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Bob, I only have one. If Brant doesn't take it, I'll make a pigtail for it to work with the AIM dash. I need to call PMNA and see what it is worth. Here is a diagram to show how it is wired up
I'm assuming it is looking at rings as high pressure is bad. Here is a snapshot of an alarm we used on a Grand Am Car. PMNA replaced one of our engines due to high crankcase pressure after 5 hours on a rebuild. I don't know the limit they used but we changed the engine (hot) between practices and it was due to low power and high crankcase pressure.
I shipped the sensor today with a harness to connect to AIM. I'll work with you to configure the dash and build a custom table for the sensor.
For those wondering about the function of the crankcase pressure (CCP) sensor, I asked PMNA for some clarification.
CCP is measured from "absolute zero". This means that the crankcase sitting still, not running will be at 15 psi (one atmosphere). PMNA says that the case runs with a vacuum in it and if the pressure gets above 11 psi (that would be minus 4 psi on a real pressure gauge) for a prolonged period while running above 4500 rpm, there is a chance that the rear seal might leak. PMNA says the normal range should be 4.5 to 6 psi (again, this is really a 8 to 10 psi vacuum).
I have quite a bit of data from cars with CCP sensors and they all seem to run in the 7 to 9 range so I'd take the 4.5 to 6 with a big grain of salt!
I do think that this might be a good tool to monitor changes in the engine as the hours build up.
I'll bet you can talk John and Ed (http://www.demonspeedmotorsports.com/) to make this kit at a much better price. The only expensive part is the pressure sender, which PMNA sells for $340.44. I found sensors on the internet (similar) for a little over 100 bucks. The rest of the parts are straight forward except for the piece that goes in the engine which would need to be made, but looks easy.
Looking at the pictures above, I'm trying to determine exactly WHERE the sensor will plug into the engine. After looking at the PET for my 2001 Cup and also looking at a 2003 Cup PET, I am making an educated guess (so 2+2 = 12, right?!) here. It would seem that the sensor plugs into the 4-5-6 (right side) Cam Housing cover where PET shows a deactivated Hall sensor. In the attached page from PET, that looks to be item #12, referred to as a deactivated Hall Sensor.
Am I thinking about this correctly? Thanks one and all. Since my engine now has 60-70 hours on it (approximation), I think I need to start monitoring crankcase pressures BEFORE something goes BOOM!
06-18-2014, 09:10 AM
Crankcase pressure sensor.
