gmail invites all gone

Only on certain shite cars, like Fords. Volvo's on the other hand.... )

 

Aye, running at quite a lot higher compression than standard tho'. The
head's been skimmed. Means that power is up to petrol levels tho

 

Fortunately in the case of OVLOV's there are plenty of cylinder heads
lying around at the scrappers.

 

I didn't know about that, something to do with lack of additives?

 

A case of, if it'll run on unleaded, it'll run on gas?

 

Staganography, surely? Or are you planning to hire a typist and
play at Crown Court?

 

A simple case of good engine bad engine

 

I thought Nigel was hinting of problems specific to running gas, rather
than problems endemic with certain models and or makes.

 

No it only seems to a problem for some engine types running LPG

 

It was somewhere around Barstow, on the edge of the desert, when the

Steganography, shirley? Unless you're intent on shooting a blue movie
for a lot of does.

--

Dave

GS 850 x2 / SE 6a
SbS#6 DIAABTCOD#16 APOSTLE#6 FUB#3
FUB KotL OSOS#12? UKRMMA#19 COSOC#10

 

Let's split the difference and call it stqgqnogrqphy.

 

It was somewhere around Barstow, on the edge of the desert, when the

Franco-Spanish? Sounds good to me. We'll sell a mill... er.. one.

--

Dave

GS 850 x2 / SE 6a
SbS#6 DIAABTCOD#16 APOSTLE#6 FUB#3
FUB KotL OSOS#12? UKRMMA#19 COSOC#10

 

VOLVO offer lpg as a factory option. They're ecologically aware like that.
And sufficiently confident of the quality of their engineering.

SAAB have discovered that the Self Adjusting Turbo boost system they use on
their road going production cars gives 10% more bhp using LPG without any
modification.

 

ISTR that LPG is naturally very high octane - this is probably why more bhp.
Normally, LPG gives slightly less power and mpg.

 

In an engine optimised for 95RON.

It'll run a higher compression and more advanced igntion timing before
it starts to pink.

In a turbo, there is the flexibility to utilise the higher octane

 

What I thought.

 

There's more to it than that though - although LPG has an octane rating
equivalent to around 104 (allowing high compression ratios) the flame
front in LPG is slower than the flame front in petrol.

Therefore you need to advance the timing at idle and low revs, but just
advancing the distributor isn't the ideal way of doing it as at high
revs with full advance, the timing will be too advanced and knck shit
out of your piston. You really need a make a new timing curve - more
advance at low revs, and advancing more quickly than on petrol, to a
new maximum.

A good install will either supply a new distributor (for old fashioned
cars) or reprogram the ECU (usually leaving it switching back to the
old curves when running on petrol).

 

I have considered the twin ecu route but decided it's not really
necesary on a lower compression engine with a turbo and variable boost.

My LPG powered OVLOV runs fine on either fuel without any fancy
electronics (twin choke weber for petrol, simple vaporiser and non
stepper motor setup for gas).

I'd just like to get to a point with the V8 where it burns both
efficiently but without getting too fancy with the control systems.

SAAB have a system which varies the boost by measuring the ionisation in
the cylinder and backing off the advance a it just as it reaches the
point of pinking. The system is called APC and apparently it is fairly
'standalone'... I haven't had the chance to look into it yet, but I
think it consists of a fairly small pcb and a souped up anti knock
sensor.

 

Still badly argued, slightly incoherent "we want 1Gb storage for
free" stylee rant. Realised it was the same people and gave up.

 

My brain knows how to spell it, but my fingers don't always listen.