potato-potato idle

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Jan 15, 2023 | 04:58 PM

#41

dfixit1

Tourer

Joined: Aug 2021

Posts: 449

Likes: 197

From: NC Mountains

Quote:

Originally Posted by sportyrider1

Twin Cam potato-potato =Baked potatoTwin cam[sm=forgetit.gif]not enough oil flow at that low rpm

.

I know this is an old thread, just couldn't help-myself. 3 things to to consider, 1. Change that cam support plate and oil pump to something like I did, Fueling HiFlow plate and pump. That eliminates the "low flow" at lower idle. 2. Add a Thunder Max tuner., check your current voltage out put at the battery at idle, then dial down the idle rpms until the voltage starts to drop so you won't kill the battery charge while stuck in "traffic" etc. 3. Add a nice set of cams. I went with the highest lift/best cam that would bolt into my rig without going through the top side to get to them.
My cardiologist says if I could get my heart rate down to match the lope dialed into my bike, I might live long enough to wear those parts out and start over.

Jan 15, 2023 | 05:10 PM

#42

dfixit1

Tourer

Joined: Aug 2021

Posts: 449

Likes: 197

From: NC Mountains

Quote:

Originally Posted by amstaffs

I had Red Shift cams installed last week and they sound pretty good. 107.8HP and 106.1 TQ Still not an evo

I finished up my mods a few months back, a part of that was Red Shift 511's. That was the largest lift etc. I could go with without reworking the top side too. They show-do sound good and compared to H/D stock have enough torque to pull that greasy string outta the cats hind-end,, so to speak. I'm happy with my NOS find cause as they say "Come on down" " The price is right"

Jan 16, 2023 | 01:49 AM

#43

45Brit2021

Cruiser

Joined: Dec 2021

Posts: 110

Likes: 27

From: Cambs

Quote:

Originally Posted by mistermooster

I wonder....

In Britain do the Harleys go "po-tah-to po-tah-to" ?

Or does that rule only apply to tomato and to-mah-to?

Chime in mates.

They go spud-spud-spud.....

Jan 16, 2023 | 05:17 AM

#44

YZR

Grand HDF Member

Joined: Jan 2019

Posts: 3,634

Likes: 2,903

From: Mostly Florida, some Michigan

Quote:

Originally Posted by Indiana Zach

Well crap , I guess I need to start looking at the dates b4 I reply huh? So what is an appropriate amount of time for a post to be untouched b4 you treat it as a sleeping dog and let it lie ?

Just having a bit of fun at your expense 🤣
Welcome to the forum and buckle up!!

Jan 16, 2023 | 05:24 AM

#45

danny54

Tourer

Joined: Sep 2011

Posts: 495

Likes: 69

From: naples fl.

First thing get rid of the cat

Jan 16, 2023 | 11:38 AM

#46

hardheaded

Seasoned HDF Member

Joined: Oct 2012

Posts: 11,224

Likes: 3,049

From: St.Louis Mo.

Quote:

Originally Posted by Rounders

Why would dual fire effect this? My understand is dual fire is just a wasted spark on the non compression cycliner.

That wasted spark just changes the sound somewhat. And i think the single fire makes the engine feel smoother.

Jan 16, 2023 | 12:49 PM

#47

jimglassford

Tourer

Joined: Sep 2011

Posts: 456

Likes: 205

From: Manchester, MI

The low idle speed was also a function of ignition timing. The old bikes could retard the spark so you got the loping idle.

Jan 16, 2023 | 08:51 PM

#48

Rounders

Seasoned HDF Member

Joined: Mar 2021

Posts: 18,452

Likes: 3,719

From: backwoods

Quote:

Originally Posted by hardheaded

That wasted spark just changes the sound somewhat. r.

I find this hard to believe. Its just sparking, on a stroke with no gas

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Jan 16, 2023 | 09:43 PM

#49

Seasoned HDF Member

Joined: Mar 2012

Posts: 100,455

Likes: 19,811

From: Centennial, CO

@Indiana Zach
Hahaha! see what you started?
Better come along for the ride!

Aug 7, 2023 | 09:42 AM

#50

GB1972

Stage III

Joined: May 2022

Posts: 3

Likes: 0

From: Illinois

EFI manual idle adjuster

Quote:

Originally Posted by flhxi06

Anybody know how to get that good old potato-potato idle out of a fuel injected twin cam motor ????? Id give anything to get the sound of my old evo heritage in my SG.

yes the El Potato IAC will help with EFI. The IAC on Harley TC is garbage. I installed the El Potato and love the manual idle adjustment. I left the factory IAC connected and zip tied it out of way. Install manual IAC. Well worth $184. Keep in mind that you do not want to idle less than 950 rpm for long periods of time due to oil pressure.

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