[William Martin]

Interesting thought, I expect it is off the beaten path enough that you just have to try it & see. Keep the carb extra-rich until you know how much torque you are getting from the FY pipe. I expect it is a wide, as in non-peaky power band, which is good for an experiment. Not as likely to melt a piston as a peaky pipe! If you have an egt gage on your HPV, it will tell a lot about how to tune for that pipe.

Best of Luck,

Bill

[Brian Patterson]

There’s very little difference between the 2 and 3 pipe. If you run a shorter flex, you will get the same result. If you read the IKF rule book, it gives you all of the dimensions. The only difference is the volute. Use a 10-10.5″ flex and get the same result as a 3 pipe with a longer flex.

Check the rules section of Tri-C Karters or F100 karters for the direct flex length comparison.

[Caleb Gilbert]

Wow, thanks Brian for such an informational response. I actually received two HPV-2 pipes with the used engines I bought, so the flex change and the 2 pipe sound exactly like what I’m looking for.

[Anonymous]

Will +1 that the HPV2 pipe is very similar to the 3. I remember when we switched, could barely feel a difference.

[Author]

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