Rob,
The article that Bill referenced would be of relevance for those considering running a high volume oil pump in an olds engine. The article also serves to point out the reality that contamination due to a filter in bypass mode is a real threat that all engine builders need to keep in mind.
Consider what happens to the oil filter bypass valve under any the following conditions:
1-Cold start
2-Dirty filter
3-high viscosity oils
On a completely stock Olds engine there is a strong possibility that the bypass valve may open.
Add a high volume oil pump, and now you are possibly exceeding the flow limits of the oil filter, forcing a bypass condition under a wider range of conditions.
I have always wondered about how the filter bypass valve responds to a high volume oil pump, especially with the relatively small oil filter used on the olds engines.
You need to get your flow tests done, and while there, compare the two filter sizes and their effects. It would also be nice to be able to compare a few different oil viscosities and how they might affect bypass function.
Les Burt
Montreal
'75 Eleganza 26'
>
> Bill,
>
> I'm sorry but in my opinion the information referenced is irrelevant to the Olds 455 and 403 as both use oil filters that DO NOT
> have bypasses in them.
>
> The bypass is located in the oil filter adapter tat bolts directly to the side of the engine block:
>
> http://www.gmcmhphotos.com/photos/455-2f-403-engine-oil-flow-path/p60140-oil-filter-base1.html
>
> I would suggest you review this sequence of photos:
>
> http://www.gmcmhphotos.com/photos/g6398-455-2f-403-engine-oil-flow-path.html
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of Bill Wevers
> Sent: Friday, June 8, 2018 11:31 AM
> To: gmclist
> Subject: Re: [GMCnet] Motor troubles again!!!
>
> Saw this on the Corvette forum, as it relates to the oil filter bypass valve.
> And the Olds is set at only 5 PSI.
>
> "Today's engine has very tight tolerances, two stage oil pumps and high flow lubrication system requirements. The proper match of
> oil filter to engine application is more important than it has ever been in the past. The use of a replacement oil filter with an
> internal bypass valve opening pressure specifications of 15 PSI (100 kPa) or less, allows debris to circulate in the engine causing
> damage to bearings and other tight tolerances areas, which may result in premature engine failure."
>
> https://www.corvetteforum.com/forums/c7-z06-discussion/4119585-oil-filter-bypass-valve-is-important.html
> https://www.corvetteforum.com/forums/attachments/c7-z06-discussion/48268771d1522338334-oil-filter-bypass-valve-is-important-2012-201
> 7-corvette_-service-bulletin_-17-na-157.pdf
> --
> Bill Wevers
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
The article that Bill referenced would be of relevance for those considering running a high volume oil pump in an olds engine. The article also serves to point out the reality that contamination due to a filter in bypass mode is a real threat that all engine builders need to keep in mind.
Consider what happens to the oil filter bypass valve under any the following conditions:
1-Cold start
2-Dirty filter
3-high viscosity oils
On a completely stock Olds engine there is a strong possibility that the bypass valve may open.
Add a high volume oil pump, and now you are possibly exceeding the flow limits of the oil filter, forcing a bypass condition under a wider range of conditions.
I have always wondered about how the filter bypass valve responds to a high volume oil pump, especially with the relatively small oil filter used on the olds engines.
You need to get your flow tests done, and while there, compare the two filter sizes and their effects. It would also be nice to be able to compare a few different oil viscosities and how they might affect bypass function.
Les Burt
Montreal
'75 Eleganza 26'
>
> Bill,
>
> I'm sorry but in my opinion the information referenced is irrelevant to the Olds 455 and 403 as both use oil filters that DO NOT
> have bypasses in them.
>
> The bypass is located in the oil filter adapter tat bolts directly to the side of the engine block:
>
> http://www.gmcmhphotos.com/photos/455-2f-403-engine-oil-flow-path/p60140-oil-filter-base1.html
>
> I would suggest you review this sequence of photos:
>
> http://www.gmcmhphotos.com/photos/g6398-455-2f-403-engine-oil-flow-path.html
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of Bill Wevers
> Sent: Friday, June 8, 2018 11:31 AM
> To: gmclist
> Subject: Re: [GMCnet] Motor troubles again!!!
>
> Saw this on the Corvette forum, as it relates to the oil filter bypass valve.
> And the Olds is set at only 5 PSI.
>
> "Today's engine has very tight tolerances, two stage oil pumps and high flow lubrication system requirements. The proper match of
> oil filter to engine application is more important than it has ever been in the past. The use of a replacement oil filter with an
> internal bypass valve opening pressure specifications of 15 PSI (100 kPa) or less, allows debris to circulate in the engine causing
> damage to bearings and other tight tolerances areas, which may result in premature engine failure."
>
> https://www.corvetteforum.com/forums/c7-z06-discussion/4119585-oil-filter-bypass-valve-is-important.html
> https://www.corvetteforum.com/forums/attachments/c7-z06-discussion/48268771d1522338334-oil-filter-bypass-valve-is-important-2012-201
> 7-corvette_-service-bulletin_-17-na-157.pdf
> --
> Bill Wevers
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
