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
Read Mr. Vince Waldon's most excellent tutorial on timing:
http://vincewaldon.com/index.php?option=com_content&task=view&id=24&Itemid=28Then 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: )
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...
the "ensure safe fuel atomization" came straight from a VAG turbo diesel brochure i found.
