So what do you consider a pass?

[K.H]

Just out of interest what do people consider a pass when doing a 3/27 or 10/90.
Clear.cloudy some dropout?

[Carrington]

With me it's 90/10 and has to be clear . Although I'm sure the truck runs better on a few M/D/T's

[Soupstone]

 My common rail can be twin tanked, so I'm normally happy with 10% unconverted after the second stage. Thats a 90/10, my results seem to have been better when I used to do a 3/27.

 Think the difference in accuracy between 3/27 or 10/90 has been mentioned before.


Nearly forgot, my wash waters normally still cloudy when I dry, but I only dry when theres no visible soap between the bio and water.

[Julian]

That's a really good question and one to which I'd like to know the official answer.

In almost 100 batches, I've only twice had what I'd consider a clear result, and I mean clear as in colourless.

The rest of the time I get clear but coloured results.

[K.H]

The "official" answer is anything but an instant clear is a fail!
A post on the VOD got me thinking about this,a guy said his result was cloudy-a good pass and was soon told it was a fail,so i was intrigued about other peoples opinions although i know peoples views will be dictated by the car it goes in

[Carrington]

Sorry I just realised my answer may be misleading when a day clear I mean not cloudy in any way but always colour , hope that clears things up

[Head Womble]

I concider a pass to be light pee colour, but not cloudy.
If I have a small amount of dropout (0.5ml in a 90/10) I'm happy to put it in my cars, but they'll both run on veg so it's no biggy.

[Tony]

Yes I'm with Mark, a pass is clear light yellow.  With cloudyness, if left long enough invariably it clears but with a little bit of dropout at the bottom.  That said, I'm happy to throw 10% unreacted into the car during the summer - it's only really winter that I want perfect passes to help with settling.

[Head Womble]

If / when I go back to water washing in the winter a clear pass would be needed.

[db]

I too consider a light yellow clear = a pass, but cloudy or even 0.25 drop out and I'll make that do.

Clear as in colourless?  didn't know it was possible, never heard of it.

[julianf]

Colourless is surely impossible?  Bio is not colourless, and all you are doing is dissolving it in something, not removing the colour.

Some bio turns out lighter colour than other batches - i guess a very light batch may seem colourless when diluted, but im certain it wont actually *be* colourless.


The word 'pass' is surly subjective?  100% is objective.

I would consider 100% to be a clear solution with no cloudiness and no drop-out.
I would consider a 'pass' to be different things at different times of year, and with different feedstocks.

In winter, id want 100% conversion, as with solid feed stock at any time of year. 
In the summer, with fluid feedstock, i wouldnt be that fussed (to the point of not bothering to test at the end of s2 at all)

[julesandtash]

I'm happy with this....

[Tony]

If you can see through it then that's a pass, as far as I'm concerned.  Colourless - not so sure about - non-opaque perhaps.

[nigelb]

A perfect pass is a clear 5/45. No haziness or dropout. My last batch was slightly hazy, which to me, was acceptable. I think we all have aspirations for the clear pass but we all know what will run in our own vehicles.

Both the Passat and the Golf we own will both run on veg so I don't tend to get too anal about it. If I owned something which was more fussy then I would put more effort in at the end of process in order to acheive perfection.

Nige

[Maurice_Mynah]

I agree with JulianF, It cannot be clear AND COLOURLESS as the colour of the bio going in MUST colour the whole test.
I process untill I obtain a clear golden 5/45, summer or winter. makes no difference as far as I'm concerned.