Diesel q's

[drew at scirocco.cs.uoguelph.ca (Drew MacPherson)]

On Sun, 30 May 2004, Julie Macfarlane wrote:

> It seems I made your day Drew  :) Now that I have had coffee, the concept 
> remains the same.
> The idea is to keep the lower block and replace everything else. the head, 
> injectors and fuel pressure system etc.

No... That's not the idea.  The bottom end of the 9A is not built for the 
stresses of diesel operation, and the pistons are definitely not up to the 
chore.  Diesels are always strokers - the fuel is slow burning, so there's 
no point in building a square or undersquare engine, or it will make no 
power at all.

> Is there a head that will fit the 9A? Or is the block just too "soft" to 
> take the bigger and harder injectors?

The injectors go into the head.  You could mount a 1.6 hydraulic head or a
1.9 head onto the 9A if you were so inclined.  Depending on piston
projection on the 9A, you may even have the right compression ratio to
make it work (around 23:1)  If you can accomodate the injection pump and
drive belt (the intermediate shaft on the 1.6/1.9 IDI diesel turns the
opposite direction and is run off the back of the timing belt) then you 
may even get the engine to start and run.

But once you load it up, you're going to bust something (ring lands, 
rings...)

Save yourself the grief and get a 1.9.

Drew

-- 

84 Wolfsburg Ed. Scirocco GTD     http://scirocco.cs.uoguelph.ca/gtd
89 Audi 200 Turbo Quattro Avant
94 A3 Golf GL TurboDiesel, 99 A3 Jetta GL TDI
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