[T3] engine backfiring

[Dave Hall]

That's news too!  I learn something every day - mostly re-learn, but in this
case I haven't needed to know it anyway.

Dave.
UK VW Type 3&4 Club
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-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jim Adney
Sent: 01 August 2012 01:51
To: type3 at vwtype3.org
Subject: Re: [T3] engine backfiring

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.

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