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Old 09-26-2003, 09:43 PM   #1
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WHat's the best oil for drag racing?

I just broke in my 392 w frpp crate motor.
It has 20w50 in it(thats what was in it) And they say to use natural or synthetic 20w50 after the break in cycle. Do I really need that thick of oil? The car will be race only and trailered.
I want to use synthetic just because It's a personal preferance.
Any advice? Thanks


p.s. It ran 11.75 on drag radials! I'm pretty happy.
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Old 09-26-2003, 09:53 PM   #2
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My builder set mine up for Valvoline 20W-50 racing oil. I would use what ever your builder recomends.

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Old 09-26-2003, 10:18 PM   #3
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I've had excellent results with Royal Purple. I use the 20W-50 street blend, not the all out race belnd with oxygenators that are used up in 6 runs. I check the bearings at 150 passes and they looked like I just put them in. I could still see the bore guage marks from where I measured them. At 300 passes, it all comes apart for new aluminum rods, rings, etc. Bearings still look great at 300 runs.
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Old 09-27-2003, 03:31 PM   #4
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ttt
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Old 10-18-2003, 12:56 AM   #5
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I'd shy away from synthetics because there mainly designed to hold there viscosity at high tepature. Not that big of a problem for an engine that runs hard for a few minutes at a time. Synthetics also give up some of thier (slipperyness) in order to be more heat resistant. Thus the ban at break in. Anyways thatstheconcensous from the machinists I hang with. Hope it helps!
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Old 10-18-2003, 10:16 AM   #6
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I run regular 10w30 from walmart. Costs $1/litre. I change the oil after every race so its not a big deal. I run a 393W,I wouldnt worry so much about break in, my break in consistent of 20 minutes of idel to get up to temperature, a few burnouts behind the shop, drove it home, droped the oil. Drove it to the track the next day. Had no problems what so ever. Ran 9.82@140 2 weeks ago. Good Luck.
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Old 10-20-2003, 12:58 AM   #7
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WhiteStang, i just bought 5 quarts of Supertech 20w/50 at Walmart for $4.18. Do you really change it after every race? What oil pressure are you guys seeing? Mine is about 50 at idle, and about 70-75 WOT in 3rd. Is that too low for 7k?

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Old 10-20-2003, 03:27 AM   #8
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I was alway told that the rule of thumb about oil pressure is 10psi per 1000 rpm.
so going by that .....
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Old 10-20-2003, 04:10 AM   #9
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Fomoco347- 70-75 is prefect for 7000RPM.

What oil pan are you running?
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Old 10-20-2003, 05:22 PM   #10
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WhiteStang-----Canton 7 quart
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Old 10-20-2003, 08:02 PM   #11
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I set up my 347 with 22-thousandths clearance and it is running 80# at idle with 5-w30 Kendall GT-1 in it. I just swtiched it out to 5w-20 Ford Synthetic. I am running an HV pump with a Canton 7qt T-Pan using 6 qts. I am concerned with that high of a pressure, because with the thicker grades of oil, you are building heat. I don't like it that high to start with, in a light grade oil. Oil pressure is nothing more than hydraulic resistance. and with a thicker oil, you're building higher pressure more resistance and more heat with that resistance. I bet if you cut back in oil weight, you'll have comparable pressure with a cooler running temp.
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