waterinjection.info  

Go Back   waterinjection.info > Injection Theory (what it is and what it does) > In Cylinder Effects

Reply
 
Thread Tools Display Modes
  #1  
Old 20-07-2007, 04:09 PM
cantona156 cantona156 is offline
Junior Member
 
Join Date: Jul 2007
Posts: 7
Default Will WI cause corrosion and pitting?

Will WI cause corrosion and pitting on Cylinder wall n injectors?

Some material I found seem to indicate so ....
Any comments?

Thanks.
http://en.wikipedia.org/wiki/Water_injection_(engines)
Reply With Quote
  #2  
Old 27-07-2007, 04:47 PM
JohnA JohnA is offline
Senior Member
 
Join Date: Nov 2003
Posts: 352
Default Re: Will WI cause corrosion and pitting?

Quote:
Originally Posted by cantona156
Will WI cause corrosion and pitting on Cylinder wall n injectors?
Not really :lol:
Water after all is a natural byproduct of combustion :wink:

And it's not like the whole engine is submerged in water all the time. For a tiny percentage of operating time a water mist is added to the airflow.
I've never heard of pitting on cylinder walls, that's a new one --- oh well...
__________________
Cheers,

John

www.max-boost.co.uk
Reply With Quote
  #3  
Old 28-07-2007, 10:56 AM
cantona156 cantona156 is offline
Junior Member
 
Join Date: Jul 2007
Posts: 7
Default

Oh heck, I am installing one soon anyhow. Likely Aquamist 2D.

Driving a Legacy with 2.5 STi block, running 1.5-1.7bar boost. My TMIC was totally overwhelmed.
Just installed a small FMIC. So the WI will come after my FMIC is settled (still leaking some air).

Anyway, based on my injector (650cc/min @80% duty cycle) & 10% water to fuel ratio, I am looking at 0.5-0.6mm nozzle.
I will be also be installing an Charge Air temp gauge, to see the effects with and without the WI (with 50% methanol).

The other thing is tuning. I was told we need to tune for leaner AFR 12.5:1 with WI ...to really see its effect.
Not very optimistic about this. But will try to convince my tuner to give it a shot.
Reply With Quote
  #4  
Old 28-07-2007, 11:48 AM
JohnA JohnA is offline
Senior Member
 
Join Date: Nov 2003
Posts: 352
Default

Quote:
Originally Posted by cantona156
....Anyway, based on my injector (650cc/min @80% duty cycle) & 10% water to fuel ratio, I am looking at 0.5-0.6mm nozzle.
I will be also be installing an Charge Air temp gauge, to see the effects with and without the WI (with 50% methanol).
Keep us posted.
Don't expect a dramatic drop in charge air temps though, especially if the nozzle is placed *after* the intercooler. Heat exchange needs temp difference in order to be efficient.
Also mind the distance between the nozzle and the air temp sensor. If they are only a few inches apart there won't be much time for the mist to cool the charge down *and* register it on the sensor as well.

Most of the W.I. benefits come from in-cylinder cooling, remember, so a KNOCK sensor would show the difference of W.I. :wink:
Quote:
The other thing is tuning. I was told we need to tune for leaner AFR 12.5:1 with WI ...to really see its effect.
Not very optimistic about this. But will try to convince my tuner to give it a shot.
If you're running 10 or 11:1 AFRs there is much less room for W.I. power gains. You can still push boost higher though.
__________________
Cheers,

John

www.max-boost.co.uk
Reply With Quote
  #5  
Old 28-07-2007, 01:10 PM
cantona156 cantona156 is offline
Junior Member
 
Join Date: Jul 2007
Posts: 7
Default

When I was on my TMIC, my charged air temp after IC was over 90degC after 2 runs.
Tuner had no choice but to richen the mixture. Currently doing 10.5-10.8, no thanks to the old TMIC.
The outside air temp was 32-33degC.

Hopefully with FMIC (quite a small one), I can see 50-60degC consistently ...
And let the 50:50 WI do the rest .... 40degC or so.

At 1.7bar, I am already running the limit of my autobox (52kgm). Can't run any more boost, unfortunately. :lol:
Hopefully, with WI like 2D (with real-time feedback), the tuner can run leaner a little, and run slightly more aggressive timing.
Of course, WI can provide some margin against poorer fuel in the future.

The other thing is, in event that I run out of water, clog injectors, pump failures etc, i can run lower boost, or even cut boost via my boost controller... as long as I am aware of the problem (via 2D hopefully).
Reply With Quote
  #6  
Old 13-09-2007, 02:34 AM
RICE RACING RICE RACING is offline
Senior Member
 
Join Date: Oct 2003
Location: Utopia
Posts: 511
Default Re: Will WI cause corrosion and pitting?

Quote:
Originally Posted by cantona156
Will WI cause corrosion and pitting on Cylinder wall n injectors?

Some material I found seem to indicate so ....
Any comments?

Thanks.
http://en.wikipedia.org/wiki/Water_injection_(engines)
100% BULLSHIT

Had a look inside a motor that runs my WI and we have probably pumped though well over 100lt in testing and the engine is mint and so too is the compressor wheel

I love alot of these old wives tales circulated on the internet lol :lol:
Reply With Quote
  #7  
Old 13-09-2007, 09:15 AM
JohnA JohnA is offline
Senior Member
 
Join Date: Nov 2003
Posts: 352
Default Re: Will WI cause corrosion and pitting?

Quote:
Originally Posted by RICE RACING
...I love alot of these old wives tales circulated on the internet lol :lol:
Old wives' tales :lol:
If they were true, we'd all be blind from the age of 12 :wink:
__________________
Cheers,

John

www.max-boost.co.uk
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 08:18 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.