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kai.scott98
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Joined: August 29, 2015
Posts: 514
Location: lincolnshire
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 Posted: Fri Dec 08, 2017 12:22 pm Post subject: oil pressure problems? |
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So what should the oil pressure of a stock 1600 be at idle and at around 3000 rpm? i just fit a rebuilt 1600 engine in my bug and when its at idle, my oil pressure guage reads about 3-3.5 bar, when i acclerate to about 2000 rpm it jumps up to around 4.5-5 bar, the guage i have reads from 0 to 5 bar so if i rev higher than 2000 rpm, the pressure will be higher but i dont know how much higher. also, when i rev the car past around 2500 rpm, theres a bit of a kind of high pitch knocking or tapping noise but that may be the valve timing out, i dont know what that sounds like. the engine does also cut out after about 5 minutes of running, but will start back up after. one weird thing that happened is that i started the car to test drive it around the front of my house and it cut out and wouldnt start, i later found that the rotor in the dizzy wasnt spinning and had become disengaged, i managed to get it back into the drive gear thing and its been fine since but still cuts out every 5 or so mins, i think thats down to the carb icing up though because i have no heat risers (have bought a second hand intake with heat risers, its in the mail).
when i first installed the engine, i found that it had really low compression and the rings were stuck, i freed them off with oil down the bores and its been good for compression ever since, each cylinder reads between 125-150 psi at each cylinder.
clutch has also been squealing unless i put my foot on the pedal even slightly, so i guess that it just needs adjusting and has nothing to do with the oil pressure issue.
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Danwvw
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kai.scott98
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UK Luke 72
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kai.scott98
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[email protected]
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Joined: May 17, 2003
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Location: Harmony, PA
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| Posted: Fri Dec 08, 2017 1:07 pm Post subject: Re: oil pressure problems? |
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| UK Luke 72 wrote: |
3 bar at idle? Naw...
5-15psi or so at idle and 10 bar per 1000 rpm after that. |
There needs to be clarification of bar vs. psi.
Google calculates 1 bar is equal to 14.50 psi. By this, what you are saying is that 5-15 is good at idle, and pressure at 1000 rpms should be a 145 psi, and go an additional 145 psi more with each 1000 rpm increment....?
What I understand from the op is at idle is 3-3.5 bar, which would be around 44-51 psi. And the higher rpm would be 4.5-5 bar, or 65-73psi. An acceptable psi imo is 10 psi at idle, and 10 psi per 1000 of rpm. That would be 0.7 bar at idle, and say 2.75 bar at 4000 rpm. A fresh 1600 engine maybe 20-25 psi at idle, 50+ at 4000 rpm.
Is this pressure cold, or fully warmed up? Cold would not be too out of the ordinary, but fully to temp is quite high.
Last edited by [email protected] on Fri Dec 08, 2017 1:10 pm; edited 1 time in total |
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mukluk
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| Posted: Fri Dec 08, 2017 1:09 pm Post subject: Re: oil pressure problems? |
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| kai.scott98 wrote: |
| 10 bar?? or 10 psi? |
10 psi. I'm pretty sure 10 bar would probably blow the oil cooler apart.
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FreeBug
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| Posted: Fri Dec 08, 2017 1:13 pm Post subject: Re: oil pressure problems? |
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10 p.s.i. per 1000 rpm.
5 bar at idle is what I'm seeing at cold start, with the stock fast idle cam and carb, etc....stock 1600. Drops pretty quickly, though, as idle speed gets down to normal, and as oil warms up.
it's about -10°C, and I'm using 5W-40 oil. |
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kai.scott98
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Joined: August 29, 2015
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| Posted: Fri Dec 08, 2017 1:23 pm Post subject: Re: oil pressure problems? |
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it is cold start, the engine doesnt have long enough to get hot really, so its fine as it is? my 1200 was always less than this, although i did blow out both oil seals out the front and rear out of the case... then it was certainly lower..
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Danwvw
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| Posted: Fri Dec 08, 2017 1:30 pm Post subject: Re: oil pressure problems? |
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| kai.scott98 wrote: |
| my oil pressure gauge reads about 3-3.5 bar, when i accelerate to about 2000 rpm it jumps up to around 4.5-5 bar |
Sounds about right for 30 weight oil in a cold engine. But If it's reading that much pressure after the oil temp reaches 180 deg F / 80 deg Celsius then I would question things.
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kai.scott98
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| Posted: Fri Dec 08, 2017 1:38 pm Post subject: Re: oil pressure problems? |
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yeah its 30 weight, the oil was too high, i was told to put too much oil in the car by the guy helping me fit the engine, being 19 and not knowing everything about everything, i listenend to him ( he told me to put 4 litres in) (he owns a classic car garage), i realised this may be too much and put 3 litres in, i now believe it should be about 2. the oil line was quite a bit above the top mark so i drained some and at the minute its just above the oil mark, like 1 cm above, will drain more tomorow, maybe that will drop the oil pressure a bit.
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UK Luke 72
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| Posted: Fri Dec 08, 2017 1:39 pm Post subject: Re: oil pressure problems? |
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| [email protected] wrote: |
| UK Luke 72 wrote: |
3 bar at idle? Naw...
5-15psi or so at idle and 10 bar per 1000 rpm after that. |
There needs to be clarification of bar vs. psi.
Google calculates 1 bar is equal to 14.50 psi. By this, what you are saying is that 5-15 is good at idle, and pressure at 1000 rpms should be a 145 psi, and go an additional 145 psi more with each 1000 rpm increment....?
What I understand from the op is at idle is 3-3.5 bar, which would be around 44-51 psi. And the higher rpm would be 4.5-5 bar, or 65-73psi. An acceptable psi imo is 10 psi at idle, and 10 psi per 1000 of rpm. That would be 0.7 bar at idle, and say 2.75 bar at 4000 rpm. A fresh 1600 engine maybe 20-25 psi at idle, 50+ at 4000 rpm.
Is this pressure cold, or fully warmed up? Cold would not be too out of the ordinary, but fully to temp is quite high. |
My bad... We all know I meant PSI 
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mikedjames
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Location: Hamble, Hampshire, UK
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| Posted: Sat Dec 09, 2017 1:40 pm Post subject: Re: oil pressure problems? |
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I run Halfords Classic 20W/50 as its the only easily avaialable oil suited to older cars I can find here in Southampton UK.
On a cold start around -3C or 27F my 1641 with a 26mm pump will max out my 104PSI /7.2 bar gauge if I put my foot down immediately after starting it.
Once it did a 5 second oil dump on the drive as a hose popped off the cooler.
But soon drops back to a quarter of that pressure at idle then down to 8psi / 0.5 bar with the oil around 100C /212F after driving hard for 15 motorway miles in my bus.
So I reckon going off the top of a 5 bar gauge on a cold UK day is OK provided it settles back to the approximate formula of 10psi at idle plus 10psi per 1000rpm with hot oil.
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