Go Back   Harley Davidson Forums > General Harley Davidson Forums > General Harley Davidson Chat
Sign in using an external account
Register Forgot Password?
Search

General Harley Davidson Chat Forum to discuss general Harley Davidson issues, topics, and experiences.
Sponsored by: J&P Cycles

Reply
 
 
 
P
 
Thread Tools Search this Thread
  #11  
Old 11-19-2010, 05:10 AM
Tactical111's Avatar
Tactical111 Tactical111 is offline
Road Master
Join Date: Aug 2010
Location: SE Michigan
Posts: 1,034
Default

One factor for a different sounding engine is the bore to stroke ratio. To get the bigger displacements HD increased the bore primarily. It was the long stroke that gives the old Shovels and Evos that "potato" sound. Also read recently in a "Hot Baggers" Mag article that any idle below 1000 rpm delivers a shock to the crank shaft as the slow turning engine tries to cycle and can damage the lower end. If I can find the exact quote/article I'll pass it on. Oh, another big factor I think is the stock exhaust on the newer Harley's. I had one pull up next to me at a red light a few years ago and I swear it sounded like a Honda; it was a sporty if I recall.
__________________
" Give me control of a country's currency and I care not who makes the laws." Rothschild

"As long as you say I'm free then keep these chains on me. Tell me down is up; I'll let you fill this broken cup. Just promise me fame and I'll survive on this bread of shame." ( Creed; "Bread of Shame)
Reply With Quote
  #12  
Old 11-19-2010, 05:53 AM
dog155's Avatar
dog155 dog155 is offline
Extreme HDF Member
Join Date: Nov 2006
Location: Windham,Maine
Posts: 12,831
Default

Much higher idle speed and EFI!!!
__________________
2006 RK 155" R&R TwinCam
2000 Boss Hoss 427" SBC
Reply With Quote
  #13  
Old 11-19-2010, 06:12 AM
AFHarley's Avatar
AFHarley AFHarley is offline
Prospect
Join Date: Oct 2010
Location: Panama City Beach
Posts: 163
Default

Doesn't really matter to me... Still sounds better than those rice burner bikes IMO!
__________________

2010 Super Glide Custom - Flame Blue Pearl/Brilliant Silver Pearl

Reply With Quote
  #14  
Old 11-19-2010, 06:25 AM
brenn's Avatar
brenn brenn is offline
Elite HDF Member
Join Date: Aug 2008
Location: Kentucky
Posts: 4,845
Default

My 04 Softail has a carb and Samson Big Guns. It REALLY sounds like a Harley. In fact, I may get baffles to quiet it for riding to work. However, even the most stock-exahaust, EFI new from the showroom Harley still sounds enough like a Harley to be distinguishable from everything else by sound alone, as soon as you hear it. Honda and Yamaha and Victory may make bikes that look like a Harley from a distance, but you can tell them apart by sound before you can do it by looks.
__________________
2004 FXST

They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety. Benjamin Franklin - 1775.

If you are dressing for the crash, instead of for the ride, you should wear a Prius.
Reply With Quote
  #15  
Old 11-19-2010, 06:37 AM
reddog8145's Avatar
reddog8145 reddog8145 is offline
Road Captain
Join Date: May 2009
Location: Mancheser UK
Posts: 596
Default

It would appear that the loss of the potato is down to the 96 engine having an oil pump that requires higher rev's to make sure that the oil gets to where its needed. I must admit I miss the potato sound, the new bikes sound quite modern on tick over. Even changing pipes has little effect.
However we do need to move with the times, or buy an older bike.
__________________


2012 Road King Classic
Reply With Quote
  #16  
Old 11-19-2010, 06:42 AM
MNPGRider's Avatar
MNPGRider MNPGRider is offline
Ultimate HDF Member
Join Date: Jul 2007
Location: SW Minnesota
Posts: 5,373
Default

I don't think anyone yet has the correct answer. Po-ta-to Po-ta-to is a three beat sound coming out of a two cylinder engine. Modern Harleys only have a tater tater sound.

The Potato Potato sound was produced by the old ignition, which fired both spark plugs at the same time, producing a "wasted" spark on each cylinder's exhaust stroke. Because there is a 405 degree difference in the stroke from the rear cylinder to the front on each revolution, when the rear cylinder fires on its compression stroke, the front exhaust valve is still open, unburned gases are ignited in the front exhaust by the "wasted" spark, causing the first beat of the potato sound. The modern ignition fires each plug separately at the proper time.

Add in the richer fuel mixture from a carb which loaded up the exhaust with unburned gases, and a slow idle, and that's why the old bikes had the classic sound we all loved.

Japanese bikes say "rice-a-ro-ni".
__________________
'06 Ultra TC88 (built 5/06) Black Pearl, SE K&N with Boyeson X-Wing, Andrews 21G cams, Cobra PowrPro Tuner, 74.77 HP, 78.67 Tq. Modified stock pipes, EZ Brake Rear pedal, Ride On in the tires
'75 Trident T150, '76 Trident T160 (see My Garage for pics!)
PGR #26,555, Iron Butt Association # 34783 SaddleSore 1000 8/09/08
Mn MSF Instructer of the year, 1999
Officially retired as of 10/10/2014

Last edited by MNPGRider; 11-21-2010 at 05:09 PM..
Reply With Quote
  #17  
Old 11-19-2010, 06:46 AM
sageone sageone is offline
New Member
Join Date: Oct 2010
Posts: 91
Default

Wouldn't revert to old technology just for the sound alone. Would need a better reason.
Reply With Quote
  #18  
Old 11-19-2010, 07:22 AM
Jonesee Jonesee is offline
Road Warrior
Join Date: Sep 2006
Location: Florida
Posts: 1,882
Default

Quote:
Originally Posted by sageone View Post
Wouldn't revert to old technology just for the sound alone. Would need a better reason.

I wouldn't buy a new bike for technology alone. Different strokes for different folks. I will stick with my carbed bike.
__________________
Sit, Twist, Refuel, Repeat
IBA # 48383
1,528 miles / 20hrs 57mins (certification pending)
1,143 miles / 17hrs 53mins
1,783 miles / 34hrs 17mins
1,035 miles / 15hrs 15mins Shoalmire 1000 mile
and some others...
Reply With Quote
  #19  
Old 11-19-2010, 07:49 AM
sageone sageone is offline
New Member
Join Date: Oct 2010
Posts: 91
Default

This is true, much easier to work on that's for sure.
__________________

2010 Electra-Glide Ultra Limited
FM 2/1/2 Headpipe, Jackpot 4" Dyno-tuned mufflers, PCV, SE A/C, Zumo 660 w/handlebar mount, Navi Interface module, Premium Tourpak Hinges, Siren II and Pager, misc chrome upgrades.
Reply With Quote
  #20  
Old 11-19-2010, 07:59 AM
DCLXVI DCLXVI is offline
Road Warrior
Join Date: Aug 2009
Location: Central FL
Posts: 1,490
Default

Between the EFI, emissions and newer style ignition the sound has been changed. The new sound is simply " tater, tater, tater, tater.
Reply With Quote
Old 11-19-2010, 07:59 AM
 
 
 
P
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Potato..potato...question TracerBullet General Harley Davidson Chat 103 07-31-2014 10:49 PM
How to get the potato/potato sound Flhrhog Exhaust System Topics 13 05-15-2014 04:38 AM
Heritage owners with stage 1: What exchaust's do you have Pete6114 Softail Models 31 03-26-2012 09:10 AM
Need Advice for stage 1 upgrade ... dantoniov Softail Models 20 01-29-2009 09:46 PM
Night Rod special touring ? no more bob CooliosBandit VRSC Models 13 07-21-2007 12:29 AM


Tags
bad, big, cam, davidson, fire, fuel, harley, ignition, injected, lope, noise, potato, potatto, pottato, single, sound, sounds


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join HDForums

Advertising
Featured Sponsors
Vendor Directory
Sponsors

All times are GMT -5. The time now is 03:08 PM.


Internet Brands, Inc.