[TR] use of overdrive

Randall tr3driver at ca.rr.com
Wed Aug 25 12:23:25 MDT 2010


> My OD
> was scavenged from a 1971 rust bucket TR6 but it is a banger not a
> slurrer so maybe it was still in the parts bin from the early ODs when
> the rust bucket was built.

More likely, IMO, it had been replaced or converted prior to your scavenging
it.  The change was implemented in 1965 for the TR4A IRS, so not likely
there were too many leftovers in the parts bin by 1971.

The conversion back to a "banger" is discussed in Healey circles as a
"performance upgrade"; and many of the earlier "slurrer" units can easily be
converted back to "bangers".

Converting the other way is sometimes done as well, in cases where the bore
of the accumulator is damaged.  Probably a good idea as well, in cases where
an earlier A-type is being installed in a car with IRS.

-- Randall 


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