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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  
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560's
42 Mikuni
1250 Flat Tops under home ported XB heads
V&H Side Shots Exhaust

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I would assume the 570s are less dependant on the exhaust...?
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Quote:
Originally Posted by norseXL View Post
I would assume the 570s are less dependant on the exhaust...?
"Less dependent"? No. They have the same overlap as the 560's.
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Originally Posted by Tomcatt View Post
"Less dependent"? No. They have the same overlap as the 560's.
Ah, thanks, havent studied the specks, lazy as I am...
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Tore', the 570's have 56 degrees of overlap, just like the 560's. In fact the exhaust close and intake open points for those two sets of cams are identical, the lobes are the same on that side. Reason behind that: there are ways to calculate how much overlap a motor needs, based on the ratio of displacement to intake valve area among other things, and with consideration to ramp rates and clearance with late model 1200 heads we came up with those numbers for the 560's. We were happy with the result and then carried them over to the 570's. The difference with the 570's is on the other side of the lobes, i.e. the intake close and exhaust open, which are tailored for a lower rpm range.

So bottom line, both are going to be equally sensitive to the exhaust.
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Quote:
Originally Posted by Maxeffort View Post
I'd almost always preffer to have a small efficient chamber and flat top pistons, but that's not happening with these engines. 30 degree (squish band) pistons work well if you have a big hemi type valve layout and chamber...
Ding ding ding! We have a winner!

There are good reasons 30 degree pistons are so popular in HD racing circles. The idea of the 30 degree reverse dome design was to bring those advantages to street applications in pump-gas friendly compression ratios. The thermal barrier coating does a nice job of countering the main side effect of the increase in surface area.
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Quote:
Originally Posted by aswracing View Post
Tore', the 570's have 56 degrees of overlap, just like the 560's. In fact the exhaust open and intake close points for those two sets of cams are identical, the lobes are the same on that side. Reason behind that: there are ways to calculate how much overlap a motor needs, based on the ratio of displacement to intake valve area among other things, and with consideration to ramp rates and clearance with late model 1200 heads we came up with those numbers for the 560's. We were happy with the result and then carried them over to the 570's. The difference with the 570's is on the other side of the lobes, i.e. the intake close and exhaust open, which are tailored for a lower rpm range.

So bottom line, both are going to be equally sensitive to the exhaust.
Thanks for chiming in Aaron, I'm more or less set on the 570s, just like to hear around before deciding. Sems like the 570s are a good match for the flat top pistons 1275 with XB heads?

I also have your CNC innlet and 45 Mik from my old engine and will have to fit that one.
Any tip for how long a taper would be best? also I think I remember you saying to keep a "ridge" at the floor of the channel when opening the channel to the manifold.

Anyway, I will contact you when the build gets closer.
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For a street bike, light to light, and back road twisties you can't beat the 570s. I've been more than happy with my 1250 flat tops with the 570s. 209psi cranking pressure.
You'll get higher rpm power with the 560s but fall well short of the 90ft.lbs. of torque I get by 4500 rpm with the 570s. 10+ ft.lbs. less.
Both have their place. Just depends where you you want your power.
I275 will be even better.

I should add this is with the Khromewerks HP Plus slip ons as exhaust does play a big factor. Most 2in1s won't do as well low and in the middle but better up top. My Hp levels off by 5500 or so a 2in1 may climb a little higher up there.

It's a trade off. Always is. There is no having your cake and eating it too as someone was recently looking to do but you already know that.
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Quote:
Originally Posted by norseXL View Post
Thanks for chiming in Aaron, I'm more or less set on the 570s, just like to hear around before deciding. Sems like the 570s are a good match for the flat top pistons 1275 with XB heads?

I also have your CNC innlet and 45 Mik from my old engine and will have to fit that one.
Any tip for how long a taper would be best? also I think I remember you saying to keep a "ridge" at the floor of the channel when opening the channel to the manifold.

Anyway, I will contact you when the build gets closer.
Yes, that's right. A step at the floor, where the manifold meets it, doesn't hurt a thing, no matter how square and ugly it is. In fact it may help. Just leave it alone. Match the roof and the sides. The ideal taper is 6 degrees but don't get too hung up on that. No need to go in more than about 15mm on a matching job tops. Leave the manifold as-is, just cut the port.

Not that you're really getting into reshaping the port, but rule #1 on these heads, keep the floor as long as possible and the roof as short as possible. It's the difference between those lengths that creates turbulence. That's why the XB's floor was cast so high. It almost looks like a "D" shaped intake port when you look at it. The rule of thumb is the top of that hump to the roof should be 67-69% of the intake valve diameter. But there's more to it than that.
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Quote:
Originally Posted by aswracing View Post
Yes, that's right. A step at the floor, where the manifold meets it, doesn't hurt a thing, no matter how square and ugly it is. In fact it may help. Just leave it alone. Match the roof and the sides. The ideal taper is 6 degrees but don't get too hung up on that. No need to go in more than about 15mm on a matching job tops. Leave the manifold as-is, just cut the port.

Not that you're really getting into reshaping the port, but rule #1 on these heads, keep the floor as long as possible and the roof as short as possible. It's the difference between those lengths that creates turbulence. That's why the XB's floor was cast so high. It almost looks like a "D" shaped intake port when you look at it. The rule of thumb is the top of that hump to the roof should be 67-69% of the intake valve diameter. But there's more to it than that.
Excellent, just the answer I was looking for, I'm not realy going to do much to the port anyway. In an ideal world I would have shipped them (heads) over to you but my goal is realy just a bit more fun than a bone stock 1200.
I'll be in touch come the new year, let's hope my boss is round handed with the X-mess gratiale

Tore
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