Just got a Email of JBS saying there cast manifolds are now out on the market
Good Afternoon,
It has been a long time coming, but the time is finally hereâ¦
Straight from the burning fires of the forge comes JBS Auto Designâs K04 Cast Manifold!
We very much appreciate your patience over these last few months and as promised, we are contacting everyone who has made previous enquiries about this manifold, and will be offering a
10% discount off the RRP!
The price of our K04 Manifold to you lucky select few will be
£405 inc vat.
The manifold will not be available for general sale until 3 days after this email has been sent. This should allow everyone who expressed a prior interest to get their order in before new orders start to pile up.
When you place your order you will receive the following items:
- JBS K04 Cast Manifold
- 3 Bolts and 3 Washers
- Manifold to head gasket
- Manifold to turbo gasket
As it has been such a long time and just in case you have forgotten, here is some information on the K04 Manifold:
From what JBS has learnt from the development of the K03, the design process for the new K04 OEM performance upgrade manifold became a lot simpler.
Casting the new manifold gives better quality mass production and for such a constraint bound design as the K04 manifold, casting gives fewer constraints on the pipe bend radius, allowing the runner to flow freely. The most obvious improvement over the standard cast manifold being the increase in bore (diameter) of the runners all the way into the collector.
Like the new K03 design, the manifold has been designed in CAD to optimise the design, flow capabilities and to enable easier fitment. The CAD process allows the designers at JBS to manipulate the part quickly, while allowing information and measurements to be taken easily.
JBS K04 SPEC
The main work has taken place increasing the diameter of the runners all the way to the collector and the design of the collector to achieve best flow. The manifold has been designed to have maximum material around the bolt holes to prevent cracking, found on the OEM and competitors manifolds. The collector design also separates the runners to reduce port sharing of combusted gasses, aiming them towards the turbine in the turbo.
The box collector features cooling fins to minimise the effects of EGTâs on the manifold, preventing the manifold from warping and causing thermal fatigue.
Fitment of the manifold was also a large considerationand the area around the head studs and nuts was maximised to enable fitment.
The cylinder head flange uses the same design as the K03 to allow greater thermal expansion and movement between the runners. It has been found that a restrictive flange forces stresses back through the runners of the manifold which can lead to crack propagation.
Recently there has been a lot of talk about performance manifolds cracking due to poor design, weak materials and the stress the manifolds are under due to high exhaust gas temperatures. We are confident in the design of the new manifolds due to the hours spent on CFD (computational fluid dynamics) analysis and prototyping.
To ensure the manifolds donât suffer from poor material choice and casting quality, we have chosen to cast these manifolds in a very high quality foundry which is used by many OEM turbo suppliers and OEM vehicle manufacturers such as BMW and GMC. This will ensure the castings are of the highest quality.
Also to reflect the high quality casting, we have spent a great deal of time researching the latest high temperature resistant cast irons. These cast irons have high nickel content and having the following properties makes them ideal for our performance manifolds: resistance to corrosion, resistance to oxidisation and high temperatures (up to 1050 â°C) and a resistance to wear and erosion. This ensures a minimal amount of thermal expansion and an equal rate of thermal expansion to the turbo housing. This again minimises the potential for thermal fatigue or cracking. The bolts required for the fitment of the turbo to the manifold are also supplied, as they are a specific size and made of a material to prevent stretching which can lead to blowing gaskets.
We wish to thank you for your patience once again and welcome any questions or queries you may have.
I look forward to hearing from you in the near future.
Kind Regards,
Jonny Close
Customer Relations Manager
