The EDM oil holes you'll see in US V6 and V8 lifters are because the tappet body has access to pressurized oil a drilling in the tappet bore. Thus they're able to direct that supply of pressurized oil through the tappet body and out the small EDM made hole on the tappet face.
tbuelna,
Thanks for the reply and for confirming what I personally believe as well, although that still makes me wonder why anyone bothered to do it to begin with (perhaps it just made them sleep better at night?).
We're already superfinishing our lifter faces after grinding. Similarly, our...
Does anyone have any empirical data about the benefits of putting oil drain holes in the side of a tappet body in an attempt to improve camshaft/tappet face lubrication?
This is for an OHV engine with a pushrod valvetrain. The tappets do not have pressurized oil feeds, they only receive...
Specific to the Triumph 4 cylinders and 6 cylinders, the tappets are dead flat (no crown) and the OE cams are ground with no taper. It is the offset in centerlines that provides the rotation, and as you noted the offset is not consistent in either direction or dimension.
Your camshaft grinder...
2-3 times engine capacity is absurdly large. We have had good luck with plenums 0.8-1.2x engine capacity. Attention to the transitions in each runner - proper radiusing - yields more in terms of flow than varying the displacement of the plenum by leaps and bounds.
The butterflies will behave fine, we have run supercharged systems (and turbo systems) configured with the butterfly after the compressor. There are even some factory setups with this turbo configuration.
Kai @ Wishbone Classics
http://www.wbclassics.com
What is the best method to lighten gears in production gearboxes? Drilling out material somewhere inbetween the shaft bore and the gear teeth? Cutting a groove along the same radius?
Any ideas, or concrete information / advise, would be appreciated.
Hey Greg, yes I realize that, and that is exactly my thought as well. The reason I ask the question is because the bearing supplier recommended to me that I should preload the bearing, this did not make sense to me as the original application was not set up this way...
Your opinion is always...
Is it necessary, or even a good idea, to apply a minimal load to clutch release bearings of the ball bearing variety?
Load would be induced by something like a 25# spring acting on the clutch lever (in the bellhousing).
Thanks.
Willeng,
Thanks for the info, much of what you said is already pretty well set in stone as far as racing Triumph engines... I just had not known the severity of the issue. I was more or less looking to see if there is some minimum standards for the amount of oil to the bearings.
While I...
What are the ideal oil pressures, or a way to calculate the ideal pressure, at particular points in the lubrication system? For example, what kind of pressure would be ideal for the rod bearings and main bearings?
I ask this because I recently read some information that reinforces what I...
As Rod stated, the Lucas starters tend to hammer off the ring gears... which on one of my TR6s was definitely the problem, as that car was solely used for street driving (back and forth to my office). All that hammering probably took its toll on the starter as well, because about 200 miles...
Fidanza flywheels, which I am a big fan of, produce their flywheels out of either 6061 T6 or 2024 T3 heat treated aluminium with a replacable carbon steel friction surface. They also do pin and bolt the ring gears into place. I have an MGB and a TR6 Fidanza flywheel sitting beside me as I...
The Graham Bell book is EXCELLENT! However, Corky's book are better for "quick reference" reading... when you only need to look up a formula quickly or need to find general information quickly. Grahams book is better digested by reading front to back entirely, in one sitting if...
