12a N/A LPG ??

[antnicuk]

i live in the south east, everytime i go up north, it always cheaper.   The cheapest i paid so far is 38p when i went to morrisons in rotherham.  I got it for 42 on a motorway in staffordshire last week.  On the motorways near here it 49.9..

[metalhead]

Hey mate,

LPG is great on rotaries, as you know, I\'m selling that Gas Research setup, but I\'m selling it to go to an lpg injection setup.  You can make more power from lpg, especially in a forced induction environment than petrol as its octane level is higher, allowing leaner mixtures, more timing, and/or more boost.  The main problem with lpg is that it doesn\'t have the cooling properties that petrol does so you have to make sure your cooling system is up to scratch, but that is not normally a major issue.  Secondly, contrary to what is on here, you actually inject less oil into the chamber when running lpg, as the dry gaseous fuel does not wash it away as much as petrol does.  Also note that as lpg doesn\'t have the cooling properties of petrol, running the car rich doesn\'t help keep it cool, it can actually make it run hotter.

My car should have comfortably at least 250rwkw @ around 15psi on our Aussie low reading dynos.  Lpg is good for this power and more, however over here once you go above about 500 flywheel hp you have to go to twin tanks as the excess flow valves fitted to the tanks stop them flowing enough gas.  Not sure if this is just an Australia only thing though.

Lpg is the answer I believe as a street fuel.  Cheaper and makes more power safer.  Wheres the lose?  The only negative is finding someone sufficiently experienced to tune a high powered lpg rotary (which fortunately I have covered).

[shaunwil]

Sorry i didn\'t get back to you over the carb, still very intested. As you said its finding somebody to tune the car on lpg. The conversion doesn\'t scare me and i think pip would be interested in getting his tuning hands on it !

Shaun

[oldone]

Just wont smell right.....:2Rolleyes

[mattmaclennan]

I think it\'s a fantastic idea. I was thinking of running it in a few years when I do my final bid for freedom and drive round europe to avoid settling down with the misses! I\'ve always liked the idea of running LPG and N2O as a auxillary fuel on boost. Just the EGT to worry about!

[shaunwil]

Right im bumping this back to the top. Been doing alot of reading. Still unsure what kit to buy. Metalhead im not sure if im a fan of the gas research stuff, really like the look of these :

http://www.gotpropane.com/p4.html

Should make a nice clean setup if they fit to the standard intake manifold.

Shaun

[metalhead]

Hey mate, the gas research stuff is really good, especially for forced induction, but yeh, could look a little strange in an n/a engine bay I suppose.  They are a much better design if you want some boost later though, as traditional carbs are quite restrictive.  It really depends on what you\'re after.

[shaunwil]

I\'ve finally ordered a open loop system for the 7. Im going to start with a simple system and then build up towards a straight gas setup because this is my daily driver and can\'t risk pulling the car off the road !

There was some interesting threads on rx7 club and the carb setups are alot harder to setup in a sort space of time.

Shaun

[shaunwil]

I\'ve finally got the kit through from tinley tech. They seem extremely helpful and not too expensive for a full kit. I\'ve got some issues with the mixer and i\'ve had to send my spare air filter can off to them so that they can work out what will work best.

I\'ve got a 47l toridional tank, all the gas lines, the filler nozzle, the electrics, the fuel cutoff solinoid, the gas cutoff solinoid, the Vapouriser, all the coolant and lower pressure gas lines. Blimey there is alot of stuff to fit !

I think im going to have to drop the petrol tank to install the gas tank and fittings. The spare tyre well is over the back of the fuel tank. Looking at the workshop manual it doesn\'t look too hard. Going to try and do it over a weekend. I have a 8mm copper line to plumb in for the filler and a 6mm Copper line to plumb in for the main feed.

The vapouriser is huge. Its much bigger than the stuff i\'ve seen on ausrotary. I should be have more than enough capacity for now and the future (if a turbo project arises).

So far the Tank float has been installed in the tank and the gauge mounted to the assembly. Not much done really, more reading and planning !

Shaun

[RemarkLima]

Hi Shaun,

How are you getting on with this? I\'ve been reading around and it does seem like quite a good idea, you can get more power for less money... Seems good to me

I\'d be interested to hear your progress!

Also, does anyone know where you can get injection based kits rather than carbs?

[shaunwil]

I haven\'t got much further. I had to send my mixer back to tinley with my spare can and they remanufactured one to fit for free (i just paid postage). I need to start asap and will ideally be sorting some bits out this weekend. Im looking at getting the vapouriser and mixer fitted next.

I think the best place to look about lpg is still ausrotary. I don\'t think anybody has converted an fd. The best way with that is if one day they actually make something that replaces the injectors direct and is controlled like the injectors. Don\'t know if that exists yet !

Shaun

[shaunwil]

After the issue with the mixer and now some finer weather i\'e finally started to get some work actually done. I\'ve routed the coolant line so that the pipe running to the oil cooler firsts goes to the Vapouriser and then through the cooler, this only adds an extra coolant line for tidyness. (Era look away now)





Then I\'ve plumbed in the gas line solinoid to the vapouriser.

Then i cutout a hole for the low pressure line in my spare filter can (off engine i bought off kev) and siliconed the mixer and the line into the filter, cut the line to length and then installed the filter.



I think im going to need a second fuel line filter because i didn\'t realise that there are 2 main fuel lines !

Feels like I\'ve got a bit done, still abit more to do in the engine bay and then on to the boot, electronics and filler !

Shaun

[oldone]

:3Confused :xconfused :eek :confused: :2Rolleyes :Typing :spank

[shaunwil]

Surpisingly it doesn\'t look all that cluttered with the vapouriser and mixer installed in the engine bay !

Era I did say look away ! If the weather is like this next weekend (dry but cold) Im hopefully going to drop the petrol tank and install the LPG tank in the place of the spare wheel.

When the kit comes you think OMG theres so much to fit but its more a case of taking my time and doing things methodically.

I need another petrol solinoid because I didn\'t realise it was 2 main feeds, but other than that all i\'ll need is to get it inspected, have it rough tuned by the inspector then book it in to pips

Shaun

[shaunwil]

Well after the drive to work this morning I think i have a major problem with this setup. When i rev the car the engine bogs down at 4k and feels like i\'ve hit the limiter. I think its just not getting enough air into the carb and making it run way too rich. It looks like i may need to make the setup straight gas from the beginning. I have a full engine and aux as spares through buying an engine off kev so will have a look at fitting a PIR gas carb to the standard Inlet manifold.

Need to investigate the oil-metering too now that i may have to remove the stock carb ! Be interesting to see if i could bolt a LPG carb on top ?

Shaun