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| Home > Help Needed / General Tech Chat > Low oil pressure, std ish 998 | |||||||
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Site Admin  9407 Posts Member #: 58 455bhp per ton 12 sec 1/4 mile road legal mini Sunny Bridgend, South Wales |
1st Jun, 2010 at 11:28:32pm
My 998 engine has got problem with oil pressure. We've put fresh 20/50 oil in, and on startup it takes around 10 seconds to get oil pressure. When cold oil pressure is around 65 psi, when hot it's around 20psi when idle which rises to 40 psi ish when reved.
On 15th May, 2009 TurboDave said:
I think the welsh one has it right! 1st to provide running proof of turbo twinkie in a car and first to run a 1/4 in one!! Is your data backed up?? one extra month free for all Turbo minis members, PM me for detials |
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 558 Posts Member #: 8143 Post Whore London |
1st Jun, 2010 at 11:37:13pm
What gauge do you have? The Tim ones can be slow registering pressure |
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Forum Mod  1927 Posts Member #: 1761 Stalker Bristol |
1st Jun, 2010 at 11:37:25pm
Exact same problem as me, low oil pressure issues when using 20W50 oil. I previously had semi-synthetic and never had any oil pressure issues. The engine has done 85k miles.
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 9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
1st Jun, 2010 at 11:43:15pm
imo if its getting oil whilst its running and is not knocking its ok,
Yes i moved to the darkside |
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Forum Mod 1927 Posts Member #: 1761 Stalker Bristol |
1st Jun, 2010 at 11:46:13pm
On 1st Jun, 2010 Brett said:
imo if its getting oil whilst its running and is not knocking its ok, its probably a combination of every thing, worn bearings, rockers, pump This is what I thought when i first started getting issues, but then i remembered with the old oil, i would never see the oil pressure light, the briefest of flashes from the light when cold then and then never again. With the 20W50, i often see it stay on for a few seconds from cold, and for a long time on hot starts, some times 10 seconds. The only difference in my case, is the oil type and grade. |
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Site Admin  15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
1st Jun, 2010 at 11:57:10pm
51, pah rubbish, my old one made 52, yaaaa boo sucks.....
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
2nd Jun, 2010 at 12:02:40am
On 1st Jun, 2010 Carl S said:
On 1st Jun, 2010 Brett said:
imo if its getting oil whilst its running and is not knocking its ok, its probably a combination of every thing, worn bearings, rockers, pump This is what I thought when i first started getting issues, but then i remembered with the old oil, i would never see the oil pressure light, the briefest of flashes from the light when cold then and then never again. With the 20W50, i often see it stay on for a few seconds from cold, and for a long time on hot starts, some times 10 seconds. The only difference in my case, is the oil type and grade. i currently have 20/50 comma classic stuff in, its been excellent i have tried 4 or 5 different mineral oils in this engine imo thats the best so far, but with this recent hot spell we just had i did abut 30 miles on a motorway, the temps went into the red briefly and this oil is well and truly cooked on the other hand my last 998 had done 60k ragged over 7krpm every gear for 25k of it, i ran it on gtx magnetex no oil pressure issue but when i stripped it down i could see light down the side of the pistons and lovely clonking on all the bearings, i loved that engine it just never stopped pulling anyway back on topic, i will buy synth / semi synth for the next change ( ie this week) Yes i moved to the darkside |
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 6753 Posts Member #: 828 Post Whore uranus |
2nd Jun, 2010 at 07:15:25am
i also have a tim guage in the astra ,with the thin copper pipe ,its very slow to read too. Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
2nd Jun, 2010 at 07:52:51am
I would firstly bin the ball bearing release valev and fit a standard one. I had no end of trouble with odd oil pressure when I ran one.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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 3329 Posts Member #: 184 Senior Member Melton Mowbray, Pie Country |
2nd Jun, 2010 at 08:22:28am
I seem to remember we had odd oil pressure reading on the TT. It was tracked down to the 'T' piece on the engine where the gauge pipe was taken from. We drilled out the 'T' picece and all was well.
http://www.twin-turbo.co.uk
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
2nd Jun, 2010 at 08:31:16am
You are right Ben. The oil pressure signal was being taken froma T-piece that was also feeding the turbo. Because of the small bore through the T-Piece, and the flow through it the oil pressure read very low.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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3329 Posts Member #: 184 Senior Member Melton Mowbray, Pie Country |
2nd Jun, 2010 at 09:23:20am
Still worth a look though. http://www.twin-turbo.co.uk
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Site Admin 9407 Posts Member #: 58 455bhp per ton 12 sec 1/4 mile road legal mini Sunny Bridgend, South Wales |
2nd Jun, 2010 at 02:18:59pm
cheers guys, I'll check that. Does everyone have a simular opinion on ditching the ball? On 15th May, 2009 TurboDave said:
I think the welsh one has it right! 1st to provide running proof of turbo twinkie in a car and first to run a 1/4 in one!! Is your data backed up?? one extra month free for all Turbo minis members, PM me for detials |
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 10023 Posts Member #: 1456 Mongo Barnsley, South Flatcapshire |
2nd Jun, 2010 at 02:20:29pm
I've heard of random oil pressure issues when using the ball setup too. If something is worth doing, it's worth doing half of. |
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9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
2nd Jun, 2010 at 03:16:16pm
i ditched the ball too, same reason as john, one day cold fire up would be sky high, the next it would be quite low Yes i moved to the darkside |
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 1346 Posts Member #: 2340 Post Whore Dublin Ireland |
2nd Jun, 2010 at 03:24:50pm
ditch the ball is a bad Idea that does not work the bullet works just fine all you need do is sand the barrell of the bullet with some 120G paper to get it nice an smoth put it back in with a little engine asembly lube and bobs your uncal,
On 17th Feb, 2009 Rob H said:
I find the easiest way is to super glue the bolt to the end of one of my fingers. ______________________________________________________ |
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Site Admin 9407 Posts Member #: 58 455bhp per ton 12 sec 1/4 mile road legal mini Sunny Bridgend, South Wales |
2nd Jun, 2010 at 03:47:35pm
not sure what it revs to, flat out in 2nd gear, no rev counter or data logging On 15th May, 2009 TurboDave said:
I think the welsh one has it right! 1st to provide running proof of turbo twinkie in a car and first to run a 1/4 in one!! Is your data backed up?? one extra month free for all Turbo minis members, PM me for detials |
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Site Admin 15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
2nd Jun, 2010 at 04:42:21pm
Mine used to rev to an indicated 6500rpm or so. Valve bounce then limits RPM from any more.
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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3329 Posts Member #: 184 Senior Member Melton Mowbray, Pie Country |
2nd Jun, 2010 at 04:44:43pm
my 998 revs past 7k and has done for years with no crank or oil pressure issues (that I know of) http://www.twin-turbo.co.uk
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1346 Posts Member #: 2340 Post Whore Dublin Ireland |
2nd Jun, 2010 at 05:14:15pm
was that a hardened crank ben On 17th Feb, 2009 Rob H said:
I find the easiest way is to super glue the bolt to the end of one of my fingers. ______________________________________________________ |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
2nd Jun, 2010 at 06:15:19pm
nope, and it's a pretty old engine now, won me the Class A cup at Avon 10 years ago, it even got re-built in Donnington park services as it had a holed piston when a valve broke (long story) Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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Site Admin 15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
2nd Jun, 2010 at 06:32:04pm
On 2nd Jun, 2010 wil_h said:
re-built in Donnington park services as it had a holed piston when a valve broke (long story) Get typing then, you can't drop a hint of an interesting tale like that, and then not tell us!
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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388 Posts Member #: 442 Senior Member Manchester |
2nd Jun, 2010 at 06:44:12pm
Ive got a 998 with only slight mods. I have a tim gauge which takes around 3 to 5 seconds to prime from cold. Almost instant when warm.
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
2nd Jun, 2010 at 07:43:29pm
On 2nd Jun, 2010 Tom Fenton said:
On 2nd Jun, 2010 wil_h said:
re-built in Donnington park services as it had a holed piston when a valve broke (long story) Get typing then, you can't drop a hint of an interesting tale like that, and then not tell us! Well the car was being put back together to transport me and sooz from our wedding cereomny to the reception. The week befoer Ben was doing some testing with the then new Megasquirt, when it dropped a valve-head that stuck in the piston. Knowing that we needed it the next week Ben stripped it all down and I got a piston and rod. We then met at Donnington Park services (about mid way between our rhouses at the time) where we rebuilt the engine in the boot of his car. Car ran fine at the wedding and is still going strong. Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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Site Admin 9407 Posts Member #: 58 455bhp per ton 12 sec 1/4 mile road legal mini Sunny Bridgend, South Wales |
2nd Jun, 2010 at 07:50:44pm
ahhhhh and they all lived happily ever after. On 15th May, 2009 TurboDave said:
I think the welsh one has it right! 1st to provide running proof of turbo twinkie in a car and first to run a 1/4 in one!! Is your data backed up?? one extra month free for all Turbo minis members, PM me for detials |
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