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Adismo
Joined: 05 Oct 2008
Posts: 80
Location: Guatemala
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 Posted: Sun Apr 12, 2009 6:33 pm Post subject: New fuel distribuitor (005) what acumulator do i need? |
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I bought the 0 438 100 005 fuel distribuitor becouse at the haynes manual said that i need this part if i want to upgrade it but it doesnt said what accumulator # do i need... ???
Can anyone help me 
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Porsche 924 1977 XK Euro |
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Adismo
Joined: 05 Oct 2008
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| Posted: Mon Apr 13, 2009 3:14 pm Post subject: |
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Please help me
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Ozzie
Joined: 12 Mar 2005
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| Posted: Mon Apr 13, 2009 5:37 pm Post subject: |
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The '77 used two 20cc accumulators
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Porsche 924 1984 (UK import) NA
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Montego Black on black/red
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RC
Joined: 25 Mar 2007
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Location: Australia
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| Posted: Tue Apr 14, 2009 12:09 am Post subject: |
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| Ozzie wrote: | | The '77 used two 20cc accumulators |
Yep. Part # 477 209 083
With a forked hose and double fittings.
Later cars had just one 40cc unit (931 110 140 00) and single fitting hoses.
This is the unit to be retrofitted after changing the fuel distributor, according to Haynes. Most probably initiated by the Porsche parts department accountants rather than their engineers. Personally would at least try it and see what happens using your existing accumulators before considering changing them and fuel lines, brackets, etc. Sure it wont hurt anything, and fail to see how it will affect proper running. At worse it may have hot start problems. Good idea to change the filter before using the new dizzy anyway. |
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Adismo
Joined: 05 Oct 2008
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Location: Guatemala
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| Posted: Tue Apr 14, 2009 2:48 am Post subject: |
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| RC wrote: | | Ozzie wrote: | | The '77 used two 20cc accumulators |
Yep. Part # 477 209 083
With a forked hose and double fittings.
Later cars had just one 40cc unit (931 110 140 00) and single fitting hoses.
This is the unit to be retrofitted after changing the fuel distributor, according to Haynes. Most probably initiated by the Porsche parts department accountants rather than their engineers. Personally would at least try it and see what happens using your existing accumulators before considering changing them and fuel lines, brackets, etc. Sure it wont hurt anything, and fail to see how it will affect proper running. At worse it may have hot start problems. Good idea to change the filter before using the new dizzy anyway. |
Ohhhh thanks RC for the part #
I alredy tried what happened with the new fuel distributor and the old accumulator, and dont start at all becouse the metering valve (at the fuel distributor) has excessive counter pressure and the sensor plate dont lifted; in other words the entire fuel system has a excessive presure
Again thanks RC
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Smoothie
Joined: 01 Jan 2003
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| Posted: Tue Apr 14, 2009 3:29 am Post subject: |
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If you have the single 20cc accumulator setup, upgrade to the single 40cc.
If you have the double 20cc setup and neither leaks, you can stay with what you have. -Or upgrade to the single 40cc as preventative maintenance if you like.
-But the accumulator/s, whether good, bad, or wrong size, would not cause the pressure to be too high.
The accumulator/s only dampen pulses of fuel pressure out of the fuel pump, and hold fuel under pressure to keep the system under pressure after shutdown (to prevent vapor lock).
Excessive counter pressure (aka- control pressure) would be caused by a clogged or rusted-shut WUR (aka- control pressure regulator). -Or clogged lines to/from it.
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'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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Ozzie
Joined: 12 Mar 2005
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Location: Townsville, Qld. Australia
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| Posted: Tue Apr 14, 2009 1:38 pm Post subject: |
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The pressure relief valve in the CIS distributor is supposed to set the system pressure.
The control pressure is set by the WUR as smoothie said.
You need a CIS fuel pressure test set to check correct pressures.
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Porsche 924 1984 (UK import) NA
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Montego Black on black/red
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Adismo
Joined: 05 Oct 2008
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Location: Guatemala
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| Posted: Tue Apr 14, 2009 4:10 pm Post subject: |
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| Smoothie wrote: | If you have the single 20cc accumulator setup, upgrade to the single 40cc.
If you have the double 20cc setup and neither leaks, you can stay with what you have. -Or upgrade to the single 40cc as preventative maintenance if you like.
-But the accumulator/s, whether good, bad, or wrong size, would not cause the pressure to be too high.
The accumulator/s only dampen pulses of fuel pressure out of the fuel pump, and hold fuel under pressure to keep the system under pressure after shutdown (to prevent vapor lock).
Excessive counter pressure (aka- control pressure) would be caused by a clogged or rusted-shut WUR (aka- control pressure regulator). -Or clogged lines to/from it. |
 mmmm i gonna check the fuel distributor but mmm why the haynes manual say that you HAVE to change the accumulator if you changed the fuel distributor and replaced with 005??? thats my doubt
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Ozzie
Joined: 12 Mar 2005
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| Posted: Tue Apr 14, 2009 5:13 pm Post subject: |
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what page on the Haynes are you referring to?
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Montego Black on black/red
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Adismo
Joined: 05 Oct 2008
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| Posted: Fri May 01, 2009 4:02 am Post subject: |
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| Ozzie wrote: | | what page on the Haynes are you referring to? |
At Haynes manual pag 78 sec 6) "fuel suply units" i hope this may help
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Ozzie
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| Posted: Fri May 01, 2009 8:34 am Post subject: |
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I see your mix up.
Accumulators do not regulate fuel pressure.
This is done via the wur and the regulator in the fuel dissy.
The haynes also is not completely accurate or forthcoming with explanations. I would say the earlier part is NLA and you have to upgrade but why replace an operational unit when replacing the fuel dist is beyond me.
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Montego Black on black/red
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Adismo
Joined: 05 Oct 2008
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| Posted: Thu May 07, 2009 4:29 pm Post subject: |
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Ok i made a few test and when i start the car if i dont lift the sensor plate the car wont start for me i think the system has excesive pressure btw i have new bosh fuel pump, and i check the Wur and it seems ok i clean all the lines, oh and i change the shims at the fuel distributor was removed and is the same problem the car dont start  and i compare my old fuel dist and the new one and is not the same thing the 005 has a diferent i think that is call piston or some like that lol and the srew where you can change the shims at the fule dist (you called fuel dizzy) i slightly different i wanna know if someone did as the haynes manual said ??
BTW sorry my english
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Adismo
Joined: 05 Oct 2008
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| Posted: Thu May 07, 2009 4:41 pm Post subject: |
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right know i check all the hoses to see if leaked but were ok and my friend give me his fuel distr. and the car start and accelerate very well but in idle the car stop sooo mmmmmm what should i check 
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Ozzie
Joined: 12 Mar 2005
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| Posted: Thu May 07, 2009 5:02 pm Post subject: |
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You need to get a fuel pressure test unit to set the system pressure and check the control pressure.
My car doesnt have the shims (in a packet in my tool box though) and it works fine at idle.
Its not system pressure holding down the piston and air flap on the fuel dist.
Its control pressure- from the WUR.
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Its AUTO and its BLACK
Montego Black on black/red
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Ozzie
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| Posted: Thu May 07, 2009 5:04 pm Post subject: |
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No idle is usually idle set to low and/or incorrect air/fuel mixture.
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Its AUTO and its BLACK
Montego Black on black/red
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