Opinions on these Dyno Numbers
Road Captain
Joined: Jun 2009
Posts: 717
Likes: 1
From: Drexel Hill, Pa
I agree with you that your numbers are LOW. The average 88" stage 1 comes in at low 70's for HP and mid to high 70's for TQ. 60 HP is lower than stock, never mind a cammed up 95". I think they put your cams in retarded or some thing else is wrong. I don't believe your exhaust could create this much of a problem. You need to have the builder find out what's wrong and fix it. Just my 2cents.
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Road Captain
Joined: Aug 2005
Posts: 576
Likes: 1
From: Southern Maine
Thanks again for the replies. The build was done by harley mechanic in his home garage. the dyno was done at a dealer, so there was no real option to do the before dyno, unfortunately. Regarding what the dyno tuner said about advancing the timing...would that be necessary if the cam timing marks were lined up properly at install?
Grand HDF Member
Joined: May 2008
Posts: 4,624
Likes: 189
From: Newcastle, Ca.
I now understand your problem as you had two different guys do the work...
Some timing may be done while tuning, but when the cams are off a tooth, thats a problem. Its not hard to check them, I would do this first. Remove cam cover, possibly exhaust if its blocking the cam cover. Lift bike, remove the plugs and turn motor over til cam marks are lined up. Of they do not line up, they were installed incorrectly.
Google sumping. Basically the oil pump or o'rings were not installed correctly and the pump can not keep up with scavenging the crank case of oil. Their should be some oil, 4~6 oz's. The extra oil literally bogs down the bike, symptoms include low hp and tq.
Some timing may be done while tuning, but when the cams are off a tooth, thats a problem. Its not hard to check them, I would do this first. Remove cam cover, possibly exhaust if its blocking the cam cover. Lift bike, remove the plugs and turn motor over til cam marks are lined up. Of they do not line up, they were installed incorrectly.
Google sumping. Basically the oil pump or o'rings were not installed correctly and the pump can not keep up with scavenging the crank case of oil. Their should be some oil, 4~6 oz's. The extra oil literally bogs down the bike, symptoms include low hp and tq.
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Road Captain
Joined: Aug 2005
Posts: 576
Likes: 1
From: Southern Maine
Thanks for the info. I did a forum search for sumping and read some good posts. That does sound like what's going on. I spoke with the builder and he will take a look. I'm hoping it's one of those issues and I can get some respectable #'s after it's fixed. I find it hard to believe that the true duals alone could results in such low numbers vs 2 into 1 exhaust.
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Road Captain
Joined: Aug 2005
Posts: 576
Likes: 1
From: Southern Maine
Update...I just got back from a ride to get the oil up to temp, put my bike on the lift in a level position and did the check for sumping. Only got 3 oz of oil so it looks like that's not the issue. Besides that it doesn't feel like it's bogging down when riding.
This will probably turn out to be just an exhaust issue. If that's the case I'll live with it for now, to hell with the numbers. I'm still going to talk to the builder about checking the cam timing position to rule that out. Thanks again for all the ideas and info.
This will probably turn out to be just an exhaust issue. If that's the case I'll live with it for now, to hell with the numbers. I'm still going to talk to the builder about checking the cam timing position to rule that out. Thanks again for all the ideas and info.
Advanced
Joined: May 2006
Posts: 80
Likes: 0
Those stock numbers are mesured at the crank. The dyno shops use a chassis dyno that mesures power at the rear wheel. He's getting better numbers then stock. It would be nice if the tuner did a baseline run so you can see the improvement but most don't seem to do it unless you ask for it.
Just my 5cent opinion(I thought more about what I would write than my 2cents opinion).
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Road Captain
Joined: Aug 2005
Posts: 576
Likes: 1
From: Southern Maine
Here's an update. I checked it for sumping and it looked good. Brought it back to the builder and he checked the cams. Looks like the front cam was off by a tooth. He reinstalled and is trailering to the dealer to get it re-tuned. I'm keeping my fingers crossed that I get some respectable numbers. I'll post before and after sheets when I get them.
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Road Captain
Joined: Aug 2005
Posts: 576
Likes: 1
From: Southern Maine
New numbers:
76.85 hp 92.20 tq
That's more what I was expecting from what I've seen on the forum of other similar builds. I'm sure I could do even better with a good 2 into 1 exhaust, but for now I'll stick with the true duals. The builder was great about this. No cost to me for the fix or re-tune. I'll be picking it up tomorrow. I got a faxed copy of the dyno sheet but it is in mph instead of rpm's. I'm gonna get a reprint in rpm's and will post.
76.85 hp 92.20 tq
That's more what I was expecting from what I've seen on the forum of other similar builds. I'm sure I could do even better with a good 2 into 1 exhaust, but for now I'll stick with the true duals. The builder was great about this. No cost to me for the fix or re-tune. I'll be picking it up tomorrow. I got a faxed copy of the dyno sheet but it is in mph instead of rpm's. I'm gonna get a reprint in rpm's and will post.