100% Methanol or 50/50 Mix?
09-09-2007, 03:22 PM
#41
9 Second Club
It seems that most of the racers use straight meth, but a lot of people who have done dyno testing say 50/50 is best.
Although Vince probably has a good point. Will intake temps before meth, mean one mix might lend itself better than the other ?
Didnt the old WWII planes use 50/50....Im sure they did a LOT of testing to see which was best, even if it was years ago.
Some seem to think the water turning to steam inside the combustion chamber during combustion, offers good benefits
Although Vince probably has a good point. Will intake temps before meth, mean one mix might lend itself better than the other ?
Didnt the old WWII planes use 50/50....Im sure they did a LOT of testing to see which was best, even if it was years ago.
Some seem to think the water turning to steam inside the combustion chamber during combustion, offers good benefits
09-10-2007, 06:26 AM
#42
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Buick guys have been using alky for over 10 years now. We have shot water, rubbing alky, denatured, race gas, toluene, propane (yes propane) and god knows what else into them in different mixes. In the end we always go back straight Meth to get the best results. I understand the physics and the other arguments but in the end 100% Meth gets it done better on a consistent basis.
Mike
Mike
09-10-2007, 10:47 AM
#43
Originally Posted by Full Throttle
Buick guys have been using alky for over 10 years now. We have shot water, rubbing alky, denatured, race gas, toluene, propane (yes propane) and god knows what else into them in different mixes.
09-10-2007, 02:22 PM
#47
Are meth kits only good at dropping iat temps when you reach boost levels, but not during normal cruising? Do intercoolers drop iat temps during the whole course of driving?
09-10-2007, 04:28 PM
#48
9 Second Club
Originally Posted by Evaporate
Are meth kits only good at dropping iat temps when you reach boost levels, but not during normal cruising?
Do intercoolers drop iat temps during the whole course of driving?
09-10-2007, 11:05 PM
#50
Not to stray off topic but how do you like that FJO pump? I noticed its the same design as my oil pump with the heat sink built on. Does it have that overheating wire built in that many claim needs to be absent from a good meth pump? They seem to have a very solid product line. (what kind of hose do they use also?)
Hose is some sort of plastic or teflon that I will probably replace with braided teflon line for durability.
I want to install it before I start adding back timing into this new T-trim tune. No knock on pump gas but timing at ~10.8# is pulled back to 19 degrees with an 11.3:1 AFR. Looking forward to any IAT drop as well.
Jim
09-11-2007, 01:09 AM
#52
Originally Posted by engineermike
Who cares about IAT during normal driving?
09-11-2007, 06:01 AM
#53
Originally Posted by Evaporate
Tell me why I shouldn't? Trying to learn this stuff, I just figured that it would be more beneficial on the motor in the long run
What, exactly, in the engine do to think can't take 200 deg IAT's? The coolant regularly runs 220 deg, EGT's run 1200 - 1800 def F, and combustion temps are much higher than both.
Mike
09-11-2007, 12:27 PM
#54
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engineermike, not to hijack the thread here, but would you say that I don't have to worry if my wideband is showing lean (15-17) AFRs when I'm gently cruising (little or no throttle) around in 5th and 6th gear at about 2000 rpm? Because cylinder pressure is presumably low? As soon as I give some throttle (maybe 15%) my AFRs come down to about 14.5. Just curious; I've always wondered if "lean on the wideband" matters or not when the engine is not working hard.
09-11-2007, 12:29 PM
#55
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I prefer to have my cake and eat it too. 
Lower cruise iat's mean that engine will be less prone to knock as well. When you get on it, even meth doesn't come on instantly and I have seen cases of high iat's at cruise causing detonation (when going to wot) until things cool down.
This can be especially not so good with pd blowers...maggies and twin screws....can't speak for others.
remember , that nothing happens instantaneously, it all takes time
jmo
Lower cruise iat's mean that engine will be less prone to knock as well. When you get on it, even meth doesn't come on instantly and I have seen cases of high iat's at cruise causing detonation (when going to wot) until things cool down.
This can be especially not so good with pd blowers...maggies and twin screws....can't speak for others.
remember , that nothing happens instantaneously, it all takes time
jmo
09-11-2007, 01:55 PM
#57
9 Second Club
OEM's run 14.7:1, as this is the cleanest burn, with the least polluting emissions.
Running leaner than this increase NOx emissions considerably, which the tree huggers hate, so manufacturers have to be nice to them, or they will all start killing us with tree branches and mud
Running leaner than this increase NOx emissions considerably, which the tree huggers hate, so manufacturers have to be nice to them, or they will all start killing us with tree branches and mud
09-11-2007, 02:14 PM
#58
Originally Posted by RW99
engineermike, not to hijack the thread here, but would you say that I don't have to worry if my wideband is showing lean (15-17) AFRs when I'm gently cruising (little or no throttle) around in 5th and 6th gear at about 2000 rpm? Because cylinder pressure is presumably low? As soon as I give some throttle (maybe 15%) my AFRs come down to about 14.5. Just curious; I've always wondered if "lean on the wideband" matters or not when the engine is not working hard.
as long as you don't have any bucking in that cruise area I'd say you're ok.
09-11-2007, 05:34 PM
#59
Originally Posted by Full Throttle
16 to 1 is a pretty typical highway cruise these days for the OEM's as long as it puts some fuel in when you add some load I would be happy with that
Mike
Mike
Mike
Thanks very much, guys... 