Another 401 build and discussion thread.... - Page 3 - JeepForum.com

Reply
 
LinkBack Thread Tools
post #31 of 184 Old 01-07-2014, 08:54 AM
benullman
Registered User
1981 CJ7 
 
Join Date: May 2010
Location: mechanicsville, VA
Posts: 2,139
UBERK,

Do you still have the factory choke heater tubes? If so I will buy them off you if you would like to sell them.

Doing a completely stock rebuild and need them!

Ben


Quote:
Originally Posted by Gregg79CJ7304 View Post
Great minds think alike, but so do serial killers......Thanks.
benullman is offline  
Sponsored Links
Advertisement
 
post #32 of 184 Old 01-07-2014, 09:06 AM
iluvcowjuice
Registered User
1979 CJ7 
 
Join Date: May 2010
Location: Olney, MD
Posts: 517
Quote:
Originally Posted by UBERK View Post
Wanting to swap to 82-86' front shock mounts as well.....if I can find any. A local 4X4 makes a nice aftermarket set which I might opt for, then slap on some 5100's.
Ford shock towers are a cheap upgrade in strength with more travel.
http://www.in2jeep.com/fordshockmt.htm
iluvcowjuice is offline  
post #33 of 184 Old 01-07-2014, 03:34 PM Thread Starter
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480
Posts: 589
Quote:
Originally Posted by benullman View Post
UBERK,
Do you still have the factory choke heater tubes? If so I will buy them off you if you would like to sell them.
Sorry, just sold the OE intake today and sent them with it.

Quote:
Originally Posted by iluvcowjuice View Post
Ford shock towers are a cheap upgrade in strength with more travel.
I did the F250 towers on my K5, they work well and are inexpensive...$35 locally for the set from a dealer. Heres the link to the instsall on my K5: http://www.gmsquarebody.com/forum/showthread.php?t=4639

....takes a bit more work than whats needed on a CJ, but I loved the extra travel. I also added 64" rear leafs at the same time, that ride was really plush for a full size straight axle SUV

A local shop makes these:



...which Ill probably end up going with....at some point.
UBERK is offline  
post #34 of 184 Old 01-10-2014, 01:04 PM Thread Starter
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480
Posts: 589
Since the CJ is down for a motor rebuild there are a few other small projects I'm going to do, like replacing some 38 year old mounts....

Got the body kit and trans mount in today:



Old v New...



I'll be grabbing all new G8 hardware this weekend to install it.

I had a brain fart when ordering the motor mounts though and got a set for a 258. After looking up the correct PN they are $110 on Summit....however I can get a set of very slightly used MORE Bomb Proof mounts for $125 from a local Jeeper.....

I'm thinking I'll do the poly though as this thing will be primarily a street rig and only see mild trails.
UBERK is offline  
post #35 of 184 Old 01-12-2014, 07:14 PM Thread Starter
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480
Posts: 589
Found my problem....





















I'm wondering if there was a clearance issue with the pistons and heads....? I don't see any damage on the heads or indication the valves are ruined. Lifters, pushrods and rockers all look good.

Lost some bearings, found shavings in the bottom of the pan.
UBERK is offline  
post #36 of 184 Old 01-12-2014, 07:17 PM Thread Starter
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480
Posts: 589
Crank and cylinder walls actually look good...considering:





I think I'll be able to get by with just a hone and polishing on them......
UBERK is offline  
post #37 of 184 Old 01-12-2014, 08:08 PM
swatson454
Registered User
1983 CJ7 
 
Join Date: May 2009
Location: Texas Hill Country
Posts: 6,514
Ouch! I'm guessing it got hot at some point and butted the ring gaps. Never a good deal!



Looking at the discoloration around the wrist pins, I'd lay money on it getting got. That being the case, I'd go for the full monte regarding machine work.


Shawn

Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is offline  
post #38 of 184 Old 01-12-2014, 08:33 PM
CSP
Registered User
 
Join Date: Aug 2002
Location: Colorado
Posts: 15,876
Fullsize Jeeps are a possible source of the widetrack CJ shock towers. They used the same towers.
CSP is offline  
post #39 of 184 Old 01-14-2014, 02:29 PM Thread Starter
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480
Posts: 589
Quote:
Originally Posted by swatson454 View Post
Looking at the discoloration around the wrist pins, I'd lay money on it getting got. That being the case, I'd go for the full monte regarding machine work.
Just left the machine shop this afternoon.... They come highly recommended by a trusted source and have experience with AMC's.

I hope to get it to them by the end of next week, 2 weeks tops.....for the Full Monty including rebuilding the heads.

I think Im gonna switch up to the Lunati Voodoo cam:

Basic Operating RPM Range: 1,600-5,800
Intake Duration at 050 inch Lift: 220
Exhaust Duration at 050 inch Lift: 226
Duration at 050 inch Lift: 220 int./226 exh.
Advertised Intake Duration: 262
Advertised Exhaust Duration: 268
Advertised Duration: 262 int./268 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.507 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.527 in.
Valve Lift with Factory Rocker Arm Ratio: 0.507 int./0.527 exh.
Lobe Separation (degrees): 112/108


...either that or the CC XE262...?

Why is picking a cam such a hard choice?

Heads will be rebuild with new springs and roller tip rockers.
UBERK is offline  
post #40 of 184 Old 01-14-2014, 02:35 PM Thread Starter
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480
Posts: 589
Im very curious about my block though... Pass side of block clearly has "401" cast into it...drivers side just has "01"....some sort of casting error?





...just a few other casting marks:

This "4" is only on pass side:



but a "4" also appears in the oil galley...











Rods all ahve the is PN, but also have what appears to be a 7-8-9 or 10 towards the bottom?

UBERK is offline  
post #41 of 184 Old 01-14-2014, 02:42 PM
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert
Posts: 17,349
I like your cam choice, but I wouldn't buy the "AMC kit". The valve springs in my Lunati kit weren't even close to fitting on my 360.

Perhaps they've fixed that problem....

Matt


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.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Matt1981CJ7 is offline  
post #42 of 184 Old 01-14-2014, 02:47 PM
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert
Posts: 17,349
Check this thread regarding casting numbers.

Matt


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.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Matt1981CJ7 is offline  
post #43 of 184 Old 01-14-2014, 02:54 PM Thread Starter
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480
Posts: 589
Quote:
Originally Posted by Matt1981CJ7 View Post
I like your cam choice, but I wouldn't buy the "AMC kit". The valve springs in my Lunati kit weren't even close to fitting on my 360.
I didnt see a Lunati "kit" per se on Summit...the cam only comes with lifters. Id have to spec out springs seperately. Ill check Lunatis web site.

Otherwise its the CC XE262 "kit"...cam-lifters-springs-valve seals and double roller timing set.....
UBERK is offline  
post #44 of 184 Old 01-14-2014, 02:56 PM
swatson454
Registered User
1983 CJ7 
 
Join Date: May 2009
Location: Texas Hill Country
Posts: 6,514
Quote:
Originally Posted by UBERK View Post

Why is picking a cam such a hard choice?
Because there's about 2 million choices and as many opinions out there

I use Vizard's 128 to come up with the timing events needed to hopefully build the maximum amount of torque the engine is capable of producing at the rpm you want it done. That may not always be the goal so at that point, the options become endless.

I'm sure you can't go wrong with either one.



Shawn

Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is offline  
post #45 of 184 Old 01-14-2014, 04:01 PM
swatson454
Registered User
1983 CJ7 
 
Join Date: May 2009
Location: Texas Hill Country
Posts: 6,514
Using Vizard's approach, I just ran some numbers specific to a 401 used for low-speed stuff (just off idle to probably a 5,200 max rpm) where a good idle was expected.

Based on your cylinder size and the valve area available to feed it, I came up with 50 degrees of overlap and required 106 LSA which, mathematically, leaves you at 262 degrees of duration. That may give you a little bit of a rumble under the hood but the torque would be insane.

If that isn't what you're looking for, you can always just widen the LSA out a little. Going from a 106 out to 110 or 112 will knock a good 45 ft/lbs off the torque and make it idle smooth as a baby's butt but you'll sure be able to feel the reduced power and throttle response.

If you were doing a towing application where mileage was a factor, we'd probably drop the duration down to 256 and use a 110 LSA.

One thing I really dislike about the way Comp does their cams, especially on an AMC with a 1.65 exhaust valve, is using too much exhaust duration. In a low-speed application where mileage may or may not be a factor, that extra exhaust duration works against us. Getting closer to the same area as the intake will make more torque below the torque peak and will help with mileage. It will fall off faster as it revs beyond peak torque but that doesn't seem to matter on these applications.

Anywho, that's just how I might approach it. Sure beats reading cam descriptions until your eyes bleed


Shawn

Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 Off
Pingbacks are On
Refbacks are On

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