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Topic Review (Newest First)
12-15-2003 07:33 AM
Tech @ BG Not all liquids expand as they get hotter. Glycerin gets thinner which reduces the pressure on the internal mechanism of the gauge giving a false low reading. We see this on a regular basis with people using them under the hood on fuel pressure systems.
12-14-2003 08:59 PM
camaroman7d The liquid in the gauge should not have an effect on the reading. That liquid is there to keep the neddle steady, no bouncing or vibrating etc... I have a few liquid filled gauges on my car and I haven't noticed any difference due to tempature.
12-14-2003 08:41 PM
Jag Daddy
Quote:
The hotter the gauge gets under the hood the thinner the glycerin gets, giving you a "false" low pressure reading.
But as liquid heats it expands, some liquids expand faster than others. So I think if anything it would be slightly higher not lower

Regards
Mark
12-14-2003 08:25 PM
jimfulco
Re: Liquid Filled Gauges

[QUOTE]Originally posted by Tech @ BG
[. The hotter the gauge gets under the hood the thinner the glycerin gets, giving you a "false" low pressure reading.

Temperature of the gauge liquid should have no effect on the gauge reading, except for its effect on the actual oil pressure.
12-12-2003 07:07 AM
engineczar Nice edit 4 Jaw. lmao
12-12-2003 06:17 AM
Tech @ BG
Liquid Filled Gauges

One thing to keep in mind if you go to a liquid filled gauge. They are filled with glycerin which is heat sensitive. The hotter the gauge gets under the hood the thinner the glycerin gets, giving you a "false" low pressure reading. Make sure when you're checking the gauge in the engine compartment you do it with the engine compartment cold.
12-11-2003 09:57 PM
lust4speed Deleted. Was going to mention something, but see it was already covered.
12-11-2003 08:35 PM
jimfulco A friend of mine has one (2") under his hood, right next to the vacuum gauge.
12-11-2003 07:42 PM
Jag Daddy I called a speed shop in Torrance CA. and the tech said they sell a 100 PSI fluid filled fuel pressure gauge that will work. I think I might give it a try.

Regards
Mark
12-11-2003 07:41 PM
302 Z28 oops
12-11-2003 07:26 PM
tm454 Sorry,no name, just OIL. 100PSI gage They carry lower pressure gages, this one was a spair for my drag bike, never used till I found that spot on the sbc to install this one. Reads the same as the one on my dash off the back of the block.

Todd


Rat Rods Rule!
12-11-2003 07:09 PM
dmorris1200 Like Todd said, they've been running weatherproof oil pressure gauges on motorcycles for years. They are designed to be driven through any weather totally exposed. These are not 'test gauges'. Find out what brand Todd uses or check any bike shop that deals with Harley performance parts. You could check out a company like www.jpcycles.com to see what they offer.


12-11-2003 06:57 PM
4 Jaw Chuck If you want to leave it in place install a snubber before the gauge, it keeps the mechanism safe from pump pulsation and adds a safety mechanism in case the gauge breaks.

Of course if it snaps off at the snubber pipe fitting, your on your own.
12-11-2003 06:45 PM
Auto-Part
Quote:
Originally posted by Tech @ BG
There are many companies that make small 1-1/2" test gauges. The problem you're going to run into is these are "TEST" gauges, they are not designed to be left in place. They have very small springs, and parts inside which do not hold up well with vibration. Most speed shops will keep 100PSI test gauges in stock.
Like I said go to walmart buy their oil gauge and install it any where under the hood. Now go back to sleep
12-11-2003 01:18 PM
Tech @ BG There are many companies that make small 1-1/2" test gauges. The problem you're going to run into is these are "TEST" gauges, they are not designed to be left in place. They have very small springs, and parts inside which do not hold up well with vibration. Most speed shops will keep 100PSI test gauges in stock.
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