Hello;

I am in starting project of converting my RX-7 to bi fuel (Gas and LPG) and i need few information to help me get started.

First of all i have to clear why this project got my attention:

1. LPG burns 100% so no carbon bulid up in rotors - longer life time of engine (seals...)
2. LPG is half price than petrol (1-3% of power loss to 45-50% mony save is woth of giving a chance since it is still possible to drive on gas whenever i wont)
3. No wory of not passing smoke test and than i can modifiy my exhaust system (cat removal)

But i need information such as:

1. LPG combustion temperature is around 300 degres celsius higher than gas combustios so will my rotor bear these temp rise?
2. As much as I understand there is amount of oil injected to fuel when engine is runing. Will closing the injctors cause problem with oil insertion or there is some other solution to these question?

Best regards
Uros

 

I've seen a few propane/LPG powered rotary setups over the years. The one that I was able to examine in detail was a "junkyard" setup.

Over here, most police cars, taxis and service vehicles run propane/LPG. Thus the owner of the RX-7 simply went to the junkyard and picked up the regulator, lines, tank, vaporizer and throttle body from one of these junked cars and installed it on his turbo 1st gen. Seemed to work well enough to make a bunch of low 12 second 1/4 mile runs.

The fuel injectors don't have any effect on the metering oil system so you don't need to worry about that.

You also really don't need to worry about higher combustion temps from what I've seen.

 

Aaron thank you very much for fast reply. I have also found on internet lot of information but they were all based on turbo conversion. What can be the difference beetwen converting turbo and NA to LPG?

Thx

 

I suspect it's the same for turbo and NA. You just need more fuel to run boost...

A person to ask might be Dan Atkins over at Atkins Rotary. They have a lot of experience running propane/LPG.