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marbles in my engine by arnold on 30 May, 2010 15:48
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Hello,
I have an audi 80 with an 1y eco engine,yesterday i installed a treu td pump and the 155 bar injectors.
The pump is modded with the gov mod,boost pin to max and max feul still original,1 bar turbo pressure;original intercooler and piping.
The power increase is truely INSANE as i never have been able to spin the tires and now i can make them spin till third gear,oke just a little bit
I found the engine to be a bit more loud and ratling,when i pusch it hard i can hear a loud rattle as the rpm's fall,sound like there's marbles in the engine,it also runs hotter.
i set the pump to 0,95,when i pul the cold start lever at idle i can hear the marble noise again.
The injectors have a good spray pattern but were a bit out of spec,around 140-145 bar.
I also noticed between shifts the rpm dont go down as fast as with the eco pump
Do i need to set the pump by ear or you guys think the injectors will advance the injection?,maybe i can have the injectors set to spec somwhere,will be expensive tough...
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#1 by burn_your_money on 30 May, 2010 17:39
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Try retarding the timing a bit.
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#2 by arnold on 04 Jun, 2010 15:18
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I adjusted the timing from 0.90 until 1.20
when i retard the timing it loses power and smokes more,when i advance it runs even louder...
Can the rattle come from a worn pump? it has a bit of shaft play and i can spin it easy by hand.
I pulled a late style td pump from another engine today and this one seems to be a lot stiffer,i will just try this one and rebuild the other pump.
anyone knows what wears in the pump so it makes it easy to spin by hand ? head springs maybe ?
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#3 by arnold on 05 Jun, 2010 11:45
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alright new pump,set it to exact 1.00mm
runs reaaaal smooth now no more marbles haha
i take it for a test drive and i cant do more then 2500 rpm it pulls really good and then it just stops,lots of white/grey smoke when it stops pulling
this pump is completly standard exept the boost pin has been set to the most agressive side
any thoughts ? -
#4 by arnold on 06 Jun, 2010 07:03
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i have located the problem,the new pump seems unable to suck the fuel in enough.
i bypassed the filter and let it run from a bottle and it didn't change anything i could see the fuel going back and fourth in the clear line along with some air.
I will fill the pump with atf and let it sit a couple of days,if this fails is there another way to make the vains inside come loose again ?
maybe blow in some pressured air or something i will try everything before opening the pump
ANY suggestions welcome ! -
#5 by burn_your_money on 06 Jun, 2010 07:07
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Feed the pump with a CIS fuel pump (70 psi or so). If you do this you NEED to hook up a pressure gauge to the pump internal pressure. I wouldn't go over 120 PSI.
You should actually hook the gauge up first to check to see what the internal pump pressure is. -
#6 by arnold on 06 Jun, 2010 10:24
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Feed the pump with a CIS fuel pump (70 psi or so). If you do this you NEED to hook up a pressure gauge to the pump internal pressure. I wouldn't go over 120 PSI.
You should actually hook the gauge up first to check to see what the internal pump pressure is.
Really thanks for the help burn,i will try this tomorow,would the high pressure make the vains come loose again or is the CIS pump just a replacement for the feed pump ?
I was wondering would it do any harm if i put some WD-40 in the pump to help things come loose ? -
#7 by burn_your_money on 06 Jun, 2010 11:44
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I don't think WD-40 is a good lubricant so it will likely do some damage.
The vanes are pressed outwards against the feed pump liner by centrifical force and internal pump pressure. By bumping the pressure up you may be able to free them up. You might want to pull the pressure regulator and make sure it's not siezed as well. Actually the pressure gauge before you hook the CIS pump up should tell you that. -
#8 by wolf_walker on 07 Jun, 2010 15:37
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a CIS pump? Seems like 70psi is asking for leaks, I thought we all decided low pressure pumps were ok to assist weak internal lift pumps? Didn't giles or somebody bench one and finally determine there was little to no effect on advance awhile ago?
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#9 by burn_your_money on 08 Jun, 2010 09:52
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The pump internal pressure normally exceeds 70 psi so it won't cause leaks IF you don't rev it up past 120 psi. If it leaks it was going to leak when you drove it anyways.
Yes Giles and I tested feeding a pump with 30 psi and there was NO effect on advance. Internal pump pressure did increase by 30 PSI throughout the range though. -
#10 by arnold on 08 Jun, 2010 14:04
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The pump will be opened and rebuild,i did put a max of 90 psi on the pump and it didn't help it run like it should be but the vanes are still stuck,i think there's some mad corrosion in there.
Then i went mad and sprayed a lof of wd 40 in the inlet,let it soak for 6 hours,didn't help...
I got my hands on a brand new pump of a vanagon,swapped the lda and will try this,it's new but sat sealed in a box for unnown years.