oil restricters

[MONGO510]

I have tried to find info on restricting the oil flow to the upper end, but get 0 hits. I have tried " oil restrictors, oil restricters, oil gallery restricters, cam oil gallery restrictors,ETC..." 0 hits!

What I need to know is; do I need to restrict the oil flow to my top end when building a full roller engine? I have a solid roller Howards cam, and Crower stainless full roller rockers. Should I install oil gallery restrictors?

From what I've been reading I understand i dont really need a hi-vol oil pump. Standard Hipro is adequate?

 

Thanks,

John

[grumpyvette]

the theory behind oil restrictors is that limiting the oil flow to the heads helps maintain the flow to the bearings`and reduces windage loses, in PRACTICE, thats proven time and again to be wrong, in that controlling the oil flow is more effective than restricting the oil flow

failure to supply enought oil to cool the rockers and springs insures valve train failure on a street car, or a track application, while it may work on a drag only application even then its prone to parts breakage

install a properly designed high capacity, baffled oil pan, windage screen, crank scraper, and the MATCHED high volume oil pump, get your clearances correct and you won,t have any bearing failures OR valve train failures

you generally won,t need or want to use a high volume oil pump with a stock oil pan or without a windage screen

 

standard volume pump gears are about 1.2" long the high volume pump gears are about 1.5 inches long (depends on manufacturer)

heres the discriptions right from chevy

 

12555884

SBC Oil Pump, High Pressure Z28/LT1. Production high-pressure oil pump with 1.20" gears.Will produce 60-70 psi oil pressure. Does not include screen. The pickup tube dia. is 5/8" for this pump.

62.17

 

14044872

SBC Oil Pump, High-Volume. This high-volume pump has1.50" long gears.It has approximately 25% more capacity than a production pump at standard pressure. Does not include screen.

 

 

the Z28 pump will work fine in 90% of the applications, theres no advantage to the high PRESSURE pump, theres very little if any advantage to the high VOLUME pump in your application

 

Here is a good link on the M-Select pumps. http://www.melling.com/select/oil_pumps_gm_chevy_small_block.asp

 

think # 10990 or #10990C but only with matching mods like the 7-9 qt oil pan and windage screen

 

think 10552 in all the street and strip engines with stock oil pans

[jakeshoe]

I would think restricting flow to some areas is "controlling" the flow.

 

John,

This is a "it depends" scenario.

 

Valve spring life is reduced when you cut down the oil to them, roller rocker life as well.

Isky recommends no restrictors run with their roller lifters.

 

If this is a hydraulic roller motor, absolutely do not run restrictors.

 

Higher end motors that run restrictors typically use a spring oil in the valve covers to spray oil on the springs and keep them cool.

The guys who have really messed with this use varying size restrictors so that each lifter bank gets the same amount of oil, etc.

 

If this motor will see street use at all I wouldn't run restrictors.

If it's an all out race deal with limited time idling, no extended operation, then the restrictors have a place.

[jakeshoe]

Another thing to add,

the greater precision nowadays has resulted in the lifters themselves being a controlled restriction, most good roller lifters now control the amount of oil to the upper end, but not overly so as the oil gallery restrictors have a tendecy to do (especially on a SBC engine).

[MONGO510]

Great info fella's.

Thanx