Oh yeah, head work time
Road Captain
Joined: May 2014
Posts: 555
Likes: 39
From: France
looks like the bike will be fun to ride :
peak torque at 3500, just in the good riding zone for a Dyna, and pull like crazy after 5000, in the fun area
btw, with hi perf valve springs you may be able to set the rev limiter to 6500 and see the top of that HP Climb ??
peak torque at 3500, just in the good riding zone for a Dyna, and pull like crazy after 5000, in the fun area
btw, with hi perf valve springs you may be able to set the rev limiter to 6500 and see the top of that HP Climb ??
Thread Starter
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Outstanding HDF Member
Joined: May 2014
Posts: 3,410
Likes: 143
From: Palm Desert,CA
No regrets on the cam change, if nothing else it feels like it pulls a little more cleanly, plus I was itching to get back into the cam chest for a second time. I wish I had friends with Harley's just so I could keep working on them. I learn so much the first time around 😃
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Outstanding HDF Member
Joined: May 2014
Posts: 3,410
Likes: 143
From: Palm Desert,CA
Thanks!
Road Warrior
Joined: Jun 2010
Posts: 1,368
Likes: 27
From: Australia
yeah when you open up these motors you soon realise they are just an internal combustion engine, very easy to work on, they have pistons, rings, gaskets, spark plugs, valves etc, the manual from Harley and parts back-up is pretty good
the interesting part of engine building/dynamics is how you increase your HP by 25 yet TQ has remained the same from your previous dyno run
with the dyno reading TQ and then giving a HP number, I think it becomes a time factor (ie.how fast the drum spins up)?
the interesting part of engine building/dynamics is how you increase your HP by 25 yet TQ has remained the same from your previous dyno run
with the dyno reading TQ and then giving a HP number, I think it becomes a time factor (ie.how fast the drum spins up)?
Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 439
From: florida
I hope a forum tuner or builder chimes in here because I'm scratching my head on this one.
I don't want to break up the good vibes because I know how labor intensive, costly, and exciting these builds can get but how can this result be acceptable? In all honesty we do ride dyno charts....if you rode off on a 120 tq bike, you'd say holy sh*t ***** that bike pulls comparatively.
I have to think either the bike was de-tuned or the compression is so low for that cam that torque has suffered. In no way is the pipe the problem here. I think this is a 103 ci right? So with this combo there should be 110-115 tq at least, the hp at 105 is still really low and the hp over 5k rpm forget about it (nobody really ever rides there but the rare time), someone said rev limiter up it to 7k....that's just silly talk for a harley. I'm looking at your hp at 4000 rpm at low 70's thinking this is absolutely not right.
So de-tuned? Low low compression? Or just the combo of parts just not a good match? Sorry but I think yes it must ride nicer all around but once the novelty wears off a bit I think you might rethink things.
I don't want to break up the good vibes because I know how labor intensive, costly, and exciting these builds can get but how can this result be acceptable? In all honesty we do ride dyno charts....if you rode off on a 120 tq bike, you'd say holy sh*t ***** that bike pulls comparatively.
I have to think either the bike was de-tuned or the compression is so low for that cam that torque has suffered. In no way is the pipe the problem here. I think this is a 103 ci right? So with this combo there should be 110-115 tq at least, the hp at 105 is still really low and the hp over 5k rpm forget about it (nobody really ever rides there but the rare time), someone said rev limiter up it to 7k....that's just silly talk for a harley. I'm looking at your hp at 4000 rpm at low 70's thinking this is absolutely not right.
So de-tuned? Low low compression? Or just the combo of parts just not a good match? Sorry but I think yes it must ride nicer all around but once the novelty wears off a bit I think you might rethink things.
Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 439
From: florida
And I want to add that if your static comp is 10.5 or little less than that, 10.3 for example then if you put the 57h back in and re tuned you would probably be amazed at the increased torque and better hp through the range. Only if it starts to weigh on you, if not then happy trails and enjoy it 100%. But I suspect that cam could be the issue at the psi you're at, check that psi.
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Outstanding HDF Member
Joined: May 2014
Posts: 3,410
Likes: 143
From: Palm Desert,CA
Thanks so much. Yes it's a 103" When you say psi you mean do a static compression test? I think there were others with the same cams that did well with TQ and HP so that's why I and the tuner were thinking pipe. I have 20 discs and closed end cap right now.
Too late for the 57's, already gone lol!
Maybe I just found my next project and it'll involve the comp...
Too late for the 57's, already gone lol!
Maybe I just found my next project and it'll involve the comp...
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Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 439
From: florida
The compression test is measured in psi, take it when engine is cold for better accuracy in respect to how your build worked out. The static 10.5 is never "seen" by the motor, it's just a calculation based on the parts, corrected compression is the true number and the psi test will offer you the best assurance that the build went right and each cylinder is running properly.
The supertrap is supposed to be a great tq pipe and the tuner hopefully was pulling disks until the tq line started shifting to the right, then he should have added 1-2 disks back to hit the sweet spot. Just start on the compression test and post the numbers up, that's the first and easiest place to start.
The supertrap is supposed to be a great tq pipe and the tuner hopefully was pulling disks until the tq line started shifting to the right, then he should have added 1-2 disks back to hit the sweet spot. Just start on the compression test and post the numbers up, that's the first and easiest place to start.