Right since rebuilding it the oil pressure still aint right, the engine is coming out at the end of this month so i can fit the F28 and i am going to pull the engine to bits again and check it over again, what shud i look for? When it was last rebuild it had the following:
Crank polished and new shells,
ARP rod bolts,
New oil pump,
XE inlet cam fitted,
and a SBD plastic relief valve.
Since doing this i have ran it in gently and ever since then the oil pressure has nexer been right, on startup the pressure is full bars on a astra digi dash but after 20-30 minutes of driving at idle it drops down to 2 bacs on a digi dash and not 3 bars like my old XE did. The oil its got in it is 10-40 vaux semi synthetic and after a long run at 4-5000 rpm the oil pressure will not go up to full on the digi dash till about 3000 rpm. Anyone got any gen on what to check first?
The first thing I would do is find out if the pressure reading is accurate (check all wiring connections and earths)
Go to a good tuning shop and they will be able to give you an accurate reading via a proper pressure guage (at least you will know)
Running in of a new engine should be done using a good quality Mineral Multi grade oil (not Synthetic)
You may find THIS INFO of some use.
So to summarize do not trust your guage until you know for sure.
Best I can do from here mate.
I am using the pressure sensor off my XE engine and the reading was very good on that engine, i have had it tested on a manual snap on gauge and the reading is fine but i just do not have any trust in the engine at all. Is this what turbo ownership is meant to be like waiting for it to blow up or something to go wrong? Rick
Originally posted by Rick Draper on startup the pressure is full bars on a astra digi dash but after 20-30 minutes of driving at idle it drops down to 2 bacs on a digi dash and not 3 bars like my old XE did. The oil its got in it is 10-40 vaux semi synthetic and after a long run at 4-5000 rpm the oil pressure will not go up to full on the digi dash till about 3000 rpm. Anyone got any gen on what to check first?
Check for a problem? That sounds normal to me. You're bothered about 1 'bar' difference on an different engine using a old uncalibrated and ungraduated guage?
Full oil pressure on idle is not needed and will quickly destroy things on a turbo engine as oil seals are swamped with oil. Only around 2-4psi is needed to float bearings. And the requirement specification vauxhall say for the LET is 0.3 bar for hot idle. IE, hardly anything. Full pressure should be reached by 2.5-3.5K RPM.
So your saying that the oil pressure would be higher on my XE than on my LET engine? I noticed tonight on the top stud closest to the thermostat on the exhaust manifold a pool of oil, upon pulling the stud out of the head there was all oil on the stud, any idea what this is all about? It had quite a lot of oil in the stud hole as well. Rick