What gives a motorcycle (2 cylinders) that deep rumble? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

eb_SS · 10-24-2010, 06:25 PM

In addition to what is mentioned above, I remember reading that the air cooling of the engine contributes to the sound as well. Possibly a water cooled engine buffers the sound a bit.

SmokinBills 2SS · 10-24-2010, 06:47 PM

How 'bout this........
http://s376.photobucket.com/albums/o...t=MOV00007.flv

TJ91 · 10-24-2010, 08:03 PM

Quote:

Originally Posted by Seminole

Displacement per cylinder is what you're looking for.
Think of the thump of a little firecracker compared to a big one. Six little firecrackers may have more total powder, but firing off one at a time they don't make the same thump.

Wow great analogy, that really cleared it up for me

scrming · 10-24-2010, 08:13 PM

the distinctive harley sound is really due to the single crankshaft pin.... from the link above:

The difference in the Harley engine is that the crankshaft has only one pin, and both pistons connect to it. This design, combined with the V arrangement of the cylinders, means that the pistons cannot fire at even intervals. Instead of one piston firing every 360 degrees, a Harley engine goes like this:

* A piston fires.
* The next piston fires at 315 degrees.
* There is a 405-degree gap.
* A piston fires.
* The next piston fires at 315 degrees.
* There is a 405-degree gap.

And the cycle continues.

At idle, you can hear the pop-pop sound followed by a pause. So its sound is pop-pop...pop-pop...pop-pop. That is the unique sound you hear!

RipperFox · 10-24-2010, 08:41 PM

HD, the most effiecent way to turn gasoline into noise without the side effect of HP.

Diabel1969 · 10-25-2010, 08:31 AM

Quote:

Originally Posted by RipperFox

HD, the most effiecent way to turn gasoline into noise without the side effect of HP.

and there's one in every crowd.......

SwedeandBlondie · 10-25-2010, 08:57 AM

Quote:

Originally Posted by Diabel1969

and there's one in every crowd.......

+1

Z28RockStar · 10-25-2010, 09:18 AM

feeling bashed here LOL

Russell James · 10-25-2010, 10:09 AM

Sometimes it's nitromethane that gives those 2 big cylinders that deep rumble.

King Mouse · 10-25-2010, 10:51 AM

Nobody has mentioned stroke. A Harley has a longer stroke compared to most other engines. This is why the ricers are so slow off the line. Their stroke is shorter which keeps them from making power in the low rpm range. It is a battle between torque and horsepower with HD being a torque base engine and the shorter stroke engines being HP based engines. There is always a trade off between the two. The potato, potato sound is the added bonus.

HDDAN · 10-25-2010, 11:17 AM

It does it because of cylinder displacement. If you took my 96" V-2 and multiplied it by four you would get a 384" V-8 and it would rumble. If you took a six cylinder Camaro and cut off 4 cylinders you would only have a 48 CI V-twin and that would not sound like a Harley, it would sound like a Honda copy of a Harley because it would only have half of the displacement per cylinder. 3 Harley cylinders equal 1 Camaro V-6 displacement wise, but each cylinder in the V-8 is almost the same as the Harley.

Revo1 · 10-25-2010, 11:18 AM

BIG cylinders/pistons.

ZED SLED · 10-25-2010, 11:45 AM

Quote:

Originally Posted by HDDAN

It does it because of cylinder displacement. If you took my 96" V-2 and multiplied it by four you would get a 384" V-8 and it would rumble. If you took a six cylinder Camaro and cut off 4 cylinders you would only have a 48 CI V-twin

V6= 3600cc/16.393=219.6CI/6=36.6CI per cylinder x2=73.2CI. Should sound like a 1200. Maybe need facial hair and tats?

LoneStar · 10-25-2010, 01:46 PM

Quote:

Originally Posted by scrming

the distinctive harley sound is really due to the single crankshaft pin.... from the link above:

The difference in the Harley engine is that the crankshaft has only one pin, and both pistons connect to it. This design, combined with the V arrangement of the cylinders, means that the pistons cannot fire at even intervals. Instead of one piston firing every 360 degrees, a Harley engine goes like this:

* A piston fires.
* The next piston fires at 315 degrees.
* There is a 405-degree gap.
* A piston fires.
* The next piston fires at 315 degrees.
* There is a 405-degree gap.

And the cycle continues.

At idle, you can hear the pop-pop sound followed by a pause. So its sound is pop-pop...pop-pop...pop-pop. That is the unique sound you hear!

Like a heart beat!!!

10-24-2010, 06:25 PM	#15
eb_SS Drives: 2011 Camaro 2SSRS SGM Join Date: Sep 2010 Location: Rhode Island Posts: 89	In addition to what is mentioned above, I remember reading that the air cooling of the engine contributes to the sound as well. Possibly a water cooled engine buffers the sound a bit. __________________ -EB

10-24-2010, 08:13 PM	#18
scrming Red Brick of Vengeance! Drives: 12 Second Brick Join Date: Jun 2009 Location: at my pulpit Posts: 7,745	the distinctive harley sound is really due to the single crankshaft pin.... from the link above: The difference in the Harley engine is that the crankshaft has only one pin, and both pistons connect to it. This design, combined with the V arrangement of the cylinders, means that the pistons cannot fire at even intervals. Instead of one piston firing every 360 degrees, a Harley engine goes like this: * A piston fires. * The next piston fires at 315 degrees. * There is a 405-degree gap. * A piston fires. * The next piston fires at 315 degrees. * There is a 405-degree gap. And the cycle continues. At idle, you can hear the pop-pop sound followed by a pause. So its sound is pop-pop...pop-pop...pop-pop. That is the unique sound you hear! __________________ 2011 Ford Flex EcoBoost Limited - 12.727 @ 109.790 MPH

10-24-2010, 08:41 PM	#19
RipperFox Grrr!!! Drives: BLK/IOM '11 2SS/RS Join Date: Jul 2010 Location: OK Posts: 380 View My Garage	HD, the most effiecent way to turn gasoline into noise without the side effect of HP. __________________ Rules for ordering a car. 1. Dealers are liars 2. Buy off the lot 3. See rule #1

10-25-2010, 09:18 AM	#22
Z28RockStar Drives: 2SS/RS CGM 6M, 2007 Harley Deluxe Join Date: May 2010 Location: Dallas Tx Posts: 1,981	feeling bashed here LOL __________________ Who doesn't love puppies and beer?

10-25-2010, 11:18 AM	#26
Revo1 Don't Like it? Suggit. Drives: 2010 2SS/RS Join Date: Aug 2008 Location: Fresno, CA Posts: 14,832 View My Garage	BIG cylinders/pistons. __________________ "Tops off, tach up baby- loud and proud!" A Camaro lover from day one- 1996 3.8 V6 Camaro, to 1996 5.7 LT1 Camaro Z28, to the sold 2002 5.7 LS1 Camaro SS, and NOW, a [I]6.2 L99 VR 2SS/RS: XS Power stainless full exhaust, Airaid CAI, BMR drop springs and sways, custom tune by Cal Speed- 411rwhp

10-24-2010, 06:47 PM	#16
SmokinBills 2SS Drives: 2SS Cammed up, Clear Bra, Clean Join Date: Jan 2010 Location: Roseville Posts: 405 View My Garage	How 'bout this........ http://s376.photobucket.com/albums/o...t=MOV00007.flv

10-25-2010, 10:09 AM	#23
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	Sometimes it's nitromethane that gives those 2 big cylinders that deep rumble.

10-25-2010, 10:51 AM	#24
King Mouse Drives: EXT Join Date: Nov 2008 Location: Western PA Posts: 416	Nobody has mentioned stroke. A Harley has a longer stroke compared to most other engines. This is why the ricers are so slow off the line. Their stroke is shorter which keeps them from making power in the low rpm range. It is a battle between torque and horsepower with HD being a torque base engine and the shorter stroke engines being HP based engines. There is always a trade off between the two. The potato, potato sound is the added bonus.

10-25-2010, 11:17 AM	#25
HDDAN Drives: 2010 Camaro 1SS 2007 HD FLSTC Join Date: Aug 2009 Location: Boston MA Posts: 1,510	It does it because of cylinder displacement. If you took my 96" V-2 and multiplied it by four you would get a 384" V-8 and it would rumble. If you took a six cylinder Camaro and cut off 4 cylinders you would only have a 48 CI V-twin and that would not sound like a Harley, it would sound like a Honda copy of a Harley because it would only have half of the displacement per cylinder. 3 Harley cylinders equal 1 Camaro V-6 displacement wise, but each cylinder in the V-8 is almost the same as the Harley.

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