Honda Prelude Forum : Honda Prelude Forums

e85 Demystified: Why you should be burning e85 in your FI and NA Preludes!

playludesc — Sat, 11 Feb 2012 00:21:54 GMT

e85 is an amazing fuel. Let's break down why:

It has more oxygen in it than gasoline, much more. This allows you to get more oxygen in the combustion chamber than you normally would. Even though this oxygen is bonded to the rest of the ethanol molecule before combustion, it's still burned in the cylinder, just like nitrous. The stoichiometric ratio of e85 is approximately 9.6:1 and gasoline's is approximately 14.7:1, so not only do you have more fuel to burn, but more oxygen, too! This is why most cars will make 15-20% more power on e85 than with even the highest octane race gasoline. (Chemically, the most power you could make would be 27% more than gasoline, but that's hard to reach due to other restrictions).

It reduces intake air temperatures four times more than gasoline when injected into the air fuel mixture at proper air-to-fuel ratios. This is because alcohol requires more energy to evaporate than gasoline does and you're also injecting about 35% more of it into the air fuel mixture than you are with gasoline. To prove this to yourself, imagine (or actually do it, safely!) dipping your fingers in gasoline and placing them in front of a fan. Your fingers would get pretty cold. Then imagine dipping your entire hand in alcohol and placing it in front of the same fan, it would get much, much colder.

e85 has an American octane rating of approximately 105, but the American test for octane rating (MON) uses a preheated air-fuel mixture at 300 degrees! This means that they inject e85 into the air and then heat that mixture to 300*F. This is why the commonly known octane rating of 105 is innacurate for e85. Preheating the air-fuel mixture doesn't accurately model intake temperatures that are so significantly lowered by e85 in real world applications. Because of the heat-lowering effectiveness of e85, it's more accurate octane rating is between 112 and 118. Because of this you can run higher compression, more boost, or both!

It burns faster than gasoline. At a 1:1 air fuel ratio, gasoline burns at 26cm/sec and ethanol burns at 41cm/sec. As you lean the air-to-fuel ratio, Ethanol continues to burn faster than gasoline. This is a major advantage over gasoline because it allows you to use more retarded ignition timing while still extracting maximum power out of the fuel. Retarded ignition timing is good because it allows you start the powerstroke later and harness the mechanical advantage the rod has on the crank as it's tilted rather than directly above crank. This also significantly reduces the shock the piston, rod and crank experience when the explosion happens before or during top dead center.

In our cars it lowers oil and water temperature about 15*F and exhaust gas temperatures by 200*F! A colder engine is a longer lasting one!

Because of government subsidies, it's cheaper! Also, depending on which propaganda you believe, it's probably not as bad for the environment as you thought and it lessens dependancy on foreign oil!

Sources:
http://e85forum.net/forum/viewtopic.php?f=5&t=7&sid=6841bd34822db6e2e80eaaa4 863228f0

http://www.eng-tips.com/viewthread.cfm?qid=188508

http://www.osbornauto.com/octane.htm

http://en.wikipedia.org/wiki/Ethanol

http://en.wikipedia.org/wiki/Gasoline

http://en.wikipedia.org/wiki/Nitrous

http://honda-tech.com/showthread.php?t=1701028

Shifter will not come out of Park, after H22 swap...

nemesis25 — Fri, 10 Feb 2012 20:41:23 GMT

Well, here is my very first post on this forum. Recently, I completed an H22 swap on my 92 Prelude, with an A/T. I must say the swap went very good. The only problem I'm having is the shifter wont come out of Park. I'm currently using a P13 Auto ECU with a P0N TCU. So, I called Steve from Hmotorsonline, to research this issue further. He told me that I have to move three TCU pins around but he didn't know which ones, off the top of his head. He did mention that there's a write-up on this forum. So, here I am! I searched and searched but to no avail. If someone can steer me in the direction of that write up, that would be great.
Thanks Preludepower!

Boosting Prelude

mafiadogg — Fri, 10 Feb 2012 20:27:12 GMT

Hi, I am looking for a cheap way to boost a 5th gen prelude without sacrificing reliability. Specifically, i am looking for something that will cost under 1.5 grand.. Supercharger and turbocharger both are fine as to what i am looking for. i just want something that is lower in price, reliable, and adds performance to the engine.. i will be doing all of the work myself as i have experience working with cars. however, this is my first time boosting..

hey guys

chughart2010 — Fri, 10 Feb 2012 20:16:25 GMT

hey guys i was behind a 3rd gen the other day and was looking at the rear of the car and was wandering, will the 3rd gen si wing fit on a 2nd gen? and what r ur opinions on how it wuld look?

thanks,
chris

New Wheels on the Lude !

3genluder — Fri, 10 Feb 2012 19:47:52 GMT

I finally got new wheels and i have had them for probably 2 weeks but i am just now able to share with you guys . I bought 15x7,949 6UL's and wrapped them in 205/50-15 Nitto NeoGens . Tell me what you all think .

F/S 4th Gen: JDM heated seat switch!

n0rmaL — Fri, 10 Feb 2012 19:40:13 GMT

$40 shipped obo

F/S 4th Gen: 94-96 turn signals

n0rmaL — Fri, 10 Feb 2012 19:38:15 GMT

$30 shipped

F/S 4th Gen: JDM 1 piece black housing headlights

n0rmaL — Fri, 10 Feb 2012 19:36:26 GMT

$150 shipped

F/S 4th Gen: yellow jdm foglights

n0rmaL — Fri, 10 Feb 2012 19:33:35 GMT

$200 shipped

F/S 3rd Gen: Sad day :( 88 S w/ Si swap pretty much only good for parts

SquishyPanda — Fri, 10 Feb 2012 19:28:15 GMT

So a lot of stuff happened. I decided to finish college and then got a job that involves pretty much constant travel, so I haven't been able to keep 'er maintained. Also failed the new evaporative emissions test in CA, probably because of the hodge-podge job I did of getting the Si fuel system to play nice with the S tank. Also won't start. Can't figure out why. I can hear the fuel pump cycle and everything. Also took a good door ding from some moron that didn't set her parking brake, and the front end is kinda toast because I fell asleep at the wheel half a mile from my house >_<

What it has on it: Tokico blues, probably worn out. Front is Neuspeed Race springs (2.25" drop) and rear is RS*R (1.5" drop). I also have the rear Neuspeeds and front RS*R's. IMO the RS*R's are far better.

There's also an Apex'i World Sport muffler (not sure if it's a I or II), custom tall-reach short-throw shifter, dirty-ass Momo steering wheel on generic 6-bolt adapter.

No rear seats.

The car is on the 5th floor of the parking structure of UCSD Grad housing in La Jolla and I've lost the key. If you want the parts, and are confident you can get the car out of there, I can meet you there with the springs and help you, and you can just have the damn thing.

I leave for another work trip on Feb. 14 and won't be back for about a month (don't know an exact date yet) so either before the 14th or sometime mid-March is good. I'd hate to scrap the car if there's still 3rd genners in the area that want to keep their cars on the road. I just don't have the time anymore since I'm never home :(

PM or email me at joel at squishypanda dot com

edit: The car is on 14" BMW bottlecaps right now. I still have the Black 15" VW BBS's (two of them are out-of-true) and white 15" Riken meshes.

I think I still have a set of 15" wide BMW meshes that need longer studs to fit a Honda hub, too. Maybe a stock shifter laying around somewhere.

So if you want any rims (with or without the car) let me know. Maybe $50/set without the car, $20 with? I'm more concerned with simplifying my life than making money off this stuff right now lol

H22 IM on H23

scott8989 — Fri, 10 Feb 2012 18:16:29 GMT

ok so i looked around for some info on this and came up dry. anyone know if the h22 intake mani bolts onto the h23a1 head?

F/S 3rd Gen: 1988 Prelude White 4WS

hondalude89 — Fri, 10 Feb 2012 15:56:17 GMT

Selling 1988 Prelude. it is white and has 151,xxx miles. Automatic transmission with 4WS. Car is bone stock and all electrical works.

took car to shop and was told it has a dropped valve. So obviously it is not running. Bring your trailer or tow truck. Car is in Dallas area, or Frisco to be exact.

Asking for $600 or best offer. Shoot an offer, worst answer is no.

Hit me up via email: Srusse88@gmail.com

Here is the link to the pictures:
http://s301.photobucket.com/albums/n...view=slideshow

Motivated seller.

By the way, it is not my 3G. Sold that a while back.

Small wet spot right inside wheel on passenger side of my prelude any 1 kno wat it is

lensremix.com — Fri, 10 Feb 2012 15:17:19 GMT

I was leaving this morning and noticed a small but noticeable wet spot on the ground right inside the tire on the passengers side of my prelude. I didn't have time to check it out to try and see where it was coming from. But what fluids could leak on that side of the car??

Prelude 5th Gen,Turns of while driving, and tachometer bounces before it shut down.

Espinozakid — Fri, 10 Feb 2012 14:17:41 GMT

I did a full Tune up on my 2000 Honda Prelude and since then my car will randomly shut of while I'm driving. Normally i will turn back on however sometimes after i let it sit when I'm done driving i will get in it and it will not turn over. Also when i am driving it the tachometer will bounce and usually it does that when it wants to shut down. What could it possibly be?

3rd gen exhaust question.

cjprelude — Fri, 10 Feb 2012 09:26:51 GMT

hey guys so i would really like to upgrade my lude, put a nice air intake and exhaust header.

anyway, all the B21 headers i see for sale have 3 stud holes for bolting onto the downpipe. my downpipe has 4 holes for the original mani studs.

is there an aftermarket downpipe for our cars? what am i missing here?

thanks,

Cory