[Diy_efi] [ot] Oil pressure during cranking ?

[Geoff Harrison]

Mike, when I do an oil change, I have a kill switch on the ECM, 
which I flick
when I pop the bonnet. Crank until idiot light goes out, usually 
takes 10 secs.
Flick the switch, crank again. Oil pressure switches like this 
open at about 40Kpa.
If you can get that, or more while cranking, should be OK to 
restore ign.
If you had the pump off, you might find if you prime the filter, 
presure will
be restored.
Good luck
Geoff

> Thats an interesting point Mark,
> Might be mine isnt as self priming as they need to be at low 
> (crank)
> rpms, maybe I need to back feed some oil into the oil pressure
> sense gallery to get it started...:(
>
> Thanks for the feedback, food for thought,
>
> rgds
>
> Mike
>
>
> At 03:36 PM 10/31/05, you wrote:
>>hi, u should get pressure while cranking the engine.
>>a couple of weeks ago , i rebuilt a 308 holden , cranked it 
>>for  ages, still no pressure, what i had to do is  put a heap 
>>of grease in the  oil pump , and as soon as i started 
>>cranking, i had oil pressure.
>>mark k
>>
>>
>>----- Original Message ----- From: "Mike" <niche at iinet.net.au>
>>To: <diy_efi at diy-efi.org>
>>Sent: Monday, 31 October 2005 5:48 PM
>>Subject: [Diy_efi] [ot] Oil pressure during cranking ?
>>
>>
>>>Sorry guys but I need an opinion on this off topic item asap 
>>>?
>>>
>>>When cranking an engine over, do most crank driven oil
>>>pumps generate much pressure or do they have a minimum
>>>crank speed before they raise oil pressure ?
>>>
>>>In my case, I did some bottom end work, put everything back,
>>>heaps of oil in sump, took out spark plugs, cranked engine
>>>over for 25 secs and still no oil pressure :( I'm not using a
>>>sender but a proper oil pressure gauge I have just checked
>>>on a compressor. Engine is RB30ET 6cyl nissan, had oil
>>>pressure before (via sender) but discovered oil sender was
>>>faulty and reading high but there was still pressure...
>>>
>>>So hence my question, do I need a min RPMs ?
>>>
>>>
>>>
>>>Regards from
>>>
>>>
>>>Mike
>>>Perth, Western Australia
>>>VL Commodore Fuse Rail that wont warp or melt !
>>>Twin tyres for most sedans, trikes and motorcycle sidecars
>>>http://niche.iinet.net.au
>>>_______________________________________________
>>>Diy_efi mailing list
>>>Diy_efi at diy-efi.org
>>>http://lists.diy-efi.org/mailman/listinfo/diy_efi
>>>
>>
>>
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>
>
> Regards from
>
>
> Mike
> Perth, Western Australia
> VL Commodore Fuse Rail that wont warp or melt !
> Twin tyres for most sedans, trikes and motorcycle sidecars
> http://niche.iinet.net.au
> _______________________________________________
> Diy_efi mailing list
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> http://lists.diy-efi.org/mailman/listinfo/diy_efi