Heads, blocks, and turbos

[Tony Hoffman]

They don't use the whole 20V NA because it's 10.5:1 compression, too high to
add a turbo to that design of engine.

Tony Hoffman


On 2/19/07, Huw Powell <audi at humanspeakers.com> wrote:
>
> > Fun, maybe, if you can get it to work. The problem with 10V to 20V
> > configurations is compression ratios. For instance, putting a naturally
> > aspirated 20V head on a JT yeilds about 6:1 compression.
>
> Right... the people putting 20v heads on 10v blocks are using the NF/NG
> block, which is a 10:1 engine, the 20v head drops it to what, 7.5-8 or
> so, which is where they want it.  I forget why they aren;t just using
> the whole 20v engine, but I suspect motorgeek.com (hope I got that
> right) would be the place to sneak a peak at their reasons.
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/
>