12 replies to this topic

[Dusky]

Hi guys!

 

Having too much spare time, I'm reading up on cylinder heads.

Now I cam across this : Power lynz grooves.

 

I've seen this, or similar things being used on some italian racers years ago. But why hasn't it been used on a mini?

Reading up on it seems like there are no adverse effects? 

Better fuel mixing should give better economy and torque. Its a bit like a golf ball.
It won't really improve top bhp etc, but more on the torque and economy side of things. Atleast that's what I conclude reading about it.

Happy to hear your thoughts!

[matty...]

The main problem I could see with this on an A series head, is that it is cast Iron and very brittle so having something like that in the inlet ports, there could be a risk of something breaking off an going into a cylinder.

[Dusky]

The main problem I could see with this on an A series head, is that it is cast Iron and very brittle so having something like that in the inlet ports, there could be a risk of something breaking off an going into a cylinder.

Hmm, how would it break? Its a bit like a normal thread in a hole, and the threads in our blocks don't break?

[nicklouse]

That is why the Mini ports are not polished but left with a degree of roughness.

[Dusky]

That is why the Mini ports are not polished but left with a degree of roughness.

any specific reason this isnt used tho? As it seems to gain over a standard rough finish (atleast from what I read)

[Icey]

If it was a magical wand that when waved over an engine improved fuel efficiency and power output in any significant way I'd expect to see it on every car rolling off the production line.

 

That it isn't in any OEMed (or at least not that I've seen) suggests that it isn't as successful as it's made out to be.

 

So the positives are that it would increase tumbling in the intake track but there must be a downside? Well you've increased the surface area, that's not good for two reasons that come to mind - heat transfer into the intake charge and wall wetting (X-Tau in EFI), maybe they erode any/all benefits.

[Dusky]

If it was a magical wand that when waved over an engine improved fuel efficiency and power output in any significant way I'd expect to see it on every car rolling off the production line.

 

That it isn't in any OEMed (or at least not that I've seen) suggests that it isn't as successful as it's made out to be.

 

So the positives are that it would increase tumbling in the intake track but there must be a downside? Well you've increased the surface area, that's not good for two reasons that come to mind - heat transfer into the intake charge and wall wetting (X-Tau in EFI), maybe they erode any/all benefits.

Thats something I was thinking about too.

Though, you can improve almost every head that rolls off the production line, and it isn't done because it would cost too mch .. 

I'm still waiting for someone to get some dyno figures off this, maybe vizard tried it? 

Very tempted to try it on my own head to be honest

[Alex_B]

Cost would also be prohibitive, getting that machined into the head would take time and effort thus lots of money, and would there be a considerable improvement over an unmachined surface? Possibly but is that improvement worth the cost? Unless you are in a motorsport formula where everything is there to maximise efficiency then you may do it but otherwise it's likely not worth the effort.

[nicklouse]

it also has the potention to reduce the size of the port. as these features could increase the thickness of the boundary layer. and may actually do nothing.

it is something that if were going to be introduced would need extensive testing and analysis.

[timmy850]

If it was a magical wand that when waved over an engine improved fuel efficiency and power output in any significant way I'd expect to see it on every car rolling off the production line.

 

That it isn't in any OEMed (or at least not that I've seen) suggests that it isn't as successful as it's made out to be.

 

So the positives are that it would increase tumbling in the intake track but there must be a downside? Well you've increased the surface area, that's not good for two reasons that come to mind - heat transfer into the intake charge and wall wetting (X-Tau in EFI), maybe they erode any/all benefits.

If you look into F1 and most other motorsports they have OEM funding but much more development and one-off machining for optimum performance. If they still don't do it it mustn't give a decent return in performance. (Either that or it is banned)

 

 

 

That is why the Mini ports are not polished but left with a degree of roughness.

any specific reason this isnt used tho? As it seems to gain over a standard rough finish (atleast from what I read)

 

A polished cylinder head will perform similar to a highly polished and waxed painted surface. The liquid will form droplets as it passes over the surface and cause bigger droplets. This isn't good for getting fuel into an engine. 

[Dusky]

 

If it was a magical wand that when waved over an engine improved fuel efficiency and power output in any significant way I'd expect to see it on every car rolling off the production line.

 

That it isn't in any OEMed (or at least not that I've seen) suggests that it isn't as successful as it's made out to be.

 

So the positives are that it would increase tumbling in the intake track but there must be a downside? Well you've increased the surface area, that's not good for two reasons that come to mind - heat transfer into the intake charge and wall wetting (X-Tau in EFI), maybe they erode any/all benefits.

If you look into F1 and most other motorsports they have OEM funding but much more development and one-off machining for optimum performance. If they still don't do it it mustn't give a decent return in performance. (Either that or it is banned)

 

 

 

 

That is why the Mini ports are not polished but left with a degree of roughness.

any specific reason this isnt used tho? As it seems to gain over a standard rough finish (atleast from what I read)

 

A polished cylinder head will perform similar to a highly polished and waxed painted surface. The liquid will form droplets as it passes over the surface and cause bigger droplets. This isn't good for getting fuel into an engine. 

 

I meant, any reason why this ( the power linz) isn't used  
And on 1 of the (supposingly) F1 heads ive foudn there are 'grooves' though not so deep in the ports http://i150.photobuc...zps778b858b.jpg

 

But as you say, a lot is banned in F1 too ( sadly), it slike watching bumblebees now..  

[mini13]

cant see any grooves there, just normal smoothing.

[Icey]

cant see any grooves there, just normal smoothing.

I agree, looks like normally machining marks to me.