entropy
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posted March 18, 2009 03:15 AM
 Edited By: entropy on 18 Mar 2009 11:21
pulsating fuel pressure - a cure!!
A couple weeks ago on the dyno I noticed that at 6000rpm+ (and maybe lower, didn't check), the needle on my fuel pressure gauge fluttered from 35-ish to 45-ish psi.
Tim + Jim + Doug each said that the pulsing was bad ju-ju.
Jim (Y2K) suggested I install a Marren pulsation damper.
Don (lowflyer) helped me with fittings and 1/4NPT tap, install was not too bad.
(Don, I'm gonna have to buy you a new tap, cause I ground about 3/8" off yrs…)
Yesterday in the garage, i brought it to 7000rpm and held it for a bit: wild pulsing was gone, just a lil bit of needle twitching.
WOO-HOO!
Why was it pulsing? No idea.
New-ish Muzzy pump w/RC370 injectors, OEM pressure regulator.
Will it make more hp? Who knows, but I like successful experiments.
(Gerard, this one's you; I KNOW you like experiments)
Thanks guys!
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Marren Hydraulic Pulsation Damper
[link]http://www.injector.com/fueldampers.php[/link]
Designed to absorb the hydraulic shocks produced in fuel rails by the opening and closing of injectors. Will help eliminate fuel pressure "bounce" and uneven fuel distribution. Red-anodized, billet aluminum body features a Schrader valve test port for fuel pressure and sample checks. Inlet is 3/8" NPT
Do I need a fuel damper in my fuel system?
This is a question that we often hear from our customers. The easiest way to find out is to monitor your vehicle’s fuel pressure at peak power, wide open throttle. A session on the chassis dyno is recommended for this test. Do NOT use a liquid-filled or dampened fuel pressure gauge for this test! At peak power, the fuel pressure gauge should not flutter more than 4-5 PSI. Also, a damper is recommended if one of more of the following conditions exist:
Batch-fire injection is used
Engine RPM will exceed 8000 RPM
5 or more injectors are used per fuel rail
To replace a factory-installed fuel damper
For high-power applications, it is recommended that a damper be installed on EACH fuel rail for maximum effectiveness.
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oldkawboy
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posted March 18, 2009 05:14 AM
Good info Karl.
Is this a great board or what ?
Thanks to all who contribute.
Dan
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entropy
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posted March 18, 2009 06:36 AM
quote:
Good info Karl.
Is this a great board or what ?
Thanks to all who contribute.
Dan
damn sure is a great board, but i'd have a buncha money if i never got into this stuff! 
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WRECKSHOP
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posted March 18, 2009 06:57 AM
Next question is how do you install it ???
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WRECKSHOP
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posted March 18, 2009 06:59 AM
What kind of bike did you do the install on ??
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entropy
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posted March 18, 2009 07:19 AM
Wreckshop,
i have a ZX12
i pulled the TB's removed the rail, drilled & tapped the r end of the rail for 1/4" pipe fitting, hung the Marren off it.
I don't advise doing this unless you have a fuel pressure pulsation problem.
If you do have an issue, and from yr profile i see you are here in houston, i will help directly.
Karl
BTW: what part of Hou are you in?
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TRNorBRN6001
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posted March 18, 2009 08:44 AM
Perty neat stuff! How is Lowflyer doing? Is he all ready for the Mile?
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entropy
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posted March 18, 2009 08:50 AM
quote:
Perty neat stuff! How is Lowflyer doing? Is he all ready for the Mile?
yep, that Kizer 12 is making great hp!
Don has got it parked, ready to roll.
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TRNorBRN6001
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posted March 18, 2009 09:24 AM
Man-O-Man it's going to be a good turn out for 12's and TFA!!!
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lowflyer
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posted March 18, 2009 05:45 PM
Yeah, can't wait!! BTW Karl, the Plastic Bucket did spit out a new 1/4 pipe tap, so we are both set. See you there!
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WRECKSHOP
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posted March 18, 2009 06:02 PM
I'm from the East end Of Houston, Northshore federal road area going towards Baytown....Okay is it just the ZX-12's that have the problems with pulsating fuel pressure or does the ZX-10's and ZX-14's have the same problem as well ???
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TRNorBRN6001
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posted March 18, 2009 08:52 PM
Isn't that SlepperBusa's neck of the woods?
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entropy
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posted March 18, 2009 10:13 PM
quote:
I'm from the East end Of Houston, Northshore federal road area going towards Baytown....Okay is it just the ZX-12's that have the problems with pulsating fuel pressure or does the ZX-10's and ZX-14's have the same problem as well ???
WRECKSHOP
I haven't heard of the 10 or the 12 or the 14 with pulsating fuel pressure.
Come to think of it, i'd never heard of pulsating fuel pressure till i saw my gauge acting funny and started asking around.
My heap is modified and has all kinds of strange ailments.
Wreck, are you coming down to the Texas Mile? Only happens twice a year.
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entropy
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posted March 18, 2009 10:25 PM
quote:
Isn't that SlepperBusa's neck of the woods?
Chris is further E, near Beaumont.
He's got a buncha irons in the fire, not gonna make the Mile 
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TRNorBRN6001
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posted March 19, 2009 06:13 AM
Sad to hear that, but I'll bet we see him in October.
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WRECKSHOP
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posted March 19, 2009 07:08 AM
No, i'm not going to make it this time but i'm definately going to make it in October.....Don't know of a SleeperBusa on this side of town. Maybe, BlackBusa rider that now rides a red ZX14 at the 1/8 mile track (Neil) ???
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WRECKSHOP
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posted March 19, 2009 07:19 AM
How would it hurt the motorcycle if i wanted to install one just for a peace of mind and not testing it for the pulsating fuel pressure. i rev my ZX-10 to 13,750 rpm's and have no clue if it's pulsating at that high rpm's. It says that if you are revving past 8,000 rpm's that it is recommended to have one installed ?? i wonder what would the difference be if installed and there was not a problem, would it make the bike run different or would it cause it to do something funny or different ??
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NINJA12
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posted March 19, 2009 07:20 AM
quote:
Will it make more hp? Who knows, but I like successful experiments.
(Gerard, this one's you; I KNOW you like experiments)
Karl, you are right , I can't wait to hear you found your lost horses.
Right now I have so many irons that I fell like I'm drowning.
Bike is back together , idles good runs like crap above 2K.
i think the map sensor is seeing boost, but no time to work on it now.
When are you going to the dyno?
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entropy
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posted March 19, 2009 09:21 AM
hey Gerard!
I don't think i'll find any significant hp, but it was VERY cool to see the effect of the damper.
Not going to the dyno until after the Texas Mile (the BIG dyno).
How much boost are you running? This is yr 14, yes?
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KZScott
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posted March 19, 2009 01:51 PM
how does it work? kinda like a surge tank or?...
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01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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NINJA12
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posted March 20, 2009 08:47 AM
quote:
hey Gerard!
I don't think i'll find any significant hp, but it was VERY cool to see the effect of the damper.
Not going to the dyno until after the Texas Mile (the BIG dyno).
How much boost are you running? This is yr 14, yes?
Yes the 14, I'm going to try 8-10psi on pump gas,maybe 10-14 on c16 (rare).
I still ride to work and want to be able to ride straight to the track , play, then ride home.
A Pump gas tune makes everything easy.
8 psi and pump didn't work so well at stock compression(boom), but now I have lowered compression and good valve springs. I highly recommend the Cycle-logic turbo @ 4psi
with stock motor, it was great!
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entropy
Moderator
Posts: 8671
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posted March 20, 2009 07:08 PM
quote:
quote:
hey Gerard!
I don't think i'll find any significant hp, but it was VERY cool to see the effect of the damper.
Not going to the dyno until after the Texas Mile (the BIG dyno).
How much boost are you running? This is yr 14, yes?
Yes the 14, I'm going to try 8-10psi on pump gas,maybe 10-14 on c16 (rare).
I still ride to work and want to be able to ride straight to the track , play, then ride home.
A Pump gas tune makes everything easy.
8 psi and pump didn't work so well at stock compression(boom), but now I have lowered compression and good valve springs. I highly recommend the Cycle-logic turbo @ 4psi
with stock motor, it was great!
how badly did you hurt the 14??
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whitehendrix
Zone Head
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posted March 20, 2009 11:05 PM
interesting.. more and more crazy stuff i learn every day.
i would think (personally here.. just my possibly wrong 2 cents) that the pulsation is caused from a "harmonic" reached due to the frequency of the injectors opening.. it's called pressure piling.. once the pressure reaches a dead end it's going to either be absorbed or reflected, thus causing waves or pulses.. certain freqs will generate multiples of that root freq and it'll get progressively more intense.. (within reason) even tho (assuming) its a friction pump, there are minute pulses generated strictly due to the nature of how the gas is pressurized and pumped.. i think a centifugal pump is about the only type of pu,p that won't prduce any pulses at all.. gear and friction pumps are in insanely close second tho.
the whole effect can be thought of as water hammer when you shut the faucet off quickly.. flow and pressure are up and going then all of a sudden.. no taper down to stop.. it's just STOP. do that at the right intervals and you can probably shake the pipes apart in your house and piss your neighbors off trying to take a shower.
your thoughts?
very interesting tho.. +1 for the easy fix !!!!
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Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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ninja12
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posted March 21, 2009 04:18 PM
quote:
[
how badly did you hurt the 14??
Melted the corners on a couple piston.
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KZScott
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high on speed
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posted March 22, 2009 12:54 AM
really good excuse to put in forged stuff
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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