Straight from the box:
"Important Pressure Relief Valve Spring Requirements
Use the optional purple (65psi) pressure relief spring for 6.1L Hemi Engines.
The installed Yellow (50psi) relief spring is the stock springs for use with 5.7L Hemi engines".
I read that as the Melling Oil Pump does supply an increase in pressure if you use the optional purple springs for 65psi where the stock spring is only 50psi.
Only used the purple spring so I'm sorry to say not sure what happens with the others. Ultimate goal for me is a dry sump or a different pump, different oil weight all together.
I'll keep my money, guns, and freedom, you can keep the change.
I don't think Melling is realizing that a modded 5.7 revs to 6400 just like a 6.1. I would use the purple spring.
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Or the added pressure is for the oil squirters...
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The SRT engine squirts oil to the bottom of the pistons for cooling and maybe that is why it needs more pressure. The higher the pressure, the more hp it takes to run the pump.
I remember when anything over 60 would foam your oil We're in a better place these days
Pressure is the opposite of flow (or due to the lack of flow) Flow is whats important. Pressure also creates heat.
Mod List: http://www.lxforums.com/board/showth...35#post2353135
given the *exact same* engine (swapping pumps and keeping the same oil weight), a higher pressure reading on the oil galley means that you actually are getting more flow.
Increasing viscosity to get more pressure reduces flow.
From everything that i have seen.. the Melling is just a stock replacment, no? The e-mail i got back from them said they don't have any increased flow setups yet....
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Yep, pressure and flow are realated, and with a given pump, more pressure will mean less flow... so if you've got .015" clearance in all your bearing journals, you'll have plenty of flow and very little pressure. The engine though, won't stay together at 6000 rpms.
I'm with Erik, I want both Still I'm not convinced that anything over 60 - 65 psig matters much for us.