VICIOUS FISHER

I have been debating the use of propane injection, can anyone afford any insight into why or why not to use, the kits are available for about 700usd.
any thoughts?

matthais

propane is expencive! water meth is cheaper.

VICIOUS FISHER

great response, why....hp vs hp

CamperAndy

Water/Meth is infinitely more adjustable and can serve more then one purpose.

You can run straight water when towing to keep EGT's (with a HP bump to go with it) in check or you can add in Methanol for added HP. With the latest offerings from Cooling Mist or Snow you can make the flow progressive on Boost or EGT and you can adjust the flow rates on the fly. You can fill up most anywhere on both water or methanol.

johnh

i have a homemade propane unit,i like it and it works well

matthais

water meth adds timming so use in moderation.

Clayten

Look in the DTR classifieds you might find what you are looking for.

CamperAndy

Any fuel added via the intake air stream advances the timing.

lgp9999

I'm confused. How does it add timing?

CamperAndy

It contributes to pre ignition from compression. When the fuel is direct injected it is done at the point where ignition is desired. When a fuel source is added to the air stream it can/will auto ignite due to compression and could do it well in advance of the desired ignition point.

VICIOUS FISHER

So water/meth and propane have similar problems regarding pre-ignition? From what I have read, managed correctly propane could add 80-100 hp.

slowflyer2112

Sorry but this is not a 100% correct. Not all fuels will compression ignite in a diesel. If the fuel does not ignite it will start burning when the diesel starts to ignite it will not add any timing, but it will change the rate of the burn and if the rate is increased dramatically it will raise cylinder head pressure and increase combustion temperatures. One of the characteristics of diesel is its relatively slow combustion rate in comparison to gasoline. This is why most diesels are built with long strokes and run at lower RPMs to take advantage of this. It creates more power which we love so much

CamperAndy

Key words there.

CamperAndy

We are talking about propane and methanol, these will auto ignite with detrimental effect if used incorrectly.

RowJ

Pure propane or 100% Meth.....sure.
But Methanol mixed with 50% or more H2O, no evidence of same.
I've been running 50/50 mix for years, racing and towing in mountains, with no evidence at all on any detonation.

RJ