LPG in a 3rd gen Rx 7?
Discussion
Can it be done.
Someone has posted on PH saying that they've heard of someone doing it.
Any details.
First off the Rx7's huge thirst would make it an ideal car for gas.
And secondly LPG is actually higher octane than optimax which would be good for preventing pinking which is a disaster for rotaries.
Plus it burns very cleanly (well set up LPG cars report that when changing the oil it looks very clean when being taken out) which might have its advantages in a rotary.
I'm not talking about some dodgy manifold setup either, I would be thinking of replacing the stock fuel injectors with LPG injectors and then remapping the ECU to compensate. In this way you can keep 90% of the stock setup you just need a new map.
It would of course then only be able to run on LPG which would have its restrictions (no driving on the continent) but I could live with that.
Plus consider this.
My local sells LPG for 29.7p litre.
Super U is about 82 a litre.
That makes it 2.76 x as expensive.
If you take say, 17 mpg and multiply by 2.76:
you get 47mpg.
So you'd be getting the cost equivelant of 47mpg and higher octane.
Christ that would make it cheaper to run that my daily hack (1.4 litre 68hp)
Anyone know if it could be done.
What kind of setup does the efi on a R34b have anyway.
Andy
Someone has posted on PH saying that they've heard of someone doing it.
Any details.
First off the Rx7's huge thirst would make it an ideal car for gas.
And secondly LPG is actually higher octane than optimax which would be good for preventing pinking which is a disaster for rotaries.
Plus it burns very cleanly (well set up LPG cars report that when changing the oil it looks very clean when being taken out) which might have its advantages in a rotary.
I'm not talking about some dodgy manifold setup either, I would be thinking of replacing the stock fuel injectors with LPG injectors and then remapping the ECU to compensate. In this way you can keep 90% of the stock setup you just need a new map.
It would of course then only be able to run on LPG which would have its restrictions (no driving on the continent) but I could live with that.
Plus consider this.
My local sells LPG for 29.7p litre.
Super U is about 82 a litre.
That makes it 2.76 x as expensive.
If you take say, 17 mpg and multiply by 2.76:
you get 47mpg.
So you'd be getting the cost equivelant of 47mpg and higher octane.
Christ that would make it cheaper to run that my daily hack (1.4 litre 68hp)
Anyone know if it could be done.
What kind of setup does the efi on a R34b have anyway.
Andy
Honestly,I don't know enough about it to answer your question but I can't think of any reasons why it shouldn't work.Bl00dy hell!,if you can double your mileage & have a better octane fuel which will burn cleaner in your car,research,do your sums & go for it.
I would imagine a conversion would be under £2k,all in,judging from other gas convs I've heard of.
Kinda takes me to thinking that I should be doing the same with the 'liner.
I would imagine a conversion would be under £2k,all in,judging from other gas convs I've heard of.
Kinda takes me to thinking that I should be doing the same with the 'liner.
I know of a 2nd Gen (Turbo II) that's had the LPG conversion. Slight loss of power but not huge, obviously much cheaper to run. No clue if tere's a 3rd gen with it though.
One possible benefit of LPG would be the temps of the input - due to the expansion from liquid to gas it should be pretty cold and ny cooling on that side is good to lower the chance of detonation! One of the reasons that WI is a must for any seriously tuned rotary IMO!
One possible benefit of LPG would be the temps of the input - due to the expansion from liquid to gas it should be pretty cold and ny cooling on that side is good to lower the chance of detonation! One of the reasons that WI is a must for any seriously tuned rotary IMO!
flat_steve said:
Mainly because there is no place to put the tank!
Does the RX 7 have a spare wheel. If so thats one place a tank could go.
If you're converting to run on only gas (as opposed to dual fuel conversions) then you could take out the petrol tank and fit a gas tank there, although the packaging (fit) might be a problem.
Also what about the boot. Is it as bad as an MX 5's boot?
I've never been in an RX 7 but from the looks alone would dearly love to own one. But the huge fuel bills would put me off driving it, which would be a crying shame.
Andy
andytk said:
Can it be done.
Someone has posted on PH saying that they've heard of someone doing it.
Any details.
It may have been me who said I'd heard of it being done, over at the Mazda Rotary Club I remember rumours.
andytk said:
If you take say, 17 mpg
You'll have to be easy on the loud pedal to get 17, I used to get 13 on average, 14 at best on a long run and 9 at worst when thraping it.
Best of luck with the conversion, sounds like fun!
I am no expert on rotery engines but wouldn't the loss of the lubricants in petrol (preveously lead) cause more wear on the rotor seals?
I understand that in a normal engine the valve seats must be hardened (in engines not designed for unleaded) in order to run LPG due to the loss of lubrication.
I understand that in a normal engine the valve seats must be hardened (in engines not designed for unleaded) in order to run LPG due to the loss of lubrication.
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