Pull Type Blow

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Pull Type Blow
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Since 1994, both GReddy and HKS have been creating aftermarket blow off valves for turbo car tuners. Although they essentially do the same work and complete the same task, there are many differences between the GReddy Type RS BOV and the HKS SSQV BOV. Each have their own set of advantages and disadvantages; however, many turbo tuners trying to decide between the two blow off valves always seem to be torn on which on they should buy.

To help out the decision of which one to buy, here is how the GReddy BOV and HKS BOV compare with each other, in both the BOV sound and performance.

BOV Sound

To many people, the sound of the blow off valve is the most important part. When they cruise down the street, they want to be able to shift and have the sound effect enhance the look and quality of their customizations, so having a quality blow off valve sound can really catch people's attention and make a statement.

The GReddy Type RS BOV releases its extra air pressure slowly, causing it to sound like air blowing. There really isn't a loud sound, rather a subtle burst of air, which sounds exactly like air coming out of an air compressor. For many people, this just isn't "cool" since it isn't loud; however, sometimes staying "low key" isn't exactly a bad thing, especially when you are driving on cop infested streets.

On the other hand, the HKS SSQV BOV can actually be three different sounds. You can either have no insert, a three arm insert, or a circular insert, which goes in front of the blow off valve's release port of the valve. Leaving the inserts out allows you to have a quite sound, like the GReddy Type RS BOV has, while putting in either insert will allow you to have two very distinct and performance BOV sounds.

BOV Performance

The two blow off valves perform very differently, even though they complete the exact same task. The GReddy Type RS BOV works with a "push" valve, which allows the air extra air pressure to simply push out of the valve, once it reaches the valves threshold. This design is used in many blow off valves; however, it does leave the possibility of the valve leaking and giving a slow release.

The HKS SSQV BOV is designed completely different, as HKS wanted to design a "pull" valve system, which uses two valves and alternating pressures to pull open valves, in order to release excess pressure. This system is highly effective, as it prevents any leaking and gives off one solid burst of air releasing, as soon as the valve does open.

Overall the HKS SSQV BOV seems to have more features and to be a better overall product, but the GReddy Type RS BOV continues to be popular to turbo car tuners, since it is made by such a well respected company.

For more information and full length articles on the two blow off valves, please visit the GReddy Type RS [http://www.turboaddict.com/greddy-bov-type-s-rs-rz-r-blow-off-valve/] BOV and the HKS Type RS [http://www.turboaddict.com/hks-bov-hks-ssqv-bov-blow-off-valve/] BOV articles on TurboAddict, which is a website containing turbo cars, racing videos, latest news, product reviews, and everything else related to turbo cars and automotive racing.

Glass Blowing

Glass blowing is a glass-forming technique which deals with molten glass inflation.

Glass blowing can be done by using a blowpipe or blowtube.

Glass Blowing Method:

- Free-blowing

This method deals with the blowing of short air puffs into a glass portion which is gathered at one blowpipe end. This results in having an elastic skin on both walls of the glass which is easier to shape.

One of the best blowpipes for free blowing is the clay pipe. As a tool, it is easy to handle, manipulate and is practical. One of the best techniques created was applied while making Portland Vase. It is a mixture of blue and white overlaying glass.

- Mold-blowing

This method is also based on the free blowing method. The difference is that the shape of the glass is mold dependent. It involves molten glass inflated into a wooden or metal carved mold.

There are two types of mold: single-piece mold and multi-piece mold. The single piece mold means the vessel is removed by one pull movement. Single piece mold is effective for vessels and tableware pieces.

On the other hand, multi piece mold means vessel is molded in a multi paneled type. This would allow for creation of more complex designs and texture glass objects. One good example is the roman leaf beaker displayed in a museum.

Three furnaces of glass blowing:

• furnace contains a crucible of molten glass
• glory hole for reheating
• lehr or annealer for slow cooling

Glassblower's Workstation

The glassblower's bench is his workstation. It is where he sits, and places his tools. It is also where two rails function as pipe holder while the blower works with the piece. It can be made from steel and hardwood. Others are welded tubular steel with redwood bench seat.

Other manufacturers offer benches with ergonomic support that facilitates gaffer operations. This is to lessen strain and discomfort. Some also include detachable tool trays.

The bench top measures five 5 feet long and thirty inches deep. It should be non flammable with a back shield. It should be flat and smooth surfaced. It should be sturdy since it is where the burner sits.

The marver table is where the molten glass is rolled. Traditionally, it used to be a flat slab of marble. Now it's made of thick flat steel. Some marver tables are custom made depending on user's dimensions.

Nowadays market offers so many aids or work tools and devices. Some of these include: pipe turners, pipe coolers, heat shields, choppers and yokes.

Glass Blowing As a Science

Glass is a mixture of soda, lime, sand and heat. The main components are natural ingredients. The process it goes thru is scientific and temperature applied is measured.

It becomes a science when one wants to be professional with complex glass apparatus and glass systems. Some scientific devices created are glow tubes, filament lamps and thermionic devices.

Glass Blowing As an Art

When the blowing procedure takes place in the glass making process, it becomes an art. Some say scientific glass blowing techniques are applicable to the artistic one. This involves off hand creations of colored glasses.

Safety Tips on Glass Blowing

• The use of heavy welding gloves and the proper tools can protect one from severe burn and pain.

• Practice makes perfect.

• Electric furnace is better than gas furnace. It is controllable, quieter and environment friendly. However it is more expensive.

• Glass blowing lessons should be taught by a professional.

• It is advisable to use safety glasses or goggles to protect the eyes.

• It takes patience to learn the craft.

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Question about words used in Ireland...?

This is all specifically regarding residents of Co Mayo:

The evening meal - what is it called - supper, dinner, etc?

What are diapers (the disposable things put on a baby's bottom) called?

Regarding time... in Ireland, would you say quarter of five, five forty-five, either, or something else?

In the US, typical rooms in a house include: living room, dining room, kitchen, bedrooms, bathroom. Are there different or colloquial terms for these rooms in Ireland?

The blow up mattresses people keep for guests - what are they called in Ireland? We call them air beds in the US. Also, do you call the cot-type beds that pull out from under another bed trundles or something else?

Thanks in advance!

Hi ya! I'm living in Cork so I think I'm qualified to answer this one! Basically an evening meal would be "dinner", diapers are known as "nappies", we use quarter to and quarter past/half past etc with time, all the house rooms are exactly the same, and a blow up mattress is a blow up mattress and the cot-type bed you pull out from under another bed is called "a pull out bed". Despite people thinking we sit on toadstools with fishing rods, it couldn't be further from the truth!

Great Britain strikes gold in search for perfect Olympic excuse | Harry Pearson
Government cuts in public funding mean our athletes can fail at London 2012 and not worry too much about it Either I'm starting to go bald, or my hair is getting pinker. Anyway, never mind that. I'm sure, like me, you received news that cuts in public funding could jeopardise Great Britain's chances of winning medals in 2012 with a mixture of relief and punch-the-air joy. Because, let's be ...

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