July 11th, 2020, 09:15 AM | #1 |
ninjette.org member
Name: Emu
Location: Oklahoma
Join Date: Jun 2019 Motorcycle(s): 2011 Ninja 250r Posts: 55
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Crazy japanese racer tinkers with EVERYTHING
https://www.youtube.com/watch?v=yK1g6wyZ4Rw
Link to original page on YouTube. |
1 out of 1 members found this post helpful. |
July 11th, 2020, 11:34 AM | #2 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Good find!
To reach 180kph, he'll need to get about 45bhp out of engine. Certainly possible with big-bore high-compression pistons. Retard intake-cam. More duration and overlap. Higher lobe-centres. Still need to do something about restrictive intake-ports. Must be nice to have dyno right at track so you can go out to test right after changing settings. Having programmable EFI system makes it so, so much easier. Last futzed with by DannoXYZ; July 11th, 2020 at 01:53 PM. |
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July 11th, 2020, 12:02 PM | #3 |
ninjette.org member
Name: Emu
Location: Oklahoma
Join Date: Jun 2019 Motorcycle(s): 2011 Ninja 250r Posts: 55
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I knew you would love this video Danno lol
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1 out of 1 members found this post helpful. |
July 11th, 2020, 01:21 PM | #4 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Such awesome tools! Actually measuring cam specs, that's real tuning!!!
I'm not sure which model GPX-250R he's referring to, could it be our '88-07 pregen? Those cam-specs can't possibly match new-gen's. Early '88-93 had massive cam, something like 290-degree duration! That's partly how it was able to make max-power around 12500 rpms with very little torque-drop in upper-rpms. Caused lazy low-end though. The '94-07 pre-gens had tamed-down cams and had much better more civilised low-end without massive upper-RPM hit (like 2-strokes). EDIT: Ah, he's referring to aftermarket Beet cams. yes, those may match early pre-gens. Maybe I should get my hands on set... hmm... Didn't think removing balancer would do such. It does save about 4bhp on 250bhp Porsche 951 engine. But removing balancer caused issues (aside from vibration), such as cracking oil-pickup tubes going to oil-pump, leaking oil-pan gasket etc. 944-spec racing rules forbid removing balancer-shaft belt due to headaches it caused and goes against goal of cheap clean fun. That and no one wants to be following you when you dump entire 8-quarts of oil on track! |
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