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Engine Mechanical / Electrical / New build disappointment
« on: May 21, 2014, 04:12:29 PM »
So I took the new combo to the lake today for some test and tune. I'm hugely disappointed in the performance. Maybe a few of you experts here can look at the details and tell me where I went wrong with my recipe for big power and better than stock speed.
I spent a couple hours on the lake today doing carb tuning. I swapped jets about 6 times. I've been from 86 squared to 80 squared with no change in max rpm. none. zero. When I got down into the 70's, 76 exactly, It started to ping, So I went back up from there.
Engine: 521 Ford - Eagle rotation assy 4.3 Steel crank Mahle pistons 38cc dish final CR approx 9.75:1
Heads :D0VE C , mild port work.
Cam: In 345 Exh 359 at cam duration Int 228 Exh 238 max lift at intake occurs at 109 degrees ATDC and at exhaust 119 degrees BTDC - Hydraulic roller
Comp gold roller rockers 1.7 ratio
Intake: Stealth
Carb: Holley 850 HP Ultra jetted at 84 square. 4.5 power valves front and rear.
Fuel system: Holley blue pump and regulator 6psi
Dist: Summit billet mechanical. Timing is set to 36 degrees all in at 3400
Exhaust: Harman Marine Long bolt logs.
Drive: Berkeley 12JG
Bowl: Dominator HD
Impeller: Dominator skirted AA cut
Place diverter
Boat: 21' Eliminator Sport Cruiser. No interior. 20 gallons of fuel. 2 people.
Performance: 4500 RPM and 58 mph @ 4100 feet altitude here.
According to the Berkely chart I'm making a whopping 325 HP. Sweet. I could have done that with a stock 460 and saved THOUSANDS.
Help? Advice? Suggestions?
Regards, -Todd-
I spent a couple hours on the lake today doing carb tuning. I swapped jets about 6 times. I've been from 86 squared to 80 squared with no change in max rpm. none. zero. When I got down into the 70's, 76 exactly, It started to ping, So I went back up from there.
Engine: 521 Ford - Eagle rotation assy 4.3 Steel crank Mahle pistons 38cc dish final CR approx 9.75:1
Heads :D0VE C , mild port work.
Cam: In 345 Exh 359 at cam duration Int 228 Exh 238 max lift at intake occurs at 109 degrees ATDC and at exhaust 119 degrees BTDC - Hydraulic roller
Comp gold roller rockers 1.7 ratio
Intake: Stealth
Carb: Holley 850 HP Ultra jetted at 84 square. 4.5 power valves front and rear.
Fuel system: Holley blue pump and regulator 6psi
Dist: Summit billet mechanical. Timing is set to 36 degrees all in at 3400
Exhaust: Harman Marine Long bolt logs.
Drive: Berkeley 12JG
Bowl: Dominator HD
Impeller: Dominator skirted AA cut
Place diverter
Boat: 21' Eliminator Sport Cruiser. No interior. 20 gallons of fuel. 2 people.
Performance: 4500 RPM and 58 mph @ 4100 feet altitude here.
According to the Berkely chart I'm making a whopping 325 HP. Sweet. I could have done that with a stock 460 and saved THOUSANDS.
Help? Advice? Suggestions?
Regards, -Todd-


