LPg and snorkle?

[barnhill4x4]

I have recently fitted a mantec snorkle to me 3.5efi with drawthough single point LPG.
  I have faced the intake backwards to avoid Ram Air, I have no running probs at all with it fitted apart from it using about 30% more gas!
  If I take the front of the airbox off effectivley bypassing the snorkle my fuel consumption is back to norm.
   Is this normal?

[Ralph]

Try facing the top fowards. Rear facing could be causing a vacuum in the snorkle on overrun effectivly sucking gas back up the snorkle.
If the ram air effect causes problems you will have to use a round top.

[solihull-mick]

The problem your having is the airflow or ram effect down the snorkle will open you air flow senser thus fooding the engine, as the last thread suggests try facing the snorkle rearwards, or out of the airflow somehow

[Range Rover Blues]

Forget all this ram air nonsense, the physical length of the air intake is causing a slightly higher vacuum at the LPG collar so it's running rich.  All I do is remove the front plate of the filter if I'd not expecting to go swimming and it runs a treat.

[solihull-mick]

Forget all this ram air nonsense, the physical length of the air intake is causing a slightly higher vacuum at the LPG collar so it's running rich.  All I do is remove the front plate of the filter if I'd not expecting to go swimming and it runs a treat.

As  matter of fact i can say by moving the snorkle rearfacing, a mates disco runs fine, forward facing and the airflow meter resistance goes mad when you reach 50mph or so, But im sure we are all adults on so thats the last from me on this subject, belive what you will :lol:

[Ralph]

Forget all this ram air nonsense, the physical length of the air intake is causing a slightly higher vacuum at the LPG collar so it's running rich.  All I do is remove the front plate of the filter if I'd not expecting to go swimming and it runs a treat.

No nonsense, actual fact.




There are a lot of fools about

[Range Rover Blues]

Oh, right then :roll:

[barnhill4x4]

The snorkle is facing back, I put it on like that to stop ram air as I realised this was bad for LPG, I suppose the vacuum theory makes sence. So in effect, when the engine isn't burning the fuel it is being sucked the wrong way out of the intake?
  I think I will just do as RRB suggests and keep the cover off unless I need it.
  I never would have though it would make that much difference to the consumption but now I understand how. Thanks

[jjsaul]

at least its cleared up...i will be running lpg/snorkel soon  :lol: