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post #1 of 31 (permalink) Old 03-21-2012, 09:19 AM Thread Starter
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idle ?

Has anyone here adjusted their idle (slow it down) to get more of a harley sound. Love the harley sound but hate the vibration and lack of reliability.

I know know you shouldn't go too low but can you get close?
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post #2 of 31 (permalink) Old 03-21-2012, 09:32 AM
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Originally Posted by Dcrew View Post
Has anyone here adjusted their idle (slow it down) to get more of a harley sound. Love the harley sound but hate the vibration and lack of reliability.

I know know you shouldn't go too low but can you get close?

Short answer NO, the 9 will never sound like a harley, do not lower idle past 950. For many reasons.

It can sound like a high end sports car with the right pipes and tune.

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post #3 of 31 (permalink) Old 03-21-2012, 09:46 AM
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Go under 1000 rpm and you're running the risk of not providing enough motion to keep the oil well circulated and/or the battery charging properly. Plus, our FI engine just won't develop that Harley "lope" you're looking for. Bytehead's right, though... with the right pipes and mix our 9'er sound durn sweet. I enjoy my own rumble with just a debaffle.

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post #4 of 31 (permalink) Old 03-21-2012, 10:18 AM
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The "secret" to the Harley sound is the single pin crank. The pistons are connected to each other, and as such, each cylinder fires right after one another, and work ALMOST in unison, creating that "potato potato" sound (as well as the vibration). Our engines use a crankshaft, which puts the pistons at opposite ends, when one is at top dead center, the other is bottomed out. This generates a smoother ride and makes more horsepower, but you'll never get the harley sound that way.

http://www.animatedpiston.com/Evo.htm

There's an animation of a Harley engine so you can see what I mean.

NO exhaust will produce a Harley sound on any crankshaft engine.

I agree though. Keep your idle up. It's not good for the engine to be running that low.

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Last edited by Romans5.8; 03-21-2012 at 10:28 AM.
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post #5 of 31 (permalink) Old 03-21-2012, 10:31 AM
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The only way to get that "Harley sound," is to get a Harley.

BTW, can someone tell me how to read the engine rims at idle when you don't have a tachometer? Thank.

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post #6 of 31 (permalink) Old 03-21-2012, 10:33 AM
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Quote:
Originally Posted by Romans5.8 View Post
The "secret" to the Harley sound is the single pin crank. The pistons are connected to each other, and as such, each cylinder fires right after one another, and work ALMOST in unison, creating that "potato potato" sound (as well as the vibration). Our engines use a crankshaft, which puts the pistons at opposite ends, when one is at top dead center, the other is bottomed out. This generates a smoother ride and makes more horsepower, but you'll never get the harley sound that way.

http://www.animatedpiston.com/Evo.htm

There's an animation of a Harley engine so you can see what I mean.

NO exhaust will produce a Harley sound on any crankshaft engine.

I agree though. Keep your idle up. It's not good for the engine to be running that low.
Wow thanks for a great lesson. Learned something new.


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post #7 of 31 (permalink) Old 03-21-2012, 10:37 AM
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Quote:
Originally Posted by Nomad46 View Post
The only way to get that "Harley sound," is to get a Harley.

BTW, can someone tell me how to read the engine rims at idle when you don't have a tachometer? Thank.
I actually have an app for my iPhone that reads RPM's by sound. I guess the idea being, each time there is a 'pop' from the exhaust it counts it, and figures it in based on the configuration (2 cylinder 4 stroke). Seemed to work for me.

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post #8 of 31 (permalink) Old 03-21-2012, 10:44 AM
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Originally Posted by Romans5.8 View Post
The "secret" to the Harley sound is the single pin crank. The pistons are connected to each other, and as such, each cylinder fires right after one another, and work ALMOST in unison, creating that "potato potato" sound (as well as the vibration). Our engines use a crankshaft, which puts the pistons at opposite ends, when one is at top dead center, the other is bottomed out. This generates a smoother ride and makes more horsepower, but you'll never get the harley sound that way.

http://www.animatedpiston.com/Evo.htm

There's an animation of a Harley engine so you can see what I mean.

NO exhaust will produce a Harley sound on any crankshaft engine.

I agree though. Keep your idle up. It's not good for the engine to be running that low.
I agree that you shouldn't set your idle too low, but it seems to me that the V900 engine also has a single-pin crank.

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post #9 of 31 (permalink) Old 03-21-2012, 10:54 AM
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Originally Posted by MINI NSX View Post
I agree that you shouldn't set your idle too low, but it seems to me that the V900 engine also has a single-pin crank.

http://www.bikebandit.com/houseofmot...7945#sch579313
Well shucks ya learn somethin' new every day.

But something is still making it sound different. Those Harley's are running just as fast as our engines are but sounding like that, so it's not engine speed (Yes, they idle around 1,000)

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post #10 of 31 (permalink) Old 03-21-2012, 10:59 AM
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Another site that shows the different between single and dual pin cranks.

CLICKY


Jeff, Twin Cities, MN


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