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Re: Oil viscosity choice for strip and street [Re: moparguy7074] #1338018 11/20/12 04:47 PM 11/20/12 04:47 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	Quote: Brad, would you know if the RP 5w-30 falls into the same category as M1? Honestly, I don't pay any attention to Royal Purple or Lucas Oil products since I have no interest in using either brand.

Re: Oil viscosity choice for strip and street [Re: BradH] #1338019 11/20/12 06:05 PM 11/20/12 06:05 PM
Joined: Mar 2009 Posts: 2,464 Sydney,Australia tex013 OP top fuel
tex013 OP top fuel Joined: Mar 2009 Posts: 2,464 Sydney,Australia	Brad ,everyone thanks for the replies and feedback. this saturday will probly be my last meeting till February,except possibly T&T. i will run the 20/50 and over Xmas dyno the motor back to back with the 10/40 . i guess my biggest worry is daily driving/highway use particularly when hot.the last 2 weekend of racing temp has been high 20's and into the 30's Celcius.and its not summer yet. Tex New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive

Re: Oil viscosity choice for strip and street [Re: tex013] #1338020 11/20/12 06:31 PM 11/20/12 06:31 PM
Joined: Jan 2003 Posts: 6,392 nielsville, minn. Q quickd100 master
quickd100 master Q Joined: Jan 2003 Posts: 6,392 nielsville, minn.	At home and at work I've been using shell rotella 15/40 HD diesel oil in everything for about 30 years and never had an oil related failure. In the winter around here I switch to 5/30.Dave

Re: Oil viscosity choice for strip and street [Re: BradH] #1338021 11/20/12 08:12 PM 11/20/12 08:12 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: I'll rephrase that and point out that it's not just M1; all the standard light-viscosity (5w30 and under) passenger car oils out today have been "watered down" w/ respect to their anti-wear additive packages that can mess w/ the cat converters. The stuff on the shelf of the local parts store these days is intended for my Honda mini-van, not a 700 HP street car. It sounds like you've had good luck w/ what you've done to date. Just be aware the latest API standards have applied yet another "hit" to passenger car oils in the name of the saving the environment. As usual, this thread has gone slightly off target. The OP is presently using a race oil, designed for race engine applications. The point is that in the past race oils usually included high viscosity oils, like 20/50 stuff. Todays race only oils are a lot better than they were 20 years ago and there is less "linkage" between "thick oils" and "race oils" than in the past. As an old conservative engine builder and racer, I have turned the page on this one - and aint lookin back! Fastest 300

Re: Oil viscosity choice for strip and street [Re: tex013] #1338022 11/20/12 08:29 PM 11/20/12 08:29 PM
Joined: Feb 2005 Posts: 4,314 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,314 Prospect, PA	Looks like Joe Gibbs would recommend a 0-20W or 5-20W racing oil

Re: Oil viscosity choice for strip and street [Re: moparguy7074] #1338023 11/26/12 02:00 AM 11/26/12 02:00 AM
Joined: Apr 2011 Posts: 8 Texas U UOP member
UOP member U Joined: Apr 2011 Posts: 8 Texas	Rotella T6 5w-40 here, run it in every vehicle I own. I like the viscosity range, but it doesn't hurt that it's a full synthetic for only $6.49/qt($27.95/gal). The only downside is that most stores don't carry it in quarts so they have to be special ordered (I use Oreilly), but I usually just keep a few gal jugs around.

Re: Oil viscosity choice for strip and street [Re: tex013] #1338024 11/26/12 11:37 AM 11/26/12 11:37 AM
Joined: Jan 2003 Posts: 10,000 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,000 Frostbitefalls MN (Rocky&Bullw...	Recommended oil way back in the day was 10w30 for flat tappet motors. About half the reason IMHO that we run thicker oils in our race motors is to cover up little problems like sucking a little air on launch in the oil pan, losing oil pressure during decel, etc. A lot of times it is such short duration that I don't think it registers on the gauge. But aerated oil is still a problem and the thinner it is the quicker the bearings will get hurt. I chose to play it safe and run 20w50 because of those potential problems. The last problem I had was a sheared off oil pump drive in the middle of a pass. At the lights going 152 mph and turning 7400 rpm, the gauge read zero. With a Torqueflite you have no choice but to leave it in gear and let the motor run all the way till you stop. The rod bearings were a tad ugly, but not to a point that they would fail soon. The mains looked great and were not replaced. I really like that Brad Penn 20w50 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: Oil viscosity choice for strip and street [Re: tex013] #1338025 11/26/12 02:56 PM 11/26/12 02:56 PM
Joined: Aug 2003 Posts: 43,185 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,185 Bend,OR USA	Quote: Brad ,everyone thanks for the replies and feedback. this saturday will probly be my last meeting till February,except possibly T&T. i will run the 20/50 and over Xmas dyno the motor back to back with the 10/40 . i guess my biggest worry is daily driving/highway use particularly when hot.the last 2 weekend of racing temp has been high 20's and into the 30's Celcius.and its not summer yet. Tex Tex, I use Valvoline 5W20wt non synthetic in my Duster, limited street and a lot of strip My bearing clearances are pretty loose, .0035+ on the rods and mains , My oil pressure reads right at 20 lbs at 850 RPM in gear with oil temps at or above 180F on the street 1200 RPM makes the oil pressure go up to 35 lbs and it has 50 lbs at 1500 RPM, 65 lbs at 7000 RPM There is some HP gains with low oil temps with the lightweight oils is what I found years ago, just what most bracket racers need Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Oil viscosity choice for strip and street [Re: Cab_Burge] #1338026 11/26/12 06:05 PM 11/26/12 06:05 PM
Joined: Mar 2009 Posts: 2,464 Sydney,Australia tex013 OP top fuel
tex013 OP top fuel Joined: Mar 2009 Posts: 2,464 Sydney,Australia	UOP,Cab ,Greg thanks for all replies. much to ponder. Greg i turn around 6300-6400 through the traps and have a deep sump.hopefully that should stop aeration etc on launch. Cab i drive the car every day so we will see with the 10-40.a few more hp won't hurt by the way it was in the 90's on saturday at the races thanks all Tex Last edited by Tex013; 11/26/12 06:11 PM. New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive

Re: Oil viscosity choice for strip and street [Re: tex013] #1338027 11/26/12 06:18 PM 11/26/12 06:18 PM
Joined: Aug 2003 Posts: 43,185 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,185 Bend,OR USA	I probally should state the HP gain versus losses results on thin multiweight oil versus straight wt. oils are based on a dyno tests that I did years ago. I was dyno testing the first motor I built for a customer who wanted it dyno tested and tuned, it was 1962 Dodge 390 HP 413 M.W. I broke the motor in on straight 30 WT Valvoline non detergent oil and then switched it to detergent 30 WT Valvoline, I was seeing a 10 HP gain on oil temps between 130F versus 160F + the hotter I got the oil temps(up to 190 F, no gains seen after that hot) before starting the pull the more HP it would make I later switch on other motors to using Valvoline 10W30WT multi grade and then to 5W30 and finally at 5W20WT, I saw no HP or torque gains based on oil temps on the lighter weight multi viscosity oils All the motors I tried doing pulls at 120 F with multi weight oils versus at or above 160F with the same motor and oil saw no measurable HP or torque gains For you bracket racers that see your cars pickup when hot lapping, what type and weights of oil do you use Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Oil viscosity choice for strip and street [Re: Cab_Burge] #1338028 11/26/12 07:04 PM 11/26/12 07:04 PM
Joined: Nov 2003 Posts: 7,348 Mt.Vernon ,Ohio VernMotor master
VernMotor master Joined: Nov 2003 Posts: 7,348 Mt.Vernon ,Ohio	"you bracket racers that see your cars pickup when hot lapping, what type and weights of oil do you use" Yes my car will pick up but I do not think it is oil temps. You have trans temps- rear end -wheel bearing-motor get heat in it and burns fuel better. I run 15-40 wt oil. all these things together make it pick up.

Re: Oil viscosity choice for strip and street [Re: VernMotor] #1338029 11/27/12 01:12 AM 11/27/12 01:12 AM
Joined: Mar 2009 Posts: 2,464 Sydney,Australia tex013 OP top fuel
tex013 OP top fuel Joined: Mar 2009 Posts: 2,464 Sydney,Australia	thanks Vern, i know what you mean re all things adding up.i'm licky i get a good heat soak/cycle driving out to the track Tex New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive

Re: Oil viscosity choice for strip and street [Re: VernMotor] #1338030 11/27/12 01:42 AM 11/27/12 01:42 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: "you bracket racers that see your cars pickup when hot lapping, what type and weights of oil do you use" Yes my car will pick up but I do not think it is oil temps. You have trans temps- rear end -wheel bearing-motor get heat in it and burns fuel better. I run 15-40 wt oil. all these things together make it pick up. My first pass of the day is always a bit slower... thats with driving it around to warm it up

Re: Oil viscosity choice for strip and street [Re: MR_P_BODY] #1338031 11/27/12 04:12 PM 11/27/12 04:12 PM
Joined: Aug 2003 Posts: 43,185 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,185 Bend,OR USA	I try to drive my car around enough before racing it at the track to get the oil and trans. temps. up to at least 130F, I run 75-90 WT gear oil in the rear and I do not have a temp. gauge in it so I don't have any idea what it runs at My car does not vary more than .02 on the ET from first run to last run, early morning to late afternoon,(unless the track is bad)5W20Wt motor oil Last edited by Cab_Burge; 11/27/12 04:12 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Oil viscosity choice for strip and street [Re: Cab_Burge] #1338032 11/27/12 05:51 PM 11/27/12 05:51 PM
Joined: Mar 2009 Posts: 2,464 Sydney,Australia tex013 OP top fuel
tex013 OP top fuel Joined: Mar 2009 Posts: 2,464 Sydney,Australia	MrP, my first pass is often the slowest - must need to blow the cobwebs out Cab,i wish my spread was so tight though with the 825 md it does seem more sensitive to da change.may have to go back to the prosystems hp1000 based carb Tex New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive

Re: Oil viscosity choice for strip and street [Re: tex013] #1338033 11/27/12 09:36 PM 11/27/12 09:36 PM
Joined: Nov 2003 Posts: 7,348 Mt.Vernon ,Ohio VernMotor master
VernMotor master Joined: Nov 2003 Posts: 7,348 Mt.Vernon ,Ohio	My car will be a little slow first pass. I do drive it around and warm it. but not allot. because the first 3 rounds of racing there will be down time. about a hour in between.. Till you get to later rounds .. so I want to know what my runs after it sets for a hour. I suppose you could drive it around before you go up for ever round but that would be a pain. I know if my car set for less then a 1/2 hour I need to take a little off the dial for that..so many things come in to play to dial the car..Now that I run e-85 the weather does not change it much. but still need to watch temp of car and track and wind LOL

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