rapid.STI

iTrader: (5)

what oil pressure should a 1997 sti be running???
thankyou wayne.

Shmerman

iTrader: (14)

around 3bar on idle and 7-8bar cruise IIRC

rapid.STI

iTrader: (5)

strange? mine is only running 1br on idle and about 2an half on crusing?

Lateral Performance

iTrader: (20)

7-8bar is pretty high, circa 5.5-6bar would be more common.

2.5bar is too low, and something, whether it be the gauge/sensor, or engine, isn't right.

scooby-tc

iTrader: (2)

should be around 2-3 bar on warm idle and 6 bar when driving

rapid.STI

iTrader: (5)

well its jusyt had, bigend bearins, mai bearings, supposed to be a modified oil pump, new oil cooler modine??

could it be that my oil pressure all depend on what the oil temp says? i broke the wires for the oil temp plug and aint gt round to sorting it, there lamco gauges.

thanks again

Shmerman

iTrader: (14)

Yes to a certain extent......when cold the pressure will be high. However once up to running temps you should be seeing oil pressure as stated above.

mit

iTrader: (10)

Mines 6-7 on cold idle, 2.5-3 on warm idle, 6-7 when driving.
I'd get it checked by the people who re-built it, before it gets very expensive

Mit

Lateral Performance

iTrader: (20)

Under any circumstances, 2.5bar on cruise is too low.

If the gauge is reading correctly, there is something wrong with the build, be it the wrong bearing clearances, a loose oil pump back plate, or something else allowing the oil to bleed internally.

dunx

iTrader: (3)

Try and borrow a mechanical gauge to check !

HTH

dunx

rapid.STI

iTrader: (5)

it just sounds like 1 rod rattling? oil pressures are fine on cold idle, but once warmed up i have a reading of 1br. on cruise its at 2.5br?

i built the engine myself, first time ever on a scoob. it drives absolutly spot on? it also gives a little rattle every now and again at around 2.5k RPM? thanks guys

SUBARU COMPETITION ACL ENGINE BEARING SET on eBay, also, Subaru, Car Parts, Cars, Parts Vehicles (end time 19-Jan-09 22:56:11 GMT)

these are the bearings i bought^^^^^^^^^

my crank was re polished on ,main

merlin24

iTrader: (1)

Bearings in the link are standard size which are ok for a standard size crank ( assuming your crank had standard size journals and not been ground in the past) but also depends on much was removed from the main bearing journals when polished - did you check the oil clearance on the mains ?
Big end oil clearance should have been checked also,prior to final build.

Mick

rapid.STI

iTrader: (5)

thanks for that merlin, ive just looked at my reciept.

own subaru 2ltr crankshaft, polish mains@std and regrind big ends@0.05mm

thats exactly what it says on my reciept? what bearings should i have gotten? there the size he was going to give me, only in dura glide not race series. hence why i got them myself? 52mm journal centre thrust.

thanks guys

merlin24

iTrader: (1)

Sorry to say it Wayne but if you have fitted standard size big end shells to a 0.05mm undersize big end journal - your oil clearance is going to be approx 0.022" - way too big and might well be the cause of your low oil pressure.
Might also explain the "occasional" big end rattle you get at 2500rpm.

Mick

overlord

I had this low oil pressure problem with my scoob after i rebuilt it and now it makes a grumbling noise. I had new crank, mains and bigends and i checked bigend oil clearance

rapid.STI

iTrader: (5)

so what would i need to do it properly? could i reuse the head gaskets and bolts as they have only done tops 25 mile? or would the bolts be stretched?
what size bearings would i need?
should be a doddle second time round eh? thanks for the help plp i really am grateful.

mit

iTrader: (10)

hats off to you for taking it so well, i was gutted when i got the inlet/exhaust cams the wrong way round on my last car.

rapid.STI

iTrader: (5)

i know mate. at the end of the day at least i have caught it this time before serious probs(thanks to some of the lads on here)

the car is fine hence the ratlle and low oil pressure. drives spot on!
its all experiance 2, should be out and stripped in a day this time

so i have a few qeustions?

1. what size bearing would i need?(main + bigend)
2. can i reuse the head gaskets and bolts?(only done maybe 30miles)
3. can i reuse timing belt? (same again only 30miles)

thanks boys

merlin24

iTrader: (1)

IMHO - i would not use a re-ground crank - go buy yourself a new center thrust crank and standard size bearings.
Cam belt and head bolts can be reused - bit of a lottery reusing the head gaskets as they are already "crushed" down.

Mick

rapid.STI

iTrader: (5)

thanks merlin. the head gaskets are from roger clark, there the 1.6mm steel gaskets, there solid.

if i decide to keep the re-ground crank, is it possible to get it re-hardened?


were would i get it done?
at what cost?

thankyou

joz8968

iTrader: (13)

Before you consider that, please read!!!:-

https://www.scoobynet.com/general-te...rankshaft.html

rapid.STI

iTrader: (5)

mate ive read it, i know i had my crank ground on my own bk. would like to get it hardened?

also what size bearing would i put in for the bigend? it was ground at 0.5mm

merlin24

iTrader: (1)

By the time you have had it re-hardened / straightened and polished,you might as well get a new crank to be honest.
You would need big end bearings to suit a 51.950mm big end journal if it has been ground 0.50mm undersize.

Mick

rapid.STI

iTrader: (5)

thanks matey, youve been a big help through out it

so am i right in saying my big end journal size is 51.950mm, thats right? i put 52mm journal 1s in

shame on me