Alfa Romeo Owners Club of Australia Forum

Technical => 160 Series (90, 75, 164 Sedans) => Topic started by: AlfaACT on November 26, 2010, 09:26:34 PM

Title: Alfa 75 engine identification ... ?
Post by: AlfaACT on November 26, 2010, 09:26:34 PM
Attached is a pic of a 75 engine bay.

Q1 2.5 or 3 litre?
Q2 L-Jetronic or Motronic?

How are they distinguished?

Thanks,
Peter.
Title: Re: Alfa 75 engine identification ... ?
Post by: AlfaACT on November 26, 2010, 10:41:32 PM
Thank you :-)
Title: Re: Alfa 75 engine identification ... ?
Post by: scott.venables on November 26, 2010, 11:20:58 PM
I think that's a Motronic.  The plug on the AFM looks narrower than the L-Jet cars and there's a wiring connector tied up with the sparkplug wires on the top of the cambelt cover for the crank angle sensor.

Scott
Title: Re: Alfa 75 engine identification ... ?
Post by: AlfaACT on November 27, 2010, 02:54:30 PM
I have attached another pic which hopefully might help confirm from visual identification?
I assumed that the casings of the ECUs would be different and therefore the identification easy - but not so it seems.

Otherwise, how can you tell definitively?
Sounds like the lid (black cap?) might need to come off - but what do we look for then?

Has anyone got a pic of a Motronic unit?

Peter.

PS The greenish tinge is NOT biological - its a feature of the graphics compression technology!
Title: Re: Alfa 75 engine identification ... ?
Post by: scott.venables on November 28, 2010, 12:58:48 PM
The extra connector on the cambelt cover I'm talking about is for the crank angle sensor, this reads a toothed wheel on the back of the crank pulley.  The L-jet cars don't have this.
Title: Re: Alfa 75 engine identification ... ?
Post by: VeeSix on November 28, 2010, 04:02:33 PM
This is a 3 litre Motronic
The 3 litre Motronic has a crank angle sensor and no wires going to the distributor  :)
Title: Re: Alfa 75 engine identification ... ?
Post by: bteoh on November 28, 2010, 08:00:11 PM
Wasn't the motronic only fitted to the Potenziatas? Normal 75 3.0L V6's still ran L jetronic?
Title: Re: Alfa 75 engine identification ... ?
Post by: VeeSix on December 02, 2010, 05:34:33 AM
Alfa ACT, is your 75 a Potenziata?
Does it have black seats or grey?
Certainly looks like a Potenziata engine bay to me  :)
Title: Re: Alfa 75 engine identification ... ?
Post by: ARQ164 Shane on December 02, 2010, 03:16:13 PM
hi ,
a mate , had a Potenziata and it had a return spring on the th/body ??
Title: Re: Alfa 75 engine identification ... ?
Post by: VeeSix on December 03, 2010, 06:40:01 AM
I have a Potenziata, no return spring on the throttle body, maybe someone added it from a GTV6  :)