|
|
|
|
| Author |
|
|
Registered
|
Fuel rail Question
I currentley own 2 porsches. A 87 924S (my toy) and a Late 944 (smashed and got it for parts). I dont know if anyone else has noticed this before but on both of my cars on the fuel rails I noticed that the front Damper is craked off the fuel rail (looks like metal fatigue) Has anyone noticed this on any other Porsches??? What would cause this??
Is there really a need for the dampener on the Fuel rail? Why is there a vacuum line comming from the dampener? Sorry Im just full of questions, Thanx for the help
__________________
1986 951, Stock for now. ]87 924S Gaurds red- SOLD after 11 years of ownership |
||
02-24-2004, 05:26 PM
|
|
|
Registered
|
The dampener is the one with the pressure hose going to it. Or to put it another way the regulator is the one with the clamp on the return hose.
The box that comprises the fuel rail is real thin tubing. Anything can cause the mountings to crack and the rail to leak. Often this is misaligned balance shaft pulleys or having the belt off a bit. Always use two wrenches to take the regulator and dampener off/on the rail.
__________________
Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
||
|
02-24-2004, 05:40 PM
|
|
|
Registered
Join Date: Dec 2002
Location: St. Petersburg, Florida
Posts: 1,990
|
Doesn't the damper soften the pulsing effect of fuel coming from the fuel pump?
__________________
83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
|
||
|
02-24-2004, 05:50 PM
|
|
|
Registered
Join Date: Jan 2003
Location: Idaho Falls, ID
Posts: 1,199
|
Quote:
Some early EFI cars (non porsche) suffered rich or lean conditions at certain rpm's..........in these cars it was decided that the injector pulse was at the same frequency as the pressure spike caused by the fuel pump. 
__________________
75 914 - Undecided. 80 931 - Gone, but not forgotten. 72 914 - old toy- sold. And a whole bunch of German scrap metal shaped like 924's. Old enough to know better, and stupid enough to do it anyway! |
||
|
02-24-2004, 05:59 PM
|
|
|
Registered
|
It also acts as a pressure reserve, When a fuel injector opens pressure in the fuel rail falls a little, When alot of injectors are opening and closing a million times a minute you start to get high and low pressure spikes. The dampener takes away the spikes and smoothens out the pressure to have one constant fuel rail pressure. IT DOESNT CONTROLE THE ACTUAL PRESSURE IN THE FUEL RAIL... Thats the job for the fuel pressure regulator. I also dont think the Dampener has anything to do with the fuel pump . But I could be wrong
__________________
1986 951, Stock for now. ]87 924S Gaurds red- SOLD after 11 years of ownership |
||
|
02-24-2004, 06:27 PM
|
|
|
Registered
|
Ok. how would you know if your dampner was bad? wha would the car be doing?
__________________
Texas hosts the 928 Owner’s Club OCIC in 2009 www.928ocicdfw09.com 1980 928 5 speed and a few mods..........  928 OC member PCA member |
||
|
02-24-2004, 08:01 PM
|
|
|
|
Registered
Join Date: Dec 2002
Location: St. Petersburg, Florida
Posts: 1,990
|
"suffering rich and lean conditions"?
ie. funny idle
__________________
83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
|
||
|
02-25-2004, 01:33 PM
|
|
1987 Porsche 924S 2.5 modified
1983 Porsche 944 2.5 liter
