Vehicle & Technical > Defender

Hiclone (anyone using them?)

<< < (3/4) > >>

Eeyore:
Not a huge amount different from what you'd get running it on petrol in general - a lot depends on how the gas is set up.

IIRC gas doesn't create quite the bang that petrol does (something to do with latant calorifc values, or somesuch) so power is slightly down, so gas systems are often tuned to hoy in a tad more gas and this can result in slightly lower MPG, but a half the price, no one genrally complains.

Now, I could be completely wrong on the above, it is recalled from the hazy days of having the Disco gassed. Sometime has passed....

Anyone with a better memory wanna comment?

cheers
 8)
Eeyore

Niel:

--- Quote from: "bovaboy" ---Couldn't quite ungerstand why you need a hiclone fitted before and after the turbo in a tdi (am I right in saying this, thats the impression I got) surely the airs gonna be a bit turbulent leaving the turbo anyway?

Doing a bit with fluid dynamics I think the one after actually improves things by stabilising the air flow, turbulance is the enemy of good flow, likewise laminar boundry attachment at the air/pipe interface also slows flow a bit like flow benching a racing head/manifold, polished actually reduces compared with flow over a fine ground surface, so the hyclones improve the first and disrupt the second where ever fitted, IMHO. How much difference it really makes is an open ended question, but I can understand how it might work.

Niel.
--- End quote ---

thermidorthelobster:

--- Quote from: "Eeyore" ---Not a huge amount different from what you'd get running it on petrol in general - a lot depends on how the gas is set up.
--- End quote ---

As always, I'm no expert, but the sequential LPG system I had on the Range Rover, once it was tuned properly, yielded very similar performance and economy on both LPG and Unleaded.  There really wasn't anything to tell the two.  I think you're right that LPG is less calorific though, so I guess there should always be some difference, even if it's imperceptible.

The 101 system changes the timing depending on what fuel's being used, and also the throttle settings, and as it's currently set up I think it runs *better* on LPG than Unleaded - idles better, more power, and I think also more economical (by volume - it's *much* more economical by price, naturally).

From my experiences with LPG so far, it seems to work well on simple installations with basic engines (like the 3.5v8), but less well on complex electronically-managed engines like the 4.6, but I may be doing it injustice.

Eeyore:
We're running a single point on a 3.9 efi and it works well. It took a few miles for the system to bed in and stop back firing, but it runs pretty much without a hitch now.

The multipoint (sequential, gas phased injection - whatever you want to call 'em) systems are more expensive (about double the price) andare a bit of a threb to get sorted, but once working go very well.

I've a friend that runs a Rangie with a 4.5 Dakar blueprint (approx 300bhp) with twin ecu sequential and it goes like a train, the power delivery is just awesome on both gas and petrol. And not a Hiclone is sight!

I would love that engine. <sigh>


cheers
 8)
Eeyore

Dave:
Don't they reduce engine braking as well. Let you motor run away down hill's not good i'm sure, so i've heard.

Navigation

[0] Message Index

[#] Next page

[*] Previous page