When are oil restrictors needed?
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,033
Likes: 0
From: Tracy California
St. Jude Donor '05
When are oil restrictors needed?
If I'm switching from a Hydraulic Roller cam to a solid Roller Cam. Do I need to be concerned about oiling?
Thanks
KM
Thanks
KM
Le Mans Master
Joined: Feb 1999
Posts: 5,877
Likes: 1
From: Park Ridge IL
Re: When are oil restrictors needed? (88-406)
You don't need to be concerned about oiling, you do not necessarily need oil restrictors, but you do have the option. As you probably know, with a solid roller cam/lifters, the need for oil at the top end is reduced since it is only needed for lubrication and cooling, not for keeping the lifter pumped up. If this is a street engine, I would lean towards the conservative side if you do decide to run restrictors. Most racers with solid cams run a .060" restrictor, but that's pretty small in my opinion if durability is a prime concern, as it usually is on a street engine. I run .125" holes in my restrictors. It probably puts a little more oil than necessary up top, but it's certainly not excessive. It does ensure adequate lubrication, as well as sufficient flow to keep the springs cool. I have also had good results with .090" restrictors, but I'd rather be safe than sorry with this motor.
If your valve covers have valve spring oilers, then .060" is probably fine on the street since the springs are getting their own dedicated supply of oil. My covers have oilers but I don't use them. You really only need them for endurance reasons, circle track, etc with steady high-rpms with high valve lifts.
[Modified by Monty, 10:46 AM 10/23/2002]
If your valve covers have valve spring oilers, then .060" is probably fine on the street since the springs are getting their own dedicated supply of oil. My covers have oilers but I don't use them. You really only need them for endurance reasons, circle track, etc with steady high-rpms with high valve lifts.
[Modified by Monty, 10:46 AM 10/23/2002]
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: When are oil restrictors needed? (88-406)
Buy your solid roller lifters and read the directions!:) Crane Pro's tell you not to run any restrictors. I already installed the motor with restrictors when I came across that tid bit of info. I used the large r hole restrictors. I don't know which. but probably in the .125 range. I'm just using the normal melling pump - Taken apart and polished out with one thin spring shim. the pressure is nearly 80 psi when the motor is cold
I like the nice high oil pressure that comes from installing restrictors. With 10w-30 and 200 degrees water temp I still have 65 - 70 pounds cruising down the freeway.
What are the specs on your solid roller.
[Modified by gkull, 11:17 AM 10/23/2002]
I like the nice high oil pressure that comes from installing restrictors. With 10w-30 and 200 degrees water temp I still have 65 - 70 pounds cruising down the freeway.
What are the specs on your solid roller.
[Modified by gkull, 11:17 AM 10/23/2002]
Melting Slicks
Joined: Sep 2000
Posts: 3,099
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From: PITTSBURGH PA
Cruise-In IV Veteran
Cruise-In V Veteran
Re: When are oil restrictors needed? (gkull)
i personally do not think you need the restictors unless this is a all out race motor i say flood the top end with oil just like stock and those solid lifters on the street will last imo :cheers:
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,033
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From: Tracy California
St. Jude Donor '05
Re: When are oil restrictors needed? (gkull)
Gkull
My cam specs are 250/260@.050, Lift 607/608 112LSA.
Are the restrictors something that a machinist has to install? or? Oh and thanks for the other info guy's!
KM
[Modified by 88-406, 7:59 PM 10/23/2002]
My cam specs are 250/260@.050, Lift 607/608 112LSA.
Are the restrictors something that a machinist has to install? or? Oh and thanks for the other info guy's!
KM
[Modified by 88-406, 7:59 PM 10/23/2002]
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: When are oil restrictors needed? (88-406)
I installed my own. It's best to have the motor out on a stand. On the back of the block above the crank shaft. You should have allen plugs probably gooped inplace. Just remove them and install your oil restrictor. Just go with a larger size.
:) That cam ought to do it! Are those lifts with 1.5 and your installing 1.6?
[Modified by gkull, 12:55 PM 10/24/2002]
:) That cam ought to do it! Are those lifts with 1.5 and your installing 1.6?
[Modified by gkull, 12:55 PM 10/24/2002]
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,033
Likes: 0
From: Tracy California
St. Jude Donor '05
Re: When are oil restrictors needed? (gkull)
Gkull
Yes sir! I need to double check my piston/valve clearance though, but I plan on installing 1.6's. However I seem to recall being able to clear .650'ish with my current setup.
Anyone have any thoughts on using 1.5's and 1.6's for my roller rockers?
KM
[Modified by 88-406, 4:19 PM 10/24/2002]
Yes sir! I need to double check my piston/valve clearance though, but I plan on installing 1.6's. However I seem to recall being able to clear .650'ish with my current setup.
Anyone have any thoughts on using 1.5's and 1.6's for my roller rockers?
KM
[Modified by 88-406, 4:19 PM 10/24/2002]
