02-09-2005, 06:40 PM
|
|
Registered User
|
|
Join Date: May 2003
Location: Sydney Australia
Posts: 3,577
|
|
 Quote:
|
Originally Posted by turbolarespider
I think I can partially answer it...
The reason that they didn't move the single plug off to the side was that this is a fairly slow burn engine. With the chamber shape, either you would burn really slowly, or it may cause knock if cylinder pressures are too high.
And this didn't make production until the 70s due to cost.
The twin plug fixes the above across the board.
I'm actually surprised that the current Hemi motor is a TS head. VERY expensige for the extra machining, plugs, wires, etc. For a mass produced engine, not very cheap.
Eric
|
Thus when they designed the TS head, thanks to changing the included valve angle they managed to flatten the combustion chamber. I do wonder how that head would work with a single plug? ... cheaper for us guys to convert our GTVs to the narrower valve angle, just plug the other hole!. Compare the combustion chamber to say a BMW 2002 head and reasonably similar and the BMW head works great with a single plug.
Thus they could have productionised a single plug version of the narrow valve angle head for the same money as the wide angle head ... but ofcourse they didn't so mute point 
Pete
__________________
ps: Remember it's all just opinions 
'71 1750 Series 2 GTV: http://www.alfabb.com/bb/forums/showthread.php?p=208078
|