130 bar injectors in a turbo engine?

[Kantdrivefast]

So I had to throw my mechanical lifter on my hydro block. The mechanical lifter engine ran great. Threw the turbo cam on it, but it has the smaller N/A injectors in it.

I also had to time the engine by taking an injector out and measuring when the engine was at tdc. Everything is as timed as I'm going to be able to get it, and it rolls over just fine. No binding or anything(verified with a ratchet, not the starter).

Sound like its good to go or does anything stand out as a potential disaster?

Cas

[saurkraut]

Read Mr. Vince Waldon's most excellent tutorial on timing:

http://vincewaldon.com/index.php?option=com_content&task=view&id=24&Itemid=28

Then consider the following on 130 bar injectors in a TD:

The only seals that see the higher pressure are the timing gauge plug and the part around that.  The rest of the pump is low pressure.

Andrew

there are a number of things to address in this thread.

1:  opening pressure does affect fuel economy, in this context
2:  Peak pressure in the compustion chambers will exceed opening
     pressure of the injector nozzle on the turbo motor with the 103 Bar
     Injector.
3:  This secondary injection is caused by the excessive pressure
     lifting the needle off it's seat and relieving the pressure in the
     injection line and therefore injecting a small amount of fuel after
     initial combustion takes place. This will cause poping and white smoke.
4:  yes this will also have the adverse affect of overheating the needle of
     the nozzle and contaminating it with carbon.
5:  there is never a steady stream of fuel being injected, it is a pulse
     only mili-seconds long.
6:  As the pump seeing this higher pressure are you asking if the pump
     can see the combustion gasses? if so then it is possible for the gasses
     to get into the injection lines but the delivery valve will stop it from
     going into the injection pump.  Except when the delivery valve has
     a bleed off cut out on the retraction coller or the delivery valve seat.

Hope this helps

Giles

anyone? Would i want turbo injectors?
ben

you don't really need them to operate, but vw upped the breaking pressure from 130 bar to 155 bar to "ensure safe fuel atomization"

As far as this goes, it is mandatory to turn up the pressures / switch to the turbo injectors for PROPER operation. That's not to "ensure safe fuel atomization" at all, it is to prevent SECONDARY injection. By cranking up the pressure, these injectors open when they're supposed to and close when they're supposed to, preventing unintended injection and making your machine actually work like it's supposed to.

It will run with NA injectors, but not ideally at all. (That info is from Giles more than me.  :wink: )

[jtanguay]

people have ran n/a injectors on turbo cars successfully.  of course if you're running 20 psi, the turbo injectors are probably a good idea. i seem to recall someone getting better mileage on the N/A injectors...

[jtanguay]

the "ensure safe fuel atomization" came straight from a VAG turbo diesel brochure i found.