Re: Race engine oil viscosity
[Re: madscientist]
#3130932
03/20/23 07:40 PM
03/20/23 07:40 PM
|
Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
|
Valve spring pressures and idle RPM can have a lot to do with how soon and how hot the oil temps will get, especially when warming the motors up on a engine dyno
Last edited by Cab_Burge; 03/20/23 07:41 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: Race engine oil viscosity
[Re: RapidusMaximus]
#3130933
03/20/23 07:42 PM
03/20/23 07:42 PM
|
Joined: May 2019
Posts: 722 Lake Villa Il
INTMD8
super stock
|
super stock
Joined: May 2019
Posts: 722
Lake Villa Il
|
I broke mine in on 20w-50 brad penn but oil pressure was pretty high.
1150 idle, 49psi
2000rpm 70psi
7600rpm 78psi
(I think it was just going through the bypass pretty early)
I've since switched to Royal Purple XPR 5w-30 and will dyno again soon.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
|
|
|
Re: Race engine oil viscosity
[Re: polyspheric]
#3130940
03/20/23 08:20 PM
03/20/23 08:20 PM
|
Joined: Mar 2006
Posts: 9,982 MI, usa
dvw
master
|
master
Joined: Mar 2006
Posts: 9,982
MI, usa
|
A joke: the 1st number in a multi-viscosity, or the only number in single viscosity is the time in seconds it takes when cranking a cold engine for oil pressure to reach the last connecting rod. 20W50: 20 seconds. Not even close. Doug
Last edited by dvw; 03/20/23 08:24 PM.
|
|
|
Re: Race engine oil viscosity
[Re: AndyF]
#3130991
03/21/23 12:01 AM
03/21/23 12:01 AM
|
Joined: Sep 2005
Posts: 632 Deep DEEP SOUTH
LAD 524
mopar
|
mopar
Joined: Sep 2005
Posts: 632
Deep DEEP SOUTH
|
I ran an oil temp sensor in my Duster. It takes a long time for oil to heat up. Usually takes about 10 miles of driving before oil is up to temp. Oil doesn't get warm in the pits or driving to the staging lanes. Same here, it takes time for oil temp to warm up. I see mostly between 180-220 temps on the street depending on ambient/engine temp and load and it takes a little while to get it there. Thing is...I am told the zinc/phos/wear additives are designed to do their thing when the oil is at operating temp. Or in other words they are pretty much along for the ride till that time.
|
|
|
Re: Race engine oil viscosity
[Re: LAD 524]
#3131017
03/21/23 08:16 AM
03/21/23 08:16 AM
|
Joined: Jan 2003
Posts: 8,225 Plymouth, MI
Blusmbl
master
|
master
Joined: Jan 2003
Posts: 8,225
Plymouth, MI
|
If your bearing clearances and sizes support it, lighter weight oil is free horsepower.
I have run into issues on OEM stuff where if the journal area is marginal for the load on the bearings, that heavier viscosity oil when at temp is needed to keep the bottom end safe. That's one of the reasons why a bunch of new cars require oils with a wide spread, like 0w40 or 5w50.
I run 15w50 Mobil 1 in my motor because it's cheap at Wal Mart and has enough zinc for flat tappet cams. I'd prefer a 5 or 10w40 for cold starts since mine is mostly a street car, but my wallet prefers the 15w50. lol
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
|
|
|
Re: Race engine oil viscosity
[Re: dvw]
#3131045
03/21/23 10:21 AM
03/21/23 10:21 AM
|
Joined: Mar 2003
Posts: 2,541 PA
moparacer
master
|
master
Joined: Mar 2003
Posts: 2,541
PA
|
I warm mine up to 150 before I make a pass. I have a gas primer so I can build heat quickly without wasting alky. Last year double entered running the guts out of it sometimes the oil would get close to 200. I run an engine oil cooler since I have a tall fill.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
|
|
|
Re: Race engine oil viscosity
[Re: dvw]
#3131061
03/21/23 11:10 AM
03/21/23 11:10 AM
|
Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,219
New York
|
Perhaps you didn't notice the first word, "joke". What does "not even close" mean to humor?
Boffin Emeritus
|
|
|
Re: Race engine oil viscosity
[Re: RapidusMaximus]
#3131063
03/21/23 11:12 AM
03/21/23 11:12 AM
|
Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,219
New York
|
Oil temperature tracks load, not water temperature or minutes of operation.
Power: cold water & hot oil.
Boffin Emeritus
|
|
|
Re: Race engine oil viscosity
[Re: polyspheric]
#3131092
03/21/23 12:28 PM
03/21/23 12:28 PM
|
Joined: Dec 2005
Posts: 12,318 Fulton County, PA
CMcAllister
Mr. Helpful
|
Mr. Helpful
Joined: Dec 2005
Posts: 12,318
Fulton County, PA
|
Oil temperature tracks load, not water temperature or minutes of operation.
Power: cold water & hot oil. This. From Stockers to Pro Stock. Fastest way is pre-heat the oil. Come out of the lanes cold. You have to tune for that. We're using gauges to measure down to 60 degrees water temp. Brackets, .90, dial in consistency - warm it up. Keep the temp swing from first round to the final to a minimum. 10w30 is for bracket cars. Class cars go thinner. Haven't had a quart of 20w50 in my shop for decades. Stopped using dino oil too. Made a difference Eliminating internal leaks and unnecessary oil flying everywhere except to the crank is part of doing that. Some builders tighten clearances in the bottom end as well. Better oils than what we had years ago also helps
If the results don't match the theory, change the theory.
|
|
|
Re: Race engine oil viscosity
[Re: polyspheric]
#3131163
03/21/23 03:51 PM
03/21/23 03:51 PM
|
Joined: Mar 2006
Posts: 9,982 MI, usa
dvw
master
|
master
Joined: Mar 2006
Posts: 9,982
MI, usa
|
Perhaps you didn't notice the first word, "joke". What does "not even close" mean to humor? Nope missed it completely. That response did sound strange coming from you. Must have read it after the bar . On vacation in Key West, lol Doug
|
|
|
Re: Race engine oil viscosity
[Re: dvw]
#3131168
03/21/23 04:30 PM
03/21/23 04:30 PM
|
Joined: Feb 2008
Posts: 725 Central TEXAS!!!!
sr4440
super stock
|
super stock
Joined: Feb 2008
Posts: 725
Central TEXAS!!!!
|
Am I the only one who has an oil pan heater? Roll car out of trailer, plug in heater, wait 30 mins, start car when oil gets to 160.
Joe
Without Data, you’re just another guy with an opinion.
|
|
|
Re: Race engine oil viscosity
[Re: sr4440]
#3131179
03/21/23 05:23 PM
03/21/23 05:23 PM
|
Joined: Dec 2005
Posts: 12,318 Fulton County, PA
CMcAllister
Mr. Helpful
|
Mr. Helpful
Joined: Dec 2005
Posts: 12,318
Fulton County, PA
|
Am I the only one who has an oil pan heater? Roll car out of trailer, plug in heater, wait 30 mins, start car when oil gets to 160.
Joe Nope. We have cars with heaters on the pan, accusump and trans pan. And I'm gonna put one on the rear when I get a chance. Cheap ET.
If the results don't match the theory, change the theory.
|
|
|
Re: Race engine oil viscosity
[Re: moparx]
#3131441
03/22/23 01:19 PM
03/22/23 01:19 PM
|
Joined: Jan 2003
Posts: 19,544 Las Vegas
Al_Alguire
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 19,544
Las Vegas
|
FWIW in the Vette we run 0 weight oil...Bearings have been in the car for the last 5 years. In my bracket junk we use 5w20
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
|
|
|
Re: Race engine oil viscosity
[Re: Al_Alguire]
#3131444
03/22/23 01:32 PM
03/22/23 01:32 PM
|
Joined: Sep 2003
Posts: 20,272 north of coder
moparx
"Butt Crack Bob"
|
"Butt Crack Bob"
Joined: Sep 2003
Posts: 20,272
north of coder
|
for whatever this is worth, my brother inherited a buick from his mother-in-law years ago when she passed. he drove it a bunch of miles using 10-30, changed oil and filter religiously, and it ran like a top. after it topped 130k or so, he figured it was getting a little worn, so he put in the same brand oil he had been using before, but this time, 10-40. upon fire up, it had lifter noise it never had before. as there was nothing on the dash except an idiot light, he had no idea what the pressure was. he drove it for a week or two, and it still had the noise. he dumped the 10-40 and went back to 10-30, and the noise was gone ! lesson learned. he used 10-30 until he wore the car out, and no more noise.
|
|
|
Re: Race engine oil viscosity
[Re: dragon]
#3131474
03/22/23 03:19 PM
03/22/23 03:19 PM
|
Joined: Jan 2004
Posts: 4,634 Motor City
6PKRTSE
master
|
master
Joined: Jan 2004
Posts: 4,634
Motor City
|
I just use 10W30 conventional in everything except my Diesel. I use 15W40 Rotella.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
|
|
|
Re: Race engine oil viscosity
[Re: dragon]
#3131485
03/22/23 04:00 PM
03/22/23 04:00 PM
|
Joined: Mar 2006
Posts: 9,982 MI, usa
dvw
master
|
master
Joined: Mar 2006
Posts: 9,982
MI, usa
|
Does anyone run a oil pan surface heater with a diaper??? I thought about it. I have one. But didn't know how it would do with the padding. Doug
|
|
|
|
|