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 Transmission figment
Last Post: Ferrous Head
Posted On: 3 Minutes Ago
Replies: 2
Views: 23
0 Breather timing off just a bit 1974 engine
Last Post: Ferrous Head
Posted On: 12 Minutes Ago
Replies: 22
Views: 644
0 I'm here to learn about my 81 ironhead
Last Post: Hippysmack
Posted On: 15 Minutes Ago
Replies: 7
Views: 61
0 Carb not squirting fuel
Last Post: firevf06
Posted On: 46 Minutes Ago
Replies: 10
Views: 134
10 big bore question
Last Post: IronMick
Posted On: 47 Minutes Ago
Replies: 62
Views: 12,957
0 Hottie of the day, no nudity.
Last Post: trainman
Posted On: 1 Hour Ago
Replies: 20,736
Views: 2,131,807
0 Bendix insulator block
Last Post: Hippysmack
Posted On: 1 Hour Ago
Replies: 16
Views: 551
0 ....1
Last Post: DEEP DIVER
Posted On: 1 Hour Ago
Replies: 5,677
Views: 329,230
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 2 Hours Ago
Replies: 47,982
Views: 7,708,987
0 Keep & Kill
Last Post: Graywolf
Posted On: 2 Hours Ago
Replies: 17,836
Views: 1,041,619
0 Starter Relay Issues
Last Post: Erikdowney18
Posted On: 2 Hours Ago
Replies: 10
Views: 163
0 Peanut, 3.3 or 4.5 gas tank ?
Last Post: Tomcatt
Posted On: 2 Hours Ago
Replies: 228
Views: 68,364
5 79 Harley 1000 Roadster Carb
Last Post: farmall
Posted On: 2 Hours Ago
Replies: 4
Views: 137
0 Hot Rods, Rat Rods, and Customs.
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 4,152
Views: 595,818
0 'Floppy' Forks ???
Last Post: Iron Mike
Posted On: 3 Hours Ago
Replies: 14
Views: 349
0 Was your 1st bike a Sportster?
Last Post: bill smith
Posted On: 4 Hours Ago
Replies: 1,027
Views: 251,143
0 Fun or money?
Last Post: bill smith
Posted On: 4 Hours Ago
Replies: 25
Views: 752
0 A surprising and nice experience (Peg Vibration)
Last Post: XL Dane
Posted On: 4 Hours Ago
Replies: 8
Views: 245
0 Cylinder head interchangeability.. .
Last Post: harley506d
Posted On: 5 Hours Ago
Replies: 3
Views: 73
0 77 XLT smokes a lot on start up
Last Post: brucstoudt
Posted On: 5 Hours Ago
Replies: 4
Views: 385
0 Smoke and top end job
Last Post: Civil War Harley
Posted On: 6 Hours Ago
Replies: 4
Views: 187
0 Totally no connection fault..or is there?
Last Post: npaisnel
Posted On: 6 Hours Ago
Replies: 8
Views: 129
0 Picture gallery
Last Post: JonesL
Posted On: 6 Hours Ago
Replies: 2
Views: 79
0 Experts Help - Factory OEM Tachometer 2001 883 Custom
Last Post: tbn
Posted On: 7 Hours Ago
Replies: 8
Views: 392
0 Just installed 70900274 combo gauge - fuel light stuck on
Last Post: Virto
Posted On: 7 Hours Ago
Replies: 18
Views: 258
0 Roads I'd like to ride.
Last Post: Stairman
Posted On: 7 Hours Ago
Replies: 3,164
Views: 297,577
0 Intermittent electrical problem
Last Post: Wirelic
Posted On: 7 Hours Ago
Replies: 6
Views: 149
0 What I learned today "Map Sensors"
Last Post: IXL2Relax
Posted On: 8 Hours Ago
Replies: 12
Views: 1,493
0 Stalling when given throttle - video
Last Post: Boogiemanjoe
Posted On: 8 Hours Ago
Replies: 23
Views: 3,288
0 I'm here to introduce Gristle.
Last Post: Steve9
Posted On: 9 Hours Ago
Replies: 12
Views: 210
More...
Members Birthdays
Reply
 
Share Thread Tools Display Modes
  #11  
Old 5 Days Ago
kitabel kitabel is online now
Master Mechanic
 
Join Date: Oct 2019
Posts: 276
Sportster/Buell Model: 883 Evo
Sportster/Buell Year: 1989
Reputation: 39339
kitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to behold
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 4 Days Ago
Maxeffort's Avatar
Maxeffort Maxeffort is offline
Momentary Specialist
 
Join Date: Aug 2016
Posts: 835
Sportster/Buell Model: XL1200
Sportster/Buell Year: 1996
Other Motorcycle Model: ST1100
Other Motorcycle Year: 1999
Reputation: 1282910
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 4 Days Ago
davesz1r's Avatar
davesz1r davesz1r is offline
Chief Know It All
 
Join Date: Sep 2013
Location: Escondido Ca.
Posts: 422
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 4 Days Ago
kitabel kitabel is online now
Master Mechanic
 
Join Date: Oct 2019
Posts: 276
Sportster/Buell Model: 883 Evo
Sportster/Buell Year: 1989
Reputation: 39339
kitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to behold
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 4 Days Ago
kitabel kitabel is online now
Master Mechanic
 
Join Date: Oct 2019
Posts: 276
Sportster/Buell Model: 883 Evo
Sportster/Buell Year: 1989
Reputation: 39339
kitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to behold
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 4 Days Ago
Maxeffort's Avatar
Maxeffort Maxeffort is offline
Momentary Specialist
 
Join Date: Aug 2016
Posts: 835
Sportster/Buell Model: XL1200
Sportster/Buell Year: 1996
Other Motorcycle Model: ST1100
Other Motorcycle Year: 1999
Reputation: 1282910
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 4 Days Ago
davesz1r's Avatar
davesz1r davesz1r is offline
Chief Know It All
 
Join Date: Sep 2013
Location: Escondido Ca.
Posts: 422
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 4 Days Ago
aswracing's Avatar
aswracing aswracing is offline
A Million Facts & Figures
 
Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,193
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 4 Days Ago
kitabel kitabel is online now
Master Mechanic
 
Join Date: Oct 2019
Posts: 276
Sportster/Buell Model: 883 Evo
Sportster/Buell Year: 1989
Reputation: 39339
kitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to beholdkitabel is a splendid one to behold
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 4 Days Ago
rocketmangb's Avatar
rocketmangb rocketmangb is offline
XL FORUM TEAM MEMBER
 
Join Date: Jan 2008
Location: So Cal
Posts: 21,910
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: 4400645
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 23:04.


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