Oil viscosity choice for strip and street
#1337998
11/19/12 06:11 PM
11/19/12 06:11 PM
|
Joined: Mar 2009
Posts: 2,464 Sydney,Australia
tex013
OP
top fuel
|
OP
top fuel
Joined: Mar 2009
Posts: 2,464
Sydney,Australia
|
what oil viscosity is your choice and why i currently run Royal Purple HPR 20/50 in my 440.i do run a HV pump and deep sump.It runs at 35-40psi hot idle,70-75psi running. i am thinking of dropping to RP 10/40.my engine-dyno shop has recommended trying this as they have seen HP gains on their race car motor,nissan 240Z. weather here never sees much below maybe 7 degrees C in winter to just over 40 degree C in summer. thoughts ? things to watch out for ? or simply try it out on the dyno ? 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: BradH]
#1338000
11/19/12 08:27 PM
11/19/12 08:27 PM
|
Joined: Mar 2009
Posts: 2,464 Sydney,Australia
tex013
OP
top fuel
|
OP
top fuel
Joined: Mar 2009
Posts: 2,464
Sydney,Australia
|
thanks Brad, what i was thinking plus i like Reher's first rule - maybe stick to the 20/50
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]
#1338001
11/19/12 10:52 PM
11/19/12 10:52 PM
|
Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
|
master
Joined: Oct 2003
Posts: 7,506
Az
|
I run RP XPR 10W40 at the track. With the pressures you are presently running ( a little high IMO ) 10W40 will be a good step. I also run a flat tappet cam with no problems.
Fastest 300
|
|
|
Re: Oil viscosity choice for strip and street
[Re: BradH]
#1338002
11/19/12 10:59 PM
11/19/12 10:59 PM
|
Joined: Mar 2007
Posts: 1,608 Rudolph, Ohio
moparguy7074
top fuel
|
top fuel
Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
|
Quote:
IMO, for a flat-tappet cam, nothing thinner than the 10w40 you're proposing changing to.
So would 5W-30 RP be ok for a roller cammed engine?
|
|
|
Re: Oil viscosity choice for strip and street
[Re: topside]
#1338005
11/20/12 02:31 AM
11/20/12 02:31 AM
|
Joined: Jan 2003
Posts: 2,932 Finalnd, Perkele
jyrki
master
|
master
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
|
I like to keep the clearances on the tight side and use thin oil. Have used regular (Mobil) 5w40 synthetic for years in all engines I've built, including flat tappet.
Plynouth VIP '67 TT IC EFI
|
|
|
Re: Oil viscosity choice for strip and street
[Re: jyrki]
#1338006
11/20/12 06:42 AM
11/20/12 06:42 AM
|
Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
|
I use 20/W50 Valvoline racing oil. Ron
Last edited by 383man; 11/20/12 06:43 AM.
|
|
|
Re: Oil viscosity choice for strip and street
[Re: Crizila]
#1338009
11/20/12 12:23 PM
11/20/12 12:23 PM
|
Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
|
Mobil One 15w50 synthetic for me. Bearings look great at freshen ups so I'm sold on it.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
|
|
|
Re: Oil viscosity choice for strip and street
[Re: BradH]
#1338011
11/20/12 12:57 PM
11/20/12 12:57 PM
|
Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
|
I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
|
Quote:
Like was mentioned above, the "correct" oil viscosity is a factor of oil clearance, oil temps, application (short-duration vs. endurance), etc. Spending some time on the Joe Gibbs oil web site looking through their oil application guidelines may help improve understanding of this.
I also have some concerns about using oils that IMO are too thin for extended street use, especially when it comes to flat-tappet cams. I look at things like the HTHS (High Temp High Shear) ratings for different oils because that is a good indication of how the oil should handle heavy-interface loads such as cam & lifters.
You'll have trouble finding any Xw30 oil w/ a HTHS rating much higher than 3.5, whereas you can get as high as a 5.x HTHS rating w/ heavier oils. In that respect, oil viscosity can be (like so many other things) a compromise.
Damn Brad, you`ve got too much time on your hands. Some people love to over-complicate things and oil along w/all of the other subjects beaten to death is another one of them. I have to question how many actually try stuff instead of asking others who may not know what works and what doesn`t. I keep doing things that "experts" say can`t/shouldn`t be done again like the 8" vert on the street, spool thin oil etc. My clearances are bigger than most and even w/a high volume pump and only 6-quarts of oil, I still see 20-25 hot at idle and 65+ above 7000 rpm`s and never a problem EVEN street driving as in LOTS of desert miles and even dirt roads occationally.............just do it!
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
|
|
|
Re: Oil viscosity choice for strip and street
[Re: Thumperdart]
#1338012
11/20/12 01:09 PM
11/20/12 01:09 PM
|
Joined: Jan 2003
Posts: 8,027 Tulsa OK
Bad340fish
master
|
master
Joined: Jan 2003
Posts: 8,027
Tulsa OK
|
I run 6qts of 5W30 and one quart of Lucas oil stabilizer. It gives me the lower oil pressure I needed and the lucas oil additive keeps things nice and slimey or so it seems. Its a solid roller with about 2500 street miles on it now and 50-60 passes.
68 Barracuda Formula S 340
|
|
|
Re: Oil viscosity choice for strip and street
[Re: Thumperdart]
#1338013
11/20/12 01:11 PM
11/20/12 01:11 PM
|
Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
|
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
|
Quote:
... Some people love to over-complicate things...
Guilty as charged!
FWIW (serious note), if you're still running Mobil 1 10w30 as I recall from the past, I really don't believe what they sell now is a "beefy" enough oil for the power level you're making. I know you're all about bang for the buck and not over-spending (I try to be, but often fail miserably at it), but that stuff is about one step above horse p!ss now from all the info I can find on it.
I've stopped running it in my '02 WRX, if that's any indication of my loss in confidence w/ Mobil 1's street oils.
|
|
|
Re: Oil viscosity choice for strip and street
[Re: Thumperdart]
#1338015
11/20/12 02:00 PM
11/20/12 02:00 PM
|
Joined: Jan 2003
Posts: 2,932 Finalnd, Perkele
jyrki
master
|
master
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
|
We have run 5W40 mobil 1, but only make 1580+ hp..., same oil in our 970 hp + nitrous B1 and after one season it was spotless. Didn't even bother to open the other one since we checked it in 2010. It propably isn't the oil with all the best properties, but it's good enough for us and you can buy it here anywhere.
Plynouth VIP '67 TT IC EFI
|
|
|
|
|