Smooth bore elbow AFM to plenum

[stefan1200]

Hi all,

just ordered a silicone elbow from "autobahn88" (Hongkong based company) through a german dealer.

I went for the oversize 83 mm to compensate a bit for the air being forced through 90 deg. Is it advisable to insert a cone or something to adjust the 83 mm pipe to the 65 mm plenum intake to smoothen the airflow?

Thanks,
Stefan

[GreenV8S]

Isn't that too large at both ends? As long as the corner is smooth there's no great harm, so I suggest you concentrate on keeping the path smooth and avoiding edges or step changes at any of the joints.

[stefan1200]

It's 80 mm on the AFM and 72 mm outside on the plenum. The 83 mm value was quoted by mongoose on an earlier post. The "oversize" was also mentioned in other post, so I thought it might be a good start. I'm going to keep the path smooth at the joints then so as not to disturb the airflow too much.

Stefan

[spend]

Ream out the inside of the plenum throat to remove the step, not sure it makes much difference I just did it in a moment of contemplation a few years ago

Dave

[stefan1200]

Maybe I should worry less about improvements and go for a ride more often instead! :-)))))