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DRR S/Pro |
It seems like everywhere and everyone you ask has a different opinion. Mark 4 GM block, bracket motor, isky ez roll lifters, shaft rockers with spring oilers. Yes or no on oil restrictors at the back? .991 60' 4.36 @ 159 so far..... 6.86 @ 198 trying for more...... 533" single carb 235" Harrison 4-link | ||
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DRR Pro |
yes no less than .100 honesty is the best policy,insanity is a better deffense 1.036, 6.16@ 224 | |||
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DRR S/Pro |
No oil restrictors. Haven't used them in years. Bob | |||
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DRR Top Comp |
Sure, why not Gen 4 block? Oil draining back on the rotator is friction,... correct? I always ran 100's on the two BBC's I ran. Both made decent power steel heads, utilizing that approach... 427 - 454 | |||
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DRR Trophy |
Back in the day they wanted the oil restricted to the lifters and thus the rockers. Keep it on the bearings. Now they want plenty of oil to the lifters to prevent wear. I stopped restricting the oil. | |||
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DRR Trophy |
Will, In order to answer you restrictor question I would ask you what pump are you using, what weight oil and how many gallons you run in the sump. And also due you use parachutes? Answer the above and It will help answer the restrictor question. A high volume pump can empty a pan very quickly and load the heads with oil. If not enough oil in the pan and you pull the chutes you can run the remaining oil forward thus causing cavitation of the oil going to the bearings. Not a good thing. | |||
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DRR Pro |
No on the restrictors, the lifters them selves restrict oil to the top end. On the second part, the old story of a high volume pump "filling the heads up with oil" is BS....total and complete. Hate to address it like that but it gets old seeing it. Regardless of the output of the pump, it will only move as much oil as the leakage in the engine will allow. If you have too much oil staying in the rocker arm area of the heads, you have a drainback issue, NOT A PUMP ISSUE. You need to correct drain back. I ran a 7 quart wet sump pan on my last engine with a Titan pump, very well known for the volume of oil they can move. NEVER AN ISSUE with "too much oil on the top end, NONE... Sorry to go off like that, but I just get tired of that being tossed around like it's gospel when it's been proven wrong.... Mark Goulette Owner/Driver of the Livin' The Dream Racing dragster www.livinthedreamracing.com "Speed kills but it's better than going slow!" Authorized Amsoil Retailer | |||
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DRR Pro |
One more thing to add. If you're losing pressure on the top end under braking, you have the wrong pan.....or too little oil in it. Mark Goulette Owner/Driver of the Livin' The Dream Racing dragster www.livinthedreamracing.com "Speed kills but it's better than going slow!" Authorized Amsoil Retailer | |||
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DRR Trophy |
We test pans on our dyno weekly. We fab pans weekly. 47 plus years of fabrication. When I started , I welded and offset ground my own cranks in my own shop. Trust me son, I have seen it all. Did I say use oil restrictors? Please don't let the facts get in the way of what you believe. LOLThis message has been edited. Last edited by: TD1964, | |||
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DRR Pro |
Never said you said to use restrictors....that was an answer to Will.... I stand firm on my statement about oil on the top end though....not a pump issue, it's a drainback issue.... And we don't race dynos, dyno won't show what happens on a track.....hehehehhehe Had to throw that in there.....This message has been edited. Last edited by: Alaskaracer, Mark Goulette Owner/Driver of the Livin' The Dream Racing dragster www.livinthedreamracing.com "Speed kills but it's better than going slow!" Authorized Amsoil Retailer | |||
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DRR S/Pro |
moroso billet spur gear pump, Brad Penn 20-50, 7 quarts in Stef's kickout pan, no parachute. Motor will spin 7500 or so. .991 60' 4.36 @ 159 so far..... 6.86 @ 198 trying for more...... 533" single carb 235" Harrison 4-link | |||
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DRR S/Pro |
With stock blocks and Moroso pumps I used restrictors and drilled the holes out to a larger size. Did not have any problems using them that way. | |||
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DRR Sportsman |
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. | |||
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DRR Pro |
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. "Despite the high cost of living, it remains popular." Dave Cook N375 | |||
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DRR S/Pro |
how small is the pushrod hole? This has trend .165 wall .375 diameter pushrods .991 60' 4.36 @ 159 so far..... 6.86 @ 198 trying for more...... 533" single carb 235" Harrison 4-link | |||
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DRR Elite |
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. 2005 2000lb 4 link dragster home brew 582 BBC Dart 355 1.058 2.98 4.629@149 6.094 7.310@185 | |||
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DRR Trophy |
I have made this comment before but when you order gears for your fancy a$$ Moroso billet pump you will get Melling parts shipped to your door. I would not be surprised if the cast pumps would maintain better tolerance in the heat cycle vs aluminum. | |||
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DRR Sportsman |
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. | |||
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DRR S/Pro |
dragsters are notorious for breaking pick ups and pump bases on cast iron pumps, so I use billet pumps only on dragster motors .991 60' 4.36 @ 159 so far..... 6.86 @ 198 trying for more...... 533" single carb 235" Harrison 4-link | |||
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DRR S/Pro |
ok. By my math the hole is these pushrods is only .045, thank you .991 60' 4.36 @ 159 so far..... 6.86 @ 198 trying for more...... 533" single carb 235" Harrison 4-link | |||
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