[ale] Time for this Grey Beard to stir up some stuff

[Jim Kinney]

The 931 had a CIS that was vacuum driven. Brilliant engineering! Injection was in the intake manifold outside of each cylinder's intake valve. The same system could feed normal through turbo, and with a single metering piston change, through a dual turbo. 

But a vacuum leak in 30 year old hoses in a section not manufactured any more was a nightmare. Think diameter change over a right angle bend with a total length of 2" on the outside of the elbow. Engine was basically starving until the turbo kicked at 3k rpm and moved the air flow plate enough to get fuel to move. Leaving a full stop with the turbo screaming by popping the clutch _was_ fun :-) Probably cost me $200 in tire wear alone getting it home.

On May 27, 2021 2:26:20 PM EDT, James Taylor via Ale <ale at ale.org> wrote:
>I started out with a three cylinder Suzuki with three carbs and three
>sets of points.
>Later graduated to a v-12 Jag with four side-draft webers.
>Give me electronic fuel injection and one-to-one coils any day.
>Don't even get me started on BMW 2002tii mechanical fuel injection.
>-jt
>
> 
>
>James Taylor
>678-697-9420
>james.taylor at eastcobbgroup.com
>
>
>
>>>> Jim Kinney via Ale <ale at ale.org> 5/27/2021 12:39 PM >>> 
>If only it was the Porche with twin carbs! It was a 2L Fiat 131 that
>had EVERY gear head option except the fiberglass body with the roll
>cage
>and a turbo (they were crappy and burned up). That motor didn't redline
>until 9500 rpm and with the racing trans I could hit 60mph in first.
>Top
>speed was well north of 130mph. Broken speedo cable but passed a friend
>doing 120 like they were parked.
>
>Ah. Young and invincible (i.e. foolish!).
>
>On May 27, 2021 11:51:56 AM EDT, Sean Kilpatrick via Ale <ale at ale.org>
>wrote:
>>Jim,
>>I got my start on Porsches rebuilding A-coupes. You needed the trick
>>tool.
>>With it balancing the two carbs was a matter of a few minutes. 
>Without
>>it
>>. . . LOL!
>>
>>Sean
>>
>>On Thu, May 27, 2021 at 9:52 AM Jim Kinney via Ale <ale at ale.org>
>wrote:
>>
>>> My last carb car I worked on had dual twin Webber's. Keeping those
>>> balanced was a challenge.
>>> Don't miss it.
>>>
>>> The injection car I tinkered with had miles of vacuum hoses and
>>stranded
>>> the wife due to a leak.
>>> She was grinning the day that one was sold ('81 Porche 924 turbo -
>>aka the
>>> 931 - oodles of fun when it worked).
>>>
>>> On May 27, 2021 9:43:56 AM EDT, Jerald Sheets via Ale <ale at ale.org>
>>wrote:
>>>>
>>>>
>>>>
>>>> On May 27, 2021, at 9:21 AM, Solomon Peachy via Ale <ale at ale.org>
>>wrote:
>>>>>
>>>>>
>>>>> ObAnalogy: Do you miss carburated cars?  Having to check and
>adjust
>>>>> ignition points?  Hard starts in particularly hot, cold, humid,
>>and/or
>>>>> dry days?  A pinhole leak in half a mile of vacuum hoses causning
>>>>> stumbling under load, the inability to hold idle, or simply not
>>being
>>>>> able to start at all?
>>>>>
>>>>>
>>>> Bad analogy.  I have a carbuerated car that I adore working on.
>>>>
>>>> :-D
>>>>
>>>> —j
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>>>>
>>> --
>>> Computers amplify human error
>>> Super computers are really cool
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>
>-- 
>Computers amplify human error
>Super computers are really cool
>
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-- 
Computers amplify human error
Super computers are really cool
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