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Posted:
Wed Feb 13, 2008 5:14 amby maxracesoftware
This is a Starr Racing ProBike Engine
in the Year 1990 talked about at the
SuperFlow Technology Conference
Starr Racing - George Bryce
SF-901 Dyno at 300 RPM/SEC
Fuel Specific Gravity= .705
Vapor Pressure= .89
Barometric Pressure= 29.89 in Hg.
Engine Displacement= 79.0
Stroke= 2.600 inches
Peak HP= 249.5 at 12,000 RPM
Peak TQ= 116.6 at 10,600 RPM
PipeMax Program correlation Pictures=>
Posted:
Wed Feb 13, 2008 5:24 amby maxracesoftware
in this next Simulation picture
notice how well PipeMax's calculate
necessary "Minimum Valve Lift's to Prevent Choke"
correlate with Starr Racing's
Cam Specs of =>
Starr Racing's Intake Cam Lift= .420" PipeMax=.419" Lift
Starr Racing's Exhaust Cam Lift= .380" PipeMax= .380" Lift
Posted:
Wed Feb 13, 2008 5:31 amby maxracesoftware
Another PipeMax simulation,
this time Starr Racing's ProStock 1990 NHRA Record
holding MotorCycle 4-Valve Suzuki
At the 1990 SuperFlow Technology Conference
George Bryce displayed a Movie of Dyno Run
and Dyno Data
George stated his Record holding Engine only made
234.3 Peak HP and 115.5 Peak TQ
and that he sold duplicate ProStock Engines
to Customers with more Power than he had like
in this Picture
George had 234.3 Peak HP
Customer's Engines were between= 238-242 Peak HP 1990 year
Posted:
Wed Feb 13, 2008 5:33 amby maxracesoftware
Posted:
Wed Feb 13, 2008 12:34 pmby wfolarry
George Bryce & George Smith have teamed up as G squared to build some of the best Vtwin motors on a Harley platform. Their motors crank out some serious #'s.
Posted:
Wed Feb 13, 2008 9:55 pmby maxracesoftware
Posted:
Wed Feb 13, 2008 10:44 pmby SWR
Posted:
Thu Feb 14, 2008 5:11 amby SWR
Posted:
Fri Feb 15, 2008 5:26 pmby stevenford
Hey Larry
If you didn't know the flow figures how did you get the VE
Posted:
Sat Feb 16, 2008 6:19 amby maxracesoftware
Posted:
Sat Feb 16, 2008 11:12 pmby maxracesoftware
quoted from DVD=>
Stock Suzuki 1100cc
90 to 100 Flywheel HP
mild Dyno Tune=> 100 to 105 Flywheel HP
27 mm Intake Valves = 1.063"
23 mm Exhaust Valves= .906"
Stock Flow CFM = 75 CFM @10inches at .300" Lift
----------------------------------------------------
ProStock Bike Specs=>
31 mm Intake Valves = 1.221"
26 mm Exhaust Valves= 1.024"
140+ CFM @10inches at .400" Lift
or
between 235 to 240 CFM at 28inches at .400" Lift
380 cranking psi using 2 Batteries
cranking RPM unknown
****************************
Basically this is 18 years ago
and it appears that Engine is only accessing around
187 to 197 CFM @28" out of potential 235-240 CFM
234 HP back then was excellent ,
but HP today is about a 100 more HP
Posted:
Mon Feb 18, 2008 10:25 amby larrycavan
Posted:
Fri Feb 22, 2008 10:37 pmby larrycavan
I received and watched the video today. Claimed head flow at 28" is 225 - 240 CFM. If Ve is raised to represent the actual head flow, Ve jumps to 129.3 for the smaller, record setting engine.
That should help out a bunch for number crunching. That's very typical to what we seem to run into when having no dyno data and only head raw flow data to work with. Make the Ve number high enough to show that all the actual flow is being utilized and Ve get's out of the realm of reality for most of our engines.
It seems the engine actually used 79% of available CFM. I shudder to think what a monstor this thing would be if it used all available CFM after watching the video.
With 380 lbs of dynamic compression pressure, George could not give the engine full throttle below 8000RPM on the dyno or the cylinder pressure would blow the rods right through the block.... :p
I used the 79% of available flow on another engine I did that typically should produce about 50 HP at the crank. Previous Ve was at 135% when I adjusted Ve to get raw CFM numbers correct. HP was showing 66.6 [BEST]. New numbers with 79% of actual flow used as a correction mechanism....HP fell right in place at 50HP [BEST].
Might just be something useful in that 79% calculation for 4V motors to model better in PipeMax...
Edited By larrycavan on 1203734847
