Nic Posted August 12, 2002 Share Posted August 12, 2002 Anyone know what the fuel dampener does? PHR do a fuel dampener by-pass pipe, what if any advantage does this give? Anyone got one fitted? cheers Quote Link to comment Share on other sites More sharing options...
GavinL Posted August 12, 2002 Share Posted August 12, 2002 Originally posted by Nic Anyone know what the fuel dampener does? PHR do a fuel dampener by-pass pipe, what if any advantage does this give? Anyone got one fitted? cheers Well the the fuel dampener smooths out the pulses made by the fuel pump, however it also presents a restriction to the injectors and places a limit on the fuel system which doesn't go down very well over the water as it stops them using the stock fuel system to run single turbo's Fitting a by pass pipe removes/reduces the restriction and increases the capacity of the fuel system. Personally I see it as a bodge. Quote Link to comment Share on other sites More sharing options...
Alex Posted August 12, 2002 Share Posted August 12, 2002 Wouldn't it be a good idea to replace it with a swirl pot and some de-restriction hoses??? A swirl pot would cut out the pulses yet still make sure you have ample fuel. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted August 12, 2002 Share Posted August 12, 2002 I think it actually removes the pulses caused by the injectors switching on and off and not so much the pump. Swirl pots??? Have you been hanging about with the Cossie boys Alex ? Quote Link to comment Share on other sites More sharing options...
Alex Posted August 12, 2002 Share Posted August 12, 2002 How can it remove the pulses (or smooth them) when its before the injectors in the fuel chain??? Cossie's no...just CW way back when I was thinking about upgrading the fuel lines etc... Paul Whiffin fitted a bypass kit but then changed to a big single and its appropriate fuel system. Nic, As you've got the engine out this maybe the time to get the injectors upgraded... Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted August 12, 2002 Share Posted August 12, 2002 Originally posted by Alex Holdroyd How can it remove the pulses (or smooth them) when its before the injectors in the fuel chain??? How am i supposed to know, did i design it ? I've seen it somewhere, i thought it was in the NCF '93 book but can't find it at the mo. From what i can remember if your injectors are connected to the high pressure fuel line then as they start to fire in sequence then they can setup oscillations in the fuel line due to the increase and decrease in pressure as they open and close. The damper attempts to remove these oscillations, although what the consequence is of not having a damper is, i'm unsure. That could all be wrong, but it does make a kind of sense. Anybody want to explain to me what a swirl pot is supposed to do, apart from look pretty Quote Link to comment Share on other sites More sharing options...
Alex Posted August 12, 2002 Share Posted August 12, 2002 Swirl Pot = funky resevior which is directly fed by the fuel pump it allows for discrepancies in the fuel amount supplied from the tank which are caused in high G manouveres. Think of it as a mini fuel tank. It also adds about a litre to your tank capacity!! The fuel literally swirls around inside it...hence the name...That's about the best explanation I can do in normal language whilst at work...CW will be able to fill in the blanks. I can see why the damper is there...just can't work out why they would let it be a restriction! Though they only ever fueled the car for 550's on stock Turbo's, they just didn't give us tuners a second thought!! Is the damper on the UK spec the same as the J-spec? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 12, 2002 Share Posted August 12, 2002 Originally posted by Nic Anyone know what the fuel dampener does? PHR do a fuel dampener by-pass pipe, what if any advantage does this give? Anyone got one fitted? cheers The pulsation dampener is there purely to stop noise. The injectors can set up a resonance at certain speeds in the fuel lines of some cars, which can be surprisingly loud. If you like you can remove / bypass it. Unless you are building some monster i doubt it's worth the hassle. On the FD model RX-7 they are known to leak, right onto the manifold of the turbo.... On THAT car it's a good idea to renew or bin it :-) Quote Link to comment Share on other sites More sharing options...
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