confounded : one moment running good, next NOT
Elite HDF Member
Joined: Apr 2012
Posts: 3,986
Likes: 709
From: San Diego
He's in Singapore which means he is likely talking about 95 and 98 RON. 95 RON = 91 Octane here and 98 RON = 93 Octane here.
Last edited by 24v; Dec 6, 2017 at 07:31 AM.
Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
Likes: 2,299
From: NW Ohio
Outstanding HDF Member
Joined: Mar 2015
Posts: 2,840
Likes: 900
From: Philly Suburbs
I would definitely start with an immediate oil change. As previously noted, the way you were running when this happened may have overheated the oil, causing a loss of viscosity. Chris is right on the money about octane... You only need a higher rating if you're running so much advance (or compression) that you're getting some detonation...
Advanced
Joined: May 2012
Posts: 52
Likes: 0
From: austin
Hmmm...
I've been scratching my head pondering whether to reply. A few thoughts...
Oil doesn't impact engine performance unless you don't have sufficient. Yeah the dyno freaks like thin stuff for high numbers but generally speaking you'll see NO significant difference in engine performance.
If you moved from Syn 3 (20w-50 I recall) to a straight 50w oil there is almost no difference anyway once at operating temperature. The cold properties are different but once hot they are almost the same viscosity. The warm up on straight 50w risks damage to your motor if the temp get too low.
If you really did get any improvement from thicker oil the only impact it could have is the lifters. If you had a failing lifter that may have improved short term from the thicker oil.
Then with the "silly little revving party parade" the lifter probably gave up. Of course you you could have bounced a valve off a piston and bent it a bit causing compression loss if you over revved the motor.
I'd run a compression test (aka cylinder pressure test). Do post the results.
That's my guess and worth everything you paid for it. YMMV.
Oil doesn't impact engine performance unless you don't have sufficient. Yeah the dyno freaks like thin stuff for high numbers but generally speaking you'll see NO significant difference in engine performance.
If you moved from Syn 3 (20w-50 I recall) to a straight 50w oil there is almost no difference anyway once at operating temperature. The cold properties are different but once hot they are almost the same viscosity. The warm up on straight 50w risks damage to your motor if the temp get too low.
If you really did get any improvement from thicker oil the only impact it could have is the lifters. If you had a failing lifter that may have improved short term from the thicker oil.
Then with the "silly little revving party parade" the lifter probably gave up. Of course you you could have bounced a valve off a piston and bent it a bit causing compression loss if you over revved the motor.
I'd run a compression test (aka cylinder pressure test). Do post the results.
That's my guess and worth everything you paid for it. YMMV.
Last edited by neilpp; Dec 6, 2017 at 02:20 PM.
Outstanding HDF Member
Joined: Mar 2015
Posts: 2,840
Likes: 900
From: Philly Suburbs
I've been scratching my head pondering whether to reply. A few thoughts...
Oil doesn't impact engine performance unless you don't have sufficient. Yeah the dyno freaks like thin stuff for high numbers but generally speaking you'll see NO significant difference in engine performance.
If you moved from Syn 3 (20w-50 I recall) to a straight 50w oil there is almost no difference anyway once at operating temperature. The cold properties are different but once hot they are almost the same viscosity. The warm up on straight 50w risks damage to your motor if the temp get too low.
If you really did get any improvement from thicker oil the only impact it could have is the lifters. If you had a failing lifter that may have improved short term from the thicker oil.
Then with the "silly little revving party parade" the lifter probably gave up. Of course you you could have bounced a valve off a piston and bent it a bit causing compression loss if you over revved the motor.
I'd run a compression test (aka cylinder pressure test). Do post the results.
That's my guess and worth everything you paid for it. YMMV.
Oil doesn't impact engine performance unless you don't have sufficient. Yeah the dyno freaks like thin stuff for high numbers but generally speaking you'll see NO significant difference in engine performance.
If you moved from Syn 3 (20w-50 I recall) to a straight 50w oil there is almost no difference anyway once at operating temperature. The cold properties are different but once hot they are almost the same viscosity. The warm up on straight 50w risks damage to your motor if the temp get too low.
If you really did get any improvement from thicker oil the only impact it could have is the lifters. If you had a failing lifter that may have improved short term from the thicker oil.
Then with the "silly little revving party parade" the lifter probably gave up. Of course you you could have bounced a valve off a piston and bent it a bit causing compression loss if you over revved the motor.
I'd run a compression test (aka cylinder pressure test). Do post the results.
That's my guess and worth everything you paid for it. YMMV.
Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
Likes: 2,299
From: NW Ohio
Can the new(er) ECUs adapt/learn the timing curve based on knock history? If so, a reset may be beneficial.
(yet another reason I HATE stock ECUs. If I have to have a computer controlling my engines, I prefer one I can plug my PC into to diagnose/adjust.)
(yet another reason I HATE stock ECUs. If I have to have a computer controlling my engines, I prefer one I can plug my PC into to diagnose/adjust.)
Last edited by cggorman; Dec 6, 2017 at 02:35 PM.
Thread Starter
|
Road Captain
Joined: Dec 2010
Posts: 621
Likes: 19
From: Glendora, Southern Calif
thanks guys
I have a service due in 2 weeks.
I'll be sure to get a compression reading and update on this thread
I have a service due in 2 weeks.
I'll be sure to get a compression reading and update on this thread
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Thread Starter
|
Road Captain
Joined: Dec 2010
Posts: 621
Likes: 19
From: Glendora, Southern Calif
weird discovery
i remapped my tune (using the current tune) (wanting to just narrow in for my peace of mind)
the bike runs amazing, no sluggish feel
just perfect
i'll still be posting my compression so keep watching this space
i remapped my tune (using the current tune) (wanting to just narrow in for my peace of mind)
the bike runs amazing, no sluggish feel
just perfect
i'll still be posting my compression so keep watching this space