oil restrictors
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oil restrictors

  1. #1
    Led
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    Default oil restrictors

    BBC Solid Roller Cam, what size? Or Plug them and let it flow?

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    LP-25.com Infomaniac's Avatar
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    Don't everyone speak up at once.
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    Let her RIPPPPPP.











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    If it were mine, I wouldn't run them. But then again, I'm much better at breaking things then I am at building them.

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    I use the Stefs pair.

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    OK, I'll throw myself under the bus and then you can all throw rocks at me.
    But let me explain why I say NO RESTRICTORS! Specially on lake boat.

    The whole restricted oil supply thing was started by Grumpy Jenkins with his small block Vega ProStock. Partially due to the aluminum rods and big journal clearances and the need for oil supply to the crank, along with his desire not to pump any more oil than 100% necessary, and restrict the amount draining back down over the crank.
    But the single biggest reason he resricted the gallery was the lifters.

    GM originally designed the lifters to supply enough oil for the skid ball rockers, They need to be flooded or they fry. Specially as the spring presures climb, and the RPMs go thru the roof. The hyd lifters did that very well. The solid used a similar design that had what was called the Eaton inertia piddle valve. It moved roughly the same amount of oil to the rockers as the hyd lifter. Both moved way more than was needed for roller rockers, specially in a drag deal. It was all because of the skid ball rockers.

    GM later made a solid for high RPM roller rocker deals called the edge orfice lifter. It flowed considerable less oil than the Eaton inertia lifter.

    Between the lifter designs of the day, the fact that the Vega was a drag only deal, that he wanted to restrict oil anywhere he could, that he wanted the vast majority of the oil he was pumping at the crank, and that it spun inn the excess of 9500 Rs, he restricted the oil galleries in the thing and it became an immediate fad and within the year 10 companies are selling restrictors. There is never a shortage of monkey see, monkey do in engine building.

    If you like your springs and lifters and pushrod tips, leave the out the restrictors.
    If its strictly a drag deal, its your call, but not too sure what you gaining with them. Specailly with a priority main block. You can't even use the "I love my crank" excuse. Personally, I don;t make enough money to get all that hung up on the amount of oil I am flowing unless its obviously too much.

    Notice how the oil hole is in the relief band? Full time oil supply metered inside by the hydaulics internals, or on a solid, the eaton inertia valve. This is the lifter you want if you run skid ball rockers.


    Edge orfice lifter. Common on almost all solid rollers today and some flat tappet lifters. This design only allows as much oil as can squeeze by between the lifter bore and the lifter. At low RPM its hardly anything, and if restricted its even less.
    This all the restriction you want or need.




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    Last edited by gn7; 10-18-2012 at 04:59 PM.

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    No restricters.
    Well, lake or drag?
    Wags

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    gn7
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    Quote Originally Posted by wagspe208 View Post
    No restricters.
    Well, lake or drag?
    Wags
    I agree wags. I think I would phrase it as idling time or very little. I have run the restrictors in an endurance deal but the Rs are always up, and it seems to keep oil flowing enough to keep the springs from dying although we just removed them, and I doubt they will go back in. Wizbang says he runs them in the K boat, but with Charlie driving, its either 9000, or the engine is turned off.
    On lake boat, NO WAY!



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    I think GN7 and Wags are both correct that in a lkae boat, no.

    Sorry I spoke so soon.

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    Quote Originally Posted by gn7 View Post
    I agree wags. I think I would phrase it as idling time or very little. I have run the restrictors in an endurance deal but the Rs are always up, and it seems to keep oil flowing enough to keep the springs from dying although we just removed them, and I doubt they will go back in. Wizbang says he runs them in the K boat, but with Charlie driving, its either 9000, or the engine is turned off.
    On lake boat, NO WAY!
    I run restrictors. never had a problem.

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    gn7
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    Quote Originally Posted by jimclauss View Post
    I run restrictors. never had a problem.
    So have I Jim. How much idling and 3000 rpm cruising do you do with that thing?
    Like I said, long high rpm running can put too much oil in the rockers even with the edge orfice lifters. But I don't suggest restrictors and edge orfice rollers in a lake boat.

    The only thing that really suffers from low oil flow in the covers is the springs. The rockers can run in a fog. The tips don't need much more that a spit every cycle to make them happy. But the springs are dependent on the oil for cooling. If you running spring sprayers you could shut the lifter oil off completey. The lifter doesn't need it unless you run pressured lifters, in which case they tell you not to restrict the oil. Ford FE solid lifter blocks have no oil supply to the lifter gallery at all. Flat or roller, the lifter doesn't need oiling unless you have pressurized rollers.
    When the rockers had skid balls, they were the number one thing. In a roller rocker deal, its the springs.



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    Last edited by gn7; 10-18-2012 at 08:43 PM.

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by gn7 View Post
    So have I Jim. How much idling and 3000 rpm cruising do you do with that thing?
    Like I said, long high rpm running can put too much oil in the rockers even with the edge orfice lifters. But I don't suggest restrictors and edge orfice rollers in a lake boat.

    The only thing that really suffers from low oil flow in the covers is the springs. The rockers can run in a fog. The tips don't need much more that a spit every cycle to make them happy. But the springs are dependent on the oil for cooling. If you running spring sprayers you could shut the lifter oil off completey. The lifter doesn't need it unless you run pressured lifters, in which case they tell you not to restrict the oil. Ford FE solid lifter blocks have no oil supply to the lifter gallery at all. Flat or roller, the lifter doesn't need oiling unless you have pressurized rollers.
    When the rockers had skid balls, they were the number one thing. In a roller rocker deal, its the springs.
    I agree

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    If you read Jesel tech notes they say never restrict oil to ANY Jesel product.
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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by Infomaniac View Post
    If you read Jesel tech notes they say never restrict oil to ANY Jesel product.
    Don't use jessel, use Crower, EPD,TD ( but don't think I would have a problem with them either) you can get away with anything with a quarter mile deal, try it with a circle boat at 6,000 to 8000 for a long period of time and see now much oil is in the upper end of the engine even with restricters.

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