darrens
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| posted on 21/4/08 at 06:38 PM |
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RV8 Oil Pressure
Probably been covered before but someone put my mind at ease. Can't find anything wrong the oil pressure seems a little high to me.
Cold Startup High Tickover 3bar
Normal tickover Hot, just over 1 bar.
High revs 4-5k Hot +4bar, sometimes 5bar
Are these about norm.
cheers
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rusty nuts
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| posted on 21/4/08 at 07:16 PM |
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Mechanical or electric gauge? Don't rely on electric gauge .
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mark chandler
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| posted on 21/4/08 at 07:45 PM |
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Rv8 with old cogs the norm would be oil light flickering at idle, 40-50 psi max....
But the good news is they work on volumn of oil so low pressue does not mean bad news, you have the opposite problem which is typically sticky
pressure relief valve.
So if you have the cog oil pump, all 3.5's up to around 91 then you can unbolt a brass bung on the pump housing, and remove the spring and
prssure plunger, clean off all the old goo and pop back in. If its still bad you can buy a tadpole plunger which is sold by people such as RPI to cure
this. For myself a good clean with a scotchbrite pad has always worked as some times they stick a bit open.
If you however have a 3.9 with crank driven pump, all 4.0 & 4.6's plus the last run of 3.9's then its unlightly to be this, and you
are probally okay as they are far better pumps but the engine runs on thinner oil 10-30 so if you have some thicker stuff castrol GTX etc this wpuld
explain why.
Worst case is a blocked oil line within the lump, in whuch case its a strip down job if it starts to knock.
Regards Mark
[Edited on 21/4/08 by mark chandler]
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darrens
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| posted on 24/4/08 at 06:57 AM |
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Thanks for info, will av a gander.
Cheers
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darrens
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| posted on 29/4/08 at 07:49 PM |
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Had a gander, relief valve seems fine (no goo any how, pretty clean)
At 88deg it sits slap bang on 1bar (14.5psi) at 800rpm.
At about 4000-5000rpm it's around 4-4.8bar (58psi to 69psi)
If a rocker cover is removed should the oil seep (drip drip) or gush from the rocker gear?
Just a bit paranoid at moment, but dont fancy stripping engine if there's nowt wrong..
Using 20/50 Oil (Halfords green stuff)
Cheers
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02GF74
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| posted on 30/4/08 at 09:59 AM |
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if you believe the guage then pushing 60 is a bit high.
you can buy uprated springs for the pressure relief valve and often folks stick in a allen bolt to do the same, as I have done ... but v8 is not about
pressure but volume so not necessary and that will just put more strain on the oil pump leading possible to an earlier failure. this mod on mine
limits to 40 psi, 15 ish at idle.
the valve and spring are cheap - replace both and check the pump body where they live is not scored. if the same psi is seen, then don't worry
about it - it would be the guage.
where are you? I thik I have a spare Tim guage, apillary type that you could try fitting onto your capillary tube.
incidentally you can pick up the complete guage + tube of the bay for around a tenner.
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