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- #81
Oh I really like that you are talking to me of compression ratios!!! haha.. I am restraining the motor head in me who would want to ask you for a shot of your engine haha.. Oh and do you have a pet name for your motor? I do not think any Chev motor was set as high as 10.5? Or did you achieve this yourselves? You are certainly in the expert league I think!! Here unfortunately fuel price is a major problem which is a shame and has dampened the enthusiasm I used to see.. you know petrol (gasoline) prices here in north London are £1.35 per litre and which is about $8/gal equivalent and so we can scarce afford to waste it. I drive mine only when I am in a condition that can only be alleviated by speed Otherwise I have to surf the tube. Your offroader ratios are incredible too though I should think you need it with those big big tires?The TA was built primarily as a street car, so we wanted the flatest torque curve possible. If it were primarily a race car, it would have gotten less static compression and more boost. Currently, the static CR is 10.5:1 and it gets 9lbs of boost at the manifold (12lbs before the intercooler). For a purely race engine, I'd have gone with a static CR of 7 or 8:1 and 18-20lbs of boost.
All three are built around strokers for the low end torque. The offroaders especially, since you don't need high RPM power offroad. They're crawling... especially the Jeep. With the Atlas 4-speed transfer case, you get a 1:1 highway gear, a 2:1 low range (which is roughly what a factory 4x4 will have), a 5:1 crawler gear, and by engaging the 2:1 and the 5:1 you get a 10:1 superlow range. It's impossible to go fast, but at 5:1 or 10:1 with 5:13 gears in the differentials, it will crawl up pretty much anything.
I think relearning is faster than learning, but you certainly lose things when you're inactive.
The term cattleboat is certainly not complimentary... There are a large number of divers who, while certified, might only do one or two dives a year. Or less. And there are shops that specialize in taking large groups of these relatively unskilled and unpracticed divers out to shallow, low- or no-current reefs. A lot of these divers are doing what is known as a resort course or discover SCUBA course. These folks are not even certified. They're given an hour or two of very minimal training in a pool and then taken out (paired with an instructor, with no more than a 4:1 ratio) for a dive experience. 20-30 means a crowded reef. And since they're not very practiced, their bouyancy and trim is lacking. That means they bang into and kick the reef. That's not good for it. Reefs are quite fragile.
The best thing I can say about the cattle boat operators is that since they all go to the same easy sites, it keeps the crowds (and the reef damage) away from other sites.
While I'm not at all a fan of cattle boats, I am a fan of those discover SCUBA courses. They give people a chance to experience the underwater world without the expense of certification. I just don't think they should be done from cattle boats.
Our own addiction to diving came about in a fairly typical way, I think. We were in Cancun and took the ferry over to Cozumel one day to ride the Atlantis. This is a submarine which takes passengers down to a max of 100 feet. We thought it was cool, but you couldn't exactly see things up close from inside the sub. So we took a trip on something called a BOB. With these things, you sit on something like a stationary bike with your head in a big plastic bubble. They're neutrally bouyant at about 25 feet, so they sink to that level and stay there. They have an electric motor so you can scoot around. Better, but still not enough. So we took a resort course, with no cattle boat involved. A small boat with the captain, the instructor (who stressed the importance of bouyancy control from the first instant) my wife and me. A site that was NOT filled with a crowd of divers. Instant addiction. We're definately 'vacation divers', since Colorado isn't excactly a Mecca for divers, but even so we did about 75 dives in our first year certified.
Regarding the diving, it is obvious there too that you have considerable expertise. Can I ask have you ever suffered any ill effects or problems from diving? Or have you ever had to help anyone who did? I think diving can be a risk and that is why instructors must be well trained? Also, reefs are classed as living organisms? They are not rock outcrops with underwater plants growing on?
I very much appreciate you taking the time to elaborate on your expertise and skills. I find it fascinating to learn of these things.