[Stan Weiss]

Originally Posted by Half-Inch Stud

Stan, that calc looks useful. Very high HP and TQ predicts for a 400.

Suppose the VE needs factored by Lobe ramp speeds? My studies have always tried to assess the required Octane to be ping-free, and looks like the Roller cams always have FAST ramps compared to ancient successful HYD Flat tappet cams. Roller Springs are bad enough, and seems to me Fast ramp roller cams work on aluminum heads but their fast ramps are not Street optimal for Iron heads...that prefer to ping.

Valve seat integrity with Aluminum heads keeps my wallet wad intact. Toyota Head MGR tells me their valveseats use a ceramic frits that gets laser welded into the head, for Production. Not Berylium, not stainless, no such press-in anything.

Mark,
I don't see BSFC being that good with 9.5:1 CR. But I still see that HP at around 100% VE.

Engine_Size_=_405.7955__-__RPM_=_6000__-__Blower_Pressure_=_.00
Barometric_Pressure_=_29.9200__-__Temperature_=_60.00

Air_/_Fuel_Ratio_=_13.00000

_6000_-_RPM

BSFC_________________________________0.4600___0.46 50___0.4700___0.4750___0.4800
___VE%_____Air______Air______Fuel_____BSFC_____BSF C_____BSFC_____BSFC_____BSFC
__________kgs/s____lbs/hr___lbs/hr_____HP_______HP_______HP_______HP_______HP
_0.9750__0.3964__3146.163__242.013___526.11___520. 46___514.92___509.50___504.19
_0.9800__0.3984__3162.297__243.254___528.81___523. 13___517.56___512.11___506.78
_0.9850__0.4005__3178.431__244.495___531.51___525. 80___520.20___514.73___509.36
_0.9900__0.4025__3194.565__245.736___534.21___528. 46___522.84___517.34___511.95
_0.9950__0.4045__3210.699__246.977___536.91___531. 13___525.48___519.95___514.54
_1.0000__0.4066__3226.833__248.218___539.60___533. 80___528.12___522.56___517.12
_1.0050__0.4086__3242.968__249.459___542.30___536. 47___530.76___525.18___519.71
_1.0100__0.4106__3259.102__250.700___545.00___539. 14___533.40___527.79___522.29
_1.0150__0.4127__3275.236__251.941___547.70___541. 81___536.05___530.40___524.88
_1.0200__0.4147__3291.370__253.182___550.40___544. 48___538.69___533.02___527.46
_1.0250__0.4167__3307.504__254.423___553.09___547. 15___541.33___535.63___530.05

CARFOR_Version:_4.4.2_--_Registered_to:___Stan_Weiss

Stan