Blowers

[JHertzman@xxxxxxx]

Dana Loomis made the interesting suggestion to Gregory "Swop" Scott that he
abjure the T-Spark in favor of a 1.8 turbo from a 75:
>>This engine was a factory turbo installation based on the classic alloy Alfa
I-4, and as I recall delivered about 190 HP DIN, comparable to a 12-valve 3 l
V6.  The practical advantages, relative to any 155 motor, are that it is based
on the same block as the stock spider motor and was designed to be mounted
longitudinally.  It might be easier to mount than a T-spark from a 75, because
the block and head should be the same height as a standard 4, and the turbo
components can be relocated if they're in the way.  You'd still have to drill
the crank to take the transmission input shaft as brian noted, however.   They
didn't make a lot of 75 turbos, but a determined person should be able to find
a motor in a wrecking yard and have it shipped to wherever they need it.  This
is just a matter of time and money, there are no legal barriers to importing
an engine without a car<<<

I have paid no attention to Turbos, being philosophically predisposed to
natural aspiration, but could not help pulling out d-Amico-Tabucchi on this
one. My, but there are a slew of different Turbo Fours, from the Alfetta
Turbodelta through the 164. The only ones for which d'A-T gives production
quantities are the Alfetta Turbodelta (500) and the Nuova Giulietta 2.0
Turbodelta (342). The horsepower figure of 190 DIN which Dana gives is a bit
high, per the book; it gives 171 DIN for the ironblock 2 liter 164, 150 for
the 2 liter Alfetta Turbodelta, 170 for the 2 liter Nuova Giulietta
Turbodelta, 155 and 165 for two versions of the 1.8 75, (the 175 apparently
also the Fiat-based engine) and 280 for the Turbo Evoluzione (which Gregory is
unlikely to find down at APE, but one may dream.)

The book says "When the 75 began to be used in competition in 1986 a
turbocharger was introduced as previously seen on the Alfetta and Giulietta.
Alfa Romeo had always been reluctant to fit turbochargers to its production
models with the exception of its diesels. The car was fitted with a Garrett T3
Turbo equipped with a special cooling system", probably referring to an
intercooler. The installation actually seems to have little in common with the
two earlier ones; the Alfetta had a KKK blower, and both the Alfetta and
Giulietta seem to have had carbs instead of the Bosch system on the 75.

Personally, I would be very chary of the assumption that "the turbo components
can be relocated if they're in the way. The beauty of finding an Autodelta
Turbo in a boneyard would be that the rods and low-compression pistons would
be there already, and the convoluted exhaust system to fit a 116, but not 115,
chassis would already have been engineered. If waltzing in to reposition the
turbo and arrange a different intercooler and new exhaust manifolding I would
think it would be wiser to go to Jim Steck (or someone like him, if there IS
someone like him) who has been there, done that. 

John H.

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