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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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  #11  
Old 4 Weeks Ago
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If you've got 570's keep them for now, run them after your engine upgrade, can always change cams later, if that's what you feel you need.
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  #12  
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Shifting at around 3000rpm, that lugging, you don't need a cams or new engine part.

I shift at 5000 rpm and ride crushing at 3500/4000 rpm.

Those bike are happy over 3500 and at 4000 they sing.
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Mine
Hammer 600 Cams
HSR45 Mikuni

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  #14  
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Quote:
Originally Posted by sportsterpaul View Post
If you've got 570's keep them for now, run them after your engine upgrade, can always change cams later, if that's what you feel you need.
I'd agree if it weren't for the different compression ratios even tho Wedge has shown the 560s work well at 10:1.
He does keep his battery charged tho because if it sits for a few days it starts hard. But once it's going it's not an issue the rest of the day when starting it.

I still think the 570s are what you want tho.
With your exhaust being a better top end pipe than mine, you're already going to be in the 90hp club and pull good to 6000+rpm while still having the midrange in the 80+ ft.lbs torque range without even touching the xb heads.
I've even thought about playing with baffles to get more up top but it's tough giving up pushing close to 90ft.lbs of torque at 43-4400rpm once you've had it for our style of riding.
2 lane twisties are a blast and with 1200 gearing I run mostly in 2nd and 3rd gear hitting 4th in the straight shots.

It's a nice problem to have tho. Either way I doubt you'd be disappointed. Might even change how you ride once you've experienced the 560s pull up top.

Oh, and 2in2s rule in our world and you're not beating on it. You're running that motor where it wants to run.
Who gives a shit how smooth it runs at 2200rpm with girlie cams. About as much fun as watching my grass grow.
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Last edited by 60Gunner; 4 Weeks Ago at 13:21..
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Thanks for the input from everybody.

I took the bike out last night and paid really close attention to where I ride most and where I wind it out to typically when going through the gears and tried to be as honest as possible with myself. Turns out I spend the majority of my riding in the 3,500-5,500 neighborhood. I originally looked at the wrong gearing chart, looks like I shift into the next gear at 3,500 minimum. I do wind it out to redline regularly but it appears I go through the gears to around 5,500 or so more often than to redline. I enjoy that mid range to upper mid range burst more than the all out top end. Seems like my 570s are the right choice after all so I guess I answered my own question.

Now the question becomes, what to do with the heads. In the GM LSx engine world that I’m most familiar with, stock heads pick up a lot when ported with the majority of those gains are coming from the valve job and milling, not the cnc port work. So that’s kinda got me thinking of just a $200 competition valve job versus the impact head porting for $550. Thinking it may give a little boost everywhere but I’m not opposed to doing the impact porting if it makes sense to.
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These are about 800.00 Bucks

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  #17  
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Quote:
Originally Posted by rocketmangb View Post
These are about 800.00 Bucks

I've been thinking about those. Damn you! Maybe when I get the settlement in my personal injury case. I'm hoping to get enough to get me thru to early retirement. I have to get past the work comp issues first tho. Hard to believe it's been 5 months since the crash. I still don't remember a thing about it either.

Maybe wrkdWS6 will jump on them. I'm not sure about the compression ratio with the 570s tho. Might have to use thicker gaskets.

Error wait...those are your crushes right? Not your SEs. They'd be the cat's ass with the 560s I bet. With a 1275 that would be well north of 100hp. Maybe 110.

Last edited by 60Gunner; 4 Weeks Ago at 15:04..
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I do like compression !
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I was gonna say you could never have too much head lol but I think it's more head than I need for this setup.
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Quote:
Originally Posted by wrkdWS6 View Post
I was gonna say you could never have too much head lol but I think it's more head than I need for this setup.
Yeah, me too. I might play around this winter on cleaning the ports up but really these xb heads do quite well in stock form. Porting them when running 570s has little benefit. They can vary a lot tho in casting flash. I remember Wedge saying 1 of his was pretty good but the other wasn't. Mine both appeared to be about the same. I just cleaned them up as far as carbon goes, cleaned the valves up in a drill using a scotchbrite pad to get the carbon off then 2000 grit in a bowl of water to polish them up and lapped them in and new valve guide seals obviously. My old ones were leaking pretty good which is why I pulled the valves out in the first place.
Then again I might just run them another year first then have Hammer do a competition valve job and put new springs in just to freshen them up and clean up the ports a little myself at that time. I only have 30,000 on the heads and oil has always been changed in 1500 miles or less. Service records from the previous owner who had my Indy do it showed the same.

George with his Hammer 600 cams on the other hand...with that kind of compression AND valve overlap...120+hp? That's a f'n beast! I can only imagine that ride.
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