New 98" build started
Thread Starter
|
Outstanding HDF Member
Joined: May 2009
Posts: 2,160
Likes: 62
From: GA.
Yes, stock 88" motor other than the cams. I did have a slight exhaust leak on the front cylinder, so I wonder if that may be the cause of clean spot on the piston?
That actually crossed my mind the other day, but I'll be damned if I can feel it. I even held a lit cigarette around both heads at the exhaust flange looking for the smoke to puff. It has a similar sound, but it doesn't seem to be coming from the exhaust.
I'm gonna change the oil today, and run some Mobil one 15/50 in it, and see if there's any change in sound.
Here's a short film clip from last night. I never got it up to fully hot, as I didn't want to just sit there letting it run, and didn't feel like riding it. There's several different short clips together, at different levels of engine temp. You can definitely tell the difference in sound from the beginning after first starting it, to the end when it has gained some temp. It never got hot enough though to get as loud as what I'm referring to. I'll shoot another clip after changing the oil and going for a spin, to compare.
http://www.youtube.com/watch?v=oW_E-56lVFU
I'm gonna change the oil today, and run some Mobil one 15/50 in it, and see if there's any change in sound.
Here's a short film clip from last night. I never got it up to fully hot, as I didn't want to just sit there letting it run, and didn't feel like riding it. There's several different short clips together, at different levels of engine temp. You can definitely tell the difference in sound from the beginning after first starting it, to the end when it has gained some temp. It never got hot enough though to get as loud as what I'm referring to. I'll shoot another clip after changing the oil and going for a spin, to compare.
http://www.youtube.com/watch?v=oW_E-56lVFU
Road Warrior
Joined: Mar 2008
Posts: 1,783
Likes: 10
From: Oh
On my latest build the vlv seats were radius-ed to improve flow. The added benefit to this is less carbon buildup. The added compression (10.5:1) with a cam overlap for opening /closing of the vlv's also helps with fill and speeds exit gases from the combustion chamber quicker. So changing the vlv angle is just part of the solution for decreasing carbon buildup. Of course, twisting the throttle also helps to blow out excessive buildup.
Ultimate HDF Member
Joined: Nov 2008
Posts: 6,682
Likes: 12
It's hard to say from the video but it sounds like it's coming from the front cylinder...if there is a problem. It almost sounds like it's just that high lift cam doing it's thing. That's what I would say it is except you said it runs doggy. That being said, I see you are in Georgia and I'm guessing it's pretty toasty down there. We've had heat indexes around 105 here in Oklahoma. The oil change may quiet the noise down if it's really hot or if the oil is getting old and breaking down but obviously that doesn't explain it not running hard.
Last edited by 1931jamesw; Jun 26, 2010 at 08:54 AM.
Thread Starter
|
Outstanding HDF Member
Joined: May 2009
Posts: 2,160
Likes: 62
From: GA.
The cam is only .510 lift.....
Been in the high 90's here lately, and it's miserable with the humidity. As I said before, it's much louder when the bike heats up. I could live with it if it stayed like the video. Gonna change the oil shortly and see what happens.
Been in the high 90's here lately, and it's miserable with the humidity. As I said before, it's much louder when the bike heats up. I could live with it if it stayed like the video. Gonna change the oil shortly and see what happens.
Ultimate HDF Member
Joined: Nov 2008
Posts: 6,682
Likes: 12
I was just looking at the cam specs and realized that. As you said, try the oil change and see where you're at and it that doesn't fix it, maybe adjust the pushrods again back to 2 and 1/2 turns out and try again. Are you running stock lifters and how many miles are on them?
Thread Starter
|
Outstanding HDF Member
Joined: May 2009
Posts: 2,160
Likes: 62
From: GA.
Got the oil changed and went for a quick spin. The noise is still there, but maybe not quite as loud as before. I didn't ride real far though, and didn't ride hard. It definitely seems to be the front cylinder. The rear cylinder has the typical "clacking" sound, while the front is more of a "tink" sound. Weird, but I'm not gonna sweat it anymore right now. The bike actually seems to be running a bit better than the other day, but nowhere near as well as I hoped. I hope the tune makes up for it, cause right now I'm not seeing enough of a difference to justify the money I just spent. I have a feeling I'm gonna end up having to change cams again wake this thing up.
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