Hiclones

[Deleted account DD]

I Apparently she has access to a load ob black cabs?

I may be missing it on the new ebay layout but I cant see if theyre new or s/h

I presumed initially from the pic they were new but if theyre coming from old cabs i guess theyre s/h ?

 

[lacroupade]

Mr cynical :lol

Ok then.................how come my T2 recorded decent low emissions when they were in , higher when they were removed then back to the original lower when they went back in ie benchmark to test figure and return to benchmark :nenau
(same machine, same location same day all within the space of an hour or so )

All of which indicates with little room for debate , a cleaner burn as I've freely admitted I didnt have the car long enough to judge any different in the "feel" of it with or without them but a cleaner burn is a more efficient one so it doesnt matter whether I'm using less fuel per bhp or getting more bhp for the same fuel , what I am definitely getting is more bang per buck :clap (or per penny or yen for you uk jap vehicle drivers :augie)

Just out of interest you get voids and still areas on all airflows at all airflow speeds. Whilst aerodynamics supports the idea hi clones do move the airflow along at certain points I personally reckon they may impede it at others. Thats actually the only way I can reconcile the drop in power shown on some of their dyno tests theyve published (cant remember the link but I have posted it elsewhere on here)
However the lack of air/fuel movement may well be at a point where you dont notice it. A bit like when youre on that easy jet flight and the air flow outside is going daft but you dont notice it :thumb2

scowl scowl whinge...:lol

Could easily be down to the engine being different temperature at second test or some other variable?

As a creature of pure logic (and sex when required) I can only put forward the following:

1. This 'cleaner burn' is a bit of a moot point unless your engine is working inefficiently because of a fault...with fuel injection the burn is pretty complete anyway, and remember that unlike a petrol engine which requires ignition to spread from a spark, diesel explodes under its own pressure/temperature.

2. If it made that much difference to emissions surely you'd feel it at the wheel?

3. I'm still waiting for their mainstream success...ditto the science. But after several years...nothing. No motor manufacturer has used, recommended or otherwise referenced these things.....Merc did use a single vortex generator (rather more scientifically designed) on earlier petrol engines, but thats exactly where I did say they were designed to work and are proven. The whole point of fuel injection (which was developed after a lengthy project to investigate why even the best carbs in the world still couldn't prevent fuel atomisation from deteriorating between carb and cylinder) was to optimise fuel burn, so theres nothing left for these things to do on a modern engine.

The only science I do have on them (from an ex-Harwell scientist who worked 40-odd years in heat transfer/flow dynamics) is that at best, they impede airflow, as you would expect if you shoved a chopped-up coke can in your air inlet! :thumbs

Can you tell I just love a good Hiclone argument?! LOL

 

[Deleted account DD]

Could easily be down to the engine being different temperature at second test or some other variable?

Nope, oil temp via external thermometer near as damnit constant as was dashboard guage. :thumb2

Temp inside the building/ambient no discernible difference throughout and no difference recorded on the cars sensor

No other movement in the building than us two faffing on

1. This 'cleaner burn' is a bit of a moot point unless your engine is working inefficiently because of a fault...with fuel injection the burn is pretty complete anyway, and remember that unlike a petrol engine which requires ignition to spread from a spark, diesel explodes under its own pressure/temperature.

Yes and no but as hi clones claim to produce a more efficient burn with lower emmisions my measured experience matches the claim 100%. A vehicle does not have to be carrying a fault to produce varying levels of efficiency. No vehicle of this type and age is 100% efficient under all conditions. Many parts of its performance are a compromise.

All measurements were easily within MOT parameters except the lower with the hiclones which actually went off the healthy end of the scale :thumb2

I know Jocky (currently away) experienced similar on his T2 and what he told me about was the reason for my test. I find it unbelievable that my T2 is defective or carrying a problem or my measurers equipment are all identically defective to the same levels and produce identical results :thumb2

Therefore on balance of probability, or even heading towards a certainty the hi clones are responsible.

2. If it made that much difference to emissions surely you'd feel it at the wheel?

No idea but as I didnt drive the vehicle for long or under sufficiently varied conditions to be able to make a comment, as I've said previously. Therefore the activities above, which are far more precise were carried out

3. I'm still waiting for their mainstream success...ditto the science. But after several years...nothing. No motor manufacturer has used, recommended or otherwise referenced these things.....Merc did use a single vortex generator (rather more scientifically designed) on earlier petrol engines, but thats exactly where I did say they were designed to work and are proven. The whole point of fuel injection (which was developed after a lengthy project to investigate why even the best carbs in the world still couldn't prevent fuel atomisation from deteriorating between carb and cylinder) was to optimise fuel burn, so theres nothing left for these things to do on a modern engine.

Same with a lot of things.........acetone and svo perhaps ? :augie

The only science I do have on them (from an ex-Harwell scientist who worked 40-odd years in heat transfer/flow dynamics) is that at best, they impede airflow, as you would expect if you shoved a chopped-up coke can in your air inlet! :thumbs

As he is a scientist who presumably worked on theories...............

Whereas I achieved a consistantly clean burn , excellent mpg and a sprightly vehicle with a measured reduction in pollutants :thumb2

 

[Deleted account DD]

Now these I would be susp of. They are described as vortex generators and do look like a deformed coke can.

Theyve actually closed down part of the airflow :nenau

 

[dsgrnmcm]

Looks a bit mean / blue peter, the hiclone has a center cross and 4 blades, which seems more areodynamic, where did u get that from?

 

[Deleted account DD]

Looks a bit mean / blue peter, the hiclone has a center cross and 4 blades, which seems more areodynamic, where did u get that from?

Its off an ebay listing. I was looking for other stuff for the new car and that popped up.

I agree with you at least the hi clone looks like it'd work

 

[mont]

hyclones

Hi just taken a pair of genuen hyclones from my t2, open to offers

 

[Deleted account DD]

Hi just taken a pair of genuen hyclones from my t2, open to offers

me too, and they dont fit my loverrlllyyy jeep so theres room for a bit of haggling here for potential hi clone owners

 

[Hilltop]

Hi-clone

i've asked this before, will the anti swirl valve fitted to the 3 litre torrano engine act as an anti Hiclone valve and why is it fitted by Nissan, Now if I removed the anti swirl valve would it have the same efect as a hiclone and if not why not ??


Bob (GW0FJE)

 

[Deleted account DD]

i've asked this before, will the anti swirl valve fitted to the 3 litre torrano engine act as an anti Hiclone valve and why is it fitted by Nissan, Now if I removed the anti swirl valve would it have the same efect as a hiclone and if not why not ??


Bob (GW0FJE)

Ask Hi clone, could be interesting :thumb2

 

[Hilltop]

Ask Hi clone, could be interesting :thumb2

It would be more interesting to ask Nissan why they need a clean airflow at the inlet valves, and then ask hi-clone for their opinion.


Bob (GW0FJE)

 

[Deleted account DD]

It would be more interesting to ask Nissan why they need a clean airflow at the inlet valves, and then ask hi-clone for their opinion.


Bob (GW0FJE)

As part of the process yes, but as a starter for 10 and the chance of a quicker answer ask hi clone to explain why they would (if its listed for that model) want to change what the manf see's as the best option.

Unless the inside of the manifold is polished to hell and "aerodynamically designed" I cant see it being a clean airflow in there anyway (back to the 1980's argument of to port or not to port) I would speculate that in common with a lot of "vehicle design features" it was an oh shit add on. (think allegro square steering wheel or 1980's sierra window vanes)

The sierra is actually a good comparison. They found they were too aerodynamic across the back hatch and there wasnt enough down force on the back of the car at speed. As this was well into production they couldnt redesign so if you look at 87 88 ish sierra hatches you'll see a vane to the rear of the rear 1/4 lights. Those 6 inch bits of rubber plays a crucial part in helping keep the car stable & on the road

Perhaps nissan found that they were getting fuel starvation on the inlet side and a some brainy enquiries showed the mixture wasnt going in the right direction at the right volume so it needed a hand ? or perhaps even the nissan engineer of the day was anti hi clone type theory and held views and the sway to manf the polar opposite? I dont know.

The monsters of aerodynamic engineering , aircraft, have devices in different spots along the fuselage to smooth airflow then a bit further along something to disrupt it. Its all swings and roundabouts.

Still comes back to one point though that the (very good) question about the three litre doesnt knock off its top spot.

No one on a T2 that I am aware of has said theirs didnt work as well with the hi clones in. Some say there car worked better. Other like me arent sure but do know that it produced a better burn :thumb2

Ps trust me I'm thick skinned enough to cough if I thought I'd fitted junk and they didnt do a thing theyd have gone to trading standards or back for a refund / testing