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Injector burst pressure tuning on td27t


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#1 OFFLINE   kingcab

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Posted 31 August 2008 - 10:59 AM

How much can I turn up the burst pressure on the injectors any one know? :crossedwires: Have heard it would give a little more performance butt how much difference is it? Gonna put new nozzles in my injectors :rolleyes:

#2 OFFLINE   sw

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Posted 31 August 2008 - 02:14 PM

you add shims inside the injector body.

but without an injector burst pressure tester i would not go adding shims willy nilly.

Edited by sw, 31 August 2008 - 02:26 PM.


#3 OFFLINE   sw

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Posted 01 September 2008 - 12:34 AM

link

heres a link to the layout of a td42 injector
so i would think a td27 injector is just a bit smaller

again i think it would be unwise to start playing with the pressures without a pressure tester

#4 OFFLINE   kingcab

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Posted 01 September 2008 - 12:48 PM

link

heres a link to the layout of a td42 injector
so i would think a td27 injector is just a bit smaller

again i think it would be unwise to start playing with the pressures without a pressure tester



Damn did i say i would change the injector nozzles my self? :shiftyeyes: Allready got the layout on the injectors but thanks anyway :happy: according to my Factory workshop manual the burst pressure on the injectors should be from 103-112.8Bar so how much would be wise to go up from that?

#5 OFFLINE   sw

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Posted 01 September 2008 - 02:13 PM

no sweat, sorry for miss understanding you

i can only speculate about a figure but i have, a few times, seen 1600/1650 odd psi quoted, so 115-ish bar

Edited by sw, 01 September 2008 - 02:14 PM.


#6 OFFLINE   argo

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Posted 07 December 2008 - 08:34 PM

you have a service manual??

I'm trying to find the valve clearance spec for my 1991 TD27. please can you help me?

I would not exceed the recommended cracking pressure out of consideration for the injector springs and possibly retarding the timing of commencment of injection.

cheers,

mike

#7 OFFLINE   sw

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Posted 09 December 2008 - 02:03 PM

you have a service manual??


for a gu patrol, with td42

I'm trying to find the valve clearance spec for my 1991 TD27. please can you help me?

no, i only have the specs for a different engine in the family.
i might have a poke around and see if i can find anything.

I would not exceed the recommended cracking pressure out of consideration for the injector springs and possibly retarding the timing of commencment of injection.

why, i have never ever once heard of adverse affects of both raising opening pressure & advancing timing? - (within reason, obviously)

#8 OFFLINE   sw

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Posted 09 December 2008 - 02:07 PM

googled td27 valve clearance

got one answer at 14 thou exhaust & inlet. funny, same as the td42.
prehaps give that a try

Edited by sw, 09 December 2008 - 02:08 PM.


#9 OFFLINE   argo

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Posted 09 December 2008 - 08:34 PM

I googled it as well . the only result I found was "from memory they are .014.........."

It is quite likely correct, but I'm not at all keen on trying out something from someone's "memory" .Thanks all the same for the consideration. I am much more at ease with definite spec from genuine service literature. Hence my post[s] inquiring here.
If anyone happens to have a service manual for a Nissan TD27t, I would be delighted to hear from them.

As for cracking pressure,I don't believe exceeding any factory spec comes without a cost. Especially with regards to altering injection timing and it's effects on volumetric efficiency. Nissan spends millions of dollars on R&D in order find the best comprimise between longevity and performance.

Even with 18 years experience as a factory trained diesel mechanic, I'm not comfortable second guessing the engineers at Nissan and possibly shortening the service life of my machinery.

cheers,

Mike




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