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[TheBoy]

Won't it detect lean running, an pop back to petrol?

No - it only monitors the vapour pressure so if that pressure is not able to deliver enough fuel through the injectors...

Drill the injectors out more if it does?

I think we're at the max. at 3mm. Then again, according to the documentation that's supposed to be good for more than 200 BHP @ 1 BAR.  :-/

Kevin

Can the injectors take more - ie, just a case of new brass bits (presumably both ends - injector and manifold), or new injectors?

Or is the whole thing some kind of flaw with the vapouriser?

[Lazydocker]

Won't it detect lean running, an pop back to petrol?

No - it only monitors the vapour pressure so if that pressure is not able to deliver enough fuel through the injectors...

Drill the injectors out more if it does?

I think we're at the max. at 3mm. Then again, according to the documentation that's supposed to be good for more than 200 BHP @ 1 BAR.  :-/

Kevin

Can the injectors take more - ie, just a case of new brass bits (presumably both ends - injector and manifold), or new injectors?

Or is the whole thing some kind of flaw with the vapouriser?

I've offered to try out a new type of injector for him, which is supposed to be more responsive. At present I'm getting "Injectors Fully Open at WOT" but it's staying rich (high voltage) Teilo Did say that he feels the software is a little anal about it

The trouble with the injectors is that they are effectively an electronically operated valve, which opens against the flow of the LPG, hence increasing the pressure wasn't the answer

As it stands at the moment I've got settings I am much happier with and I'm going to see how it behaves over the next couple of tank fulls before fettling again

[Kevin Wood]

The injectors are actually specced to 4.5 BAR so, I must admit, I'm wondering why there's so much trouble with them at 1.25 BAR.

Kevin

[Lazydocker]

The injectors are actually specced to 4.5 BAR so, I must admit, I'm wondering why there's so much trouble with them at 1.25 BAR.

Kevin

He said that although they are specced higher (I asked the same question!) it's really a Max pressure and they seem to work better at lower pressure and they're also very noisy at high pressure.

It certainly seems to run a lkot more sweetly now at a lower pressure and, although I did manage to get some lag yesterday, I was giving really "giving it large"

He's talking about trialling some Matrix style injectors, which are a metal flap instead of a "Valve" (or something like that) which are more responsive

[Kevin Wood]

The injectors are actually specced to 4.5 BAR so, I must admit, I'm wondering why there's so much trouble with them at 1.25 BAR.

Kevin

He said that although they are specced higher (I asked the same question!) it's really a Max pressure and they seem to work better at lower pressure and they're also very noisy at high pressure.

It certainly seems to run a lkot more sweetly now at a lower pressure and, although I did manage to get some lag yesterday, I was giving really "giving it large"

He's talking about trialling some Matrix style injectors, which are a metal flap instead of a "Valve" (or something like that) which are more responsive

Will be interesting to see how they fair. Open/close time on those Valkek injectors is a bit lazy. With 3.3ms opening time and 2.2 ms closing time they aren't well suited to 6K rpm use, TBH. (you have 20ms between power strokes at 6000 RPM)

It also doesn't say at what pressure the open / close times are specified.

Maybe the best way is just to set the pressure so they end up "fully open" from about 5.5k RPM onwards. Then it's not an issue, as long as the engine doesn't go lean.

Kevin

[Lazydocker]

Maybe the best way is just to set the pressure so they end up "fully open" from about 5.5k RPM onwards. Then it's not an issue, as long as the engine doesn't go lean.

Kevin

Exactly how mine is currently set. Like I said, he did comment that the software is a little anal about it

[Marks DTM Calib]

Kin ell, those injectors are a bit naff......I must admit, they always did look like they had been recovered from used washing machines....

[Lazydocker]

Kin ell, those injectors are a bit naff......I must admit, they always did look like they had been recovered from used washing machines....

Yep... Still don't think LPG systems have been perfected and Dual Fuel is always going to be a compromise as the timing needs to be so different for LPG compared to Petrol

[Kevin Wood]

For comparison, a petrol injector, driven properly, will have sub-1ms open/close times.

Kevin

[Martin_1962]

The Romano injectors are plastic and use a flap so are supposed to be quicker and quieter.

They are also OK to use without a filter.

But they do not like going over 2 bar