Oil pump thrust plate

Drewster

wish i had a clone.
May 31, 2001
707
50
28
51
Simi Valley, SoCal
Any flow or pressure benefit of running a thrust plate over a polished flat oil pump cover? I understand the plate is so you wont need to polish out the groves but I was thinking of turbulence / cavitation caused at the relief port of the stock cover. Maybe GM engineers already thought of that and that's why the relief port is a funky hockey stick looking shape. I know the less gaskets the better so that's why I thought Id ask.
 

turbobitt

Well-Known Member
Feb 14, 2002
2,376
370
83
46
Southington CT
Any flow or pressure benefit of running a thrust plate over a polished flat oil pump cover? I understand the plate is so you wont need to polish out the groves but I was thinking of turbulence / cavitation caused at the relief port of the stock cover. Maybe GM engineers already thought of that and that's why the relief port is a funky hockey stick looking shape. I know the less gaskets the better so that's why I thought Id ask.
Some of those features are there to act as a debris trap so the gears don’t chew up the thrust surface or worse lock up the gears. If the oil is perfectly clean it’s not an issue but you just can’t bank on that.
AG.


Sent from my iPhone using Tapatalk
 

Drewster

wish i had a clone.
May 31, 2001
707
50
28
51
Simi Valley, SoCal
This is what I’m comparing. Maybe it no gain if there is no scoring to correct. Just wondering



Sent from my iPhone using Tapatalk
 

earlbrown

runs with scissors
May 26, 2001
7,062
1,273
113
48
lagrange, GA
That plate is a band-aid for a scored oil filter adapter. It's also a way to add two mismatches on the high pressure feed to the engine. (and double the odds of having a leak at the gasket(s) between the cover and the adapter. There's no performance gain to be had adding that under a smooth filter housing.


That goofy line looking groove isn't a debris trap, it's a path for high pressure oil to wet the fixed pin they driven gear rides on.
 
  • Like
Reactions: Turbo6inKY

turbo nasty

Turbo Dojo / MNTR
Jul 19, 2001
8,216
420
83
St Paul, MN
Plate is great and a way to keep the end play of of the oil pump gear in check. The gears WILL wear into the alum oil filter adapter and end play will increase. As far as leaks with the plate, Ive never had a leak and have built several front covers and FWIW so did/does Jim Ruggles, TA, DLS, ETC ETC and it wasnt a issue. Theres the booster style plate as well as a wear plate. No way I would build a oil pump without one! Over the years of messing with TR's ive pulled front covers off of cars with less than 25k miles as owners wanted peace of mine with the timing set being replaced and of course the oil pump was gone though. Always found scoring on the oil filter housing!
 
Last edited:

Steve V

Steve V's Automotive 757 560 2782
Jan 5, 2004
4,118
432
83
Elberon,Va
Plate is great and a way to keep the end play of of the oil pump gear in check. The gears WILL wear into the alum oil filter adapter and end play will increase. As far as leaks with the plate, Ive never had a leak and have built several front covers and FWIW so did/does Jim Ruggles, TA, DLS, ETC ETC and it wasnt a issue. Theres the booster style plate as well as a wear plate. No way I would build a oil pump without one! Over the years of messing with TR's ive pulled front covers off of cars with less than 25k miles as owners wanted peace of mine with the timing set being replaced and of course the oil pump was gone though. Always found scoring on the oil filter housing!
Agree completely, but I would use a better plate(wink, wink) that's truely flat unlike the Melling one.
 
  • Like
Reactions: turbo nasty

turbo nasty

Turbo Dojo / MNTR
Jul 19, 2001
8,216
420
83
St Paul, MN
Agree completely, but I would use a better plate(wink, wink) that's truely flat unlike the Melling one.
Steve good point every Melling P 201 ive used has always needed sanding to be flat. Thats why...insert commercial....Theres Turbo Nastys/Turbo Dojos super flat superior oil pump wear plate available for those oil pump rebuilds!! LOL
 
  • Like
Reactions: Steve V

Steve V

Steve V's Automotive 757 560 2782
Jan 5, 2004
4,118
432
83
Elberon,Va
Steve good point every Melling P 201 ive used has always needed sanding to be flat. Thats why...insert commercial....Theres Turbo Nastys/Turbo Dojos super flat superior oil pump wear plate available for those oil pump rebuilds!! LOL
Steve V's Automotive is a paying vendor, I will plug them for you!
 
  • Like
Reactions: turbo nasty

salvageV6

Daily Driver
May 25, 2001
14,903
351
83
63
Connecticut
I've had the kenne Bell plate on one of my cars for 30 years.

Same oil pressure at 200K miles as it did with 18K miles when I put it on there.

I think there's was anodized aluminum.

About the only place on my car that doesn't leak. ;):p
 

chriss4655

Member
Jan 21, 2009
224
20
18
Better hot idle oil pressure , steel expands less than aluminum keeping the clearances tighter when heat soaked ! IMO
 
  • Like
Reactions: Steve V
Top Bottom