Aneroid Pins - page 1 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Aneroid Pins by DonGTI on 31 Mar, 2008 01:03
• I had previously bought a 1.6 td aneroid pin to fit in my aaz however i've been browsing in the forum and found quite a number of other pins you people use, ranging from cummins to rover.  
  
  I am using my car as a daily driver in a country where there are few long stretches of road.  At present with the AAZ in standard trim it is pulling out 42-47 mpg, however it does so with relatively gutless performance  would a larger/better aneroid pin maintain fuel economy or plumb it down the drain?
  
  Which one should I go for?  The diesel pump service shop i bought the 1.6 td pin from said he would replace it with any other model i would like... but which one?  
  
  Thanks
• #1 by dieselweasel on 31 Mar, 2008 05:07
• Swapping the boost pin shouldn't negatively affect fuel economy...unless you start driving it harder.
  
  The 1.6 boost pin seems to be as good as any other from what I've read.  Also it is adjustable...the profile changes as it is rotated.
  
  Besides, if for some reason you decide you don't like it just undo the four screws on the LDA cover, remove cover, change pin, then reassemble.  Easy as pie.
• #2 by DonGTI on 31 Mar, 2008 05:16
• Thanks
  
  Can I use second hand ones or they have to be new?
• #3 by bert on 31 Mar, 2008 14:42
• Don,use a second hand one,my AAZ has a larger diameter pin than the 1.6 so i couldnt interchange them,i got the rover 220TD pin and its perfect,it has the most aggressive profile that will physically fit on the pin,my AAz flies with it in,its staying,no need to change that again.
  Bert
• #4 by James8485 on 31 Mar, 2008 14:46
• i have a AAZ also and was going to the local junker in a couple to pick up a 1.6TD pin it wont fit you say?? or not fit in some pumps> how your fuel econemy now??
• #5 by bert on 31 Mar, 2008 14:57
• my pump was brand new a year ago,i took the standard useless pin out,took my old scrap 1.6 pump to bits for the pin,but when i fitted the 1.6 pin to the 1.9 pump it was about 1.5mm smaller and wobbled all over the place,the 1.9 pin wouldnt fit the 1.6 pump obviously as it was too big a diameter,so i went scrap yarding and found the rover 220TD pin,absolutley amazing performance with a T3 turbo,winds up quick too,the spring under the pin is standard, and there is no smoke screw or starwheel to adjust on the AAZ pump i have,i have not touched the fuel screw on the back of the pump its still sealed with the tamperproof cap,and theres NO SMOKE at all,im well impressed,im running 11 psi max so far,i have no intercooler either.
  Bert
  
  And the rover pin does not alter as its rotated so it can be fitted anyhow  :wink:
• #6 by James8485 on 31 Mar, 2008 15:30
• CAN YOU ONLY FIND A ROVER 200TD PIN IN THE U.S?
  i am from canada and havnt even heard of this vehical!
  
  so many therorys! i was going to put the 1.6TD pin in now im stuck..
  i have a K24 turbo going on soon so i need a decicion fast >>>> OH 1 more thing even if i change the pin and still leave the small stock turbo for alittle bit whats going to happen? will i still be able to drive it ok>
• #7 by jimfoo on 31 Mar, 2008 18:29
• A Cummins pin fit in my AAZ pump. I thing it is also ground a bit deeper then the 1.6 pin.
• #8 by jimfoo on 31 Mar, 2008 18:33
• Oh, just remembered an important bit. If you put a different pin in, put in a different spring as well. Otherwise the pin will go to full fuel with only 4 PSI. I put the Cummins spring in, and calculated it will give full fuel somewhere around 11 PSI. Otherwise you will probably be smoking all the time.
• #9 by DonGTI on 31 Mar, 2008 21:32
• different spring as in i use a spring from the pump i removed the pin from? i.e. if i put a 1.6 td pin i use the 1.6 td spring and the same for the rover one?
  
  how much different is the cummins from 1.6? earlyer increase in fuelling?
• #10 by jimfoo on 31 Mar, 2008 22:34
• Quote from: "DonGTI"

  different spring as in i use a spring from the pump i removed the pin from? i.e. if i put a 1.6 td pin i use the 1.6 td spring and the same for the rover one?

  Yes. Probably any other spring will work with any other pin. The AAZ spring is just very weak as there was no need for a stiff one with a straight pin.
  
  
  

  Quote from: "DonGTI"

  how much different is the cummins from 1.6? earlyer increase in fuelling?

  I haven't seen them side by side but from the pictures, the Cummins looks ground more.
  
  Cummins pin and spring compared to AAZ pin and spring. Although it is shorter, the Cummins spring will work as it is stiffer. I had to open up the bottom just a tiny bit so it would fit over the steel spring seat.
  
  
  1.6 pin. You can see that it looks wider than the Cummins pin at it's smallest diameter.
• #11 by DonGTI on 01 Apr, 2008 05:29
• Thanks Jimfoo, however I have to ask what James8485 asked... if I keep my stock turbo (K03 003) do I risk doing any damage with a better boost pin?
  
  I'm really divided between the cummins and the rover pin... I went to the diesel pump shop and he said that he has rover 220 boost pins in stock however i have to specify which cummins boost pin i would require, so jimfoo can you tell me what engine yours came from as well as pump type?
  
  Also... which one has the best profile for a stock turboed aaz? nothing off the wall or something that drains my tank every time i floor the pedal...
• #12 by lord_verminaard on 01 Apr, 2008 06:14
• ...You could always grind down the AAZ pin and make it look like the 1.6 one.  Shouldn't be that hard...  
  
  Brendan
• #13 by jimfoo on 01 Apr, 2008 07:24
• I have no idea what my pin came off. The guy just had it sitting around the shop.
• #14 by DonGTI on 01 Apr, 2008 10:58
• The pump shop had 13 different boost pins for cummins 4 cylinder engines... so I guess i can't go the cummins route over to the dilemma between rover 220 and the 1.6 td...
  
  regards the spring i got a 1.6 td spring running around... can i use that with the rover pin?
  
  what spring did you use bert?