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.
My intent of breathing comment was to say that improvements in the head,
exhaust, cam and carburation will yeild the greatest results for the least
money and probably (??) aggrivation.
Regarding the "one off" aspect of the cam, I would think you are right
there too.
Gerard
At 8:10 AM -0500 3/7/02, David N Waldmann wrote:
>Gerard,
>
>I don't disagree with you, since I have no experience, but I do have a
>question that has been lingering for some time now. What about boring .120
>over (73.5mm, 1380cc) in accordance with Vizard's recommendation as being
>one of the best components for more HP? Or have I misunderstood him? This is
>in agreement with your recommendation of increasing breathing, not only in
>direct proportion of the larger displacement, but DV also says that a hotter
>cam can be used and still be streetable. Has anyone here gone that route and
>how do they like the results?
>
>BTW, even at 73.5mm you still have one overbore left at 74mm, if the 73.5mm
>bore was offset when it was done.
>
>Regarding the cam, as I understand most of the aftermarket cams out there
>are reground stock ones. There may be a few ground from OEM blanks, and
>there are some billet ones (made from new steel). However, to have your cam
>reground is going to be a custom one-off job, and I can't imagine it would
>save any money over buying a production one. Of course, if you have produced
>your own design and want to have it ground (like Vizard does) by all means
>go ahead.
>
><dnw>
>1972 Midget, blowing smoke
>1998 Safari
>1999 9-3
>1964 (Me)
>I enjoy long walks. Especially when they are taken by people who annoy me.
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