12v oil primer

Ken(Ark)

Well-known Member
Anyone ever rig up a 12v pump to prime the oil pressure before starting the motor . Seems these N's would benefit more than most motors . I see the pumps are commonly being used to help cool rear ends and the prices are coming down . The cheaper pumps are not recommended for long intervals but 10 psi for a few seconds before starting would do wonders I would think . Just looking for opinions from someone that has tried it or used 12v oil pumps.
 
(quoted from post at 18:35:58 07/31/18) Anyone ever rig up a 12v pump to prime the oil pressure before starting the motor . Seems these N's would benefit more than most motors . I see the pumps are commonly being used to help cool rear ends and the prices are coming down . The cheaper pumps are not recommended for long intervals but 10 psi for a few seconds before starting would do wonders I would think . Just looking for opinions from someone that has tried it or used 12v oil pumps.

I think that would simply be masking a problem that needs to be fixed before it leads to more expensive issues.

TOH
 
(quoted from post at 17:52:02 07/31/18)

I think that would simply be masking a problem that needs to be fixed before it leads to more expensive issues.

TOH

Who said there was a problem :wink: I think it would extend the life span on any motor new or slightly tired .
 
Priming the system on a fresh build is a good idea because it contains no oil. Priming an already-run engine is not necessary because the components are already oiled. Even though most of the oil drains back into the pan the surfaces retain a layer of oil. Unless the engine sits for a long time without being run I wouldn't bother. Just my $.02.
 
(quoted from post at 18:41:34 07/31/18) Priming the system on a fresh build is a good idea because it contains no oil. Priming an already-run engine is not necessary because the components are already oiled. Even though most of the oil drains back into the pan the surfaces retain a layer of oil. Unless the engine sits for a long time without being run I wouldn't bother. Just my $.02.

Most of my older Chevy trucks have a slight knock on start up for the first few seconds and have for years , still run great . My 3 cylinder Ford diesel will be expensive to rebuild and the N's have their oil pumps above the oil level . I see 12v gear driven oil pumps for about $40 . Just wondering if anyone has first hand experience with pre oilers , factory or aftermarket . Whether its practical or not is the other side of the coin . Spending $4k restoring an 8N is not practical but if a man wants to do it I'd say go for it . Always glad to hear pro's and con's on any subject here .
 

Ken, remove the oil pan from the motor of something other than your N, let it stand for two weeks, then crawl under and see if you get dripped on.
 
(quoted from post at 22:17:05 07/31/18)
(quoted from post at 18:41:34 07/31/18) Priming the system on a fresh build is a good idea because it contains no oil. Priming an already-run engine is not necessary because the components are already oiled. Even though most of the oil drains back into the pan the surfaces retain a layer of oil. Unless the engine sits for a long time without being run I wouldn't bother. Just my $.02.

Most of my older Chevy trucks have a slight knock on start up for the first few seconds and have for years , still run great . My 3 cylinder Ford diesel will be expensive to rebuild and the N's have their oil pumps above the oil level . I see 12v gear driven oil pumps for about $40 . Just wondering if anyone has first hand experience with pre oilers , factory or aftermarket . Whether its practical or not is the other side of the coin . Spending $4k restoring an 8N is not practical but if a man wants to do it I'd say go for it . Always glad to hear pro's and con's on any subject here .

Practical in that it can be done at a reasonable cost? Yes.

Practical in that it will buy you measurable improvement in service life on any of these engines? Doubtful.

I have no personal experience with pre-oilers but here is my basis for saying that:

Most main/rod bearing wear occurs on startup and shutdown when the crankshaft is spinning at very low RPM and the hydrodynamic oil film that keeps the journal off the bearing surface becomes so weak/thin that you get metal to metal contact. Pre-oiling will do nothing to prevent that. It will however ensure that there is sufficient volume of oil in the journal oil oil clearance at startup to allow the oil film to form quickly once the crankshaft RPM comes up to speed. If bearing oil clearances are already tight preventing excessive drain back and oil pump delivery is timely the gain from pre-oiling is minimal. If bearing clearances are wide and/or oil pump delivery is delayed the oil delivered by the pre-oiler is simply going to disappear under load and the oil film will be lost until the oil pump delivery catches up.

In summary if the oil pump delivery is not nearly instantaneous the initial gain from the pre-oiling is insignificant compared to the wear caused by the delay coming from the pump. And in no case does it eliminate that startup/shutdown window where the journal is in contact with the bearing and the bulk of bearing wear occurs.

TOH
 
(quoted from post at 08:25:20 08/01/18)
(quoted from post at 22:17:05 07/31/18)
(quoted from post at 18:41:34 07/31/18) Priming the system on a fresh build is a good idea because it contains no oil. Priming an already-run engine is not necessary because the components are already oiled. Even though most of the oil drains back into the pan the surfaces retain a layer of oil. Unless the engine sits for a long time without being run I wouldn't bother. Just my $.02.

Most of my older Chevy trucks have a slight knock on start up for the first few seconds and have for years , still run great . My 3 cylinder Ford diesel will be expensive to rebuild and the N's have their oil pumps above the oil level . I see 12v gear driven oil pumps for about $40 . Just wondering if anyone has first hand experience with pre oilers , factory or aftermarket . Whether its practical or not is the other side of the coin . Spending $4k restoring an 8N is not practical but if a man wants to do it I'd say go for it . Always glad to hear pro's and con's on any subject here .

Practical in that it can be done at a reasonable cost? Yes.

Practical in that it will buy you measurable improvement in service life on any of these engines? Doubtful.

I have no personal experience with pre-oilers but here is my basis for saying that:

Most main/rod bearing wear occurs on startup and shutdown when the crankshaft is spinning at very low RPM and the hydrodynamic oil film that keeps the journal off the bearing surface becomes so weak/thin that you get metal to metal contact. Pre-oiling will do nothing to prevent that. It will however ensure that there is sufficient volume of oil in the journal oil oil clearance at startup to allow the oil film to form quickly once the crankshaft RPM comes up to speed. If bearing oil clearances are already tight preventing excessive drain back and oil pump delivery is timely the gain from pre-oiling is minimal. If bearing clearances are wide and/or oil pump delivery is delayed the oil delivered by the pre-oiler is simply going to disappear under load and the oil film will be lost until the oil pump delivery catches up.

In summary if the oil pump delivery is not nearly instantaneous the initial gain from the pre-oiling is insignificant compared to the wear caused by the delay coming from the pump. And in no case does it eliminate that startup/shutdown window where the journal is in contact with the bearing and the bulk of bearing wear occurs.

TOH

Through most of the articles I have recently read it also does not appear to be much concern on the crank and bearings at start up . The lifters take a beating at start up but are usually not a factor to engine failure . Most of the info from people that were not trying to sell pre oilers was quality oil and change regularly .
Thanks for the input - Ken .
 

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