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Open Track Racing
Suggestions on track day cooling/oil
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<blockquote data-quote="Jimmysidecarr" data-source="post: 12423257" data-attributes="member: 11681"><p>If you use a high quality high film strength oil, when the oil is as hot as it is likely to ever get, you technically only need between 6 to 8 psi of oil pressure per 1,000 rpm.</p><p></p><p>Test with very hot oil, this test is not helpfully with cold or normal temp oil.</p><p></p><p>Most guys will be able to get away with a one viscosity grade bump, which for most will be a 40 weight.</p><p></p><p>Instructors and advanced group guys are faster and will load more heat into the oil. Also guys running sessions longer than 1/2 hour are going to finding out if they are bumping into the limit of their system's ability to remove heat and if it is up to the task.</p><p></p><p>If you can get away with a lighter oil for the temps you run at run it do it.</p><p>A 30 weight is better able to remove heat from oil cooled components than a 40 weight and the same is true of a 40 weight over a 50 weight.</p><p></p><p>Overly thick oil and overly high oil pressure does not equal better protection.</p><p></p><p>The higher the rpm the less desirable a thicker oil becomes. Oil pumps release pressure at a certain point because at high rpm the rotation actually creates a hydrodynamic wedge that makes additional pressure unneeded and counter productive.</p><p></p><p>Get the oil really hot, then see what your oil psi is.</p><p>Then run as light an oil that will keep you within the guide, it will remove more heat.</p><p></p><p>Don't run a crap oil though, we are talking about race conditions that your engine is seeing.</p><p></p><p>Royal Purple HPS series oils will provide higher film strength than most of our competitors full race oils, yet they are priced very reasonably and very close to our API/SAE regular warranty compliant street oils.</p><p></p><p>Though comparable film strength will be very hard to come by, there are a lot of oils that will get the job done and be just fine.</p><p></p><p>Even with the API oils chemistry restrictions considered, even the mediocre oils made today and in the last 5 years are vastly superior to the crap we had to deal with back in the 60s,70s, 80s and even the 90s.</p></blockquote><p></p>
[QUOTE="Jimmysidecarr, post: 12423257, member: 11681"] If you use a high quality high film strength oil, when the oil is as hot as it is likely to ever get, you technically only need between 6 to 8 psi of oil pressure per 1,000 rpm. Test with very hot oil, this test is not helpfully with cold or normal temp oil. Most guys will be able to get away with a one viscosity grade bump, which for most will be a 40 weight. Instructors and advanced group guys are faster and will load more heat into the oil. Also guys running sessions longer than 1/2 hour are going to finding out if they are bumping into the limit of their system's ability to remove heat and if it is up to the task. If you can get away with a lighter oil for the temps you run at run it do it. A 30 weight is better able to remove heat from oil cooled components than a 40 weight and the same is true of a 40 weight over a 50 weight. Overly thick oil and overly high oil pressure does not equal better protection. The higher the rpm the less desirable a thicker oil becomes. Oil pumps release pressure at a certain point because at high rpm the rotation actually creates a hydrodynamic wedge that makes additional pressure unneeded and counter productive. Get the oil really hot, then see what your oil psi is. Then run as light an oil that will keep you within the guide, it will remove more heat. Don't run a crap oil though, we are talking about race conditions that your engine is seeing. Royal Purple HPS series oils will provide higher film strength than most of our competitors full race oils, yet they are priced very reasonably and very close to our API/SAE regular warranty compliant street oils. Though comparable film strength will be very hard to come by, there are a lot of oils that will get the job done and be just fine. Even with the API oils chemistry restrictions considered, even the mediocre oils made today and in the last 5 years are vastly superior to the crap we had to deal with back in the 60s,70s, 80s and even the 90s. [/QUOTE]
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