in the program or on our website.
to watch this new video.
for our youtube page.
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3) Last March's Newsletter Here are the topics covered in our previous newsletter. If you would like another copy of March 2025's newsletter (or any previous newsletter) for detail on these topics, visit our website at: Performance Trends Newsletters
Performance Trends reserves the right to discontinue, update, or modify its product line and pricing at any time.