[T3] '72 FI into a '71

[Adriel Rowley]

Man Adney, I kept feeling your presence, but didn't see a letter, so kept on with my response. Amazing how powerful you are! ;p

I am almost certain I have all the parts for a C/D system, F.Y.I.. The harness is new, not sure who did it. No tags or markings.


Thank you so very much!
Adriel


-------------------------

1971 Sunroof Squareback with F.I. - In the Process of Being Dog Wgn 2
1985 Mercedes-Benz 300TD-T - Dog Wgn
Master's Student, A.S.U., living in north central Mesa, AZ


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> From: jadney at vwtype3.org
> To: type3 at vwtype3.org
> Date: Sun, 21 Sep 2014 17:10:18 -0500
> Subject: Re: [T3] '72 FI into a '71
>
> On 21 Sep 2014 at 13:37, Brandon Bacod wrote:
>
>> What pitfalls might one run in to trying to install a '72 FI engine into a
>> '71 which has apparently has had all of the FI harnesses stripped out?
>> Bought a '72 with seemingly all of the engine there. Fuel pump in unknown
>> condition, from what I can tell the decel valve and a bunch of relays are
>> all hooked up, but the PO had a long story of his tweaker friend goofing
>> off with it, and when it came to me it came without a generator, a couple
>> plug wires and coil, so obviously it wouldn't run. Now. How difficult will
>> it be to transplant all of the various relays/how essential are they? I've
>> sat down with my Bentley in an attempt to get it running, but certain wires
>> just don't seem to be diagrammed, and I don't want to sink a bunch of time
>> into it if it's a doomed swap.
>
> The '72 FI is an odd year, so this would only work if you swapped
> EVERYTHING in the engine compartment: brain, distributor, intake air
> distributor. Even the tranny is slightly different, with an extra
> switch on it, but you can ignore that and plumb the vacuum advance
> directly to the IAD, like all the other years.
>
> '71 is one of the best FI years, while '72 is one of the worst,
> simply from a tuneup/maintenance perspective. If you have any of the
> old '71 FI parts, I'd try to resurrect the '71 FI. Otherwise, look
> for a '68-71 donor car. I realize this will be hard if you aren't
> already familiar with our FI.
>
> FYI, the '71 and '72 FI wiring harnesses are different. You would
> need a harness from a '70 or '71 to work with the '71 FI.
>
>> Compression test shows ~125 lbs on 2,3,4 but only 40 on 1...
>
> 40 sounds so low that it makes me wonder if there's something simple
> wrong, like rust on a valve seat, a sticky valve, or .... It would be
> unusual for a #1 valve to burn, but it's not impossible.
>
> Pull off the rocker assy on that side and see if the head studs below
> #1 hold torque. They may be pulling out of the case, which would be a
> bad sign, but it's likely that there is a simple solution here.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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