[T3] engine backfiring

[Jim Adney]

On 31 Jul 2012 at 23:37, Dave Hall wrote:

> The injectors are paired, and the pairs are identified by grey and black
> boots, so you can put them on the correct pairs of cylinders. The grey
> injectors fire together, then the black pair.

The colors show where to put them, but the 2 greys (or blacks) don't 
fire at the same time. 1 & 3 are the same color, but 1 & 4 squirt 
together.  

If you look at the firing order, 1432, it's clear that Bosch picked
cylinders that fire successively to get squirted together. Thus they 
grouped them like this (14)(32). It's unfortunate that they didn't 
choose this differently. If they had viewed the firing order as 4321, 
they could have grouped them like (43)(21) and this whole question 
would never have to come up.

I never thought of it this way before.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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