Pelican Parts Forums - 3.2 to 3.4 - must you go twin plug?

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- - 3.2 to 3.4 - must you go twin plug? (http://forums.pelicanparts.com/showthread.php?t=851793)

I feel like a drug addict hanging around other users and wondering why he can;t kick the habit. I will digest. The knock sensor sounds like a good idea. Twin plugging is tempting... but the madness needs to stop at some point.

If you recall my advice your rebuild project...establish your goal and keep it simple...
You do not need to have "the most" because getting there is a road full of pot holes.
your 84 with a nice and simple 3.2 to 3.4 conversion (98mm P&C 9.81 compression ratio and 964 cam) will offer you plenty of zip...and it is a proven formula...
my 2 cents...

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<div style="font-style:italic">So now the million dollar question: How is it done? Where does one drill? Is there a machining process i can provide to a local machinist? Buying the kits seems easy... But we have no local shops that do this kind of thing regularly, and sending heads to the us from rural eastern canada does not add up in my mind.</div>
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Many machine shops that have done this more than once have built jigs, and it's pretty much a no-brainer for them.<br>
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At least 3 guys on this board have done this themselves. Thought I had more.<br>
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<a href="http://forums.pelicanparts.com/911-engine-rebuilding-forum/584651-twin-plugging-using-14mm-plugs.html" target="_blank">Twin plugging using 14mm plugs</a><br>
<a href="http://forums.pelicanparts.com/911-engine-rebuilding-forum/171111-twin-plug-diy-2.html" target="_blank">Twin Plug DIY?</a><br>
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<div style="font-style:italic">I still can't get past the mental block of overtly modifying the design of the engine from original. Twin plug a 3.2 and is is just no longer the same, even if it is "better."</div>
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Sorry. Twin-plugging is "modifying", but slapping on a big-bore kit isn't? <img src="http://forums.pelicanparts.com/ultimate/biggrin.gif" border="0" alt="" title="Big Grin" class="inlineimg">

With the 3.4, everything looks the same from the outside of the engine. Plus, with new cylinders, it is reversable. Twin plugging, only reversable with new heads, and the mod is obvious when installed.

I have to chuckle at "diy articles" like the twin plugging above. The Mona Lisa was DIY i suppose, but not everyone can do it. In theory everyone can... But The level of skill around here is hugely variable. I know my limits. Drilling heads is not something you want to do for the first time. Kind of like brain surgery: "You are my first patient... But don't worry, i learned this on the internet."

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If you recall my advice your rebuild project...establish your goal and keep it simple...<br>
You do not need to have "the most" because getting there is a road full of pot holes.<br>
your 84 with a nice and simple 3.2 to 3.4 conversion (98mm P&C 9.81 compression ratio and 964 cam) will offer you plenty of zip...and it is a proven formula...<br>
my 2 cents...

This is the philosophy I'm going with as I'm collecting parts for my 3.0 to 3.2 build. A little more displacement, a little more compression, a little more cam, a better exhaust, combined with a little weight loss should make for a fun and reliable street car. Something in the neighborhood of 10.5 lbs/hp. About the same as the 3.2 Carrera Club Sport, which road tests of the day showed 0-60 in 5.3-5.5 sec and a 150 mph top speed. That would be plenty fast for me.