Data Numbers (temps, RPM, etc...)

Michael Taksa

Hello again.
After my first race (Missed practice, decided to race first time out

), I decided to get a data logger/display. (My Chron2). I have EGT, Water temp, RPM, and MPH.
What are the normal/critical temeratures/RPM? Normal is to set-up for and try to stick to... Critical would be the point when motor seizes.
Thank You.

Jeff Welch

I can help with some...

We don't have EGT, so I don't know there.

Normal water temp should be between 130-140 degrees. I don't know how high the temp would go before the engine seizes, but if you go over 160, I'd make a change.

RPM depends on if you have an 80 or a 125. 13500 is normal for an 80, don't know for critical. A 125 is a bit lower, 12500-13000 maybe?

Jeff Welch
Weltek Racing

John Scott

quote:
Originally posted by Michael Taksa:
Hello again.
After my first race (Missed practice, decided to race first time out ), I decided to get a data logger/display. (My Chron2). I have EGT, Water temp, RPM, and MPH.
What are the normal/critical temeratures/RPM? Normal is to set-up for and try to stick to... Critical would be the point when motor seizes.
Thank You.

The answer to your question is motor specific, but here are some ranges.
EGT, if installed 6 inches from the piston, runs 1150-1250 F. Higher is stuck motor. Water temp 120-140 F, above 170 becomes bad.

RPM is hard since the MYCHRON gives you the peak which tends to be over-rev during a down shift. To get real useful numbers you need to down load the data to a computer and observe the real peak RPM you used. Typical CR-80 numbers are 12.8-13.2.

Hope this gets you started.

Michael Taksa

John, are you saying My Chron2 does not have "real time" RPM? That was the first reason I got My Chron, see RPM's while driving... I was going to a point of engine cutting out a few times, and thought it would not last long, so I invested in My Chron, it would be real bad if I cant look down while racing and see the current RPM

Thanks for responses BTW. I will get a set of jets next.

Tim Blaney · Joined: 18 Jul 2001 Posts: 1127

THe My-Chron 2 I have shows the RPM just fine so no worries.

Greg Maxwell · Posted: Mon Jul 30, 2001 2:43 pm Post subject: Data Numbers (temps, RPM, etc...)

Mike, What John is telling you is the MyCron shows only PEAK rpm after your run. Which was probably downshifting before a turn. It will allways show heads up full range rpm. Greg

Marc Miller · Advertiser Joined: 18 Jul 2001 Posts: 1834

The MyChron 2 shows only peak when you press the mem button, however, you can "cycle" through the data of the entire lap if you press it a few times and watch the data from that lap go by.... this should let you see if your max RPM's were under a shift point, bump or on the straightaway.

MM