Daily Archives: October 25, 2019

I had a trip to the Lab Rat Keeper

I keep wanting to add “and the Feed” to headlines like that, except I don’t do that any more. Any bike wrecks I see online are incidental these days, instead of being the result of a deliberate search.

Anywho I gained 5 pounds since Mrs. the Poet’s return, and we may have figured out why I’ve had high blood pressure since I was a kid. Way back in 2002 I had to get my BP under control for an operation, so calcium channel blockers were prescribed and they did what can only be described as a “bang up job”. Also one of the identifying characteristics for my other condition is a high blood calcium reading that leads to the extreme bone density, which in my case is something between “concrete bridge support” and “actual rock”. I think I might have mentioned getting tested for this by a guy studying the condition, and that one of the things tested for was blood calcium level and that mine was in the range that defined the condition but he didn’t tell me the exact reading. Which is typical of doctors they run tests and say it indicates this or that but they never give me the actual numbers unless I press them on the subject.

So, next trip I’m going to bring up the subject with the Lab Rat Keeper and see if we might get some other kind of treatment for my hypertension, to go with the current diuretic. The guy studying the super thing said that diuretics are part of the standard treatment for the condition to prevent kidney stones. I need to bring the blood calcium levels and calcium channel blockers up because this could be a key to why I still have high blood pressure.

As for the other “stuff” I found out that the 4.8l crank and rods in 6.0l and larger LS blocks is popular for building higher RPM middle-displacement engines to run on 87 octane. The theory is the longer dwell at TDC gets a more complete burn and more expansion of the burned gasses with less spark advance to heat up the combustion chamber and cause detonation or pre-ignition, and has been proven to generate more power per pound of fuel burned. That’s a fuel economy thing, moving the car the same speed with less fuel, but it also is a performance thing. I guess it also would work with a standard stroke LS (3.622″) with shorter piston compression height and longer rods, but the effect is amplified with the 3.26″ stroke and 6.275″ rods from the 4.8l engine because there is a limit to how short a compression height you can get imposed by the separation between the second ring and the oil control ring on the piston. The oil ring can intersect the piston pin location, but that is as high as you can go and still have a functional engine with current piston ring technology. Also the increased rod ratio (rod length/stroke) of 1.932 for the 4.8l crank and rods means significantly less piston wear from side loads regardless of the RPM range and still allows the use of standard pistons for the size block chosen. As a point of comparison the 383 SBC has a rod ratio of 1.52 with stock SBC rods, and the 350 SBC has a rod ratio of 1.638. This is a substantial improvement for the 4.8l crank and rods. I’ll have to do “something” to bring the compression ratio back up after installing the 4.8l crank and rods reduces the displacement of the cylinder compared to the original crank and rods. “Something” in this case is reducing the combustion chamber volume by the same ratio as the change in displacement from the 3.622″ crank to the 3.26″ or about 11%. That’s a major change in volume, for the smallest factory LS head that would be more than 6cc (6.829). That’s a large cut to the head combined with a thin head gasket to get the combustion volume to the point that the same place it was before the crank change. I guess I can live with the 11.3:1 with the stock heads and the 0.027″ compressed height Cometic composite (not MLS) head gasket.

Well that’s enough rambling about a fantasy engine, time to put this post to bed and eat the dinner Mrs. the Poet has been working on. Oh yeah they just announced that the total number of twisters that hit the area on Sunday was 10 as they found another damage track in an unpopulated part of the area.