Most liked posts in thread: Werkin Mini & Endyn

And here it comes! The latest CNC & hand blending headwork for the MINI from Endyn; smooth air pathway past the mid-size valve seats both coming and going.


It's a straight shot to the intake valves through this port. Endyn machines the valve guides to exacting tolerances. Endyn also shapes the guides to net minimal flow losses, while supporting the valve with as much length as factory guides.


CNC work ensures uniformity throughout.

 

The head photos shown bellow are of mdbsat's custom mid-size valve head. Unfortunately a recent dyno didn’t fit into his schedule; I’m sure he will update if he chooses to do a dyno later.

The program for this MSV head is completely new and incorporates knowledge gained from the latest generation ENDYN BVH and the features precision-machining capabilities can provide. There will be more about the precision machining later.

More photos of mbsat’s MSVH.
The deck


Note the intake ports are precisely equal


The genuine article

 

Here’s the precision machining involved in the new generation of MINI headwork from Endyn. http://www.werkinmini.com/ENDYN%20headwork.pdf

 

Yes, you have the right idea, a balanced systems approach. Matching the intake manifold to the head pays dividends when the head or IM has core shift causing a flow-limiting mismatch. If you intend to use the 8k-rpm end of the rev range, your header can benefit by having larger diameter primary tubes also (actually the header is matched to the head and intended use, not head to header). The average performance user can make do with OE size primaries up to 1.5 inch and huge tubes could be detrimental in that case. It’s all about defining your needs first; the selections from the head configuration menu will fall into place afterwards.

I have 65k-miles on my Endyn mid-size valve head. It’s performed well with a variety of tune states, and no matter the size of the pulley; it always has exhibited a fat mid-range. Up until two years ago, larger valves on the Endyn MINI head were limited to 1mm over on the exhaust and .5mm on the intake. The German market demanded larger valves, so Larry carved up a few heads to see if it could be done while retaining structural integrity, and the 32mm intake & 25.5mm exhaust valve head option was born. German users subjected the bigger valve heads to no-speed-limit roads & track use, deeming the huge valve head an enduring success.

Now enter the CNC era of Endyn heads, I just installed the first CNC MINI head on mdbsat’s car along with a port matched intake manifold, feedback to come.

 

Yes they do, more to come on the intake manifold.

 

Roller Wave Pistons from ENDYN & Werkin Mini

The head forms half the combustion chamber; the other half is defined by the piston’s top. The piston has a major role in the combustion process and deserves enhancement considerations. To this end Endyn created the Roller-Wave piston.



I visited Endyn in 2004 when Larry was designing the Roller-Wave piston for the MINI. There were 6 versions in the development process, each more robust than the one preceding it. Here is what Larry Widmer has to say about the pistons:

“In stock form, the piston top is so far beneath the head there is little or no interaction between the two shapes for promotion of inlet mixture motion, or combustion turbulence for a more thorough burn.

The design philosophy at Endyn has always been such that if we have the ability to affect greater engine performance and longevity by mechanically forcing the combustion event to occur uniformly rather than randomly, we should do it.
Simply put, we mechanically manipulate the combustion process to achieve every possible gain.

The Roller-Wave piston for the Mini was designed to increase airflow directivity at low valve lifts and the raised quench pads are designed to interface with those in the cylinder head to promote mixture turbulence, and increase the engine’s mechanical octane rating by increasing quench effectiveness. This allows the engine to operate with a higher static and dynamic compression ratio with a lower tendency for detonation, effectively increasing performance while widening the tuning window for the user.

If you are wondering why the original engine manufacturer designed and built the engines without incorporating such features, you need look no further than cost. It’s a lot less expensive to manufacture a simple symmetrically dished piston that one with features raised above the timing edge. You might also keep that in mind while looking at the simple generic-style pistons offered by other aftermarket manufacturers as well.â€

Werkin Mini also provides performance-coating services through Cradin Industries for those who want something extra. The pistons below have a ceramic coating on the crown, PTFE on the skirts, and an oil-dispersant on the underside.




Endyn has an in-house meticulous skirt coating service for a one-stop shop.

Endyn recommends Total Seal rings for its pistons, as they are the flattest and most accurate ground rings available.

Roller-Wave pistons and Total Seal rings for the MINI can be purchased from Werkin Mini; stock and oversize pistons $525 per set, rings $145.