62Ranchero200
Famous Member
Background:
1962 Falcon Ranchero, 2,400 pounds on title.
250 .020 over, early 300 rods, custom forged pistons, near zero deck height, balanced and blueprinted, Clay Smith 274/274/108 hydraulic, adjustable 1.6:1 stamped rockers, heavy-duty springs with dampers, CI aluminum head (55 cc), 9.45:1 static compression, CI intake, 500 CFM Holley, DUI with about 20 degrees of initial advance, platinum plugs, CI stainless three-piece headers, 2" true duals with X-pipe and Flowmaster Series 10, TCI 2500-3000 stall converter, C-4 with shift kit, light duty six cylinder open differential with 3.50 gears. Now idles at about 1,000 RPM in park or neutral and maybe 500 RPM in gear. About 12.5" of vacuum while idling in park (no vacuum-operated accessories). Only tuning I have done so far is to set the idle mixture screws and idle speed.
Just installed an Autometer Wideband A/F ratio meter. The ratio stays around 12.5 at idle, fluctuating a bit erratically up to 13.5. Going down to about 11 at when the engine is revved and spiking briefly up to 14, then back down to 12.5 on return to idle. Haven't taken it for a drive yet, so don't yet know about cruising and WOT.
In general and taking my engine configuration into account, what ratios should I tune for at idle, cruise, and WOT? I don't care about fuel economy, but I want the engine to run as hard as it can SAFELY run. I've put way too much money into this engine to push it to failure.
Thanks
Bob the Builder
1962 Falcon Ranchero, 2,400 pounds on title.
250 .020 over, early 300 rods, custom forged pistons, near zero deck height, balanced and blueprinted, Clay Smith 274/274/108 hydraulic, adjustable 1.6:1 stamped rockers, heavy-duty springs with dampers, CI aluminum head (55 cc), 9.45:1 static compression, CI intake, 500 CFM Holley, DUI with about 20 degrees of initial advance, platinum plugs, CI stainless three-piece headers, 2" true duals with X-pipe and Flowmaster Series 10, TCI 2500-3000 stall converter, C-4 with shift kit, light duty six cylinder open differential with 3.50 gears. Now idles at about 1,000 RPM in park or neutral and maybe 500 RPM in gear. About 12.5" of vacuum while idling in park (no vacuum-operated accessories). Only tuning I have done so far is to set the idle mixture screws and idle speed.
Just installed an Autometer Wideband A/F ratio meter. The ratio stays around 12.5 at idle, fluctuating a bit erratically up to 13.5. Going down to about 11 at when the engine is revved and spiking briefly up to 14, then back down to 12.5 on return to idle. Haven't taken it for a drive yet, so don't yet know about cruising and WOT.
In general and taking my engine configuration into account, what ratios should I tune for at idle, cruise, and WOT? I don't care about fuel economy, but I want the engine to run as hard as it can SAFELY run. I've put way too much money into this engine to push it to failure.
Thanks
Bob the Builder