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B20 rebuild 140-160 1969

posted by  JohnH on  Sun Apr 6 11:17 CST 2003
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last visit: Mon Oct 6 00:29 CST 2014
[RELATED]

Hi,

I've jsut finished a950 km TSD rally in the 1973 142 I bought a month ago (and spent lots of time on in the meantime!). All ran well, handling was great, the only problem was a hole in the radiator, which we patched up by crimping down the offending crosstube, and tossing in a jar of that offending goop that clogs everything up.
Anyway, the old engine is blowing some blue smoke on overrun (valves) and a bit on hard acceleration (rings, I guess) so a good excuse to get some more grunt.
From everything I've read on this site, 150hp ought to be a reasonable target without breaking the bank.
I want a strong, reliable engine, rev limit about 6k, with good torque rather than outright hp. A 'fast road' engine. So tell me what I need: my initial thoughts run to VV71 cam (or is there something better?), steel timing gear, clean up the head to E specs or better and match the ports, compression about 10:1 to run on the 95/96octain PULP we get in Australia. Everything balanced. Will the Stroms or SUs be sufficient, or will I need to go to Webers/Dellortos to feed enough fuel? I've already got the dual down pipe, feeding into a 2 1/4" just after the pipes come together, with a single muffler where the resonator use to be (across after the axle). Not too noisy, with a nice note.
What else should I do?

JohnH






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