Tom Fremont Posted November 10, 2020 Report Share Posted November 10, 2020 If triple SUs or Strombergs would get it done why did TRIUMPH go with the LUCAS P.I.? If memory serves a version of the 2 liter six in a Michelotti prototype had triple SUs. 6206VC Tom Quote Link to post Share on other sites
Motorsport Mickey Posted November 10, 2020 Report Share Posted November 10, 2020 1 hour ago, Tom Fremont said: If triple SUs or Strombergs would get it done why did TRIUMPH go with the LUCAS P.I.? If memory serves a version of the 2 liter six in a Michelotti prototype had triple SUs. 6206VC Tom As a 4 cylinder man it's only what I heard but I was always told the PI helped the emissions and kept the camshaft under control, and of course being Lucas it was cheaper than alternatives. ? Mick Richards Quote Link to post Share on other sites
stuart Posted November 11, 2020 Report Share Posted November 11, 2020 12 hours ago, Motorsport Mickey said: As a 4 cylinder man it's only what I heard but I was always told the PI helped the emissions and kept the camshaft under control, and of course being Lucas it was cheaper than alternatives. ? Mick Richards But PI never went to the US back in the day as it wouldnt pass US emission laws. Stuart. Quote Link to post Share on other sites
Motorsport Mickey Posted November 11, 2020 Report Share Posted November 11, 2020 53 minutes ago, stuart said: But PI never went to the US back in the day as it wouldnt pass US emission laws. Stuart. Sorry Stuart , I forgot Tom was in the US, I was talking UK emissions. Mick Richards Quote Link to post Share on other sites
Tom Fremont Posted November 11, 2020 Report Share Posted November 11, 2020 (edited) Webers are pretty good with emissions; short of EFI they may get top ranking. I had a '79 FIAT here in the 'States with one and it didn't need a catalytic converter to comply with regulations where most everything else did. It was always the CP cam which wouldn't pass U.S. limits; the CR cam which was used in later emissions TR6 might have done better in that respect with Webers but the 9.5:1 c/r might have doomed it too. No point running 6 throttles with less than that! Tom Edited November 11, 2020 by Tom Fremont Quote Link to post Share on other sites
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