Oil Restrictors in GM block, yes or no?

February 05, 2021, 09:09 PM

Will Harrison

quote:
Originally posted by adv ET 266:
I would run at least 0.10” unless you have measured you lifter to bore clearance. If you have and the clearance is 0.001 to 0.0015, you can leave them out. Some never check that and hot oil is gushing all over the place. Buy a small bore dial bore gauge, measure it yourself and be certain.

it's .0015, I have resttictors and they are drilled to .100 right now that I planned on using

February 05, 2021, 09:13 PM

Will Harrison

quote:
Originally posted by Goob:
Street motor no restrictors, drag race motor, yes restrictors, and I'll go .100" to .125" because I like to party.
Oil is the coolant for the upper valve train.

Again though, with all the variables in engine purpose and goals for HP production, we could talk for days on end about different oil control strategies, I'm commenting on common use parameters. Sporty street and bracket racing.

I will add this.....since you are running that 20-50 syrup for oil, you can probably do without the restrictors.

we run our motors quite a bit hotter then a lot of people, stage at 170, mainly because we run back to back a lot. Like 12-15 minutes between runs for several rounds. So my 20-50 is pretty watery by the end of the day

February 05, 2021, 09:19 PM

Mike Rietow

Melling makes billet oil pumps. I've been running one since 2008. Everything I do gets one.

sbc, the hot ticket is standard volume, high pressure.

MADE IN USA, some of the other options, not so much.

February 06, 2021, 07:11 AM

Ron Gusack

quote:
Originally posted by Will Harrison:
quote:
Originally posted by Ron Gusack:
quote:
Originally posted by Will Harrison:
quote:
Originally posted by Ron Gusack:
I stopped using galley restrictors and started using restricted push rods. No problems. Using Crower hippo lifters. I sent them to Crower after 327 runs for a rebuild. Crower said they look new and didn't want to rebuild.
how small is the pushrod hole? This has trend .165 wall .375 diameter pushrods

These are Smith Brothers .375 with .080 restriction. I can't remember the wall thickness but I can look it up if you need it. I had them cut keeper grooves in them for rev kit springs so they're probably .165 minimum.
ok. By my math the hole is these pushrods is only .045, thank you

Okay, I dug out the paperwork. Mine are only .083 wall with a .040 restriction at the rocker end of the pushrod.

February 06, 2021, 11:05 AM

Will Harrison

quote:
Originally posted by Ron Gusack:
quote:
Originally posted by Will Harrison:
quote:
Originally posted by Ron Gusack:
quote:
Originally posted by Will Harrison:
quote:
Originally posted by Ron Gusack:
I stopped using galley restrictors and started using restricted push rods. No problems. Using Crower hippo lifters. I sent them to Crower after 327 runs for a rebuild. Crower said they look new and didn't want to rebuild.
how small is the pushrod hole? This has trend .165 wall .375 diameter pushrods

These are Smith Brothers .375 with .080 restriction. I can't remember the wall thickness but I can look it up if you need it. I had them cut keeper grooves in them for rev kit springs so they're probably .165 minimum.
ok. By my math the hole is these pushrods is only .045, thank you

Okay, I dug out the paperwork. Mine are only .083 wall with a .040 restriction at the rocker end of the pushrod.

this method actually makes a lot of sense. I'm thinking I may prime the engine on the stand with and without the restrictors in the galley and see what the difference is. There's a good chance the system is already restricted more the pushrod then the the galley restrictors would do anyway.

Thank you to everyone that answered