[Spridgets] 948/998 Heads

[Curt/Nancy Arndt]

Hi Bob,

Thanks for that, but I know I'll need to either deck the head or get flat
top or domed pistons to get the CR back to where it needs to be.  *I'm just
looking to find out if there is any advantage to the 12G206 head over the
12G295 one.*  Since this is a Concours car, I'm just looking at doing a few
things to pep it up slightly while retaining the original look externally.

After 40 years of working with Spridgets I know how to build a non original
looking, "cooking" engine.  But that's not where I'm going with this car.

BTW regarding the bigger carburetors, exhaust and cam.  I'll get all the
extra air flow I need from the better head, with the bigger valves, and
other head modifications.   The stock H1s (will some jet/needle mods) will
give me faster airflow (Bernoulli) versus more volume, which I really don't
need since I'm not going that overboard with this engine.  49 to 50 HP will
be fine.

Cheers,

Curt

On Thu, Mar 17, 2011 at 6:20 PM, Bob Van Kirk <racerbob70 at yahoo.com> wrote:

>   Curt and Nancy,
>    Going to the 295 head is a big improvement but one thing to consider is
> that the combustion chamber on the original Bugeye head is 24.5cc while the
> 295 head is 28.3cc thus lowering  your C/R unless the 998 pistons are flat
> tops.  Below is a URL to get charts for figuring yur C/R.
> csgnetwork.com/automotiveconverters    Scroll down to Engine Compression
> Ratio Calculator.  Just put in the numbers....
> I had a 998 engine with the flat top pistons and the 295 head in a Mini
> many years ago and up to about 60mph is was just about as fast as my 1275
> Cooper..
> Hope this helps,
> Bob
>
>
> --- On *Thu, 3/17/11, Curt/Nancy Arndt <cnaarndt at gmail.com>* wrote:
>
>
> From: Curt/Nancy Arndt <cnaarndt at gmail.com>
> Subject: [Spridgets] 948/998 Heads
> To: "Spridgets" <spridgets at autox.team.net>
> Date: Thursday, March 17, 2011, 6:15 PM
>
> Hi All,
>
> I'm collecting parts in preparation for rebuilding our original Bugeye 948
> engine.  I researched "Vizard's" book and I can  either put on a 12G295
> head
> or a rare 12G206 head, and yes I have both.  The engine will be balanced,
> new 998 pistons using the better head and stock H1 carbs with upgraded
> jets.  I'm just looking for a stock looking engine with a bit more HP.
>
> The question is... which is the better head, the 12G295 OR the rare 12G206?
> And why, or does it make a difference?
>
> Cheers,
>
> Curt & Nancy