throttle body porting - HCS Snowmobile Forums

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Old 05-07-2019, 05:41 PM   #1 (permalink)
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Default throttle body porting

i tried porting the throttle bodies on the 998. they arent real smooth as they taper down from the inlet to the outlet so i blended out the sharp steps and opened up both ends by 1mm.
on the flow bench, they went from 145 cfm at 15" to 157 cfm. that is per throttle body.
i'll be putting a set on the dyno soon for a direct comparison but i am pretty confident that it will add a small amount of power.
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Old 05-07-2019, 08:18 PM   #2 (permalink)
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Effects on the tune?
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Old 05-07-2019, 08:41 PM   #3 (permalink)
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Nice work.
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Old 05-07-2019, 08:57 PM   #4 (permalink)
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Effects on the tune?
Unknown as of right now, once i do a direct comparison on the dyno and look at AF, ill know more.
I will say though, that i doubt very much that the increase in airflow will be significant enough on its own to require any tune changes.

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Old 05-08-2019, 06:27 AM   #5 (permalink)
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So it looks like it's all smoothed out and widened after the butterfly so it doesn't leak air past at idle like a bad bore job on a set of carbs like back in the day.
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Old 05-08-2019, 07:57 AM   #6 (permalink)
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So it looks like it's all smoothed out and widened after the butterfly so it doesn't leak air past at idle like a bad bore job on a set of carbs like back in the day.
yep. i polished the area where the blades contact a tiny bit, but dont really remove material there, for that exact reason.
i'd like to do an actual over bore and use bigger throttle plates at some point, but this is a start.
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Old 05-11-2019, 06:46 PM   #7 (permalink)
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Any updates?
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Old 05-11-2019, 07:39 PM   #8 (permalink)
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Any updates?
No. I just got my summer test dummy in yesterday. Im going to get baselines done on tunes next week and then start trying parts.
I have the throttle bodies, several exhausts, external intake, our own adjustable billet wastegate actuator.
From there we'll be porting the head and finally it will get one of our cam kits.
Id also like to do a spark plug comparison, and test multiple engine oils.
All data will be shared on our Facebook page as i get it, and here when i get the chance.

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Old 05-12-2019, 08:53 AM   #9 (permalink)
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Well I don't have FB, but I'll be in touch and watching
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Old 05-16-2019, 09:27 AM   #10 (permalink)
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keep up the good work. You will be a hero if you can get an intake to divert air evenly to all cylinders.
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