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Tuning a B2134

posted by  West Coast 544 on  Tue May 22 23:36 CST 2012
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last visit: Sat Jul 21 11:32 CST 2012
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Right around the time the motor mounts beneath the B18 had disintegrated from years of petrol abuse (thank you felt main seals), the "project" returned from the machine shop. "Just a few more hours and I'll be burning rubber," I thought. Ha ha. Two weeks later...

So now my 544 has a B2134 (B20 with stock 80mm stroke and overbored to 92mm), with a reasonably well-ported B20F head, stock valves, Isky VV71 cam, Cometic Big Bore head gasket (.027" crush height), stock B18 distributor with Pertronix electronic ignition upgrade, rebuilt dual 44mm SU's, and uniform compression at 195psi.

And dieseling when I switch off the ignition.

Arrrgh.

I've quadruple-checked the timing (10 degrees BTDC) and mixture.

What am I missing?







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    Tuning a B2134

    posted by  james_a_sousa on  Wed May 23 18:20 CST 2012
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    last visit: Thu Oct 23 18:51 CST 2014
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    In the 60s, many cars had idle stops that dropped the idle below a setting that would allow an engine to run.

    When I tuned my brother-in law's Oldsmobile Cutlass, the idle stop was a solenoid that was about 1 inch in diameter and about 1-1/2 inches long with what looked like a 1/2 inch bolt protruding out the end,

    With the power on, you adjusted the idle, and when the power was turned off, the bolt retracted at least 1/4 of an inch, helping the engine to die.

    If you cannot find a happy medium, you should check some 60s cars for their throttle stop set-ups.
    --
    '96 855R,'64 PV544 driver, '67 P1800 basket case, '95 855, '95 854, the first three are mine, heh, heh, 485,000 miles put on 9 bricks








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    Tuning a B2134

    posted by  Chris Mullet on  Wed May 23 07:39 CST 2012
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    last visit: Fri Oct 24 09:08 CST 2014
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    If the idle is set too high it will run-on. Set it as low as you can. You could also try colder plugs, but once the ignition is shut I don't know how much that makes a difference anyway.

    At 195 psi compression, it sounds like you either milled the head or have some domed pistons. Are you running the highest octane you can find?








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      Tuning a B2134

      posted by  West Coast 544 on  Wed May 23 11:55 CST 2012
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      last visit: Sat Jul 21 11:32 CST 2012
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      Flat-tops for pistons, but the head is milled, although I do not know precisely how much, as the PO had some work done in the 80's. What I do know is that when looking at the combustion-chamber face of the head, held up next to a "hot" performance head, I have more of a "street" performance head.

      I turned down the idle, and viola, no dieseling. The only thing is she lopes a bit rough for my taste, so turning down the idle required some more fiddling with the carbs. This is made more difficult by the fact that she's not breathing as well as she should, as I've not yet installed the new exhaust system. Next stop...







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