Zippers 3"/4" Billet Velocity Stacks for V-Rods - 1130cc.com: The #1 Harley Davidson V-Rod Forum
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Old 09-21-2012, 02:49 AM   #1
Spiderman
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Zippers 3"/4" Billet Velocity Stacks for V-Rods

I have a question, I use the SE Destroyer 58mm Throttle body with the plastic Velociy Stacks. I wannt to change them. Does anybody youse the Zippers Billet Velocity Stacks.

Best Gegards Chris
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Old 09-21-2012, 02:55 AM   #2
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WHY would be the first question I'd ask?

When Zippers says anything about "slight modification to lower airbox cover required" - this means if you DON'T LIKE THEM - you're going to have to replace your hacked up airbox cover.

Cost - versus performance - versus "hacking" involved - probably NOT WORTH IT.

I believe I considered and dismissed these (even when I DIDN'T have a hard-on for Zippers)

Rick
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Old 09-21-2012, 07:46 AM   #3
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Yea playing with stacks yields something like, literally .05hp. I'm running the stock stacks & my power curves are nice & smooth. You make the call
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Old 09-21-2012, 09:06 AM   #4
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I'm running a set of aluminum stacks that look just like those that I got from Eagle HD back in 2006 when I did my 1350. I did not modify the air box, but I did notch the large screw mount on the stack to clear the retangular raised rib that surrounds the idle air intake port on the air box. Been working very well for almost 6 years now.

Mike
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Old 12-08-2012, 08:13 PM   #5
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there is hp to be found in stack design...a friend used our old stacks for 58 tb`s and compared to the zipper`s stacks he had... ours made about 4 more hp...the taper and entry radius is critical as is the overall length....i have seen as much as 10 hp differences with different velocity stacks...i wish i understood the whole thing better and had more time to test things...all i can say is velocity stacks can make as much difference in hp as a good exhaust pipe...
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Old 12-13-2012, 03:32 AM   #6
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Agree with lbrown

How does Zipper's differ from the Destroyer's? VH also makes a set, anyone knows how they compare?
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Old 12-14-2012, 12:46 PM   #7
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The Destroyer velocity stacks are both short and designed to work at WOT. For normal street riding where a wider power band is required, you need longer stacks and stacks tuned for the length of each cylinder's exhaust header, as most V-Rod exhausts do not have equal length headers.

My interest in the Zippers velocity comes from my own plan to have Fitzgerald bore a spare TB I have out to 58 mm, along with boring the holes in the bottom of the air box if that is necessary. Fitzgerald bores the ID of the stock plastic velocity stacks to match the new TB bore, but 5 mm off the ID of the stock stacks doesn't leave much material. I am wondering if the Zippers aluminum stacks for a 58 mm bore would be a better choice, but don't know enough about them yet.

Anyone have photos of these parts?
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Old 12-14-2012, 04:19 PM   #8
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I have 58mm 1 3/8 stacks, same as vance & hines. Front stack has to be trimmed to clear air filter. $150 shipped.
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Old 12-14-2012, 04:28 PM   #9
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Quote:
Originally Posted by VR28 View Post
I have 58mm 1 3/8 stacks, same as vance & hines. Front stack has to be trimmed to clear air filter. $150 shipped.
Lou can you take a pic of tese beside the plastic Destroyer ones? How do they compare? They look shorter, more like the ones in the stage 2 kit right?
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Old 12-14-2012, 04:42 PM   #10
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The Zippers velocity stacks look a lot shorter than the OEM parts, and they flare out further. It looks like you have to notch the air filter or trim some material off the velocity stanck to make them fit. Is that correct?

Btw, thanks for the photos.
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Old 01-10-2013, 10:59 AM   #11
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Did anyone check further on these?
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Old 04-01-2013, 10:49 AM   #12
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Old 04-01-2013, 03:02 PM   #13
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IMHO, unless you are tuning the length of your intake tract to the induction tract pulse of your engine, no advantage will be seen from aftermarket velocity stacks and in fact their use could hurt your performance.

The intake tract length is measured from the face of the intake valve to the end of the tract, or in this case the opening at the top of the velocity stack. To calculate a desirable intake tract length, and using a known representation for the speed of sound, (1,120 ft/sec at 60 degrees Farenheit) the formula looks like this.

2nd pulse =
(1,120 x 1/2 intake duration of cam x 0.96) divided by rpm = intake tract length in inches

3rd pulse =
(1,120 x 1/2 intake duration of cam x 0.705) divided by rpm = intake tract length in inches

4th pulse =
(1,120 x 1/2 intake duration of cam x 0.538) divided by rpm = intake tract length in inches

It is the use of these intake pulses that give you a scavenging effect on filling the cylinder and make the velocity stacks work. The 4th pulse is weaker than the 3rd and so on. It is desirable to use the strongest pulse practical, however shooting for the stronger pulses require a much longer intake tract. Most likely use of the 4th pulse is the one you will be shooting for on the street.

Regards,
Jim
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Old 04-02-2013, 07:04 PM   #14
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Quote:
Originally Posted by Reekax View Post
IMHO, unless you are tuning the length of your intake tract to the induction tract pulse of your engine, no advantage will be seen from aftermarket velocity stacks and in fact their use could hurt your performance.

The intake tract length is measured from the face of the intake valve to the end of the tract, or in this case the opening at the top of the velocity stack. To calculate a desirable intake tract length, and using a known representation for the speed of sound, (1,120 ft/sec at 60 degrees Farenheit) the formula looks like this.

2nd pulse =
(1,120 x 1/2 intake duration of cam x 0.96) divided by rpm = intake tract length in inches

3rd pulse =
(1,120 x 1/2 intake duration of cam x 0.705) divided by rpm = intake tract length in inches

4th pulse =
(1,120 x 1/2 intake duration of cam x 0.538) divided by rpm = intake tract length in inches

It is the use of these intake pulses that give you a scavenging effect on filling the cylinder and make the velocity stacks work. The 4th pulse is weaker than the 3rd and so on. It is desirable to use the strongest pulse practical, however shooting for the stronger pulses require a much longer intake tract. Most likely use of the 4th pulse is the one you will be shooting for on the street.

Regards,
Jim
Looks like a long winded way of saying "leave the damn things alone".
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Old 04-25-2013, 11:21 AM   #15
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Quote:
Originally Posted by Malcomx View Post
Looks like a long winded way of saying "leave the damn things alone".
Hah !

I am not saying that improvement cannot be found by monkeying with them. I am just giving the formulas for proper lengths and saying be sure you know what you are trying to accomplish before spending your $$ on new ones and "stepping in it" so to speak.

Jim
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