I just noticed this today, when driving at a steady accelerating rate in 2nd or 3rd gear (not WOT) the oil pressure needle rises steadily to 6kg/cm (85psi) but as soon as it hits 6kg it drops immediatley back to 5.5kg/cm (78psi) and remains there...ie this is maximum pressure...when driving at WOT in 4th or 5th gear it rises to 6kg, again drops to 5.5 but then rises and remains at 6kg/cm...it seems to be working fine otherwise. It idles at 25 > 28psi..usually at 28 (2kg/cm) and the needle sweeps very smoothly, like ist not jumpy or anything. Is this normal or is there something up with it?


Modified by mugenracer at 3:49 PM 2/4/2005

 

totally normal. There is a relief valve that pops at a certain pressure...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Philly_NBP_R &raquo;</TD></TR><TR><TD CLASS="quote">totally normal. There is a relief valve that pops at a certain pressure...</TD></TR></TABLE>


Yep! Same thing here.

 

Thanks...i never knew that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Philly_NBP_R &raquo;</TD></TR><TR><TD CLASS="quote">totally normal. There is a relief valve that pops at a certain pressure...</TD></TR></TABLE>

That would most likely be when the VTEC solenoid lets oil into the mechanism that switches from the lower to higher cam lobes, which in a stock ITR ECU is @ 6K rpm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zygspeed &raquo;</TD></TR><TR><TD CLASS="quote">That would most likely be when the VTEC solenoid lets oil into the mechanism that switches from the lower to higher cam lobes, which in a stock ITR ECU is @ 6K rpm. </TD></TR></TABLE>

maybe, but it relieves pressure regardless of the current RPM. The oil pressure ALWAYS stays below 6 kg/c cm (which can be reached at 2000 rpm on up, depending on oil temp).

 

Is the bypass just the bypass in the oil filter itself? That was my original impression. I don't know what other bypass exists.

 

there is a relief valve on the oil pump - it's number five in the above diagram.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Philly_NBP_R &raquo;</TD></TR><TR><TD CLASS="quote">[img]
there is a relief valve on the oil pump - it's number five in the above diagram. </TD></TR></TABLE>

Thanks a lot! I was wondering where that was.

-Chris

 

Same deal with mine when I had it. Altho, I've never actively looked for it on other brands of gauges.

 

I just noticed i have 'temp' instead of 'pressure' written in the thread title...its amazing that none of the H-T vultures jumped on that one!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mugenracer &raquo;</TD></TR><TR><TD CLASS="quote">I just noticed i have 'temp' instead of 'pressure' written in the thread title...its amazing that none of the H-T vultures jumped on that one!</TD></TR></TABLE>

Its because this was a very good useful question!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mugenracer &raquo;</TD></TR><TR><TD CLASS="quote">I just noticed i have 'temp' instead of 'pressure' written in the thread title...its amazing that none of the H-T vultures jumped on that one!</TD></TR></TABLE>
your topic made it clear it was pressure.. anyway, i have same thing happening