A buddy of mine built a custom twin turbo Lexus LS400. He put together a custom methenol injection kit that comes in at a certain boost into the intake pipe. It's like a NOS setup, but is legal and is on at all times. Has anyone tried this? Is it safe to run in a rotary? What do you guess think?

 

https://www.rx7club.com/forum/showth...ater+injection

Yup, ZeroBanger uses 1/2 water & 1/2 alcahol(type unknown)

 

The new thing ive heard of and read about is propane injection... it might only be in a theorized state at this point though.

 

they use propane injection on diesel powered motors. Propane is like n02 to them.

 

no actually there was a website with several Supras running propane injection. Although it is more popular for diesals it can be used on rotories.
I want to convert to 100% propane, 110 octane! woohoo!

 

Hank Hill would love you for that.

 

My old mechanic had a rotary pickup that ran on propane and was supercharged. If the truck wasn't in such bad shape it would have been an awesome daily driver.

 

Actually, the main reason for running alcohol it to keep the injection unit from freezing in the winter. Any performance gain is secondary. If you were running big enough jets it didn't make much difference. Detonation is the enemy and water/alcohol work good at stoping it.

 

Yes, it's fine, it chills the mix, and contributes high octane fuel and oxygen, but contributes fewer BTU than gasoline during combustion, but it's useful for chilling intake charge for turbo and high-compression. Each are is similar in cooling effect, octane rating, and fuel pricing, but I consider the apparatus for LPG as more advanced with slight problems in regional availabilty of the fuel.

 

Water is a better benefit than methanol.

Methanol is a fuel and thus can detonate.

Water is NOT a fuel, it does absorb some heat in the intake tract but the main benefit is that it disrupts and smooths out the combustion process, similar to high octane fuel but much, much cheaper.

cpa7man has it right on the head - methanol is just a Necessary Evil to prevent freezing. You see better results with straight water, if you're sure that it will never freeze.

edit: There is additional theory that as the water absorbs heat in the combustion process, it *adds* power because flashing to steam causes it to expand on the order of 1800:1. More push!

 

Have a read of thishttp://www.autospeed.com/cms/A_0115/article.html It's a very interesting article.

"While I have referred to 'water' injection, many systems add a 50/50 mix of water and methanol, or water and methylated spirits. Research carried out during World War II indicated that pure water is best at suppressing detonation, while a 50/50 mixture of water and methanol permits the greatest power output before detonation occurs."

"This means that if water injection is used without any changes made to the tuning of the engine, improvements in power are possible but not probable. However, if the engine air/fuel ratio is leaned out, or boost is increased, or the ignition timing is advanced, more power is very likely. Supercharged aircraft engines using water injection had mechanisms that leaned out the air/fuel ratio simultaneously with the operation of the water injection."