any help?
hey guys got a question for you.what would happen if the fuel damper in my vr stopped working.
( .Y. )
Banned
do you mean regulator? If so they give away and allow extra fuel back threw the intake, it will be hard to start, stall, and blow lots of black smoke on you
The fuel damper is located near the throttle body,Id say,and its name suggests, that it "soaks up" any peak fuel pump pressures,or as the fuel regulator regulates the fuel pressure.Ive read somewhere before about some people who have had problems before with metal fuel lines rattling against the cars body/chassis while the car is running ,causing a weird noise.Apparently the fuel damper helps stop this happening ..Actually theres a similar thing available for house water pipes,it stops "fluid hammer" from making the water pipes rattle when a tap is turned on or off.It soaks up the peak pressures..
Last edited by Brett_jjj; 08-05-2011 at 02:38 PM.
on a vr v8 the damper is located on a bracket on the cylinder head as part of the fuel supply pipe just before the fuel injection rail. It is a can with an inlet pipe and an outlet pipe. You can blow straight through it and detect nothing in the way of internal anything? Nothing to see inside at all except the long end of the mounting stud. I do not see how it can "stop working" unless it springs a leak in the casing.
Last edited by yxyx64; 27-02-2012 at 04:09 PM.
Real cars are steel cars.
Dampens the vibrations caused by the sudden opening and closing of the injectors. (vibration is easily transferred through liquid).
You might hear some odd sounds from the fuel lines, that's about it.
If I told you I was a compulsive liar, would you believe me?
Take it out/Take it Back
Sigh. This is what happens when you just search google for an answer of what a damper does. As the VR uses simultaneous fuel injection, the wave pulse from the injectors isnt the main reason for its installation.
The fuel damper dampers the oscilations from the fuel pump. The fuel pumps dont pump in a linear fashion, they are a rotary design and the fuel flow isnt a constant stream. THe damper ensures that the fuel rail sees a steady flow.
Originally Posted by ari666
backyard argument starter
good thread dig there, this threads only like just nearly a year old lol
NEED 4 SPEED
Slayer of Stupid Threads
For someone who likes to tell moderators when they should close derailed threads and telling people to stay on topic, perhaps so should you.
The thread was dug instead of creating a new one and useful information, that wasnt there already, was added. So GTFO.
backyard argument starter
just extending the same courtesy that has always been extended to me when i have dug an old thread up
and i didnt tell the moderators to close it i meerly made a sugestion
Real cars are steel cars.
Did not search Google. This is what I had learnt 20 odd years ago.
Apologies to all if the information I posted is no longer current.
If I told you I was a compulsive liar, would you believe me?
my thoughts...
the fuel rail may be subject to flow but it "sees" a fuel pressure (due to the regulator) but this is not a fixed pressure but a varying pressure if a rising rate regulator is used. The genuine regulator is rising rate (that is what the vacuum hose is for).
If the damper was so important to the pump why would it be placed just before the injectors and not 4 metres further back down next to the pump. Why let the "problem" caused by the pump travel all the way along the lines before you "fix"it?
Batch fire injection is MORE of a reason that a reverse pressure wave would be produced within the fuel line (not less of a reason) due to all closing almost together. Batch fire makes this problem worse than a sequential setup.
I may be wrong but I can only think that the reversion pulse (produced by the closing injectors stopping the momentum of the moving fuel) travels back along the fuel line towards the fuel pump and the damper allows this pressure pulse to suddenly expand outwards (transversely) due to the sudden diameter change inside the can compared to the 8mm hose and this pretty much dissipates the energy of the pulse and basically gets rid of it.
of course fluid dynamics was never my strong point......that is why I never understood why the header pipes on an alcohol fuelled dragster change to smaller diameter halfway along the pipes length whereas a nitro fuelled motor keeps a constant diameter header pipe. Is the diameter change to do with a reversion pulse inside the exhaust port to help with valve overlap problems or is it to do with increasing flow velocity out of the end of the pipe and helping exhaust port scavenging.......then why dont nitro motors need the same thing? Do they use not nearly as much valve overlap as an alcohol motor?
Last edited by yxyx64; 27-02-2012 at 04:52 PM.
in a vl it was mounted to the external pump, vn and up it was moved to near the fuel rail, as stated all it does is removed the pulse created by the fuel pump, doesn't matter where it is although closer to the engine makes more sense, it's not important for the pump but is for the injectors.
If it was left where the VL had it the lines may pickup extra vibrations and harmonic resonance from the body where the fuel line is in contact with the body (small chance of this but still possible).
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