Bio Posted February 10, 2010 Share Posted February 10, 2010 That is the question 🤔 Just fitted a mechanical oil preassure gauge from Think Automotive and noticed the movement of the needle going up the scale is a little jumpy. Do you need to bleed the supply pipe to purge it of air to get correct gauge operation 🤔 Great service from Think Auto and 15% off for being a club member John Link to comment Share on other sites More sharing options...
ccconn Posted February 10, 2010 Share Posted February 10, 2010 I have just done the same and mine jumps a little on the way up so maybe just the way it is...? Link to comment Share on other sites More sharing options...
Roadsport06 Posted February 10, 2010 Share Posted February 10, 2010 No need to purge the oil. BRG and Yellow nose now with added brooklands Link to comment Share on other sites More sharing options...
Bio Posted February 10, 2010 Author Share Posted February 10, 2010 Just thinking that if there is a pocket of air in the pipe going to the gauge it may be able to be compressed untill overcomming the internal resistance within the gauege mechanism. But then if the engine is not run for some days would the oil drain out of the supply pipe untill next time 🤔 A question for these dark cold evenings John Link to comment Share on other sites More sharing options...
Dyrill Posted February 10, 2010 Share Posted February 10, 2010 John I have just fitted a Stack mechanical OPG and have noticed that once the engine has cooled down the oil creeps back down the hose. So I don't think bleeding will have a significant effect. That said the gauge is smooth so perhaps the circumstance you describe is normal on the Think gauge Cheers Darren C7 SUP now with DVA K06 Upgrade Link to comment Share on other sites More sharing options...
dannylt Posted February 11, 2010 Share Posted February 11, 2010 I've fitted the Stack mech OPG too and thought about bleeding it. Seems to work fine and smoothly though, but definitely lags the Stack electronic one. I imagine the air is damping the pressure changes, so will try bleeding as much as possible. Link to comment Share on other sites More sharing options...
Mick Day Posted February 12, 2010 Share Posted February 12, 2010 It doesn't matter whether there is oil, water, air, or even hydrogen in the oil line. The gauge is set to measure pressure so will measue the pressure of whatever squashes up against the pressure diagphram inside. So to recap it doesn't matter whether it's gas or liquid in there; bleeding will at best be messy & worst will squirt oil everywhere. Link to comment Share on other sites More sharing options...
Ozzy Posted February 12, 2010 Share Posted February 12, 2010 You don't hang about, do you John! I reckon you've got too much time on your hands, so I'd better bring my car round for a service 😬 Nigel. C7 FST....Powered by DVA A Wolf in Clams Clothing! Link to comment Share on other sites More sharing options...
Bio Posted February 12, 2010 Author Share Posted February 12, 2010 Hi Nigel Thanks for coming over last weekend. now sorted Have tried bleeding the line and the gauge is more "Instant" in operation but after a couple of days has reverted back so the oil must drain back ☹️ however this does not cause a problem One more job done John Link to comment Share on other sites More sharing options...
Phil G Posted February 14, 2010 Share Posted February 14, 2010 Hi John, Slight hijack……..I have been meaning to buy all the bits from Think Auto myself. There appears to be a number of parts combinations which all give the same end result. What list of components did you choose? ----- Phil “If you want a place in the sun, you have to expect a few blisters” Link to comment Share on other sites More sharing options...
djg Posted February 14, 2010 Share Posted February 14, 2010 Ring Matthew at Think and he will provide all the bits, he just put in the part no's when I asked for a MOPG for a K. I can vouch for the kit as have just fitted one as have many others. Doug. Link to comment Share on other sites More sharing options...
Phil G Posted February 14, 2010 Share Posted February 14, 2010 Thanks Doug - I appreciate that there is a standard fitting kit which is the basic requirements; however, I’m interested in how different people tackle the job. I have looked at the kit listed on BC forum and IMHO it is overly complicated and the number of joints required can be reduced. There is also the option of securing the main manifold block or just tie wrapping it somewhere convenient. Some people use braided lines throughout and others use the plastic capillary tube supplied with the gauge. ----- Phil “If you want a place in the sun, you have to expect a few blisters” Link to comment Share on other sites More sharing options...
Bio Posted February 14, 2010 Author Share Posted February 14, 2010 Hi Phil Just looking at the bill now...although the T piece will be a differant thread on a K as mine is a VX TFE3 Hose braided 2.0 meters long OPG 100 Oil pressure gauge black face 100 PSI TP7 T piecw 14x1.5 (This will be differant for a K) E321-3 Fitting that screws into TP7 to take hose TFE3 E332-3 90 Degree fitting to make hose TF3 90 degrees at one end BPS2-55 Blanking plug for T piece (i did not fit an oil pressure switch) BSSC-14 Sealing washer for blanking plug You get 15% off for being a club member Hope this helps John Link to comment Share on other sites More sharing options...
dannylt Posted February 14, 2010 Share Posted February 14, 2010 It doesn't matter whether there is oil, water, air, or even hydrogen in the oil line. The gauge is set to measure pressure so will measue the pressure of whatever squashes up against the pressure diagphram inside. What? The equilibrium pressure sure, but air is very compressible, so it will damp a sudden change in pressure. Oil is virtually incompressible, so bleeding it should reduce the delay. Link to comment Share on other sites More sharing options...
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