RE: Still more hot air

["Lee, Ken" <ken.lee@domain.elided>]

John,

My current 1969 Euro GTV has a cylindrical air cleaner housing which runs
the length of the engine. The opening is on the engine side at the front. It
appears stock with nothing missing. The oval shaped opening points toward
the engine and is over the thermostat (more or less). My previous 69 GTV had
the 1600 style set up and I have not seen any other stock Weber set ups so I
was wondering if mine is stock?

Thanks.........Ken

		------------------------------
		Date: Thu, 15 Jul 1999 21:05:13 EDT
		From: JHertzman@domain.elided
		Subject: Still more hot air

		On the general question whether Alfas would benefit from
breathing air which 
		had not been preheated by the radiator, I believe the last
multi-carb Alfa 
		engine which breathed the general underhood atmosphere was
the 6C 2500 SS 
		which went out of production in 1951. The base single-carb
1900 and the 
		single-carb Giulietta used the underhood air, but I believe
that the 1900 TI, 
		Giulietta Veloce, 2600 Sprint and Spider, the single-carb
105 Giulia, and all 
		of the twin-carburetor (or injected) variants of the
1600-1750-2000 engines 
		had either ducted air or an air-cleaner "snorkel" drawing
from a suitable 
		hole off to the side of the radiator bulkhead, as do all of
the V-6s. I 
		believe this is the case with all of the boxer engines also,
although I have 
		no personal experience with them.

		Graham comes back to the question of how great is the power
increase 
		attributable to cool air induction? The difference in power
between a 
		Giulietta and a Giulietta Veloce was 10 hp, 12.5%, which is
attributable to a 
		combination of the cold ducted air, two Webers in place of
the single Solex, 
		7% higher compression (9.1 vs 8.5), 5% greater valve lift
and about 5% longer 
		duration. I would think that the Webers, the camshafts, and
the compression 
		ratio would get the lion's share of the credit.

		John H.

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