Don Terrill’s Speed-Talk

Often a fuel flow restriction will not show up til the top end in high gear. My carbed car would quit at the 1200 foot mark, fine through the gears. As a stopgap measure it would go the full 1320 with a full tank of fuel. That was with the original 6 cylinder 5/16" fuel line.

I have no experience with a flathead, so am not really a good person to comment. I can only say acceleration is proportional to the square of rpm, and linear with stroke and piston weight. Shorter rod length has an influence. All of those cannot be large numbers on that engine.

It's reasonably do-able in todays age. The difficulty would be in the measuring of the block to make the model. Would you ever have some kind of factory block drawing? My dad sold his spare Champion engine. If the bolt pattern was symmetrical (that would be too much to ask) you could cut a scrap iro...

I have that stuff on my bench. The difficulty is getting the shape of the port right for the 3D model. But it seems pretty good for assessing head differences and it makes a reasonable comparison to a more conventional OHV. Showed some surprises.

Titanium E is ~16 x 10^^6, and steel is ~31 x 10^^6, so a Ti retainer will deflect about double that of a steel for the same dimensions.

Great article - and a mercury crank damper inside the crankcase!

One observation for the CFD proponents (and I am one, with qualifiers) is air fuel is 2 phase flow, and CFD for that is very limited in capability. I was involved in a 2 phase CFD development program on a practical example a few years ago, and found it essentially useless. To make the model run in a...

Reynolds number increases with velocity so flow is more turbulent with high velocity. H (heat transfer value) value also increases with velocity. They have it backwards.

Ti is very notch sensitive

Big block Mopar the stems are not lined up with the centre of the bore. I forget the exact number but it is a big one. Somewhere around .35" toward the plug side.

Always wondered why they moved the pierce points that far off.

https://tdmach.com/catalog/

The T&D catalog has listed info on a lot rocker pivot lengths. In there both BBC and BBF are listed at 1.650"

ATI has a lot of experience, but unfortunately there are a lot of factors and unfortunately they would not have as much AMC experience. I know at least a few years ago they had the equipment and did torsional vibration amplitude measurements which is a lot better than most aftermarket dampers who do...

The question cannot be correctly answered without understanding the effectiveness of the damper and is the engine operated in a range where a critcal crankshaft exciting order lines up with a crank torsional vibration mode. You will have rpm points where the excitation and modes do line up, the ques...

I have no experience with the LS7, but deal a fair amount with Titanium. Ti actually has a very low alpha (coefficient of thermal expansion) so it will grow a tiny bit looser at temp, but at this small diameter it will be extremely minor. Ti also has "surface properties unsuitable for a wear ap...

AMC is 18
BBD is 15