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Knife edging cranks - pros / cons. Discuss
Knife edged cranks. Pros vs cons What are the pros and cons of having your crank knife edged? No idea but I'd be interested to know too I'd guess that the lightening of the crank will make it freer revving but may leave it exposed to cracking or something similar. Knife edge removes weight and cuts through the oil easier causing less resistance and making it rev smoother.
Dont think there are any cons? Apparently back in the good old days of the 'cossies,' they used to get around another 18bhp by knife edging their cranks. I don't know if it would shorten the life of the engine or any of it's components but I would also like to know more.
Originally Posted by Jeremy I'd guess there must be reliability cons or they'd come knife edged from the factory unless the cost made them prohibitive. Originally Posted by Algie.
knife edged crank for daily driving
I think cost is the only problem. Norris said once that they're only really useful when you're going for mega power, but I can't remember what that figure was I think it was bhp back when it wasn't so "common". I'll dig out Bells books and see what he says on them for starters, There must be some opinions out there.
I could definately feel the engine was much keener to rev and less 'harsh' at high revs. Basically on a standard car the reason they aren't knife edged is because they are still road cars. When you put your foot down, that's a different story.
Your not to concerned about getting max mpg when your trying to get the most power but manufacturers of road cars are Not having lightened parts means they can quote figures like 30mpg for motorway use on a bhp car. The cost of knife edging components is time consuming which leads to expense.
Oh and knifing a crank helps on ANY car. People get them for mini's and the improvements in acceleration are there, so don't be fooled into thinking you have to have bhp magic figure before it you get any return. Every component helps up the figure, as it's a cumalative affect. If your spending thousands on getting a rebuild it's worth doing, and whilst your there yoy may want to check out cross drilling of the crank as well to help oil flow.
IIRC, Ferrari knife edge all their cranks and they don't seem to have much of a reliability issue. There won't be any issues, the momentum is all one way and the out extremities are lighter which means less stress A knife edge doesn't normally mean you actually have a crank with that thin an edge, bust means it's tapered towards the tip They should obviously rebalance it for you as with any worked crank. Originally Posted by Stu. Originally Posted by Scougar. So it appears that the overall feeling is that it's worth having one fitted.
I'll add it to my shopping list. Originally Posted by bren.Taonga lock stone
Hes talking about the parasitic losses of the crank having to plough its way through the oil mist in the bottom end of the engine. Make the crank more streamline and you suffer less parasitic loss. Sounds good if nothing else. Last Jump to page:.Log in Sign up. Share With Us. Knife-edge Pros Cons.
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Our PurseForum community is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker. Thank you! My boyfriend would like us to pick out my engagement ring together. I am looking at a classic round stone but some sites talk about a "knife edge". Do any of you like the knife edge?
What are the pros and cons? Jun 29, 6, Posts.
The classic Tiffany ring is a knife edge. I love the look because the diamond stands out more in my opinion than with a regular band, its also a very pretty look on your finger. Then again its a harder engagement ring to get a wedding band for, Tiffany has a knife edge matching band, but then my band won't match my fiance's when we're married. I would try on some bands and see what you like for you.
LV Rawks. Jun 9, 4, Posts. I love the look of the knife band, but I have read that some find it uncomfortable with a matching band. Try it on and see what you think, I really love the look myself. Mar 3, 1, Posts.
Jan 11, 1, Posts. For me, I prefer the "comfort fit" rounded rings over the knife edge--especially for jewelry I'll be wearing every day.
May 8, 1, Posts. After wearing a half-round comfort band for 18 years, I recently had my e-ring reset into a knife-edge and like it very much. It's very pretty and comfortable to wear as well. Also I think it's a flattering setting for a diamond.
It enhances its beauty and the look is classic.Bad Behavior has blocked access attempts in the last 7 days. Welcome, Guest. Please login or register. Did you miss your activation email? I did alot of searching through older threads but never found any definitive pros and cons to lightening your crankshaft. I like the idea of shaving some weight from the engine but are there any effects of doing this and the bike revving quicker? Just looking for some examples.
Also is this only beneficial if you also have other parts installed or is it all good on just about any engine with some kind of rev limiter. Sweep Just remember there are no stupid questions, just some idiot asking them. Hot Shot Posts: For what it costs I wouldn't even think about it unless maximizing every other part of the motor, including exhaust and carb. My crank in combination with Carillos rods does rev the motor quicker but will run sustain RPMs higher than stock.
I haven't run many sustained RPMs yet because I can barely hang on. I'm working on getting the brakes and suspension caught up. Posts: 11, K1, K2.
I think one big con would be the required increase in idle speed. An engine with a lighter crank will have to spin faster to keep from stalling because it doesn't generate as much rotational momentum.Birch burl bowl
Inigo Montoya Master Posts: 1, Another con would be less strength. While it may not be an issue, it could IF you took off to much material. Posts: 14, Today's Lesson: One good turn deserves another. RE: Idle and strength: In my mind Since we have a power pulse every deg, idle is no issue.
That's been my experience. My cc with lightened crank and rotor, was a very civil motor. Idled at stock rpms pr less. Had a big bump cam and later a stock cam. No dif in idle.Quick links. Username: Password: Remember me?
Please login or register an account. Board index Hardware Turntables and Tonearms. So, despite not being trapped, unipivots and knife edge bearings are functionally tighter than gimballed bearings, where the bottom bearing must support a significant amount of the downward force, which then must loosen the vertical bearings which must have some play in order to minimize friction.
Every choice in audio has some cost - unipivots have woggly behavior during cuing, which many people cannot abide, knife edges can be damaged, and gimball bearings can be loose, or alternately, so tight they can be damaged, or have high friction. Suspended floors and turntables are not going to put the bearing under much stress.
It may be that some knife edge bearings include some sort of protective restraining mechanism however a simple unrestrained knife edge requires very careful handing. I'm not knowledgeable enough to evaluate all the description, but that doesn't mean it's BS. It may be right, or it may be wrong, but I think it's a good faith attempt to explain damping. If there is a problem perhaps it is not with your arm being pulled or snake oil merits whatever they are but it may be with your understanding of the physics of tonearms.
Board index.Over the years we've handled and used thousands of knives. Because we know the hows and whys of various grinds, we understand the strengths and weaknesses of different profiles -- in short, we know which knife to reach for, depending on what we're up to. Sometimes we have to remind ourselves, though, that not everyone lives and breathes this stuff, and that the lingo we use might need translation.
That's why we've put together this primer on some common grinds you'll encounter in the knife world.Bulk editor
A flat grind that begins at the blade's spine is called a "full flat grind"; a "saber grind" begins its bevel lower on the blade; and a Scandinavian or "Scandi" grind begins lower still.
Technically, all are flat grinds. What you may not know: The flat grind is the simplest and most basic profile. It's easy to maintain, but it doesn't produce the most durable edge. For that reason, a knife with a true flat grind is relatively rare.
Most blades billed as having a "flat grind" actually have a secondary bevel. What it is: A double-bevel grind, also known as a "compound grind," can, in overall profile, incorporate virtually any other grind -- flat, hollow, convex -- with the addition of a secondary V-bevel to produce a cutting edge. Generally speaking, only the secondary bevel the one producing the cutting edge will require attention. What you may not know: The double-bevel or compound grind, in its many forms, is arguably the most common profile produced today.
It tends to be stronger and much more durable than a true flat grind. What it is: A hollow grind features symmetric, concave surfaces ending in a thin, extremely sharp edge. A hollow grind doesn't produce a very strong edge, and therefore generally isn't suitable for sustained use on hard or fibrous materials.
How to sharpen it: Traditionally, hollow-ground straight razors have been sharpened on leather strops, aided by abrasive stropping compound. Because a hollow-ground blade has the potential to be extraordinarily sharp, however, it can benefit greatly from stropping.Kde connect gnome
What you may not know: The concave surfaces of a hollow grind tend to draw the work against the blade and toward the edge before the flat surfaces higher on the blade push it away, which is why many knife lovers prefer this profile for slicing and skinning.
What it is: A chisel grind essentially is a V-bevel, except that only one side of the blade is sharpened while the other side remains straight like a wood chisel. What it's good for: Woodworking, food preparation. Also common on some military and "tactical" knives. How to sharpen it: Sharpen a chisel grind as you would any other V-bevel including by using a guided systemexcept that only one side of the blade is honed. It's advisable to lightly draw the opposite straight side of the edge across the hone occasionally, to remove any burr that may develop during sharpening.
Many Japanese culinary knives are produced with a chisel grind. What it is: On a convex grind, the sharp edge is produced by symmetric, gently curved surfaces. Where the curvature begins high or low on the blade can produce a full convex, a saber convex or even a Scandi convex grind.
Many knife aficionados consider a convex grind the strongest and most durable profile. What it's good for: Hunting, woodworking, food preparation, axes, general use. What you may not know: A practiced hand can sharpen a convex-ground knife on a hard surface or a flat stone.I've seen this mentioned in a thread or 2 on here as well as a few other forums online.
Can someone shed some light on this as to what benefits. Knife edged crank I've seen this mentioned in a thread or 2 on here as well as a few other forums online. Knife edged crank. Can someone shed some light on this as to what benefits could be expected from doing so? Obviously less mass in the rotating assembly is good, but how much can be expected?
The stock crank is right around lbs. What would be a realistic expectation in terms of a "goal weight"? I've seen the same warning that it could cause street drivability issues, similar to a lightweight flywheel, but as of right now, I'm just trying to figure what the pros and cons really are to be able to compare them. Has anyone done this? This platform or not, just looking for some real world experience.
Primarily for a race motor that spends a lot of time at peak revs. Doing this for a DD or non-competition motor will provide bragging rights only. SouthArkZRustySpooler and 3 others like this. Spooler and Whjaxn17 like this.
They use to do it for z L28 engines when they stroked them. They would use a Datsun crank out of a diesel Maxima and pair them with z rods with customer pistons.
The only problem is in a boosted application they would bend. Whjaxn17 likes this. Ok, no real benefit in a street car.Index of books
Got it. I was only thinking of having it done while having an engine apart to have it built and wondered if it would be worth it. Boost was obviously the reason for having it built, though, which runs me into the problem Spooler mentioned.
So, I guess long story short, scrap the idea of using a stock crank. I just knew I had seen people say they were good for hp, so I thought even after that, would still be safe. What about a billet crank? Would it be capable of holding the power minus the extra material?
How do they compare in terms of weight? This is strictly a street car for now, but I would eventually like to run the car in some half mile events such as TX2K or WannaGoFast once there is some more power in it.
Last edited by Whjaxn17; at AM.Apart from being a great space saver magnetic knife racks also offer the benefit of added hygiene. We are all used to seeing knife sets that are stored in the traditional knife blocks — right? These knife blocks are a breeding ground for bacteria and germs, and this is even more prevalent in the wooden knife blocks. Having your knives stored separately in an airy environment is one of the best ways to keep your knife rust and tarnish free as well as keeping the germs and bacteria at bay.
A magnetic knife holder is basically a knife holder that fixes to a wall or side units. It utilizes magnets to hold the knives in place, many of the popular magnetic knife rack types are formed in a rectangular design with 2 or 3 magnetic horizontal lines incorporated within the design. Many of the best Magnetic knife racks are manufacturing in both plastic, stainless steel, and even wood and can be easily mounted with screws to your desired surface.
The key to ensuring that your knives do not become damaged on a magnetic knife holder is in the removing and placing of the knife on the magnetic strip.Crankshaft Refurbishing
A slight pull and twist of the knife whilst holding the handle firmly is all that is needed when removing a knife from the rack. There are many styles and different varieties of magnet knife holders and each serve their own purpose in the kitchen. For the sake of argument I will focus on the popular 3 magnetic knife rack styles; plastic, stainless steel, and wood. Plastic: probably the most common magnetic knife rack style, these are very cheap to manufacture and come in many styles, colors, and shapes.
Harder to keep clean that the plastic of steel alternatives. In closing, I personally love magnetic knife racks or holders and think they are great for the modern kitchen. Are Magnetic Knife Racks Good? I will buy a few more for other rooms for my office, for my keys at the entry door and for my tools in the garage.
Your email address will not be published. The Pros and Cons. Magnetic Knife Rack Pros Space savers great for small kitchens.When camellia blooms download eng sub
Hygienic keeps bacteria and germs at bay. Magnetic knife racks protect knife edges from dulling. Helps to prolong the life of your knives. Convenient and handy hanging on the wall. Great way to show off your expensive knives. Magnetic Knife Rack Cons Dangerous if you have children and animals around Slight possibility of damaging knives when removing from the knife rack Knife racks may have negative Feng Shui.
Can you think of anymore? Aaron December 28, Leave a Reply Cancel reply Your email address will not be published.
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