The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE & BUELL MOTORCYCLE FORUM - GENERAL DISCUSSION > DYNO Charts and Result
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

DYNO Charts and Result Post your dyno charts and results here.

Active Threads
0 Clutch squeal ? Bad throwout bearing ?
Last Post: boomerguy
Posted On: 1 Minute Ago
Replies: 76
Views: 14,427
0 Hot Chicks on Hot Bikes
Last Post: boomerguy
Posted On: 8 Minutes Ago
Replies: 11,063
Views: 2,172,854
0 The salty debate thread.
Last Post: NLXL
Posted On: 39 Minutes Ago
Replies: 46
Views: 1,829
0 Anyone go racing last weekend?
Last Post: cycowrencher
Posted On: 39 Minutes Ago
Replies: 3,224
Views: 332,527
0 21 vs 22 vs 23 teeth sprocket
Last Post: dave76
Posted On: 55 Minutes Ago
Replies: 16
Views: 395
0 MPG HONESTLY, what do you get?
Last Post: XL Dane
Posted On: 1 Hour Ago
Replies: 610
Views: 87,294
0 Sportster fans, tell us why!
Last Post: 1200CustomHD
Posted On: 1 Hour Ago
Replies: 655
Views: 180,632
0 Static timing
Last Post: ftwflh
Posted On: 1 Hour Ago
Replies: 10
Views: 468
0 Race Reort: Some Disasters, Some Wins
Last Post: Ferrous Head
Posted On: 2 Hours Ago
Replies: 8
Views: 141
0 Hottie of the day, no nudity.
Last Post: trainman
Posted On: 3 Hours Ago
Replies: 22,077
Views: 2,260,484
0 My take on the world ~ Photo by Trace
Last Post: sportytrace
Posted On: 5 Hours Ago
Replies: 1,109
Views: 164,362
0 05 carb rebuild no start
Last Post: IXL2Relax
Posted On: 6 Hours Ago
Replies: 17
Views: 842
0 Range With Carby 3.3 Gal Tank
Last Post: smilinbrad
Posted On: 7 Hours Ago
Replies: 91
Views: 47,898
0 Kick starter resistance
Last Post: Whitewalls
Posted On: 7 Hours Ago
Replies: 18
Views: 540
0 Roads I'd like to ride.
Last Post: sportytrace
Posted On: 8 Hours Ago
Replies: 3,240
Views: 310,849
0 This week on Craig's list
Last Post: randy3934
Posted On: 8 Hours Ago
Replies: 4,828
Views: 660,245
0 Iree's late night cafe
Last Post: sportytrace
Posted On: 8 Hours Ago
Replies: 1,706
Views: 233,889
0 Food porn
Last Post: sportytrace
Posted On: 8 Hours Ago
Replies: 2,088
Views: 411,697
0 $700 Ironhead ? Good value? depends who you ask
Last Post: Iron Mike
Posted On: 9 Hours Ago
Replies: 44
Views: 2,561
0 Starter solenoid short
Last Post: Yellowstone Kelly
Posted On: 9 Hours Ago
Replies: 6
Views: 221
6 ironhead turn signals
Last Post: Maxeffort
Posted On: 9 Hours Ago
Replies: 4
Views: 82
0 Smacked a deer last night
Last Post: Deimus
Posted On: 9 Hours Ago
Replies: 17
Views: 619
0 Cylinder head painting and battery and kick start advice
Last Post: BigMek
Posted On: 9 Hours Ago
Replies: 1
Views: 114
0 Handlebar risers
Last Post: boomerguy
Posted On: 9 Hours Ago
Replies: 15
Views: 317
0 Spitfire motorcycle 2 into 1 Blaster
Last Post: sportsterpaul
Posted On: 9 Hours Ago
Replies: 3
Views: 131
0 Ultima electronic ignition installation - Solved
Last Post: IXL2Relax
Posted On: 10 Hours Ago
Replies: 78
Views: 3,167
0 Hello New in the Forum
Last Post: sportsterpaul
Posted On: 10 Hours Ago
Replies: 13
Views: 353
0 Snippets
Last Post: sportsterpaul
Posted On: 11 Hours Ago
Replies: 240
Views: 24,178
0 Opinions (On Bike Considering Buying)
Last Post: Racepres
Posted On: 11 Hours Ago
Replies: 16
Views: 412
0 79-85 Breather Vent Mod - Adding a Secondary Vent Hose at 6:00 Position
Last Post: Hippysmack
Posted On: 11 Hours Ago
Replies: 15
Views: 569
More...
Members Birthdays
yeller1200, IronMick (78), painter (71), motobob883 (68), rickxx (66), MRCLEEN (48), Wetcheez (47), hello_shoes (40)
Reply
 
Share Thread Tools Display Modes
  #11  
Old 31st July 2020
kitabel kitabel is offline
Harley Engineer
 
Join Date: Oct 2019
Posts: 326
Sportster/Buell Model: 883 Evo
Sportster/Buell Year: 1989
Reputation: 105148
kitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud of
Default

Not familiar with this as a limit, and that DCR sounds high to me. What IVC point @ nominal duration?

BTW: the "correction factor" is a number the operator invents to make the output chart show numbers he likes. Vizard is famous for testing engines built by big-name shops that produce 100 hp less on his dyno...
Yes, it's completely subjective.
Reply With Quote
  #12  
Old 1st August 2020
Maxeffort's Avatar
Maxeffort Maxeffort is offline
Momentary Specialist
 
Join Date: Aug 2016
Posts: 865
Sportster/Buell Model: XL1200
Sportster/Buell Year: 1996
Other Motorcycle Model: ST1100
Other Motorcycle Year: 1999
Reputation: 1451966
Maxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond repute
Default

Quote:
Originally Posted by kitabel View Post
Not familiar with this as a limit, and that DCR sounds low to me. What IVC point @ nominal duration?

BTW: the "correction factor" is a number the operator invents to make the output chart show numbers he likes. Vizard is famous for testing engines built by big-name shops that produce 100 hp less on his dyno...
Yes, it's completely subjective.
some unscrupulous dyno operators can deliberately skew or misuse correction factor.

To claim that correction factor is “completely subjective” or something “the operator invents” is simply NOT true.

Correction factor is to SAE standard conditions. The importance is so that an engine tested under any condition, will correct to standard conditions.

I have run thousands of dyno tests and that have been corrected to standard conditions. I have also done all the math many times to verify that the software is correcting properly. If testing and I see a bigger (or smaller) than expected correction factor, it’s a good reason to look and find out why.

Read a bit here:

http://www.mie.uth.gr/ekp_yliko/SAE_...917;Κ.pdf
__________________
“This life’s hard, but it’s harder if you’re stupid”
Reply With Quote
  #13  
Old 1st August 2020
davesz1r's Avatar
davesz1r davesz1r is offline
Chief Know It All
 
Join Date: Sep 2013
Location: Escondido Ca.
Posts: 424
Sportster/Buell Model: xlh 883 hugger
Sportster/Buell Year: 1997
Other Motorcycle Model: kz1000 z1r
Other Motorcycle Year: 1978
Reputation: 60703
davesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to behold
Default

Quote:
Originally Posted by kitabel View Post
Not familiar with this as a limit, and that DCR sounds low to me. What IVC point @ nominal duration?

BTW: the "correction factor" is a number the operator invents to make the output chart show numbers he likes. Vizard is famous for testing engines built by big-name shops that produce 100 hp less on his dyno...
Yes, it's completely subjective.
Ok, I'll bite. What corrected or dynamic cr doesn't seem too low? Aaron at hammer performance suggests max of 9.2:1 on pump gas. My 1275 is at 9.3:1 and will detonate on 91 octane. 28 degrees total timing and Lucas octane booster and all is good.
__________________
1275 cc 10.54:1 cr se heads .560 cams hsr42 dyna 2000p patriot defender 11.63@ 115 1/4
Reply With Quote
  #14  
Old 1st August 2020
kitabel kitabel is offline
Harley Engineer
 
Join Date: Oct 2019
Posts: 326
Sportster/Buell Model: 883 Evo
Sportster/Buell Year: 1989
Reputation: 105148
kitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud of
Default

Correction factor is to SAE standard conditions.

Yes, I'm familiar with GM Test 20, but the factored in adjustment relies on the operator not to... push the envelope.
How else would the results of 2 tests done within days of each other on the same brand dyno in the same town show an engine at 740 hp, and Vizard reports 665?
Reply With Quote
  #15  
Old 1st August 2020
kitabel kitabel is offline
Harley Engineer
 
Join Date: Oct 2019
Posts: 326
Sportster/Buell Model: 883 Evo
Sportster/Buell Year: 1989
Reputation: 105148
kitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud of
Default

I wrote an Excel program to calculate CCP and DCR from IVC, rod geo, and static CR. 10.1:1 needs closing at only 47 ABDC to drop to 9:1. Closing @ 70 (much more likely) gives 7.8:1.
Where is your IVC?
Reply With Quote
  #16  
Old 1st August 2020
Maxeffort's Avatar
Maxeffort Maxeffort is offline
Momentary Specialist
 
Join Date: Aug 2016
Posts: 865
Sportster/Buell Model: XL1200
Sportster/Buell Year: 1996
Other Motorcycle Model: ST1100
Other Motorcycle Year: 1999
Reputation: 1451966
Maxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond repute
Default

Quote:
Originally Posted by kitabel View Post
Correction factor is to SAE standard conditions.

Yes, I'm familiar with GM Test 20, but the factored in adjustment relies on the operator not to... push the envelope.
How else would the results of 2 tests done within days of each other on the same brand dyno in the same town show an engine at 740 hp, and Vizard reports 665?
Either your equipment and sensors are in calibration or not.

If some one wants to cheat, they can in a variety of ways. That’s not pushing any envelope... its plain cheating.

As far as same engine on two dynos.... this is popular on forums. I’d have to see all the data and conditions for both runs on both days.
Reply With Quote
  #17  
Old 1st August 2020
davesz1r's Avatar
davesz1r davesz1r is offline
Chief Know It All
 
Join Date: Sep 2013
Location: Escondido Ca.
Posts: 424
Sportster/Buell Model: xlh 883 hugger
Sportster/Buell Year: 1997
Other Motorcycle Model: kz1000 z1r
Other Motorcycle Year: 1978
Reputation: 60703
davesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to beholddavesz1r is a splendid one to behold
Default

Quote:
Originally Posted by kitabel View Post
I wrote an Excel program to calculate CCP and DCR from IVC, rod geo, and static CR. 10.1:1 needs closing at only 47 ABDC to drop to 9:1. Closing @ 70 (much more likely) gives 7.8:1.
Where is your IVC?
Impact 560 cams. 48 degrees abdc. Your math would appear to be very accurate. I'm lazy and just use the calculator on hammers website. I don't know 60gunners cam specs. Suspect bottom end to midrange cams with early intake closing. Btw, my static cr is 10.53:1. 60gunner is shooting for 10:1.
Reply With Quote
  #18  
Old 1st August 2020
aswracing's Avatar
aswracing aswracing is offline
A Million Facts & Figures
 
Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,207
Sportster/Buell Model: XL883
Sportster/Buell Year: 2007
Sportster/Buell Model #2: Buell Cyclone
Sportster/Buell Year #2: 1999
Reputation: 2979240
aswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond repute
Default

Quote:
Originally Posted by kitabel View Post
BTW: the "correction factor" is a number the operator invents to make the output chart show numbers he likes.
I can assure you that Dynojet Dynamometers don't allow you to "invent" the CF. A weather station is built into the electronics stack. The software reads the environmental conditions at the time each pull is made and calculates the number automatically and applies it when it graphs the result. You can select the type of correction (SAE, STD, etc), but you can't fiddle with the number.
__________________
Click Here to Contact Me

Reply With Quote
  #19  
Old 1st August 2020
kitabel kitabel is offline
Harley Engineer
 
Join Date: Oct 2019
Posts: 326
Sportster/Buell Model: 883 Evo
Sportster/Buell Year: 1989
Reputation: 105148
kitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud ofkitabel has much to be proud of
Default

The only vague dimension is the "ratio of variable heats of compressible gasses" exponent, given ideal as 1.4. This generally gives an unrealistically high figure, mine is around 1.25-.29 depending on the cooling system.
Here's some more of my comments on my site here: http://victorylibrary.com/mopar/cam-tech.htm
Reply With Quote
  #20  
Old 1st August 2020
rocketmangb's Avatar
rocketmangb rocketmangb is online now
XL FORUM TEAM MEMBER
 
Join Date: Jan 2008
Location: So Cal
Posts: 21,994
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2006
Sportster/Buell Model #2: XL1200C
Sportster/Buell Year #2: 2006
Other Motorcycle Model: 48 "Totalled" By a Douche
Other Motorcycle Year: 2012
Reputation: 4475060
rocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond repute
Default

Project TQ Pig is 11.79:1 Static
Still deciding on cams
__________________
Thy Sportster Come
It Shall Be Done
On Earth as it is on Salt
2006 Sportster XL1250C
Hammer Sledge Heads 1.98X1.61 Valves
Hammer 600 Cams
Big Ass CP/Hammer Pistons
Mikuni HSR 45 /Hammer Billet Manifold (Now HSR 48)
Jetted 27.5 slow,182.5 Main
97 Needle,Clip posistion 3
Hurricane Flow 3" offset AC,Rocketman Mod
Daytona Twin Tec TC88A,Rico Scarecrow Map
Sumax Thundervolt plug wires,NGK DCPR8EIX spark plugs. Gapped .040 and Indexed
Cycle Electric Stator and Regulator
Alto Carbonite Clutch (now with Barnett Pressure plate and 25% stiffer spring)
Royal Purple 20W50 MC Primary oil
Patriot Defender Pipe
Royal Purple 20W50 MC Engine Oil
Napa 7148 oil filter
Max Power, 111.47
Max Torque, 84.39
Best 1/4 Mile ET to date 11.85
Best 1/4 Speed to date 115.14
Build by Jester Motorwerkz West
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT +1. The time now is 13:16.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC