ATTN: TEX - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 04-27-2000, 08:00 AM Thread Starter
Keyboard Implanted
 
elusive's Avatar
 
Join Date: Nov 1999
Location: temecula, CA
Posts: 4,893
Thanks: 0
Thanked 1 Time in 1 Post
 
ATTN: TEX

hey tex.... i am planning on racing in one of my first mud races this weekend, but i am concerned that i won't be able to run in a street class.. i think i am ok except i am unsure if i am going to pull enough vacume..where does it usually get measured? there is a new track here i like.. an actual mud bog with deep holes where my lockers might be usefull and i don't think anyone will run with me in street class..

~~Elusive~~
it's sort of still a cj thingy....
elusive is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 04-27-2000, 09:53 AM
TEX
Guest
 
Posts: n/a
Re: ATTN: TEX

<font color=purple>They generally check it off the manifold or carb - wherever a line is handy. Most places will require 15" at 800 RPM's if they're checking vacuum, & you have to have a relatively hot cam to not pull that. Most places that do deep pits don't bother with the vacuum since tires play a more important part than engine the deeper it gets. But, some places do check it & I check it in my very lowest "Pit" street class at my G.U.M.B.O. events.</font color=purple>

TEX

[img]/wwwthreads_images/icons/wink.gif[/img] Got Mud?
G.U.M.B.O. Mud Racing

post #3 of (permalink) Old 04-27-2000, 10:01 AM Thread Starter
Keyboard Implanted
 
elusive's Avatar
 
Join Date: Nov 1999
Location: temecula, CA
Posts: 4,893
Thanks: 0
Thanked 1 Time in 1 Post
 
Re: ATTN: TEX

thanks.. i think i have a 292 lift with 508/510 duration.. is there a trick to getting it to pull a bit more?? maybe with timing..just for the check?
i am running in the street class with my prodject tj-7...it's a jeep frame and original engine.. i think i'm ok...
thanks

~~Elusive~~
it's sort of still a cj thingy....
elusive is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 04-27-2000, 04:17 PM
TEX
Guest
 
Posts: n/a
Re: ATTN: TEX

<font color=purple>Yeah, you're going to be really borderline at best. Timing can help, and I've heard that having the engine fully warmed up is the way to go, but some of these vacuum guys can either verify that or not. I've even heard of guys with roller rockers loosening up the valvetrain for tech & fixing it afterwards. 'Course if you have to pass a post-race tech, you're gonna be SOL with that method. Oddly enough, in my 13 years of mud racing - all in street stock & super stock, I've never had a vacuum test. The only events that I've attended that had a vacuum check had me bumped up out of the vacuum class due to some other mod - like an engine swap.</font color=purple>

TEX

[img]/wwwthreads_images/icons/wink.gif[/img] Got Mud?
G.U.M.B.O. Mud Racing

Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 for yourself.

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 not post new threads
You may not 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