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Why more motorcycle engines don't use hydraulic valve adjusters
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Moto Guzzi produced a hydraulic lifter version of their 1100 motor in 2003. The introduction didn't go so well because incorrect (stiff) springs were used. This resulted in trashed cams and engines if it wasn't caught quickly enough and a lot of ill feelings toward hydraulics thereafter. It's too bad Guzzi bungled it- the hydro motor is really sweet once it is fixed. I know because I have one. There's no reason BMW couldn't make one but I suspect that some diehards will be opposed to such newfangled gimmickry, 'just because'. |
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Mon Dec 20, 2021 5:18 pm (Last edited: Mon Dec 20, 2021 5:20 pm)
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Most motorcycle engines are very high revving relative to most car engines. Even high revving cars like the new Corvette ZR1 and Honda S2000 don't have hydraulic lifters. The added complication gets to be a problem at those higher revs. Harley has had hydraulic valve lifters for a long time, because their engines are chromed up agricultural engines. Harley buyers expect them so Harley figured out a way on the PanAm. 2020 R1250RS |
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Mon Dec 20, 2021 11:50 pm (Last edited: Mon Dec 20, 2021 11:51 pm)
Zitat von Paul911 im Beitrag #17 If I recall correctly, my 1986 Nighthawk S 700 had a redline of 11K rpm. It used hydraulic valve adjusters for its overhead cam engine. Current motorcycle collection: 2002 Yamaha FZ1; 2020 KTM 390 Duke; 2011 Royal Enfield Bullet 500; 2009 BMW F650GS; 2016 BMW R1200RS; 2018 Zero S 16.6 kWh |
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Zitat von Richard230 im Beitrag #18Zitat von Paul911 im Beitrag #17 Loved the Nighthawk S! Very different setup. No long pushrods or hydraulic lifters. The hydraulic component is very compact. Honda showing you can have your cake and eat it too  |
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