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Rallye Oil Pressure Gauge #584019 01/16/10 07:19 AM 01/16/10 07:19 AM
Joined: Nov 2009 Posts: 520 New Zealand nz383man OP mopar
nz383man OP mopar Joined: Nov 2009 Posts: 520 New Zealand	This may be of some interest to anyone that has a Rallye dash. I was interested in the calibration of the oil pressure gauge in my '70 Barracuda so I checked it out & found what you see below. Using an air regulator on the oil pressure sender I started at zero pressure & worked my way up as far as the compressor would go. The gauge did not register at all at 17 psi then at 18 psi the needle went up to the mark as shown below, the needle wasn't stuck it did the same thing every time I tested it. Winding up the regulator gave the pressures indicated below but I didn't have enough air pressure to get a reading for the top mark. Gauges will vary but it gives an idea what pressure you are running.

Re: Rallye Oil Pressure Gauge [Re: nz383man] #584020 01/16/10 08:39 AM 01/16/10 08:39 AM
Joined: Feb 2005 Posts: 283 N.E. England Roppa440 super street
Roppa440 super street Joined: Feb 2005 Posts: 283 N.E. England	Funny enough I was thinking of fitting an extra mechanical gauge so I could see what pressure my dash gauge was actually registering. My needle sits about half way up so I doubt I have any problems. But I always wondered what it was actually reading. 2002 Chevrolet Corvette 5.7 LS1 2011 Alpha Romeo Giulietta Veloce 1.6 JTD Because running a Mopar in the UK is getting TOO expensive!!

Re: Rallye Oil Pressure Gauge [Re: nz383man] #584021 01/16/10 02:56 PM 01/16/10 02:56 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: This may be of some interest to anyone that has a Rallye dash. I was interested in the calibration of the oil pressure gauge in my '70 Barracuda so I checked it out & found what you see below. Thanks for the post. I always wonder how off my factory gauges are. I'll probably settle for a top of the line electrical. I've never had a leak (yet) on my new carpet or from any mechanical gauged vehicle I've owned but I dont like the thought of it possibly happening. live every 24 hour block of time like it's your last day on earth

Re: Rallye Oil Pressure Gauge [Re: nz383man] #584022 05/06/11 03:48 PM 05/06/11 03:48 PM
Joined: Jan 2003 Posts: 5,439 So Cal Sinitro master
Sinitro master Joined: Jan 2003 Posts: 5,439 So Cal	Keep in mind.. The OE gauges including the oil pressure run off the 5V voltage limiter. The voltage limiter has a +/-10% tolerance, 4.5V-5.5V so the gauge will vary as the input voltage varies. Plus the sending unit has a tolerance as well, to know more precisely one should pipe in a mechanical and then cross-check.. Just my $0.02..

Re: Rallye Oil Pressure Gauge [Re: RapidRobert] #584023 05/06/11 07:13 PM 05/06/11 07:13 PM
Joined: Jun 2009 Posts: 1,212 QLD Australia Keith Black® pro stock
Keith Black® pro stock Joined: Jun 2009 Posts: 1,212 QLD Australia	Quote: Quote: This may be of some interest to anyone that has a Rallye dash. I was interested in the calibration of the oil pressure gauge in my '70 Barracuda so I checked it out & found what you see below. Thanks for the post... thanks -------------------------------- Darren Beale Keith Black Racing Engines®

Re: Rallye Oil Pressure Gauge [Re: Keith Black®] #584024 05/06/11 07:36 PM 05/06/11 07:36 PM
Joined: May 2005 Posts: 4,704 Florida BDW master
BDW master Joined: May 2005 Posts: 4,704 Florida	Thx, good info!

Re: Rallye Oil Pressure Gauge [Re: BDW] #584025 05/06/11 07:51 PM 05/06/11 07:51 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	When I first started my new engine I ran a mechanical guage along with the rally guage. Readings were similar to the OP's experience. But boy was the ralley guage slow. The mech guage would show some pressure during cranking and jump right up as soon as the engine fired. It seemed like the rally guage took 5 minutes to catch up. I don't know if they all do or if my new parts store sender is just slow?

Re: Rallye Oil Pressure Gauge [Re: ahy] #584026 05/07/11 07:49 AM 05/07/11 07:49 AM
Joined: Nov 2006 Posts: 319 Northern Va M Mopar73340 enthusiast
Mopar73340 enthusiast M Joined: Nov 2006 Posts: 319 Northern Va	Thanks for the post. As said above, the factory guages are all slow and I don't know if any 2 are the same as I have 2 E-Bodies with the rallye guages and both read different with the same basic oil psi. For anyone interested, I run an Electrical VDO oil press guage and it reacts quickly. If you didn't see the wires you wouldn't know it was electric by the speed at which it reacts.

Re: Rallye Oil Pressure Gauge [Re: ahy] #584027 05/07/11 09:01 PM 05/07/11 09:01 PM
Joined: Jun 2008 Posts: 1,822 Colorado D denfireguy top fuel
denfireguy top fuel D Joined: Jun 2008 Posts: 1,822 Colorado	Quote: When I first started my new engine I ran a mechanical guage along with the rally guage. Readings were similar to the OP's experience. But boy was the ralley guage slow. The mech guage would show some pressure during cranking and jump right up as soon as the engine fired. It seemed like the rally guage took 5 minutes to catch up. I don't know if they all do or if my new parts store sender is just slow? The rallye dash gauges are slow due to their design. Current from a constant voltage source flows into the gauge. The other end of the gauge goes through the sender to ground. The gauge itself is hooked to a bimetalic strip. Current flows through the strip causing it to heat up. Because of the dissimilar metals, the strip bends because one metal expands at a different rate and distance than the other. The bending metal moves the pointer, the distance dependent on the amount of current and heating of the strip. Very, very simple and very easy to manufacture. And very slow to react. Mechanical gauges are much quicker and more accurate. They cost an order of magnitude more to manufacture so they were not used by manufacturers. Craig 2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado

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