A lean condition - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old Jan 18th, 08, 06:19 PM Thread Starter
Senior Tech
 
Join Date: Nov 2006
Location: Bend, OR
Posts: 1,702
A lean condition

Why is it that when a motor is running lean (usually just before it blows up) it seems to be producing the most HP???

I had a snowmobile that was not jetted right and it was screaming just before the pistons melted. It's seems that a richer mix would produce more power, but I know that is not the case at all. Although being very bad on a motor, why do they produce more power in that condition????


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dubs68camaro is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old Jan 18th, 08, 06:57 PM
Gold Lifetime Member
Jim
 
Join Date: Dec 1999
Location: Yorkville, Illinois USA
Posts: 22,121
Re: A lean condition

lean is good. lean makes power. Excess fuel (more fuel than there is oxygen to burn) cools... those pistons in the sled could have used some of that. Top fuelers spit 10' flames because too much fuel is the only cooling system they have.

Carbs are rotten, and because of that they are always jetted rich. That way the lean spots aren't so lean they melt pistons/.
EFI is better. That's why a modern V8 can put out 400 Hp and still get nearly 30mpg. They run lean. "Almost" to the point of pain lean. But not quite.

Ever run a lawnmower out of gas? Just before she quites, the rpm's go to the moon.





To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
New website for my vert is coming together. Do ya like the slide show on the home page?
JimM is offline  
post #3 of 3 (permalink) Old Jan 18th, 08, 07:11 PM Thread Starter
Senior Tech
 
Join Date: Nov 2006
Location: Bend, OR
Posts: 1,702
Re: A lean condition

Quote:
Originally Posted by JimM View Post
lean is good. lean makes power. Excess fuel (more fuel than there is oxygen to burn) cools... those pistons in the sled could have used some of that. Top fuelers spit 10' flames because too much fuel is the only cooling system they have.

Carbs are rotten, and because of that they are always jetted rich. That way the lean spots aren't so lean they melt pistons/.
EFI is better. That's why a modern V8 can put out 400 Hp and still get nearly 30mpg. They run lean. "Almost" to the point of pain lean. But not quite.

Ever run a lawnmower out of gas? Just before she quites, the rpm's go to the moon.

that was a good explaination Jim. I'm addicted to horsepower TV on the weekends. Granted, they do not have a budget, but I was watching a show where they were doing the famous dyno run with an FI car. They produced a fairly good pull but said it was running a little fat. With a couple of click of the notebook computer, they got like another 70hp.....I about crapped. I have my 460 bbc running perfect on the front tubes, but I never changed the rears because I didn't want to pull the carb at that time to change the rears. I'm rear curious just how much better is will run on all 4's this spring when I pull those rear jets down just a bit. I'm at 3,200 in elevation and they usually come out of the box for sea level. I'm not expecting 70hp, but I think it will pull a little better.

I liked the top fuel info. That makes sense and I always wondered why they spit so much raw fuel. Best to watch at night huh????? Doesn't the alcohol blend counter the added heat of the nitro?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dubs68camaro is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome