Thread: Hiclone thingy !!!

I have tried one on a 3.9 V8, with no discernable difference to economy or performance.I also tried it in two places,just before the throttle butterfly and half way along the tube between the MAF and butterfly.
I drove to Brisbane with it and back to Sydney without. Fuel economy was basically the same , and no difference to power.

I chucked mine away when I moved house.
However the theory is OK if the swirl is near the ports. The new Mercedes V6 petrol has retractable aerofoils in the inlet manifold near the ports which extend at low revs to give turbulence in the manifold.
I reckon if you had 8 little hiclones one in each trumpet, it could make a difference, but maybe not. And it would cut high rev performance.
Maybe on a diesel, if it sat just before the ports, it could help. There have been several dyno tests of diesels ( Japanese) in 4WD drive magazines that say an increase in power was seen.
regards Philip A

Originally Posted by isuzurover

Says who? I am quite sure that the extra pressure drop that hiclones create in the ducting mean that any improvement in the flow field (technical term for what the air stremlines look like) is COMPLETELY negated (or even detrimentally effected). Furthermore - I highly doubt that any changes they make to the flow field would be stable even for a short period of time. In most intakes (especially at high revs), the flow would be likely be turbulent, which would mean that 100% mixing of the air would occur, and a hiclone would do nothing other than obstruct flow.

And fitting them to a turbocharged engine is even further insanity.

As I said, it is the concept of a swirl which creates extra flow.
Just like swirling a bottle of water to empty it.

But as has been stated, there are bends/restrictions and the end result is squat.
I think we all agree
THEY DON'T WORK

Originally Posted by Ralf_the_RR

As I said, it is the concept of a swirl which creates extra flow.
Just like swirling a bottle of water to empty it.

But as has been stated, there are bends/restrictions and the end result is squat.
I think we all agree
THEY DON'T WORK

You swirl the bottle to reduce the vacuum forming inside the sealed container.

And intake is totally different...

And laws is laws.... Ya can only stuff so much air through X-dia pipework at Y-psi.... Swirling it wont do squat!

You want better economy on a 3.9l V8... Retrofit the tri-plenum D2 manifold, the longer runners increase torque and assist economy.

I have a 99 LS Disco 3.9 Auto, and can't get better than 16l/100 on the highway, and I would not work it out around town, cause if I did I wouldnt drive it.

I have retrofitted a Thor on my 3.9 and I really agree onthe more torque. with the Unichip and heads I have over 50% more "Tractive Effort" from idle up to 2000RPM or so.
But my economy has not improved.
Next project is to look at the A/F ratios by sticking an oxy sensor in the exhaust, and if possible have the Unichip tuned on road for economy.
If not possible I guess it may be Megasquirt!!! Did I say that?

My economy is about 13.5-14.5 at 110Kmh and 20-22 around Avoca, Terrigal which is pretty hilly.
Regards Philip A

driven nice my old 3.9 v8 disco used to hang around 14l/100 city and down to 11/12l 100 on the highway.

but I detuned here somewhat, and like to drive around at 90ish on the highway.

Blk Knight, tell me more what did you do to get that economy,was it an auto or manual. If I drive at 90 or 110 it doesnt seem to make a big difference.

I Drive from Charters Towers to Townsville once a week, a flat road, and can not get better than 16l/100 , no matter whether premium or standard, it does idle better on premium.
74000k, and I think it is in good knick. Any hints ?



regards Andrew

Draft a semi