[Mgs] Piston Dish

[Dodd, Kelvin]

Larry:

Typically the non sports car engines will have other differences such as
smaller valves and different camshaft specs.

Building the motor to MGA specs is not likely to affect anything that
the originality police will get upset about. Regular MGA pistons and
having the head machined to accept the larger MGA valves will make a
measurable difference even with the stock carburetion. You will want to
keep the camshaft on the torquey side. Aim for torque, not HP as you
have a heavier vehicle to get into movement.

I don't advise shaving the head to increase the CR as this will change
the valve train geometry requiring either new pushrods or silly spacers.

Kelvin Dodd



> -----Original Message-----
> From: mgs-bounces+doddk=mossmotors.com at autox.team.net
> [mailto:mgs-bounces+doddk=mossmotors.com at autox.team.net] On
> Behalf Of Larry Daniels
> Sent: Saturday, December 29, 2007 3:15 PM
> To: MG-MGB at yahoogroups.com; MG List; AustinGroup
> Subject: [Mgs] Piston Dish
>
> Gents,
>
> I've got a 1622 motor in my A60 Pickup.  The Driver's
> Handbook says it has
> 7.2:1 CR.  Can anyone tell me what size piston dish this
> would have?  16.2cc?
> How about combustion chamber volume?
>
> I'm considering what my options are for getting a little more
> pep out of the motor -- including bringing the CR up to
> probably 9:1.  I don't want to do anything irreversible to it
> and am wondering if it's feasible to shave my spare MGB head
> to get there or if I really need new pistons with a smaller
> dish along with a smaller skim.
>
> Thoughts?
>
> Larry