Good point , Todd, But I've checked it both ways. Using a standard timing light and looking at the 5 deg marks on the pulley, but also using one with adjustable firing and reading the deg from the digital display. Either way I need to set the idle (or 1000 RPM) at about 20-24 depending on low RPM to get it run smoothly.
Well I checked TDC using plastic feeler gauges made of round plastic rods. Tested using a 1/8" rod and a 3/16" rod, both times at BTDC and ATDC, and conclude the timimg marks are on target within +/- 2 deg. Probably dead on. Then I measured the oil pump drive at TDC. It seems that where I should have an angle of 48 +/- 1 Deg, I have an angle about 37 Deg. It's really hard to "read" the angle by eye. I still swear that my photo shows it greater than 45. But careful use of a ruler, pencil, and trigonometry actually measuring on the car says it's about 37. After pencil work, even the eyeball says "less than 45". Mis-installation of the oil pump would have a larger error than that. So that seems to say the cam is misaligned with the crank, by one cam tooth (too far advanced), I think. I think the cam sprocket has 40 teeth, so 9 deg camshaft / oil pump rotation per tooth. This would be then 18 deg crank rotation. And I'm guessing that the "best" ignition firing point may be about half way between 'normal" timing to match piston position and 18 Deg "extra advanced" to match the cam timing.
But the car has run fine for 8000 miles, getting 28 MPG, and feeling fine and peppy. Is this a reasonable result with a cam 9 deg (cam not crank angle) advanced? Remember it' a KB grind , so has longer dwells.
I cannot find the KB specs. Does anyone out there have them, so I can check the valve timing? Or I can call Delta on Monday.
Tom
Well I checked TDC using plastic feeler gauges made of round plastic rods. Tested using a 1/8" rod and a 3/16" rod, both times at BTDC and ATDC, and conclude the timimg marks are on target within +/- 2 deg. Probably dead on. Then I measured the oil pump drive at TDC. It seems that where I should have an angle of 48 +/- 1 Deg, I have an angle about 37 Deg. It's really hard to "read" the angle by eye. I still swear that my photo shows it greater than 45. But careful use of a ruler, pencil, and trigonometry actually measuring on the car says it's about 37. After pencil work, even the eyeball says "less than 45". Mis-installation of the oil pump would have a larger error than that. So that seems to say the cam is misaligned with the crank, by one cam tooth (too far advanced), I think. I think the cam sprocket has 40 teeth, so 9 deg camshaft / oil pump rotation per tooth. This would be then 18 deg crank rotation. And I'm guessing that the "best" ignition firing point may be about half way between 'normal" timing to match piston position and 18 Deg "extra advanced" to match the cam timing.
But the car has run fine for 8000 miles, getting 28 MPG, and feeling fine and peppy. Is this a reasonable result with a cam 9 deg (cam not crank angle) advanced? Remember it' a KB grind , so has longer dwells.
I cannot find the KB specs. Does anyone out there have them, so I can check the valve timing? Or I can call Delta on Monday.
Tom