Noisy drivetrain ??
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Road Master
Joined: Aug 2010
Posts: 770
Likes: 3
From: Wabash
Noisy drivetrain ??
I've had lots of work done to my scoot...professionally by HD and Valley Racing.
108CI SCREAMING EAGLE BIG BORE KIT. HEAVY BREATHER. HILLSIDE CYCLE STAGE III HEADS 1.94 INTAKE VALVE 1.61 EXHAUST
WOODS TW 8.6 CAMS .590 LIFT/246 DURATION
BARNETT CLUTCHES AND SPRINGS S AND S PUSHRODS/ADJUSTABLE
HACKER WARHEADER 2 into 1 EXHAUST
POWER COMMANDER FIVE -TUNED BY VALLEY RACING
All top notch parts and all done to spec. I do notice the power to be sure but I also notice an increase in drive trin noise (at least that's what my dealers head mechanic says it is). So my question to those of you who have heavily modified your engines internals...cams, lifters valves etc....did you notice a noisier valve train? I notice mine making a vibrating chirping sound at the top of the rom curve just at the point where you shift from first into second and 2nd into third. It's not causing any mechanical issues its just weird and. I'll annoying. If its tag huge dams and other mods then hearing that from others would calm my nerves a lot.
Anyone else???
108CI SCREAMING EAGLE BIG BORE KIT. HEAVY BREATHER. HILLSIDE CYCLE STAGE III HEADS 1.94 INTAKE VALVE 1.61 EXHAUST
WOODS TW 8.6 CAMS .590 LIFT/246 DURATION
BARNETT CLUTCHES AND SPRINGS S AND S PUSHRODS/ADJUSTABLE
HACKER WARHEADER 2 into 1 EXHAUST
POWER COMMANDER FIVE -TUNED BY VALLEY RACING
All top notch parts and all done to spec. I do notice the power to be sure but I also notice an increase in drive trin noise (at least that's what my dealers head mechanic says it is). So my question to those of you who have heavily modified your engines internals...cams, lifters valves etc....did you notice a noisier valve train? I notice mine making a vibrating chirping sound at the top of the rom curve just at the point where you shift from first into second and 2nd into third. It's not causing any mechanical issues its just weird and. I'll annoying. If its tag huge dams and other mods then hearing that from others would calm my nerves a lot.
Anyone else???
Cruiser
Joined: May 2012
Posts: 203
Likes: 7
From: Arizona
me too man, I have come to terms with it. I noticed it a lot once I put in H54 cams and even more with head work/ 107 kit. I guess it's a price you gotta pay to get performance. If you think about it, you have higher lift cams and much stronger springs...your valve will open further, and slap closed faster, more noise is inevitable.
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Road Master
Joined: Aug 2010
Posts: 770
Likes: 3
From: Wabash
I guess so....somewhere in my Brain tho I equated high performance mods to not hearing the kind of things we hear. My wife's mustang is pretty high performance and its not noisier. Just figured after all the money I vested, the bike would sound better. But maybe it is the nature of the vtwin beasts we ride. I can live with the noise...I got huge power....just worried the noise is a problem. Don't want the ****ing thing to implode going down the road either ya know?
Stellar HDF Member
Joined: Aug 2012
Posts: 2,664
Likes: 184
From: Indiana, USA
Yes but, I always assumed the sound was valves closing and cylinders whiring at high RPM. (High lift cam, high compression pistons, Max RPM Extended) The noise I had was a high pitch tinny sound similar to a tool being drug down the aluminum fins of a jug, always just before shifting. Bothered me at first but I rode it awhile and the new noise become the norm. As long as my adjustable pushrods were set properly and everything was torqued to spec I never worried about it and it never flew apart.
Thread Starter
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Road Master
Joined: Aug 2010
Posts: 770
Likes: 3
From: Wabash
Yes but, I always assumed the sound was valves closing and cylinders whiring at high RPM. (High lift cam, high compression pistons, Max RPM Extended) The noise I had was a high pitch tinny sound similar to a tool being drug down the aluminum fins of a jug, always just before shifting. Bothered me at first but I rode it awhile and the new noise become the norm. As long as my adjustable pushrods were set properly and everything was torqued to spec I never worried about it and it never flew apart.
So based on that and your so very accurate description I'd have to side on the observation that its normal. I think.
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Thread Starter
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Road Master
Joined: Aug 2010
Posts: 770
Likes: 3
From: Wabash
Yes but, I always assumed the sound was valves closing and cylinders whiring at high RPM. (High lift cam, high compression pistons, Max RPM Extended) The noise I had was a high pitch tinny sound similar to a tool being drug down the aluminum fins of a jug, always just before shifting. Bothered me at first but I rode it awhile and the new noise become the norm. As long as my adjustable pushrods were set properly and everything was torqued to spec I never worried about it and it never flew apart.
Stellar HDF Member
Joined: Aug 2012
Posts: 2,664
Likes: 184
From: Indiana, USA
The first time I heard this I assumed the valves were slightly touching the top of the piston at WOT just before shift. I have had 2 bikes make this sound, 1 a carburated Evo and the other a Fuel Injected Twin Cam. Both were eventually torn down for 1 reason or another and neither showed any unusual wear in the valve train , evidence of early detonation/pre-ignition ping, nor had any marks on the piston which would suggest insuffecient valve to piston clearance. I had the the Evo for almost 20 years and put over 30k mi with that build, tore it down to replace a weeping base gasket. I still have the Twin Cam which was tore back down to replace soft rings that never sealed up. I assume the builder of this engine had researched lift and ratio of the valve train and checked piston to valve clearance with putty during the build.