Cam lobe centers Gen 2 - Kawasaki ZX-10R.net
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post #1 of 12 Old 03-15-2019, 12:40 PM Thread Starter
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Cam lobe centers Gen 2

Hello all. I have searched and read various threads on lobe centers preferred. I have a Gen 2 motor with a gen 3 crankshaft and gen 2 cams. I will, at some point, change the cams when I get set up a little better. I recently rebuilt the engine and am at the cam stage of this build. The application of this engine is in a 4 wheeler that will have more weight than a bike with rider.

I have engine simulator that I use to change variables to help set up exhaust, cam timing, CR, ETC. For what I need, the lobe centers need to make more torque to get off the line (this is a drag racing application). I my simulations the best suited lobe centers seem to be 100 intake and 108 exhaust. As simulators are not perfect, I wanted to get some opinions on this. Do not focus so much on tq/hp at any given RPM, but at the relationship between power output and the lobe center changes. This mock up is with a detailed exhaust at specific lengths not seen in production bikes. Also note the compression ratio changes based on cam timing. The increased torque from cam changes is at the cost of higher cranking compression/static and dynamic.
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post #2 of 12 Old 03-15-2019, 12:45 PM
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What an awesome build! Did that quad start its life as a Raptor by chance?

You sir, have made one wicked machine!
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post #3 of 12 Old 03-15-2019, 02:36 PM Thread Starter
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Originally Posted by wheelz96 View Post
What an awesome build! Did that quad start its life as a Raptor by chance?

You sir, have made one wicked machine!
Thank you. Yes, it is a raptor 700 with modified frame and swingarm. Trying to get it ready for the 1/8 mile. Sorry I didn't make it green!
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post #4 of 12 Old 03-15-2019, 05:04 PM
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well done on the build a lot of work right there But for what i think on G2 lob centres at 100-108 ? if you can get the inlet to 100 with a minimum 0.8mm PTV then try it, engine simulators are a good tool for designing production engines but the more radical and variable the information its feed the less realistic variables itll blert out. For me i would bypass the G2 cams right from the off, see if you can get a G3 kit inlet and swap those steel inlet valves out for G3 ti valves, but then your probably thinking well maybe a G3 head is better.........yes it is much improved platform over the G2 although the exhaust valves are smaller its a head that produces better torque even before porting. But with the set up you have got i would need to be looking at a dyno chart after some base runs to start dialing cams. Others are gonna be along with more useful information shortly
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post #5 of 12 Old 03-16-2019, 12:24 PM Thread Starter
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Originally Posted by michael4012 View Post
well done on the build a lot of work right there But for what i think on G2 lob centres at 100-108 ? if you can get the inlet to 100 with a minimum 0.8mm PTV then try it, engine simulators are a good tool for designing production engines but the more radical and variable the information its feed the less realistic variables itll blert out. For me i would bypass the G2 cams right from the off, see if you can get a G3 kit inlet and swap those steel inlet valves out for G3 ti valves, but then your probably thinking well maybe a G3 head is better.........yes it is much improved platform over the G2 although the exhaust valves are smaller its a head that produces better torque even before porting. But with the set up you have got i would need to be looking at a dyno chart after some base runs to start dialing cams. Others are gonna be along with more useful information shortly
Thank you. It's been a learning experience!

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post #6 of 12 Old 03-16-2019, 01:15 PM Thread Starter
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OK.. checked the P to V at stock timing @ .018" head gasket
.042"@~10ATDC @106.5 L.C. Damn that is close for stock!
Simulated clearance
.016" @ 100L.C.
.031" @ 104L.C.


The 2008 cam shaft should yield checked at 8ATDC.
.070" @ 111L.C.
.043" @ 104L.C.
.027" @ 100L.C.

For this cam there is no point is lowering the lobe center line.
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post #7 of 12 Old 03-16-2019, 03:25 PM
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how did you make that exhaust? custom cut/weld? or other?

2004 ZX10R-few mods here and there......
and even made more Evil by Woolich.
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post #8 of 12 Old 03-16-2019, 11:01 PM Thread Starter
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how did you make that exhaust? custom cut/weld? or other?
I took the right side dual and moved to left and so forth. The header is a 2 step size and I cut the pipes where there is a step change. I cut another section 3 inches lower and raised the pipe and welded it. The other pipe I had to do the aforementioned and cut another section lower down and rotate slightly and weld. This changed the primary length from 22 to 19. This will move the power up, not really what I wanted. The last pic is it mocked up to what I thought I might do as I have not finished the exhaust.
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post #9 of 12 Old 05-03-2019, 07:14 PM
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worked out good!!

thanks for the inspiration
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2004 ZX10R-few mods here and there......
and even made more Evil by Woolich.
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post #10 of 12 Old 05-04-2019, 05:53 AM
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