Frank,
We have not yet found a less expensive source for the heat shield - except a
Moss Distributor who might sell it to you for list less 10%.
As for the pistons, no problem using the 8.7:1 compression pistons unless
your cylinder head has been significantly shaved from its original depth
(see Moss catalog for this specification). We routinely use the high
compression pistons for the added power they give. No valves can come in
contact with them under any conditions, as far as we know. However, we did
build one engine with them which had a head that had been shaved more than
we had realized. It was remarkably powerful but would not stop pinging. We
found it had 185lbs. compression in each cylinder. We were able to reduce
that to 155lbs. by using two head gaskets. Still a strong engine but no more
pinging.
Cheers,
Lawrie
British Sportscar Center
-----Original Message-----
From: frank krajewski <frankk@intap.net>
To: MG List <mgs@autox.team.net>
Date: Saturday, February 02, 2002 5:30 PM
Subject: Parts Help
>I am rebuilding the motor in my 1980 MGB LE and started to make a parts
>list. I have two questions that some of you who have done the same might
>have experience with:
>1) The "heat shield" behind my ZS carb is( what's left of it) molded
>asbestos. Moss lists a replacement for $74.95. Can that be correct? Is
>there a more reasonable source or substitute replacement available? Mine
>is about 1/2 deteriorated and knowing the propensity of these carbs to
>catch fire from the cat right below I want to provide the best
>protection possible.
>2) Moss also lists 2 piston sets; one is the 8.0:1 compression ratio and
>the other is 8.7:1 compression ratio. They list for the same price
>($199.95). Can I use the higher compression pistons, I assume they are
>flat tops, without them interfering with the valves when they reach tdc?
>Has anyone used these 8.7:1 pistons in lieu of the stock 8.0:1 pistons?
>Are there any other problems associated with installing the higher
>compression pistons? Thanks for your time and, I hope, assistance!
>Frank "Swamp Yankee" Krajewski
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