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Thread: Engine Combo Questions
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06-30-2013 #1
Engine Combo Questions
I recently had a 385 SBC EFI motor built for a specific project car which I no longer have and it's getting ready to be installed
into a differant vechicle. I need some opinions on this combo. I'd like to know if everything is well matched or anything needs attention
before dropping into my new project. Intended useage is mainly daily driven street.
Also, if someone could recommend a good cruise RPM for decent mileage so I can determine my rear tires and gear ratio.
The current motor info:
385 SBC
Heads
AFR 190 heads - older non-Eliminator style - approx 66cc chambers 2.02"/1.60" AFR valves
Comp Cams beehive valve springs - 26120-16 - 155# seat press, 377 open press, max lift .590"
Comp Cams 10° Titanium Retainers - 794-16 - for above springs
COMP Cams Pro Magnum Roller Rocker Arms - 1.52 ratio 3/8" stud
COMP Cams High Energy Hydraulic Roller Lifters - 853-16 - retrofit design
Comp Cams 280XFI HR13 Cam - hydraulic roller with 230*/236* dur @ .050" lift, 0.576 int./0.570 exh. (with 1.6 rockers - I'm running 1.52 .547" int/ .541" exh)
2000-6000 rpm range (listed as 2000-5000 but incorrect confirmed by Comp Cams)
Compression should be about 9.75 or 9.8
Deck height is about .017" down
Fel-Pro head gaskets - 1003 - .041 thick, 9.1cc compressed volume - recommended by AFR
Keith Black hypereutectic pistons - 4.040" 12cc D dish piston with 5/64" rings, floating pins
Scat Pro Stock I-Beam Connecting Rods - Forged 4340 steel, I beam, 5.7" ARP cap screws, floating pins
Scat Cast Steel Crank - 2 pc rms, 3.75" stroke, ext balance, cross-drilled mains
Milodon 18756 oil pump - Std volume - high press
FluidDampr 8" ext balanced dampener
Assembly was externally balanced with flywheel and balancer
fuel injection setup
1989 TPI based MAF system - stock ecm, custom harness, PCMforLess *start up* chip - will be custom tuned after running (hopefully!!!)
Lingenfelter/Accel SuperRam plenum, runners, & base - all stock unported
Holley 58mm throttle body
Ford SVO 30# injectors
stock fuel rails
stock style regulator converted to adjustable pressure
Walbro 255 lph internal pump
Ignition is with DUI stock style big cap HEI for the 89 TPI
Hedman mid-length 1 5/8" headers with full dual 2 1/2" exhaust - no cats
Transmission is going to be an Aftermarket Tremec T56 with the .62 6th gear
What would be a good cruise rpm range for this engine combo be to shoot for for best fuel mileage? I'm thinking somewhere in the neighborhood of 1600 - 2200 rpm
for 60 - 70 mph but I don't want to get it too low or too high. I need to buy gears *once* and can't afford to experiment with differant gear ratios. I know tire size will be a factor but if I can get the rpm range nailed down, then I can figure tire diameter and rear gear ratio to attain targeted rpm range.
According to Comp Cams Camquest6 this combo should be close to 490/6000 & 490/4500 on flywheel hp & torque - I'm looking to maximize torque.
Anybody see anything that is obviously a major mis-match or needs attention? Sorry for the information overload but the more info the better, right?
Ideas and feedback appreciated!!!Doug Gulley
66 C10 383, AFR 190, Accel SuperRam, Hyd Roller 230*/236* 280XFI, aftermarket T56, *under construction*
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07-03-2013 #2
Anybody??? 80+ views and no comments whatsoever ...
Doug Gulley
66 C10 383, AFR 190, Accel SuperRam, Hyd Roller 230*/236* 280XFI, aftermarket T56, *under construction*
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07-03-2013 #3