He does make Swedish plenums , I help Grieg out , the prototype was a 8 injector one and a one cossy one

 

 

From Grieg:

hi john
thanks for the email, im afriad we have only ever done a couple of prototype yb plenums and never produced them. so i cant really help you.
sorrry im not able to help.

regards greig

 

 

 

And the prototype on an engine

 

So why can't I buy one? Bit odd

 

And yes we make them !

 

What did you ask for ? He made a billet one the other week ? Unless it when we moved in to his new place

 

Perhaps I'll call next week. He may have been having an off day!

 

Just spoke to greig , you asked for a Yb plenum , you didn't ask for a Swedish plenum , lots of people ask for the prototype, he said its his mistake ! But you can buy one off the web shop if you wish , or Grieg will will email you later

 

Sorry Jon for the confusion

 

Here's another one we where working on lol

 

Ahhh! Bit of confusion! Will call him next week.

 

So are the plenum's available now proven in regards of equal air flow to each cylinder.

 

No, at the moment as we won't sell anything less we have proff it works , the Swedish both work and been tested on cars and the volume to each Cylinder is equal on both of them , will post a few up of how the Yb is coming on see what you think

 

Inside the Swedish

 

 

Already heard from him, thanks for your help!

 

 

This is what Grieg throught you wanted lol

 

I see the billet Swedish plenum weighs 5kgs. How is that weight supported? The AS/Hart plenum can break off unless supported. If it broke off on the inlet manifold it could be catastrophic for the engine.

 

The Swedish is billet the as is cast ,if you get a backfire in the cast it shatters , don't think you will shatter aircraft alloy billet my friend

 

surely those bosses will massively disrupt air flow causing turbulence and therefore making it worse than standard

 

he means the weight of it hung off the head with no support

 

This was my thinking when seen this am unsure on the idea of them

 

No mark , they equal the air in each cylinder,and to get over the firing order ,and on the flow on soildworks software not that many vortexes with the flow , and we have had no problem with any of Swedish that we have sold I know you know what your on about to do with plenum so do I , saw the one you did for Harvey , I personally I have along time looking in to this

 

i think there to run 4 more injectors ,but they shouldn't protrude in to in cover like that

 

so you havent had it on a flow bench with inlet sensors to gauge speed and flow
we are just doing some inlet work with a British super bike team and obstructions like that would be a big no no
surely you would equal air flow with the entry position and shape not with obstructions in the way

 

Yep that was the idea , but still have to finish it but the domes where in to make sure the air to each cylinder got the same amount of air

 

So it's like to disrupt the air flow going in as it normally heads for number cylinder causing it to go lean? Why do they go down in size?

 

The idea is to make sure you get the same air at the first cylinder and the 4 cylinder, and get over the firing order as the standard cossy plenum is restricted, no the best flow

 

I might draw one and flow it, just like the Swedish style the fow in CFD would surprise people.

I have CFDd a swedish design and they are pretty horrific.

If these have been tested in CFD then im sure the results would be available, yet nothing can be found.

Its ok having in idea on airflow, and in most cases you could be reasonably confident, but when you actually see the airflow its scary to see what you missed.

 

Carry on sir would like to see your results , we had to do a lot of work to get our focus plenum to work , with the trumpets , but got it right in the end

 

How does the focus plenum differ to these?

 

so what your doing then is restricting the air to some cylinders to compensate for the cylinders that dont get as much

 

Thankyou, that is exactly what I meant. 5kgs is blooming heavy, add fuel rail, throttle body and pull from hoses attached to inter cooler. That's a lot of pressure on the inlet manifold.

 

is that what the cover weighs 5 kg thats heavy

 

Yes mark , the focus is different as its a 5 pot and 3 and 5 airflow is poor on it , as was said before 5kg seem heavy but as said we've had no reported problems

 

I've just seen this on eBay is this the same idea as the Swedish inlet on here? Can't believe the price.
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