Sunday, November 27, 2011

Nissan GT-R Engine VR38DETT

The VR engine is a 3.8 L V6 piston engine from Nissan. The engine is the product of further development of the widely successful VQ engine series, in particular drawing experience from the JGTC racing engines as well as Nissan's VRH engines from vehicles such as the Nissan R390 GT1.


This 3.8L twin-turbo DOHC V6 engine is currently only used in the Nissan GT-R. Fully dressed with the first set of catalytic converters, turbos, turbo outlet pipes, the motor weighs 608 lb (276 kg). It is currently the only version of the VR engine in production.

The engine sports 24 valves controlled by dual overhead camshafts with variable valve timing (intake only). The block is cast aluminum with 0.15 mm (0.006 in) plasma-sprayed cylinder liner bores. The turbine housings for the two IHI turbochargers are integrated into the exhaust manifolds to decrease weight and bolster vehicle balance. The engine also sports a pressurized lubrication system controlled thermostatically.

The VR38DETT is hand assembled in a special clean-room environment at Nissan's Yokohama facility by specially trained technicians. Each engine is assembled by only one master technician("Takumi").

Other pertinent features of the VR38DETT include:

-Continuously Variable Valve Timing Control System (CVTCS) on intake valves
-Aluminum cylinder block with high-endurance/low-friction plasma-sprayed bores
-Nissan Direct Ignition System
-Iridium-tipped spark plugs
-Electronic drive-by-wire throttle
-Pressurized lubrication system with thermostatically controlled cooling and magnesium oil sump
-Fully symmetrical dual intake and low back-pressure exhaust system
-Secondary air intake system to rapidly heat catalysts to peak cleaning efficiency
-50 State LEV2/ULEV


Ok, now is the question, where do the owner of this GT-R in Malaysia source their engine gasket?

Friday, November 25, 2011

Cork Rubber Gasket

A gasket material that comprised of cork binded together with an elastomer. It is manufactured by combining the cork, glycerine-glue, and a rubber binder under heat and pressure (usually 70% cork to 30% binder). The elastomers are added to provide sealability and chemical compatibility while helping to resist fungus, acid and weather conditions. Cork rubber sheet material is cost effective, good for low-bolt load applications, light weight, long shelf life, easy to handle, less sticking to flanges, resistant to fluid penetration, absorbs vibration and has low thermal conductivity. This style of gasket material is commonly used in automotive applications such as oil pan, valve cover and timing gear cover gaskets because of its good suitability in oil. It should not be used in strong alkaline and acid conditions because it will be chemically attacked and the cork particles will degrade. Cork rubber material comes in a wide variety of elastomers, such as EPDM, Natural Rubber, Synthetic Rubber, Neoprene and Nitrile, to best suit the chemical resistance requirement of the gasket.

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Friday, November 11, 2011

Kia Picanto and Hyundai Atos 1.1 Cylinder Head Gasket

The Hyundai Atos (also known as Atoz, Amica and Santro Xing) is a city car produced by Hyundai. The original Atos was introduced in 1997. In 1999, it was joined by the less controversially styled Atos Prime. It uses the G4HC Epsilon straight-4 engine. The second generation Atos Prime was launched in 2004. It comes with a 1086 cc G4HG engine.

The Kia Picanto, known as the Kia Morning in South Korea and Chile, Kia EuroStar in Taiwan, Kia New Morning in Vietnam and the Naza Suria or Naza Picanto in Malaysia, is a low cost city car produced by Kia Motors.

The Picanto and the Atos 1.1 share the same engine code of G4HG, and their cylinder head gasket material is metal, but it seem they have some minor difference between them.

As show on the photo, they type A cylinder head gasket have an extra long hole when compare with the type B, normally, we assume that the gasket with those extra hole can be use on the other model which is less hole, hence, the type A should be can use for A and B but type B can only use for B but not A.

But actually it is not the case in this G4HG engine, a foreman came forward with the type B use sample, and holding the type A new gasket, mention that type A is unable to install on type B and must use back the type B design for it.

Sunday, November 6, 2011

Kia Carnival Engine Conversion to Nissan VQ25DE Engine

It is quite usual to heard about the engine problem on Kia Carnival owner, it is not known that is because the original KRV6 engine is design too complicated until it will get wrong easily if owner didn't maintain it probaly.

As the KRV6 is a 2.5 V6 engine, many of them had try to swap the engine to Nissan VQ25DE engine which it is also 2.5 V6 engine, I'm not going to compare both engine as I think it is very easy to find it online, just Google a bit. But putting a few photos on their cylinder head gasket and rocker cover gasket for viewing reference.

The above photo is the Nissan VQ series of engine cylinder head gasket design, while below are the Kia Carnival or Naza Ria for local Malaysia model cylinder head gasket.

Both of them are using metal gasket, Kia Carnival cylinder head gasket is thicker than the VQ series type, and for Kia Carnival, the left and right hand side of the cylinder head gasket is the same design but it is difference gasket for VQ type of engine.

The above rocker cover gasket shown the Nissan VQ series type of gasket, which is similar for most of the type of rubber type rocker cover gasket.

But you can see the below photo of Kia Carnival rocker cover gasket, their design is not like those convention rubber type of rocker cover gasket, it use 2 pieces of metal steel which coated with a kind of gasket material on it, both of them have a difference design for right hand and left hand side of the gasket.

There are few thing once may want to take note is VQ series engine is timing chain driven and KRV6 is timing belt driven, the KRV6 timing belt system is design as such they using quite a lot of oil seal and tensioner bearing once you want to replace it.