Truck modification has been increasingly popular nowadays. Heavy modification is not limited on cars you see on the streets everyday; it is very much applicable to rigs as well. However, why do people modify their cars? It does not take a genius to find out why people put accessories or change the original look of their trucks. It is very clear that modifying trucks or SUVs mainly fall on two reasons: beautification and improvement of performance.

There are many ways to improve your automobiles. There are parts and accessories that can really help you increase the functionality of your vehicles. However, not everything may be available to the kind of vehicle that you have. There will always be an appropriate part or accessory for every kind of SUV. All of these items allow you to change the interiors to make it more comfortable while you are traveling. You can also add parts on the exterior to make your vehicle heavy duty. However, in changing the way your vehicle looks, you will still have to question whether if it is solely for looks, performance or both.

Some people really want to make their car to be loud that it can turn the heads of many people as it passes by through the streets. The loudness does not only come from the sound system that you have installed. Your SUVs can be a real head turner right from the colors of the paint you choose right down to the Tuff Country lift kits you have installed. Whatever you do with you them, just as long as you have monster trucks, it will really be attractive for many people. Therefore, most of the modifications for looks always end up making the truck look bigger than usual.

While others are concerned on how their trucks or SUVs can look like, some people are concerned with performance. It is undeniable that if you use your trucks or SUVs for work or traveling, you will definitely opt for accessories that will make them withstand the different factors that could affect the speed that they have. Modifications made on engines, break linings, tires and the chassis can be done to enhance the performance of the vehicle. Honestly speaking, this may be more expensive compared to adapting a change for the looks alone. However, if it is a necessity, it is worth the investment. You can do anything with it just to be more efficient and comfortable as you travel for work or pleasure. You know that your vehicles will stand tall no matter how uneven the surface of the road that you will be traveling.

Everyone can have their trucks or SUVs modified as early as the first time that they purchased it. You will have an option to change their color, make it more comfortable, or even make it bigger through installation of Tuff Country lift kits. To have the best modification for your vehicle, ask yourself, why you want that change. What you put in them can really improve the way it looks or improve their performance.

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Multi-chamber IV bag has two categories: fluid multi-chamber IV bag and fluid-powder multi-chamber IV bag. It’s defined as the separate storage of different medicine in different sub-chambers by weldingduring production, storage and transportation. In application, the separate sub-chambers are connected by external forces, and the contents are mixed. Multi-chamber IV bag is mainly used for the contents that are unstable after mixing, and can not guarantee long term storage. This article analyzes the testing of two key factors for multi-chamber IV bags: welding and barrier property.

1.The Analysis and Testing of Welding Strength

For the welding strength of multi-chamber IV bag, its convenience, safety and protection for isolated contents during storage and transportation must be maintained. Therefore, multi-chamber welding process control is the key procedure in the whole production. Welding is determined by three indexes: temperature, time and pressure. Multi-chamber IV bags, to achieve safe storage and transportation as well as easy clinical operation, can only maintain a mediate welding strength, which is also called heat seal strength. How to control this index successfully is a focus for multi-chamber IV bag manufacturers.

Labthink HST-H3 Heat Seal Tester and XLW (PC) Auto Tensile Tester are the professional testers for multi-chamber IV bag and its indexes. When testing the finished multi-chamber IV bags, a specimen of the welding place is prepared. This specimen can be automatically tested after clamping and pressing the ‘heat seal’ button on XLW (PC). Besides, for the proper welding strength, the manufacturer needs to make researches on temperature, time and pressure. HST-H3 Heat Seal Tester can be applied with the auto tensile tester for the best heat seal temperature, time and pressure indexes.

2.The Analysis and Testing of Barrier

Barrier property is the most important factor affecting the quality of fluid and fluid-powder multi-chamber IV bags. Owing to the low barrier property of the content contact package, a barrier package is needed for prevention of oxygen and moisture permeation. Besides, nitrogen is applied to take place of the air between the inner package and barrier package. Therefore, oxygen transmission as well as nitrogen and moisture transmission should be tested. Labthink VAC-V series of differential pressure gas permeation testers can accomplish relevant testing.

The application of multi-chamber IV bags is the great development of IV bags. As the most strictly required package for medicine, its tensile strength, elongation, heat seal strength, puncture performance of film and closure and seal property all need to be tested. Labthink, as the excellent provider of testing instruments and services, has been providing most excellent and thorough quality control solutions for the global medical industry. Labthink is willing to have more communication and cooperation will pharmaceutical companies and institutions

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One of the most important factors in engine building is determining your engine s final compression ratio. Compression ratio (C/R) has far reaching effects on the performance of any internal combustion engine. If the C/R is too low, you'll have a real dog on your hands. Too high and you won't be able to run pump gas without incurring pre-ignition and destructive detonation. Ignore the C/R and you could be in for a very unpleasant surprise.

First we'll identify and define the components necessary for completion of a formula that determines C/R. You'll need each one of the bold type measurements to accurately determine your C/R. For this example, we'll use a 1970 Ford 385 Series 460 with 78cc cylinder head combustion chambers. For your engine, substitute the measurements from your components. With most engines, all specifications are available from your shop manual. All measurements are in inches.
#
D - BLOCK DECK HEIGHT = 10.322
#
H - COMPRESSION HEIGHT = 1.76
# L - CONNECTING ROD LENGTH = 6.605
# S - STROKE = 3.85
# T - CRANK THROW = 1.925 (1/2 OF STROKE)
# d - DECK CLEARANCE = 0.032

DECK CLEARANCE CALCULATION: Compression height (1.760) + connecting

rod length (6.605) + crank throw (1.925) = 10.290

Block deck, 10.322, minus 10.290 = 0.032 deck clearance

This calculation uses a standard dished 460 piston with a dish size of 12cc. If your pistons have valve relief cuts (eyebrows), dishes or domes, that must be included in the calculation as a cc measurement. Any piston manufacturer can provide this information and the piston compression height.

Cylinder bore 4.360

Head gasket compressed thickness is 0.040
Head gasket bore size is 4.460

Now that we have all the required measurements, we can put them into a formula that will give us the exact C/R for this engine:

Compression ratio = S.V. (swept volume)

----- + 1

C.V. (clearance volume)

Since most of are do-it-yourselfers and not engineers, we ll do it the easy way and go to one of the websites that allows us to enter our measurements and instantly calculates the actual C/R:

These are the actual measurements required for the suggested automated calculator on this application:

Bore: 4.360

Stroke: 3.85

Cylinder head volume: 78cc

Deck height clearance: 0.032

Head gasket bore: 4.460

Compressed head gasket thickness: 0.040

Piston dish: 12.1cc

Final compression ratio = 9.959:1

As you can see, thanks to Internet access, determining your actual compression ratio is no longer a task best left to machinists and engineers. This will help you to put your dollars to the best usage in building an engine.

I suggest utilizing one of the software programs currently available to determine what C/R is best for your engine combination. When you input all your engine's various components into the program, it takes the guesswork out of what C/R you should run by showing 'what if' results in torque and horsepower graphs. Then you can adjust your C/R with deck height, pistons, bore and stroke to fit your cam, ignition, and fuel delivery and exhaust systems.

Suggested Compression Ratios for Street Driven Engines

Anything under about 9.0:1 will not provide the most efficient engine and, naturally aspirated, is dog country.

With cast iron heads, 9.0-9.3:1 is considered the maximum C/R for regular (87 octane) pump gasoline.

10.5:1 is about maximum for today's premium (91-94 octane) pump gasoline with a cast iron head. And that's assuming you keep the rpms up without lugging the engine, you've cleaned up the combustion chambers of sharp edges and rough spots to reduce the possibility of pre-ignition and use a zero deck clearance, or close to it, to enhance quench.

Aluminum heads will generally allow 11.5:1 C/R on premium pump gasoline, again assuming you have clean combustion chambers and a zero deck clearance.

If you run A/C, take .5 off the maximums.

Note: This information is intended for usage in the calculation of internal combustion engine compression ratios and the author makes no claims as to its accuracy or warranties its usage by any individual or company other than the author.

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