2.3 NF block with MC-1 head?

[JShadzi at aol.com]

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[ Picked text/plain from multipart/alternative ]
Good point Jason, though its all subject to level of significance,
theoritically as the quench area is compromised detonation increases and
flame propagation is compromised, not sure if I've ever seen a HG spacer
create more detonation than the original 10:1 comp, but the point is well
taken, also a big disadvantage to flat topping a dished piston to lower comp.

Javad

In a message dated 2/21/2003 10:21:12 AM Pacific Standard Time,
jason510 at att.net writes:

> One often overlooked consequense of using thicker head gasker/shim to reduce
> compression ratio  is the reduced effectiveness of the cylinder quench
> area. When you increase the distance between the cylinder at TDC and the
> overhanging "flat" area of the cylinder head, the "quench" or "squish" that
> produces an squirt of turbulance at TDC is largely lost. Cylinder head
> quench and the resulting turbulance geatly help to reduce detonation. By
> adding a gasket shim, you may actually produce a combustion chamber that is
> more prone to detonation, despite the lower compression ratio!
>  I would suggest that a better way to slightly lower compression ratio
> would be to smooth all sharp transitions around the valves and enlarge the
> combustion chambers of the cylinder head with a die grinder, also use a
> chemist burette and liquid to measure and then exactly equalize the volume
> of all the head chambers, so that they are all at exactly the same volume
> when you are done.
>
> Jason K  Gray
> Anchorage Alaska
>