Lifters
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Last edited by R&S CNC/Head Hoggers--; Sep 24, 2025 at 09:30 AM.
Do you have documentation that supports this theory? It is a fact ,that full synthetic oils are more heat stable than conventional oils.
https://autooilandfluid.com/the-real...ventional-oil/
https://autooilandfluid.com/the-real...ventional-oil/
All I know is our testing doing back to back tests the quality Dino oil works better. Use what you like, but we never have heat related failures in our builds and we run pretty aggressive combos in our faster street stuff.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,928
Likes: 8,030
From: poway
I've synth in some pretty aggressive street motors and have not seen any heat related failures due to heat. What failures are you seeing?
Heck I own a Onan NHD6300 gen set that got so hot it blew both headgaskets due to Santa Ana winds pushing the air cooling back into the motor. No other issues. I've seen RPMs go up, oil usage go down when going to Synth.. I do know of a guy that oil usage go down a 60s muscle car when changing back to Dino tho.
I'm not sure how you can say head temps differ between oils. Not much oil makes it to the top end. What kind of temp difference were you seeing?
I've synth in some pretty aggressive street motors and have not seen any heat related failures due to heat. What failures are you seeing?
Heck I own a Onan NHD6300 gen set that got so hot it blew both headgaskets due to Santa Ana winds pushing the air cooling back into the motor. No other issues. I've seen RPMs go up, oil usage go down when going to Synth.. I do know of a guy that oil usage go down a 60s muscle car when changing back to Dino tho.
I'm not sure how you can say head temps differ between oils. Not much oil makes it to the top end. What kind of temp difference were you seeing?
Heck I own a Onan NHD6300 gen set that got so hot it blew both headgaskets due to Santa Ana winds pushing the air cooling back into the motor. No other issues. I've seen RPMs go up, oil usage go down when going to Synth.. I do know of a guy that oil usage go down a 60s muscle car when changing back to Dino tho.
I'm not sure how you can say head temps differ between oils. Not much oil makes it to the top end. What kind of temp difference were you seeing?
Club Member
Joined: Mar 2009
Posts: 66,126
Likes: 51,454
From: Niles Canyon Ca.
Evo lifter problems existed before syn was a thing on Harleys, the factory redesigned the lifter in the mid `90s, and since then the OEM Evo lifters have been good.
More failures every generation, but Shovels weren`t putting out the crazy horsepower numbers that the TC`s and M8`s are seeing.
The late model lifter failures may be rare, but common enough that I get rid of OEM lifters as soon as a machine is out of warranty.
I disagree with the idea that lifter roller failures (or any other component for that matter) are the result of synthetic oil.
Quality US made lifters are not failing, it`s the imported junk lifters (OEM TC-M8) that are failing.
More failures every generation, but Shovels weren`t putting out the crazy horsepower numbers that the TC`s and M8`s are seeing.
The late model lifter failures may be rare, but common enough that I get rid of OEM lifters as soon as a machine is out of warranty.
I disagree with the idea that lifter roller failures (or any other component for that matter) are the result of synthetic oil.
Quality US made lifters are not failing, it`s the imported junk lifters (OEM TC-M8) that are failing.
The horsepower has negligible impact where the metal meets the metal on cams and lifters, cam lobe design, lifter to pushrod angle ratios, spring tension and seat pressures dictate that, size and go boom is all on the crank components and the lower end bearings.
Debate between import verses on shore products still comes back to source materials, machinery and processes used in the manufacturing. US company using less expensive imported materials and machinery are going have the same problems. Every company is shaving a dime where they can, engineering specs on the paperwork look great and it's been proven in every industry out there the product usually don't live up to them in the long run. We both have long experience in critical industries, you've maybe seen less of it but it is a fact of life.
Last edited by TwiZted Biker; Sep 24, 2025 at 01:16 PM.
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