Twin plug mod for 750GT

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Peter Tourin
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Twin plug mod for 750GT

Post by Peter Tourin » Tue Mar 28, 2006 5:31 pm

I'm rebuilding a 750GT that I picked up in December. It's got a 2nd plug in each head, on the opposite side from the original plug. The man who sold me the bike wasn't the one who had the 2nd plug installed, and couldn't tell me anything about it. Can anyone tell me anything about twin plug conversions, just to satisfy my curiosity?

Thanks - Peter Tourin
'73 Volvo 1800ES
'74 750GT

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BevHevSteve
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Post by BevHevSteve » Tue Mar 28, 2006 6:55 pm

this is an old racer trick some folks did in the 70s - more spark, faster combustion. Won;t really gain you anything for normal riding but it does look pretty cool
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Peter Tourin
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Post by Peter Tourin » Wed Mar 29, 2006 6:22 pm

That's more or less the way I see it -- I can't imagine that it'll do anything that I'll notice -- as long as it doesn't make things WORSE <bg>....
'73 Volvo 1800ES
'74 750GT

TONYDUCATI

Twin Plug Heads

Post by TONYDUCATI » Thu Jun 01, 2006 8:35 pm

As Steve says, faster combustion, so you can retard your ignition somewhat. I've taken them back about 8 degrees.

TONY.

cafe*racer
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Post by cafe*racer » Fri Aug 29, 2008 2:12 pm

Gives new meaning to the old saying "I need it like I need another hole in my head" :lol:

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Post by nottonight68 » Thu Oct 16, 2008 4:48 am

why then did ducati race bikes have twin plug heads

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Post by MartinMille BANNED » Thu Oct 16, 2008 5:43 am

Wasn't it to try to gain a complete fuel burn and like Steve said faster combustion, add to that larger carbs and flowed head ,,,,,,presto more power

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Somer Hooker
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Post by Somer Hooker » Fri Dec 12, 2008 6:46 pm

Dual plugs were used on singles back when. On a hemi head they are great as the piston crown on a bike tends to obscure the flame front,masking the fuel.
This became real big in the late 70's on BMWs when octane was reduced.You can retard them significantly and hence run a lower grade of fuel.

desmo127
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Post by desmo127 » Sun Aug 09, 2009 6:17 am

Syd Tunstall did a lot of singles back in the 70's. I don't know if he did trwins but I don't see any reason why not. He had a lot of special tooling for both and did a lot of engine development in those days.
Anything Worth Overdoing Is Worth Overdoing

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