FWITW, There's a "How To Modify Your Nissan/Datsun OHC Engine" book, by
Frank Honsowetz, on eBay that ends today.
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=335200370
It's for the L-series, but sounds like interesting reading for roadster
folks. If you can't win the bid maybe it's still available elsewhere.
Fred
____________________ Reply Separator ____________________________
> Subject: Re: U20 Compression
> Author: "Kyle Hagemann" <kwhcpa@addler.net>
> Date: 5/23/2000 4:40 PM
>
> There's been a lot of information circulating re: higher
> compression... but what about lower? Suppose someone wanted to get
> his U20 down to 87 octane territory - with the SU cam.... what CR
> would that be? I'm guessing about 9.0:1 or so? What is the stock CR,
> 9.5, maybe more?
>
> From the L-series, I'm somewhat familiar with the concepts of valve
> unshrouding and chamber relieving... but specific "grind this much
> here" and "egad, man, don't grind there!" tips would be wonderful.
>
> It's been six months since I drove it, but AIR, it ran like a finicky
> high compression engine, and needed 92 octane.
>
> The engine is out now, and I will be pulling the head for a gasket
> replacement, as well as timing chain inspection; but I don't want to
> disassemble the short block.
>
> TIA for any suggestions!
>
> Kyle
> '69 2000 (??:1)
> '71 521 (9.5:1, more head work to come [ping-a-ling!]) '72 240Z (8:1,
> runs on anything;-)
>
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