VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: saurkraut on January 06, 2008, 11:54:15 am
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http://www.vwdiesel.net/phpBB/viewtopic.php?t=11948
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BUMP
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bump
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there is a dead line proposed! everyone on the list or who wants to get some shims should contact me or saurkraut! FEBURARY 1st. were looking at to get money the money in!
tanks Duane
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Can someone refresh my memory as to why we might need a selection of shims? are the pressures usually so far off as to not be abradeable? Do the springs wear out?
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Can someone refresh my memory as to why we might need a selection of shims? are the pressures usually so far off as to not be abradeable? Do the springs wear out?
it's all in your manual! this is for the DIY guys that have thier own equipment and like to rebuild thier own injectors! it's a must if you install new nozzels!
thanks Duane
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Just looked at my Haynes and it says that increasing a shim's thickness by 0.05mm increases break pressure by 5 atmospheres... I make that 73psi. Surely that's not accurate enough for balanced idling.
So abrading is surely the only way to go [speaking as a generally pretty handy DIYer :wink: ]
I can see everyone ending up with a pile of spare expensive washers which will never get used :shock:
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Marc,
your right! your not here to help! you are here to provoke!
thanks Duane
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Just looked at my Haynes and it says that increasing a shim's thickness by 0.05mm increases break pressure by 5 atmospheres... I make that 73psi. Surely that's not accurate enough for balanced idling.
So abrading is surely the only way to go [speaking as a generally pretty handy DIYer :wink: ]
I can see everyone ending up with a pile of spare expensive washers which will never get used :shock:
Generally you use the shim to get within 5 bar... and then abrade the spring to hone in.
Having a pile of shims makes it much much quicker to get within shooting distance within 1 disassembly/reassembly.
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Just looked at my Haynes and it says that increasing a shim's thickness by 0.05mm increases break pressure by 5 atmospheres... I make that 73psi. Surely that's not accurate enough for balanced idling.
So abrading is surely the only way to go [speaking as a generally pretty handy DIYer :wink: ]
I can see everyone ending up with a pile of spare expensive washers which will never get used :shock:
Generally you use the shim to get within 5 bar... and then abrade the spring to hone in.
Having a pile of shims makes it much much quicker to get within shooting distance within 1 disassembly/reassembly.
Thanks Vincent that explains it. So youre implying that injectors can be way off then, or is it just when they are new?
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New complete injectors supposedly come calibrated and are generally pretty close in my experience... although some will want to dial them in even closer.
Most of us DIY dudes just buy new nozzles and/or play with different nozzles in reused injector bodies. In this case the breaking pressure can be all over the map (just did some Merc nozzles and the breaking pressure when reassembled was 205 bar... puts the "pop" in "pop tester" !).
One other nuance... as injectors settle in and/or wear the pop pressure changes as well.
So, if you're gonna play with nozzles... a whack of shims is a handy thing indeed. 'Course, some of us need to get a life !! ;-)
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New complete injectors supposedly come calibrated and are generally pretty close in my experience... although some will want to dial them in even closer.
Most of us DIY dudes just buy new nozzles and/or play with different nozzles in reused injector bodies. In this case the breaking pressure can be all over the map (just did some Merc nozzles and the breaking pressure when reassembled was 205 bar... puts the "pop" in "pop tester" !).
One other nuance... as injectors settle in and/or wear the pop pressure changes as well.
So, if you're gonna play with nozzles... a whack of shims is a handy thing indeed. 'Course, some of us need to get a life !! ;-)
And finally...
assuming the injector is not spraying badly in the first place, how much improvement can one expect; (I'm not talking economy wise; more of an idling nature) how quiet can we get a diesel? I know granny's GTD is particularly quiet 8) Can we approach gasser dB's :?:
Do the shims wear down? My feeling is that they don't particularly as they are subject to changes in pressure on the spring but not the thumping of the injector nozzle seat.
And Finally ... finally :wink: What was the price per shim range? I couldn't quite understand that. :oops: There's a Lucas/Bosch place a few miles away I might drop in and get a UK price...
Regards
Mark
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What is the price of a bulk shim package?
How often do you rebuild injectors with new nozzles?
Prothe click on the link in the first post ! that will take you to where the prices are! if still not sure P.M. me and i will tell you more!
by the way Prothe i sent you a P.M. and you never read it a while back?
it should be still there?
thanks Duane