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Wtb injector shims
mitch_04:
I'm looking for injector shims for my 82 1.6 NA Rabbit. I put new nozzles in and my pressure is 2300-2500, quite a bit above the 1800 spec.
ORCoaster:
If your pressure is higher than spec then you can carefully sand down the shim you have to make spec. I would suggest oil and a honing stone or some wet sand, sandpaper of 360 grit followed by more sanding with some 600. Others might tell you to go all the way to 3000 but I won't. Make figure eight designs to get an even face on them.
I just replaced all four nozzles on my 1.6 Caddy and I can really tell the difference in performance. I had the same amount of fuel in the jar from four nozzles as I did from ONE of the old pissers.
I had to adjust the turbopump to compensate for different fuelling afterward. But it runs and pulls so much smoother now that I kick myself for not thinking the nozzles were the problem long ago. 140 K on the engine and I thought the injectors were replaced when the PO rebuilt the engine. He spent 3600 on doing that, sent it all the way back to Ohio to have it done. Then he put the crappy injectors he removed back in it.
RustyCaddy:
Here are a couple of sources.
Have used these in VW style Bosch injectors:
https://mercedessource.com/store/search?keys=shims
Haven't purchased from these folks, but again, seems like shims for Bosch injectors in Mercedes and VW applications are pretty close to the same thing:
https://www.ebay.com/itm/203192731140?hash=item2f4f3b0604:g:3dMAAOSwVZxfuxZW
Not mine or anyone i know personally.
mitch_04:
Appreciate the responses! I considered sandi g them down, but was concerned with keeping them flat. Never thought to use a knife sharpening stone with some oil... Makes sense.
Would you all just balance them at the same PSI (2300) or drop all the way to spec (1800)?. I considered dropping them all to 2300 then running them for a season and checking again.
ORCoaster:
Spec on a 1.6 NA is 130 bar or 1886 psi. Are you sure you have the right bodies on the injectors and springs inside?
Almost sounds like you have 155 bar injectors.
If you can spring for the variable shim kit I think you will find it most helpful. There is a spec somewhere deep in my brain that equates a 0.5 mm to some value of Bar but I can't dig it out right now.
Having the ability to shim with various thicknesses will help you get as good of a balanced set of injectors as you can.
Then there is the method of changing the timing to compensate for the higher pressure. That can be tricky in that you really don't know how many mm to advance the timing to get those higher bar nozzles to go pop at TDC. Those of us that run turbos have the higher pressure injectors so we run more advance.
I see 95 mm in a lot of threads here and I think that is for the 1.6 and if a turbo 1.9 I believe it is 1.05. Not certain about those numbers but you can check me with the search on this site.
If it were me, being cheap and having three good ways to check the time on the engine I would install what you have and adjust timing to make it run its best and see how it goes.
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