Thanks to all for the "negative" feedback on overboring. I would much rather
find out the easy way than the hard way. I'm not looking for ultimate HP,
but, as no doubt most are, the most bang for the buck along with a noticable
improvement.
My impression after having read Vizard is that as long as you have lots of
money, a machine shop in your basement, or both, you can do almost anything
you want. The trouble is that some of the things he talks about are
obviously relatively low cost with good assurance of working as planned, and
it's not always clear where the difference is. I did guess that boring .120
over was one of the more expensive/higher risk endeavors, especially when I
found that the pistons alone are double or triple the price of "regular"
oversize pistons.
Well that's what the group is for, and again I thank you all.
<dnw>
1972 Midget waiting, but not ready, for Spring
1998 Safari
1999 9-3
1964 (Me)
----- Original Message -----
From "Gerard" <pixelsmith at gerardsgarage.com>
To: "David N Waldmann" <david@vermonthardwoods.com>;
<spridgets@autox.team.net>
Sent: Thursday, March 07, 2002 1:52 PM
Subject: Re: Piston and Cam questions, NOW with HP considerations
> David,
>
> The 1380 is done by offset boring the cylinders. To do this properly, you
> need a offset bore plate. It is a block of metal taller than the cylinder
> head that gets bolted to the block. It already gas the correct offsets
> positioned. I know one list member that had one made to build his engine,
> and do have it done right, you'll probably have this as an additional
> expense to the process.
>
> >From everything I've heard, 1380's have a lot of problems with blowby and
> require a lot of experimentation with multiple breathers to keep oil in
> the engine. I'm guessing that overheating in some cases may be an issue
> too. And what happens if you uncover a blemish in the cylinder wall in the
> process, or, as is possible, you end up opening into an oil gallery?
You'll
> need to start over with a new block. Some people have success with them
> eventually, but I think some wish they'd never gone down that path.
Anyway,
> I'm not an expert in the 1380 build process, but I know it's not for the
> faint hearted.
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