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Looks like that piston has some cut out for some extra lift? You should do a video on your install.
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The increase in static compression from the piston is often needed on more aggressive cam profiles to actually make up for the loss in dynamic compression caused by the increase in overlap or lobe center changes from said performance cam profile. If you ever get bored, take a look at some cam offerings for the automotive world and take notice of the recommended compression ratios. Get too aggressive without enough compression behind it and you can actually suffer from some fairly steep performance losses.
I am familiar with the cam that Jerry is waiting to come in. Surprisingly it has the least increase in duration of all of the cam offerings out there, but it has a healthy increase in valve lift, and the intake and exhaust lobe centerlines were moved which gives it a tighter LSA, and thus more overlap despite the lack of total duration. It's a good combo with that 11:1 compression. Should have some really strong mid range, not lose too much down low, but it will start to wake up past 5k, be a beast from 6500rpm onward, and pull strong past 9000rpm. Torque will likely peak somewhere around 7000rpm, but be fairly strong between 5000 an 8000. With port work this combination should be able to crank out low to mid 20hp figures. |
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I bought the Athena 233cc big bore kit with the 67mm piston and claimed 11.9:1 compression although it’s really a true 11:1 that can be used in 93 octane pump gas. I will install the kit along with a cam over the winter. I’m currently leaning towards the Terry Miller 2.5 ground by Web. I’m eagerly awaiting Jerry’s results!
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Can that Hotcam and piston be installed on the Hawk and similar dual sports?
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If you desire a camshaft for a Hawk or other CG powered dual sport, they do exist. I have one I am going to install in my Hawk as soon as I get in a tool I am waiting on. |
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I know what your goals are. I think you made the right choices. :tup: Quote:
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I definitely want a reliable setup as I plan to log at least 500 miles per month on the bike and often venture 1-1.5 hours from home. |
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I might try to look into running dual oil coolers like Jerry is on his hawk. There’s room to mount another below my current one.
Also, I wonder if something like this would work to provide data on whether I’m running in a safe range of oil temps? Looks cheap and easy. Chrome Shorty Style Oil Tank Dipstick with Oil Temperature Gauge - Black Gauge Face - Fits 1979-2003 Harley Sportster XL and 1984-1999 Harley Softail Models - Replaces HD Part# 62668-87T (40-0361) https://www.amazon.com/dp/B07WGVVJJD..._SCRREbY46DYEC |
The oil cooler you have is big enough. You also don't want to block the air flow to the head and cylinder. I think I'll get another temperature/ volt meter like I have on my Hawk. I use it to monitor the head and oil temperature plus voltage.
Link: https://www.amazon.ca/Top-Gauge-Wate.../dp/B01M9AERIK |
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Got the bump stick in yesterday. Cylinder base gasket comes in today and i'll be ready to start working on the bike this weekend. :yay:
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