Tri-Power TBI

[Gary Derian]

It seems to me that a tri-power TBI setup would work OK at WOT or center
unit only but getting a good fuel distribution during the transition would
be very difficult.  How is the ECM to know what the air flow distribution is
between the three TBIs?  A small change in throttle linkage would throw it
off.  If all 3 were the same size and worked together at all times, a
reasonable approximation would be to inject an equal amount of fuel into
each.

Gary Derian <gderian at cybergate.net>

>> >
>> > >I have a 65 tri power manifold that I was thinking about using for
EFI. It
>> > >has the small center carb and big outer carbs
>> >
>> > I hope it sounds as neat as the tri powers did!!! I think all they did
for
>> > the bigger center carb (same size as the end ones) was bore out the
>> > throttle holes larger for the center carb ('66 ??)
>> >
>> > SOMEBODY is making adapters that will get you from a Rochester base to
a
>> > Holley base (2 bbl). Have to search the memory banks!! :-)
>> >
>> tri powers had bigger end carbs and a small centre
>>
>> Clive
>Just like any 4 bbl - small primaries for good idle and low speed
>economy, BIG secondaries to tear the tires off when you mash it!!