Potato..potato...question
Seasoned HDF Member
Joined: Nov 2009
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From: Farmington ,MS
Pretty simple to get the sound you are after out of an EVO...either convert it to points, or disconnect the VOES at idle...some company used to sell a kit for EVOs that had a switch that mounted on the carb, that disconnected the voes at idle and it was normal off-idle...couldn't be too hard to replicate.
Last edited by Tom84FXST; Jul 29, 2014 at 05:53 AM.
Seasoned HDF Member
Joined: Jul 2007
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From: SW Minnesota
The first beat of the po-ta-to po-ta-to sound sound was created by unburned fuel firing in the exhaust stroke of the front piston by the wasted spark of the old dual fire ignition, when both plugs sparked at the same time. With all Harleys now using a single fire ignition, all we get is a ta-to ta-to sound.
Further compounding the loss of that beautiful sound is more controlled fuel delivery due to fuel injection, but the main reason is the change in ignition. Supposedly, you can run a jumper across your two coils so they fire together and duplicate to some extent the old sound. The Niterider site has a page on that.
Here's good article on what happens with a dual fire ignition on a Harley engine.
http://www.nrhsperformance.com/tech_singlefire.shtml
Further compounding the loss of that beautiful sound is more controlled fuel delivery due to fuel injection, but the main reason is the change in ignition. Supposedly, you can run a jumper across your two coils so they fire together and duplicate to some extent the old sound. The Niterider site has a page on that.
Here's good article on what happens with a dual fire ignition on a Harley engine.
http://www.nrhsperformance.com/tech_singlefire.shtml
Last edited by MNPGRider; Jul 29, 2014 at 11:49 AM.
Outstanding HDF Member
Joined: Jul 2013
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From: Houston, TX
Again, has nothing to do with oil pressure or flow. As long as the oil pump on a pan/shovel/evo is primed, it doesn't need that much pressure to operate. It is not really an oil "pump" system but an oil "flow" system.
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From: NE Philly
Cruiser
Joined: Jun 2014
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From: Cincy
Nope. An unbalanced motor with both rods inline on the crank will beat itself to death unless the idle is set at a certain RPM. If you want to run your idle that low and destroy your bottom end that's fine with me... I hope you do more riding than idling.
Again, has nothing to do with oil pressure or flow. As long as the oil pump on a pan/shovel/evo is primed, it doesn't need that much pressure to operate. It is not really an oil "pump" system but an oil "flow" system.
Again, has nothing to do with oil pressure or flow. As long as the oil pump on a pan/shovel/evo is primed, it doesn't need that much pressure to operate. It is not really an oil "pump" system but an oil "flow" system.
Why can other manufacturers and earlier eras of HD's pull it off? They were/are inline, shared pin, V twins as well.
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Outstanding HDF Member
Joined: Jul 2013
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From: Houston, TX
None of them can "pull it off". It's harmful to the lower end on all HD's. Does it mean you'll necessarily have problems? Maybe not... but it still isn't good for your motor and you will take life off of the bottom end.
Cruiser
Joined: Jun 2014
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From: Cincy
The new Indians idle warm, stock, at 750RPM.