Dyno charts
Tourer
Joined: May 2006
Posts: 458
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RE: Dyno charts
I've dyno'd mine a couple times, but didn't save the charts. Mine was making almost 90 HP/97 ft lbs on the best run, though. The engine has 12.5:1 compression Wiseco pistons, dual plugs, Chevy points, Accel coil, S&S Super E carb, Andrews Y cams, and heads ported, running Cycle Shack slip-ons on 1.75 inch pipes at the time. I tried drag pipes, but it ran like crap below 4000 rpm. They are really only good for top end performance. I was using a 50/50 mixture of 93 octane Sunoco gas and 100 octane low-lead AVGAS. She has almost as much pep as the XR750s I used to race. Of course, the XR only weighed about 300 lbs compared to the 425 lbs (I lightened it quite a bit) that the XLCH weighs.
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Elite HDF Member
Joined: Mar 2005
Posts: 4,092
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From: St. Petersburg Florida
RE: Dyno charts
Wow, is that with stock Bore and stroke?
ORIGINAL: Spectrexx
I've dyno'd mine a couple times, but didn't save the charts. Mine was making almost 90 HP/97 ft lbs on the best run, though. The engine has 12.5:1 compression Wiseco pistons, dual plugs, Chevy points, Accel coil, S&S Super E carb, Andrews Y cams, and heads ported, running Cycle Shack slip-ons on 1.75 inch pipes at the time. I tried drag pipes, but it ran like crap below 4000 rpm. They are really only good for top end performance. I was using a 50/50 mixture of 93 octane Sunoco gas and 100 octane low-lead AVGAS. She has almost as much pep as the XR750s I used to race. Of course, the XR only weighed about 300 lbs compared to the 425 lbs (I lightened it quite a bit) that the XLCH weighs.
I've dyno'd mine a couple times, but didn't save the charts. Mine was making almost 90 HP/97 ft lbs on the best run, though. The engine has 12.5:1 compression Wiseco pistons, dual plugs, Chevy points, Accel coil, S&S Super E carb, Andrews Y cams, and heads ported, running Cycle Shack slip-ons on 1.75 inch pipes at the time. I tried drag pipes, but it ran like crap below 4000 rpm. They are really only good for top end performance. I was using a 50/50 mixture of 93 octane Sunoco gas and 100 octane low-lead AVGAS. She has almost as much pep as the XR750s I used to race. Of course, the XR only weighed about 300 lbs compared to the 425 lbs (I lightened it quite a bit) that the XLCH weighs.
Tourer
Joined: May 2006
Posts: 458
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From:
RE: Dyno charts
No, the stroke was stock, but it was bored .060. Not enough to really make much of a difference in power.... I just did it to remove the scratches in the cylinders. I ended up replacing them a few years later, so it was back to stock bore. I didn't notice any loss in power (seat of the pants) when I did that.
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Elite HDF Member
Joined: Mar 2005
Posts: 4,092
Likes: 1
From: St. Petersburg Florida
RE: Dyno charts
Can it be run on pump gas with that compression ratio?
ORIGINAL: Spectrexx
I've dyno'd mine a couple times, but didn't save the charts. Mine was making almost 90 HP/97 ft lbs on the best run, though. The engine has 12.5:1 compression Wiseco pistons, dual plugs, Chevy points, Accel coil, S&S Super E carb, Andrews Y cams, and heads ported, running Cycle Shack slip-ons on 1.75 inch pipes at the time. I tried drag pipes, but it ran like crap below 4000 rpm. They are really only good for top end performance. I was using a 50/50 mixture of 93 octane Sunoco gas and 100 octane low-lead AVGAS. She has almost as much pep as the XR750s I used to race. Of course, the XR only weighed about 300 lbs compared to the 425 lbs (I lightened it quite a bit) that the XLCH weighs.
I've dyno'd mine a couple times, but didn't save the charts. Mine was making almost 90 HP/97 ft lbs on the best run, though. The engine has 12.5:1 compression Wiseco pistons, dual plugs, Chevy points, Accel coil, S&S Super E carb, Andrews Y cams, and heads ported, running Cycle Shack slip-ons on 1.75 inch pipes at the time. I tried drag pipes, but it ran like crap below 4000 rpm. They are really only good for top end performance. I was using a 50/50 mixture of 93 octane Sunoco gas and 100 octane low-lead AVGAS. She has almost as much pep as the XR750s I used to race. Of course, the XR only weighed about 300 lbs compared to the 425 lbs (I lightened it quite a bit) that the XLCH weighs.
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Tourer
Joined: May 2006
Posts: 458
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RE: Dyno charts
Not unless you retard the ignition so far that it won't run at all. 
I'd only run pump gas (93 octane) on CRs of less than 10.5:1, and even then you might need octane booster. In fact, I wouldn't build a street bike with a CR of more than that. My Sporty is mainly set up for racing. I don't usually run it on the street anymore since it's getting hard to get AVGAS. You might be able to find some racing fuel, though (for a lot more $$).
I'd only run pump gas (93 octane) on CRs of less than 10.5:1, and even then you might need octane booster. In fact, I wouldn't build a street bike with a CR of more than that. My Sporty is mainly set up for racing. I don't usually run it on the street anymore since it's getting hard to get AVGAS. You might be able to find some racing fuel, though (for a lot more $$).
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