Steve,
Found your recommendation for changing injector tips(nozzles)
after 75,000 - 100,000 of interest. I have found that atomisation
degradation is increased when using SVO. I would expect that the
majority of diesel owners would not think to replace injectors until
they were having starting/performance problems.
I have a 1989 VW Golf mk.II I was given that had issues....
ticked over very rough. We guessed low compression. Still I decided to
pull an injector last week to see what they looked like. Didn't look
very bad (as far as carbon build up my Mercedes injectors were far worse
when I pulled them), but putting it on the tester showed some dodgy
spray. I replaced the full set with increased opening pressures (150
bar, standard should be 130) and low load/starting/tick over have
improved greatly - still sounds like one cylinder is slightly of kilter
at tick over - but one of the injector bodies is leaking, the sealing
surfaces need refacing where they have apparently eroded.
I'm interested in what you say about increasing injection
pressure for economy. I pumped up the pressure for improved
starting/operation with SVO (although I'm currently running biodiesel -
or when I can't get it diesel). The higher pressure should provide a
finer spray with the more viscous SVO. I'm going to fit the heaters,
thicker fuel line and afterglow plugs/relay soon.
Can you tell more about the improved efficiency with higher
pressures? I've not heard of this before and I have done a fair amount
of research into such things.
Best
Darren Hill
www.vegburner.co.uk
> -----Original Message-----
> From: Steve [mailto:[EMAIL PROTECTED]
> Sent: 30 April 2004 23:24
> To: biofuel@yahoogroups.com
> Subject: [biofuel] Re: 78 mercedes 300d
>
SNIP
> Change the injector tips. after 75000 to 100000 miles they dont
> atomize well. I often shim or have the injectors shimmed to a higher
> pop off pressure. Has been a while since I did this.. but seem like I
> increased the pressure 100 pounds over the original factory issue. It
> increases the fuel efficiency a 5-10%.
>
>
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