Dyno question
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Grand HDF Member
Joined: Jan 2010
Posts: 3,512
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From: Vancouver BC
Dyno question
So I went to a new (to me) indy' the other day to see about getting some engine work done. As he's showing me a dyno tune being performed I see they've removed the A/C and have the cooling fan blowing at a 45 degree angle across the opening. Is this how a dyno is normally performed? I thought a dyno would be performed under 'riding conditions' with the air cleaner on. Is this done to improve the numbers on the dyno chart? Should I be suspicious?
Road Master
Joined: May 2009
Posts: 930
Likes: 4
From: Jacksonville, FL
I have seen several dynos done before, including my own, and have never seen them do it with the ac removed. I would be suspicious of this one. Probably trying to fudge the numbers to make his look better than everyone's else. I bet he uses the STD instead of SAE settings also
Road Warrior
Joined: Jun 2007
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From: Here
Road Master
Joined: May 2008
Posts: 803
Likes: 3
From: Collegeville, PA
If it was a carbed bike and he was doing jet changes he likely left the A/C off to make the jet swaps easier. You guys do remember that motorcycles did have carburetors back in the dark ages.
And the fans are the only way to keep the bike from overheating while it's sitting still on the dyno.
And the fans are the only way to keep the bike from overheating while it's sitting still on the dyno.
If it was a carbed bike and he was doing jet changes he likely left the A/C off to make the jet swaps easier. You guys do remember that motorcycles did have carburetors back in the dark ages.
And the fans are the only way to keep the bike from overheating while it's sitting still on the dyno.
And the fans are the only way to keep the bike from overheating while it's sitting still on the dyno.
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Road Warrior
Joined: Feb 2007
Posts: 1,730
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From: Vancouver BC
So I went to a new (to me) indy' the other day to see about getting some engine work done. As he's showing me a dyno tune being performed I see they've removed the A/C and have the cooling fan blowing at a 45 degree angle across the opening. Is this how a dyno is normally performed? I thought a dyno would be performed under 'riding conditions' with the air cleaner on. Is this done to improve the numbers on the dyno chart? Should I be suspicious?
