Hi: Although new to this list, I've owned Bumble, our '77 RBB, Yellow with
black stripes (Bumble Bee?) since 1986. Bumble is in for some major
restoration at present. However, during her sojourn with us, we have redone
the engine. Bored 20 thou, flat top pistons, removal of pollution control
including cat, Vizard (sp.?) 3/4 race cam, double valve springs, head shaved
1/10 inch (approx. 10.0 : 1), and chromolley lifters. Twin HS4's. We did
not have any problem with valve clearance.
Rather lumpy at idle, but comes on the cam at 3,000, and pull strongly to
7,000. I haven't pushed it beyond that. No fuel cut-out like on the Miata.
Happy New Year, and Back to lurking.
Stuart Hellis
Edmonton, Alberta, CANADA
'77 MGB (Bumble)
'90 Miata (Tabasco)
'97 Intrepid Sport (Yanktank)
-----Original Message-----
From: Ken Roach <ken.roach@sk.sympatico.ca>
To: Chris Delling <saschris@flash.net>; mgs@autox.team.net
<mgs@autox.team.net>
Date: 1998-January-01 2:20 PM
Subject: Re:Piper Cam was: Chrome vs. Rubber
On Thu, 01 Jan 1998 14:09:50 -0500, Chris wrote:
>Once we're done thrashing your 64 (hopefully the doors don't fly open ;-)
>)then you can thrash my 77B, you might be a bit suprised. 9.0 to 1 CR,
>Piper Cam, re-curved distributor, no smog gear, and a Weber mixing the
>juice. No it's not how it was shipped from the factory, but it is as God
>(and Mowog) intended it!
>
Chris,
I would be interested hearing your experiences with this cam. I have
been thinking of using the Piper 270 in my rebuild, but I am
considered about tractability. Will this cam idle at 1000rpm or
below? Did you have any problems with clearance to the valve cut-outs
in the block? Some mag. articles have suggested that you have to
grind these cut outs to provide clearance with a higher lift cam while
others seem to ignore this point. I would appreciate opinions from
other listers who are using this cam as well.
Thanx,
Ken Roach
"74B
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