water/methanol injection vs intercooler
#11
03-07-2012, 08:28 PM
You cant go wrong with water injection. Its Cheap insurance for towing and works well for sure. Mine only comes on when first getting up to speed, and pulling hills when towing my 28' travel trailer. I usually only run about 10% alky and 90% water (distilled water). I figure the alky will stop any green sh*t from growing in the holding tank. Good luck with your project and let us know how it goes.
#12
03-10-2012, 10:31 AM
They don't like drugs.
You will get more power, but the design is weak so it leads to early failure. Should be kept to around 5-10% at the most.
Straight water is usually the best bet with a 6.5, mainly for egt control.
While I'm not going to argue that distilled water is best ('cause it is!), i just fill my tank form whatever source is available.
I hauled my trailer from Vancouver Island to Newfoundland (the island part) last year and filled it from everything from store bought "jugged" water to camp well sites.
No build up, no problems.
YMMV....
Last edited by great white; 03-10-2012 at 10:45 AM.
#13
03-10-2012, 11:16 AM
They do fine with low methanol amounts. You can't run 50/50 like on DI engines, but the 33% in the -20 stuff is fine. I run a 4gph nozzle with -20 washer fluid in my 3.0L IDI engines with no problems. It used to be 5.5gph but I downsized because of slight detonation at high RPM on hot days.
Sorry, your 3.0 Merc is not a 6.5 GM.
Just because they're both IDI does not make them the same.
The Merc has much more power potential and it is a more robust design in many ways.
GM really missed the boat with the 6.X series for anything other than MPG.
The 6.5 Gm does not do well with more than 5-10% meth/alcohol....tops.
#14
03-10-2012, 01:02 PM
You're right. The 6.5's prechamber design is the same as VW's, which handle 33% WM injection just as well as my Mercedes. In fact, my mercedes should be able to handle LESS than your GM since our design has a hot-ball in the prechamber that will detonate excessive methanol (while your GM prechamber is nothing more than a chamber).
Actually it makes them very similar. My engine has far more in relation to yours than a duramax.
Not true. That is primarily due to the fact I can safely revv a stock engine to 5500rpm to make horsepower, while a 6.5 has to make a lot more torque (higher combustion pressure) to produce the same horsepower number due to its lower maximum speed.
5-10% at what injection quantity?
Injection quantity plays a HUGE role in the fuel mix you can run. If you're injecting 6+gph, yeah, 5-10% is all it could handle. But if you use 3gph with cooling the charge air being the primary goal, 33% will work well.
Actually it makes them very similar. My engine has far more in relation to yours than a duramax.
Not true. That is primarily due to the fact I can safely revv a stock engine to 5500rpm to make horsepower, while a 6.5 has to make a lot more torque (higher combustion pressure) to produce the same horsepower number due to its lower maximum speed.
5-10% at what injection quantity?
Injection quantity plays a HUGE role in the fuel mix you can run. If you're injecting 6+gph, yeah, 5-10% is all it could handle. But if you use 3gph with cooling the charge air being the primary goal, 33% will work well.
You know, I started typing up a detailed response refuting what needed refuting. But halfway through I simply deleted it.
I lost my taste for this sort of thing on the internet a long time ago and have no desire to get involved in it now either.
I'll simply say I stand by my original statements, the readers can make up their own minds and that I'm done with this thread.
Last edited by great white; 03-10-2012 at 01:44 PM.
#15
03-11-2012, 08:14 AM
#16
03-18-2012, 09:56 PM
#19
05-06-2012, 11:30 PM
#20
05-07-2012, 06:43 PM
Diesel Bomber
I concur with Whargoul. For instance, I just got back from a weekend trip up in the forested mountains in beautiful southern new mexico. I have a 10 gallon water /alky tank, and Im using two 150cc nozzles on my set up, 300cc's total. I drove up hill between 6 and 8% of incline. I drove 31 miles uphill and used 2 gallons of wtr/alky. I was going roughly 45 mph, and towing a 28' traveltrailer weighing approx. 8800 lbs. My EGT's were right at 1000 degrees the whole way. Im not sure how long it took me in minutes tho. Some of the curves were switchbacks and had to slow to about 25 mph. Hope this helps.
