crf538

iTrader: (3)

anyone know of any drawbacks to spraying A LOT of meth, i have an alkycontrol kit (great kit btw) and was considering ordering a second nozzle. it seems like this would be well worth the effort if i could run even one more degree of timing. in the grand scheme i really dont think the extra meth consumption is anything to worry about. Right now im running a stock short block and i wanna make sure when it does fail its not for something gay like a ring land. Also that should allow me to really turn it up when i get a decent motor.

shawn_c992001

What do your A/F ratios look like?

crf538

iTrader: (3)

bout 10.8:1 right now, im leaning it to 11:1 slowly, id rather be a little fat and safe

engineermike

I heard about some DSM guys running massive amount of Meth and 40+ psi boost. We're talking about 50% replacement of gasoline or so.

Mr.Big

the only down side is your rear tire bill...

BigRich954RR

iTrader: (1)

yup

alkycontrol kit here 2 nozzles 11.1 compression with 15 psi of boost stock pistons

EPP

iTrader: (22)

I was wondering if an excessive amount of methanol could wash the oil off the cylinder walls and cause excessive ring wear. It would be interesting to see if anyone has done any long term testing on this. Bob

EdwardETraylorIII

No problem with a bunch of meth...

Just remember - the stoichiometric A/F ratio of meth is considerably lower than that of gasoline!

Mr.Big

that's the beauty behind the additives meant to deter this very issue in V.P. Fuels M3

crf538

iTrader: (3)

whoa...thats what i wanted to hear, i'll get the other nozzle coming...thanks guys

engineermike

The circle track and drag motors that run straight methanol seem to do Ok. At least we have the advantage of building an oil film back up on the wall between full throttle runs.

crashly

ok,
my fuel system is a bit different to yours....
i run 100 % alchy, mechanical injection...
drag only
running a bit richer , decreases the chances of dentination,
with a deg or 2 extra of timing , the engine tune up is safer.
the extra meth makes more torque , but the engine will not make the same hp up higher in the rpm ( only about 7-9 % difference)

if your ignition is not up to the task , then the meth can get past the rings and "milk" up the engine oil.
by checking engine dip stick , you can manage it, along with a/f meter

when i first put my turbo meth into car and was testing, we were running way rich, ( like nearly 1 gal/ min toooo much fuel)
no harm was found on bore of cylinders.... only milking the oil...
we now use just on 5 gals / minute of meth fuel for a pass... ( 10 liters...)

trust me, better to be slightly on the rich side of the tune up...
it cost less in the long run..


ash

DeltaT

iTrader: (5)

I have heard of problems with too much water or meth and a tight quench area, leading to hydraulic lock of the piston to the head, but no one's been able to tell me how much meth was involved. Do you know if you have a quench area and its clearance if you do?

In addition to Bob's comments above about ring wear, I would also start to worry about needing to change the oil after every couple runs due to contamination - it turns milky and nasty (edit - as crashly notes above - he beat me to it!).

Jim

crashly

going to have to be ALOT of water and meth to creat a hydraulic lock....

the compression temp alone with evaporate the meth / water mix, with out boost involved...

how hot does the oil get ?
the meth should evaporate out under full load, and general driving,
the breather will show ' steam' getting blown out..

crashly

quench is OVER rated in blown engines....

Slowhawk

iTrader: (12)

Customer has been running a dual nozzle setup at 80% for 3 years now,(14-15 psi on 427ci)probly 20-30k miles and a ton of track passes.No problems yet.

Grr

iTrader: (2)

Ha, thats why you run 100% straight methanol!! NO WATER, it doesnt work as good!
I used to run my buick GN up to 32psi, 24-26deg timing on 89 octane fuel. Dual M10 nozzles on a alkycontrol kit ramping up to as much as they would flow over 28psi, not 1 single problem at all. Figured it was around 35-45% of my fuel, running around 10.3:1 AFR on my guage. 36# bluetops maxxed out at around 22psi and at 32psi would read 100%DC at 4000 rpm, shift at 5600
That motor saw 32psi multiple times every day and ran this way for about 22k miles on stock everything. I added up all the methanol i used that i could remember and it was in the range of 160-180 gallons, i would fill a 5 gal can every friday at the track. When the motor was tore down (135k mile original longblock) still had the factory crosshatch perfectly visible and was rebuilt with a light hone and STD pistons
Gary

jfg455

iTrader: (5)

Basic rule of thumb is 18-20% meth replacement for fuel. After that you realy should be going to 100% meth cause you have maxed out your benifits of adding it to gas. This was direct from Jolio at Alkycontrol.

Grr

iTrader: (2)

thats why you keep cutting back the gas and adding more meth. If you arent spraying at the limits of the alky system, you still have room for improvement. add meth, remove fuel. Keep this up till you just cant go any farther.
I will agree getting it over 20% is a chore, and you really have to know what your doing, but once you get a system figured out, just keep going. I had alot of trouble up around 20% but once i got into the 30% range it went very smooth.

jfg455

iTrader: (5)

You really have to watch your knock closely when you are pushing that hard. You can "tickle it" a little (4-5 counts max) just keep an eye on it. Just 15* of air temp drop and all of a sudden you are leaning out at the top end as well! Fun stuff.