I have a Petter PH1 on a dumper, rated at 6.8bhp @ 2000rpm.
I have just had it rebored +20, ground the valves in and fitted a new
injector nozzle (set at 800bar).
It has run about 5 hours since and is still a bit smoky, I pulled the
injector out this morn as the washer was leaking slightly and found
quite a lot of carbon built up on the nozzle (which I didn't touch).
With good compression and a new airfilter I can't see any other reason
for what must be an incomplete burn but injector.
So, is 800bar the correct pressure? should I try raising or lowering
the pressure?
Or is it that they are always smoky and as Jack Nicholson said "maybe
this is as good as it gets"
Kev

On Sun, 22 Jun 2008 04:35:01 -0700 (PDT), Kev  wrote:

>I have a Petter PH1 on a dumper, rated at 6.8bhp @ 2000rpm.
>I have just had it rebored +20, ground the valves in and fitted a new
>injector nozzle (set at 800bar).
>It has run about 5 hours since and is still a bit smoky, I pulled the
>injector out this morn as the washer was leaking slightly and found
>quite a lot of carbon built up on the nozzle (which I didn't touch).
>With good compression and a new airfilter I can't see any other reason
>for what must be an incomplete burn but injector.
>So, is 800bar the correct pressure? should I try raising or lowering
>the pressure?
>Or is it that they are always smoky and as Jack Nicholson said "maybe
>this is as good as it gets"
>Kev

800 bar sounds like you have got some wrong units in there, that's 11603psi

3150psi or 215 atmospheres is the correct pressure.

If the engine isn't getting up to temperature, then you'll get various problems
with the engine, especially ring seating.

Peter
--
Peter & Rita Forbes
Email: diesel@easynet.co.uk
http://www.oldengine.org/members/diesel
http://www.stationary-engine.co.uk
http://www.oldengine.co.uk

On Jun 22, 1:21 pm, Peter A Forbes  wrote:
> On Sun, 22 Jun 2008 04:35:01 -0700 (PDT), Kev  wrote:
> >I have a Petter PH1 on a dumper, rated at 6.8bhp @ 2000rpm.
> >I have just had it rebored , ground the valves in and fitted a new
> >injector nozzle (set at 800bar).
> >It has run about 5 hours since and is still a bit smoky, I pulled the
> >injector out this morn as the washer was leaking slightly and found
> >quite a lot of carbon built up on the nozzle (which I didn't touch).
> >With good compression and a new airfilter I can't see any other reason
> >for what must be an incomplete burn but injector.
> >So, is 800bar the correct pressure? should I try raising or lowering
> >the pressure?
> >Or is it that they are always smoky and as Jack Nicholson said "maybe
> >this is as good as it gets"
> >Kev
>
> 800 bar sounds like you have got some wrong units in there, that's 11603psi
>
> 3150psi or 215 atmospheres is the correct pressure.
>
> If the engine isn't getting up to temperature, then you'll get various problems
> with the engine, especially ring seating.
>
> Peter
> --
> Peter & Rita Forbes
> Email: die...@easynet.co.ukhttp://www.oldengine.org/members/dieselhttp://www.stationary-engine.co.ukhttp://www.oldengine.co.uk

800bar? DOH! - I meant 180bar.
So if it is set too low does that mean it will be injecting in too
early?
Kev

On Sun, 22 Jun 2008 05:50:10 -0700 (PDT), Kev  wrote:

>800bar? DOH! - I meant 180bar.
>So if it is set too low does that mean it will be injecting in too
>early?
>Kev

No, probably too late if anything, try getting the pressure up and see what it
is like.

Low pressure build-up will delay the onset of injection.

Peter
--
Peter & Rita Forbes
Email: diesel@easynet.co.uk
http://www.oldengine.org/members/diesel
http://www.stationary-engine.co.uk
http://www.oldengine.co.uk