V & H PSM Engine Making 269 Ft. Lbs. Of Torque?

[piratediverjefff]

Just saw this video over on Yellowbullet and if true would equate to 389 hp?

http://www.yellowbullet.com/forum/showthread.php?t=1383034

[sportbikeryder]

The gauge is displaying horsepower, not torque (engpwr). The tq on the 180's is shown on the display below it.

[piratediverjefff]

My old blind eyes couldn't make it out on the screen anyway,I was just going by the post. :lol:Wonder how much hp those engines really make John Boy,if they're around 270 @7,600 rpms and I've heard they rev up to around 10,000?

[Rocketgeezer]

My old blind eyes couldn't make it out on the screen anyway,I was just going by the post. :lol:Wonder how much hp those engines really make John Boy,if they're around 270 @7,600 rpms and I've heard they rev up to around 10,000?

Hey Bud, whats going on there you going to build a PS motorcycle, , be like me wanting to do Top Fuel , but yes they do go 10,000 and go through valve springs like hot dogs, this part I almost don't believe, 500lbs seat pressure and 1400lbs open, and they are in the 350-375HP range, glad I'm not paying the bills

[piratediverjefff]

 

Yeah,I read that about the valve springs and what it costs just in springs alone over a season,must be a bastard to keep those huge ass valves(something around 2.5" intakes?)from floatin' at 10,000 rpms.

[Rocketgeezer]

When I was running the dragster, my spring pressure was 325-350 and about 750 open, I got maybe 25-30 runs before I could see it slowing down, and they were at the time I'm thinking $350 a set, and I went though at least 2 sets a year, also I was never near 10,000......7,500-8,000 was about it, twist it much over that and valve spring life along with a bunch of other shit crapped out real fast

[Ghost-Geezer]

My old blind eyes couldn't make it out on the screen anyway,I was just going by the post. :lol:Wonder how much hp those engines really make John Boy,if they're around 270 @7,600 rpms and I've heard they rev up to around 10,000?

Hey Bud, whats going on there you going to build a PS motorcycle, , be like me wanting to do Top Fuel , but yes they do go 10,000 and go through valve springs like hot dogs, this part I almost don't believe, 500lbs seat pressure and 1400lbs open, and they are in the 350-375HP range, glad I'm not paying the bills

Our bikes run stock about 30 lbs seat pressure and 50 lbs with a good street cam.  500 lbs to me SCREAMS the need for the same type of valvetrains used in Formula One............no springs at all.

I know the rules do not allow that, but I also know why all the spring pressure is needed.......the camshafts in those bikes look like a brick stood on its' end.  Up-across-down and repeat.  Ramps are all but non-existent.  Takes spring pressure to keep the valves from bouncing and correctly following the grind on the cams.  And lots of it.       

[Rocketgeezer]

My old blind eyes couldn't make it out on the screen anyway,I was just going by the post. :lol:Wonder how much hp those engines really make John Boy,if they're around 270 @7,600 rpms and I've heard they rev up to around 10,000?

Hey Bud, whats going on there you going to build a PS motorcycle, , be like me wanting to do Top Fuel , but yes they do go 10,000 and go through valve springs like hot dogs, this part I almost don't believe, 500lbs seat pressure and 1400lbs open, and they are in the 350-375HP range, glad I'm not paying the bills

Our bikes run stock about 30 lbs seat pressure and 50 lbs with a good street cam.  500 lbs to me SCREAMS the need for the same type of valvetrains used in Formula One............no springs at all.

I know the rules do not allow that, but I also know why all the spring pressure is needed.......the camshafts in those bikes look like a brick stood on its' end.  Up-across-down and repeat.  Ramps are all but non-existent.  Takes spring pressure to keep the valves from bouncing and correctly following the grind on the cams.  And lots of it.     

This is why they lobbied for the four valve head, as the V-rod has, but NHRA said No, and the info comes from V&H web sight so I don't think its BS, a big heavy valve at 10,000 opens 67 times a second is almost hard to believe, a friend of mine did the math years ago,

[sportbikeryder]

83 times a second at 10k. Piston is swinging 166 times a second 

[Rocketgeezer]

83 times a second at 10k. Piston is swinging 166 times a second 

If you say so John, I stand corrected, it had to be 15 years ago when a Bud told me that, I was never worth a crap at figuring stuff like that, I know theres a formula for about everything, but my brain don't compute 

[sportbikeryder]

    10,000rpm /60sec =~166 revolutions per second

Half again for the valves since it is a 4 stroke.

Of course, that's east coast math, once you get out to where Jefff hangs out, all bets are off.
 

[piratediverjefff]

  

[Ghost-Geezer]

How long is the stroke on those engines compared to ours (Gen IIs)?  Just curious...................I would like someone who is much younger and smarter than me to compute piston speed for both the Busa and one of V&H bikes at 10,000 revolutions per minute.  Piston speed - not revs per second. 

[piratediverjefff]

I saw those specs. somewhere the other day and now can't find them(even Googled bore x stroke of 160 c.i. engines[S&S,Star/Buell,V&H,etc.]and didn't come up with shit).

[piratediverjefff]

Just found it(finally)over at Star,lists it as 5 1/8" bore x 3 7/8" stroke.

http://starracing.com/vdrag.php

[fvance]

So how big is the Suzuki? Isn't it significantly smaller that the v-twins?

[Ghost-Geezer]

Stroke on our Gen IIs is 2.56 inches, compared to 3.875 inches mentioned by numbnuts above.  If my math is correct that gives the Busa a piston speed of 
4,266 inches per second compared to 6,458 inches per second for one of those big two-lungers.  A large difference.  My understanding is that once you exceed 5,200 Inches per second on a piston, you are treading on dangerous ground.   

[sportbikeryder]

Numbers for the vtwin look good to me Ghost. That is flying...and just think, that piston comes to a complete stop 4x per rev and still manages those speeds as average!

[piratediverjefff]

I've heard those motors eat valve springs in a hurry,around 1500 lbs. to compress and 5-600 lbs. seat pressure(does that sound about right John Boy)?

[Ghost-Geezer]

I've heard those motors eat valve springs in a hurry,around 1500 lbs. to compress and 5-600 lbs. seat pressure(does that sound about right John Boy)?

I would be interested to know if they last more than 2-3 runs.......certainly not much more than 3.

[piratediverjefff]

http://www.cycleworld.com/2014/01/21/navigating-the-nhra-pro-stock-motorcycle-class-with-vance-and-hines/

[Rocketgeezer]

   10,000rpm /60sec =~166 revolutions per second

Half again for the valves since it is a 4 stroke.

Of course, that's east coast math, once you get out to where Jefff hangs out, all bets are off.
 

this is true

[piratediverjefff]