2.5l 5cyl via diesel crank and smaller bore

[Christo Atanasov]

I'm on final stage with my engine rebuild and already thinking of some
stupid options for another engine ;)
what about if I get crankshaft and connection rods from earlier CGT 1.9
5cyl.. it is 77.4 stroke (not sure), and then put them in some NG/NF blok.
It will become nearly 2.2, but with bigger bore/stroke ratio.. is this
reason to expect this engine to revs better and to higher rpms? Is it
possible to build this "Enginesteine" :))

----- Original Message -----
From: "Marc Swanson" <mswanson at sonitrol.net>
To: "John Cody Forbes" <john at craincorporated.com>
Cc: "Audifans Q-list" <quattro at audifans.com>
Sent: Thursday, September 11, 2003 4:05 PM
Subject: Re: 2.5l 5cyl via diesel crank and smaller bore


>
> > I was reading an article the other day (for the 40th time) about a
500+hp Dialynx 20v that used a diesel crank to bump up the stroke, then they
lowered the bore to get it to 2.5l. I was wondering about simmilar
combinations for my MC motors. Any BTDT with a diesel crank in an MC to get
some torque? I know of some diesel 5cyl cars arround that I can snag a crank
from, but what fits and what doesn't? Are there any OEM rods that go with
the combo to keep low compression, or do I have to go to Pauter/Carillo?
>
> Cody,
>
> My project for this winter is exactly that:  a 2.6L 20vt based on an MC
> block and a 7A head.
>
> On the crank, there are two basic VW cranks of interest:  one will give
> you 92.8mm stroke the other 95.5 mm.  The diesel crank you are referring
> to is from an industrial motor and has the 92.8mm stroke and also larger
> rod journals than the stock MC crank and the 95.5mm eurovan crank.  The
> problem with the larger rod journals is that you can't use MC connecting
> rods like you can with the 95.5mm eurovan crank.
>
> So in summary, my parts list:
> MC block, bored to 82.5mm and "clearanced" for the larger stroke
> (involves a bit of grinding)
> VW Eurovan 95.5mm crank
> MC connecting rods
> Custom pistons with higher-than-stock pin height
>
> resulting displacement should be = (3.14 * (8.25/2)^2 * 9.55 * 5) =
> 2551cc.
>
>
> I've already got the head and the block, just need to look around for a
> good deal on a crank and then I'll draw up the specs for the pistons
> that I'll need.
>
> Hope that helps.
>
> --
> -Marc
> 87' 4ktq
> 88' 90q
> www.mswanson.com/audi
>
>