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> Fuel System Damper, why not?
yarin
post Feb 6 2006, 01:33 PM
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I couldn't find that much info on here.... Pelican lists a damper in the FI system.

http://www.pelicanparts.com/914/Parts/Fuel...system1_big.htm

Which years and which systems include this? Why leave it out?

I'm building a MS system, do i need a damper in the system? Thanks
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lapuwali
post Feb 7 2006, 12:13 PM
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The two Mazda RX-7s I had (both with EFI) didn't have dampers on them. I can't remember if the only Nissan I owned had a damper or not. The Mazda Miata I had DID have a damper on the rail.

Putting them on the ends of the fuel rails I can see as maybe being useful. The idea is that the pressure in the rail will fluctuate substantially as each injector opens and closes. This could cause some surging in the rail that may affect fuel mixtures from injector to injector and injection event to injection event. It would likely be more useful if you were running BIG injectors, as the pressure changes will be more substantial. Drag guys, who not only run giant injectors, but also tune their engines to within a squeak of blowing up, very likely may see a difference with dampers on the rails.

There are also stories about people claiming to see differences between having a fuel rail fed at one end v. having it fed in the center (esp. true on inline fours or sixes). No hard data, just stories. Also, no evidence that the pressure variations seen in the rails actually made any difference to how the engine ran.

None of this makes any difference on a 914, or a Type 3, since they have so much rubber in the fuel system, and they run at fairly low pressure to start with.


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