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Re: [T3] carbs v FI


On 27 Dec 2001, at 17:46, ralph wrote:

>     Cheap was my goal.  Problem with the FI distrib was that the
> vacuum advance was rotted.  I scrounged up something close out of
> my son's bin of old VW stuff.  VW/Bosch don't put part numbers on
> these, so I have no idea whether I could order the right one (but
> admittedly, haven't tried). Appeared to be the same travel by
> pushing on both, but there was really no way to mic it.  Anyhow, it
> seemed to run it just fine - but given that it was off a scrapped
> part, I don't know how long that'll last. 

The 3 digits stamped on the vac can arm are the last 3 digits of the 
Bosch part #. Any Bosch dealer can get you the part. I stock most 
of them. Yours is probably a 265 or a 505; I stock both.

>     Somebody once told me that an 009 was retarded a bit on the
> left bank to keep those cylinders cooler under the oil cooler. 
> Fact or just hype? Strikes me as a power robber. And a great way to
> imbalance an engine. I didn't believe it, but it sounds like you
> might know, fer sure. 

This really isn't clear anymore. The old dists may have been done 
this way, but I don't think any of the new ones are. The old 009s 
were a popular item, which had been cheapened to make it readily 
available for the major part of the aftermarket who has no idea 
whether things are working the way they should or not.

If you compare the advance curves of the stock FI dist with the 009 
you will find that it is better, the vacuum advance is just a bonus 
which gives better fuel economy at cruising speed, but it has to be 
matched up with the proper vacuum pickoff in order to work. It won't 
work with most carbs, so a dead canister is no problem.

-
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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