mekomaskin skrev:En liten fundering bara:
Om Erland lyckas plocka ut 211 hästar med en KG6 kamaxel, vad är det då som blir så mycket bättre med dom moderna profilerna....?
KG 6 är en Enem H3 och det är en väldigt bra kam.
Motorn har 92 i borr vilket ger bra mycket bättre flöde än 89mm.
Den har 85 i slag och stake samt kolv väger mer än 500 gram mindre, tror det var 700 gram än original.
Det ärr smalare ringar, veven är strömlinjeformad, förgasarna som är för små är portade allt vad det går.
Jag ska prova den Hedlund kammen som Jens säljer på en annan motor men det får bli med 50 DCO.
Denna motorn är inte särskilt bra med 105,6% i VE men det är en gammal B20.
Och den spikar vid max vrid på 36 grader med 98 oktan så jag fick sänka tändningen.
137.903 Cubic Inches @ 6987 RPM with 105.60 % Volumetric Efficiency PerCent
Required Intake Flow between 189.4 CFM and 199.5 CFM at 28 Inches
Required Exhaust Flow between 142.9 CFM and 156.5 CFM at 28 Inches
600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 199.4 207.6 211.7 215.8
Peak Torque Lbs-Ft 166.2 173.0 176.4 179.9
HorsePower per CID 1.446 1.506 1.535 1.565
Torque per Cubic Inch 1.205 1.255 1.279 1.304
BMEP in psi 181.7 189.2 192.9 196.7
Man kan se att den dåliga volumetriska verkningsgraden till viss del beror på ventillyftet som är 12mm.
Pipemax beräknar med ett spel på 0.025" så det krävs minst 12,9mm lyft på ventilen i min motor.
-Recommended Camshaft Valve Lift-
Minimum Normal Maximum
Intake = 0.533 0.574 0.632
Exhaust = 0.491 0.528 0.581
Max-effort Intake Lift = 0.662
Max-effort Exhaust Lift = 0.609
Minimum Intake Valve Lift to prevent Choke = .574 Lift @ 6987 RPM
Minimum Exhaust Valve Lift to prevent Choke = .528 Lift @ 6987 RPM
Här är Pipemax insugningslängder:
- Induction System Tuned Lengths - ( Cylinder Head Port + Manifold Runner )
1st Harmonic= 34.559 (usually this Length is never used)
2nd Harmonic= 19.615 (some Sprint Engines and Factory OEM's w/Injectors)
3rd Harmonic= 13.694 (ProStock or Comp SheetMetal Intake)
4th Harmonic= 10.778 (Single-plane Intakes , less Torque)
Insugningsportarea, Jag har mellan 38 och 39mm i minsta kanaldiameter, minns inte exakt.
285 FPS Velocity CSA= 1.595 sq.in. at 6987 RPM Recommended Smallest Port CSA 36.2mm
260 FPS Velocity CSA= 1.748 sq.in. at 6987 RPM Recommended Port CSA 37.9mm
250 FPS Velocity CSA= 1.818 sq.in. at 6987 RPM Recommended Port CSA 38,6mm
Avgasportarea: Jag har 33,5 mm under ventilen
285 FPS Velocity CSA= 1.261 sq.in. at 6987 RPM Recommended Smallest Port CSA 32,2
250 FPS Velocity CSA= 1.437 sq.in. at 6987 RPM Recommended Port CSA 34,4
240 FPS Velocity CSA= 1.497 sq.in. at 6987 RPM Recommended Port CSA 35,1
Avgassystemsberäkning, jag har för mig att mina rör är 42mm utvändigt och 29,5" långa.
Sen har jag en mergekollektor med Pipemax beräknad megafon.
--- Single Primary Pipe Specs --- for 137.903 CID from 4987 to 7487 RPM
Diameter= 1.494 to 1.619 Length= 30.2 to 32.6 inches long
--- 2-Step Primary Pipe Specs ---
1st Dia. inches= 1.494 Length= 15.1 to 16.3
2nd Dia. inches= 1.619 Length= 15.1 to 16.3
--- 3-Step Primary Pipe Specs ---
1st Dia. inches= 1.494 Length= 10.1 to 10.9
2nd Dia. inches= 1.619 Length= 10.1 to 10.9
3rd Dia. inches= 1.744 Length= 10.1 to 10.9
--- Header Collector Specs (Conventional Straight Tube) ---
Diameter= 3.024 Tuned Lengths= 16.5 best and 8.2 or 33.0
--- Header Collector Specs (Megaphone or Diffuser Cone Shape) ---
Diameter= 2.524 taper to 3.024 Megaphone/Diffuser Length= 16.5 inches
H-Pipe= 16.5 X-Pipe= 66.0 distance behind end of Primary Tube ends
-- Total Exhaust System Tuned Lengths (Primary ends to TailPipe end) --
Best HP/TQ Tuned Collector Lengths= 16.5 , 33.0 , 66.0 , 132.0 inches long
Worst HP/TQ Loss Collector Lengths= 24.7 , 49.5 , 99.0 , 197.9 inches long
Note=> measured from where the Primary Pipes end inside the Collector to
the point the tailpipe exits into the atmosphere.
Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness
---- Primary Pipe's Harmonics ----
1st Harmonic = 132.2 inches long ... typically never used
2nd Harmonic = 50.3 inches long ... longest recommended
3rd Harmonic = 30.2 inches long ... highly recommended , best Torque Curve
4th Harmonic = 21.1 inches long ... shortest recommended
5th Harmonic = 15.9 inches long ... typically never used
6th Harmonic = 12.6 inches long ... typically never used
7th Harmonic = 10.2 inches long ... typically never used
8th Harmonic = 8.5 inches long ... typically never used
---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ----
1st Harmonic = 132.0 inches long ... longest with Mufflers and TailPipes
2nd Harmonic = 66.0 inches long ... longest recommended with Mufflers
3rd Harmonic = 33.0 inches long ... more bottom-end Torque
4th Harmonic = 16.5 inches long ... highly recommended , best Torque Curve
5th Harmonic = 8.2 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 4.1 inches long ... reduced Torque , not recommended
Erland