SJ David Posted January 31, 2019 Share Posted January 31, 2019 OK so the specs I have are 95hp@7250rpm, 72.3 ftbls torque @ 5500 rpms. What information I am looking for is a hp and torque chart showing hp and torque in comparison to rpms. engine weight, just the engine weight also . Does anyone have this info? Thanks David Link to comment
dirtrider Posted January 31, 2019 Share Posted January 31, 2019 13 minutes ago, SJ David said: OK so the specs I have are 95hp@7250rpm, 72.3 ftbls torque @ 5500 rpms. What information I am looking for is a hp and torque chart showing hp and torque in comparison to rpms. engine weight, just the engine weight also . Does anyone have this info? Thanks David Afternoon David You will have to find someone that has run the engine (without other drivetrain) on a trusted ambient correct dyno. Most data that is available is from the rear wheel & that won't give you direct engine data as it goes through the trans & final drive. I have some old 1150 rear wheel data (if I can find it) but that was done on a rolling drum dyno so pretty useless for the info that you want. Link to comment
SJ David Posted January 31, 2019 Author Share Posted January 31, 2019 thanks for the reply, I have seen a few charts with the bike on a dyno and in each gear, all pretty close, 4th and 5th gear seem to be the closest with all charts I have seen showing 50ftlsb torque and 53hp. I am hoping someone has better data. Thanks again David Link to comment
spacewrench Posted January 31, 2019 Share Posted January 31, 2019 Huh, is that common/expected to lose ~50% HP through tranny & driveshaft? Do MotoGP racebikes do any better, or is that pretty much what happens to everybody? How about cars? Auto vs. manual transmission? I don't really have any sense for how much you pay to go through various mechanical systems. Link to comment
dirtrider Posted January 31, 2019 Share Posted January 31, 2019 1 hour ago, spacewrench said: Huh, is that common/expected to lose ~50% HP through tranny & driveshaft? Do MotoGP racebikes do any better, or is that pretty much what happens to everybody? How about cars? Auto vs. manual transmission? I don't really have any sense for how much you pay to go through various mechanical systems. Afternoon spacewrench Depends, chain drive is more efficient than a hypoid final drive, a transverse mounted engine is more efficient at getting all it's power to the rear wheel as the drive torque doesn't have to go around a 90° angle, helical gear teeth in a 3 shaft transmission also eat up a little power, & one of the big possibilities is that most rear wheel horsepower is taken on a rolling drum inertia dyno & that data is difficult to compare to a direct driven engine dyno. It's difficult to get real world BMW motorcycle engine (only) horsepower/torque through the operating range as the BMW 1150 is not a performance engine so who would go to all that bother on a stock BMW engine. Link to comment
Skywagon Posted February 1, 2019 Share Posted February 1, 2019 This isn't the answer your are looking for re: HP/Torque, etc...but thought you might like to see some data on the 1150 I saved from when I had mine....loved my 1150RT...even the whizzies... BMW R1150RT.docx Link to comment
roger 04 rt Posted February 1, 2019 Share Posted February 1, 2019 You can use a gs-911 to measure on road acceleration and from that calculate torque and horsepower. My tests suggest that the 1150 delivers about what bmw claims. Link to comment
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