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Switching to SAE 50 Which brand?
There are to many straight 50 weight oils out there. What do you use and why?
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Be sure to add a can or two of STP. If it pours, it's too thin.
Bob |
Why??
Why on earth would you be looking to use 50wt in the car? :confused:
Is the motor so worn out that it can't hold pressure with 10wt? Or put together with clearances so big that it can't hold pressure? Is it a blower motor, intentionally put together with lots of clearance? :confused::confused: Apart from reasons like these, there's just no way you should be looking to run such a heavy oil. |
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Call Eric at PE who built your engine for his advice. Don't think he'd approve. I doubt that you're endurance racing or at the 3HP/cubic inch level. If you persist with this bad idea, you'd better have a HD oil pump drive shaft. |
Pick any racing oil---Valvoline, Penz, Quaker, etc---from an oil company vs the oils from gasoline companies like Shell, Amoco,etc
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Take a look at Schaeffer synthetic
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I have an engine built by Eric at PE. He recommended joe gibbs XP4. I have since gone to royal purple. If you want I have 16 quarts of the XP4 i'll sell you for $90. One case is $90. What a bargain. :LOL:
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Eric recommended 20w-50. That answers that. If it aint broke, dont fix it:3DSMILE:
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Let me know if you want that XP4. I see you have a 460, I have a 427W so Eric may want something different in that application. Good luck. I tried to do some research on oil. There is a ton of info on this site. I'm running an oil cooler as well and had a problem of getting the oil up to temp, so I just installed a canton oil thermostat. Did the trick.
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Did you ask him what bearing clearances he used to warrant that? Maybe "it ain't broke" - yet. |
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Since your in NY, a 5w30 would be fine. That 50 will be playing hell on your oil pump. I'm suprised it was recommended. Two things about oil, film strength (which has nothing to do with weight), and cooling (which that gravy chugging through the system won't do very well). Try running 100% coolant to see how that works. Keep in mind your oil clearance is 2~3 thousands of an inch, when you see your oil pressure skyrocket that means it's having a tough time going where it needs to go and your oil pump has to try to force more oil into this high pressure chamber. The end result is snapped distributor pins, ground off gears, and sheared pump drive shafts. (also lots of towing bills) |
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cold engine: pressure @ idle: 82 psi hot engine: idle (800 rpm) .... 35 psi 1500 rpm ..............70 psi 2000 rpm ..............72 psi 2500 rpm ..............75 psi 3000 rpm ............. 80 psi 3500 rpm ............. 82 psi 4000 rpm ............ 85 psi 5000 rpm ............ 85 psi 6000 rpm ............ 85 psi 6500 rpm ............ 85 psi I know Texas & New York have little in common weather-wise, but If the use of your engine is moderate to severe, then heavy oil might be indicated if you're not concerned with some horsepower loss. Z. Ray |
Gee Fellas, I've been running all kinds of HP motors for many years in cool to hot climent and haven't had one problem with oil messing up the engine. My problem is my heavy right foot and lack of judgement when to back off the gas pedal.
20-50 Valvolene Racing Oil and a can of STP......works great! Bill |
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At 2500 RPM cold im at 70psi at 2500 RPM 100c im at 57psi With 20w50 |
This is one of those subjects that makes the popcorn concession rich ... however , here`s my $.02 worth . Some years ago , Smokey Yunick used the rule of thumb that you needed 10 psi of oil pressure for each 1,000 rpm at operating temperature . Any more and it was a heat generator and absorbed hp ( that old pesky pressure drop across an orifice ... there are formulas to calculate the heat generated if interested ??? ) I checked with a friend of mine who used to be a NASCAR engine builder and that is still a valid rule . However , keep in mind that the NASCAR boys are after every single pony they can find .
Will "too much " oil pressure cause a problem ?? Probably not , as there are many engines out there running well with far more than the "optimal" oil pressure . BTW , my engine maxes out at about 65 to 70 psi at 6200 rpm at 180 degrees oil temp .... 10w40 0il . Listen to what your engine builder says as it is/was his engine and he has the experience . Just my opinion . Bob |
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BaaaaaaaaaHaaaaaaaaaaa!!!!!!!!!!!!:LOL: :LOL: :LOL: |
What is your pressure at idle cold?
What is your pressure at idle hot ? What is your pressure at 2500rpm cold ? What is your pressure at 2500 hot? These are key questions to answer bebore you choose your oil. |
We run 50wt Royal purpal never had a problem with it or breaking anything,But we do a long warmup before an event,if driving on the street its take it easy till the engine gets up to operating temp.:3DSMILE:
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