I'm planning to build injection in an engine that originally uses two SU HS6 carbs. At first i planned to use the carbs themself as throttle bodies, but they're rather worn out, and they don't have throttle position sensors on them. Considering the vast amount of different throttle bodies out there, there must be one or more throttle bodies that fit a manifold that is meant for HS6 carbs.

HS6's have four mounting holes in a square, 54mm apart from each other. The bore of the carb is 45mm, but that doesn't matter that much. The original carbs have mounts between them and the manifold. The dimensions of that mount are displayed in the picture below, you can derive the dimensions from that drawing. The three holes around the carbs are to bolt this mount to the manifold. enter image description here Anyone who knows a throttle body that fits, or nearly fits these specs?

EDIT: This application is for a TR7 with 2L 4-cyl. (Info added by Pᴀᴜʟsᴛᴇʀ2)

  • Those are expensive carbs! I would bet your best approach would be to find a TB which is about the same bore and make an adapter plate to mount it. Just my SWAG, though. Jan 20, 2017 at 13:24
  • @Pᴀᴜʟsᴛᴇʀ2 Yes they are, they would need an also expensive rebuild anyway, so now is the moment to decide to go EFI or not. EFI will give a nice mpg and power boost i think, not to mention customisability. A TB with the same bore or sliightly bigger would be the best, but the most important thing for me is that it fits the manifold.
    – Bart
    Jan 20, 2017 at 13:32
  • @Pᴀᴜʟsᴛᴇʀ2 Yeah I also found that guy, but his site doesn't look like it's updated recently. I doubt he still sells his stuff, but i'll contact him. It's also rather vague what you actually get when you order the kit, if it works with HS6's, how it looks and everything.
    – Bart
    Jan 20, 2017 at 13:57
  • We should take this to the Pitstop to discuss. Jan 20, 2017 at 14:08

1 Answer 1


Which engine is this planned for? If it is the rover v8, then there is fuel injection already available from the later engines.

  • No, it's Triumph's own Slant 4. There's injection kits build for that also, but they include a complete manifold from the sprint engine. They're cost double their weight in gold though.
    – Bart
    Jan 23, 2017 at 7:13

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