Mechanical timing with comp cam... weird compression numbers - JeepForum.com

 
LinkBack Thread Tools
post #1 of 10 Old 04-09-2013, 07:52 PM Thread Starter
95yj0645
Registered User
1995 YJ Wrangler 
 
Join Date: May 2010
Location: indiana
Posts: 365
Mechanical timing with comp cam... weird compression numbers

I am trying to start my new 4.6L I built for the yj and it is way out of time. tried setting up the distributor multiple times with no such luck. I finally ran a compression check and I get 50psi on cyl 1 and cyl 6. 2,3,4,5 all have 150 psi. pulled the timing cover and it appeared my chain had moved half a tooth (A to Z brand chain) went and bought a cloyes tonight ( the one I wanted to begin with `). set it up and decided that before I put the cover on I should crank it over and check the compression on those cylinders and they are the exact same, still 50psi. I am running a comp 68-235-4 extreme 4x4 cam. should I try advancing the cam gear ? I am getting frustrated. It has a .030 bore with new pistons and all of my rings were set up and measured exactly the same way. HELP ! this is my only vehicle.

95yj0645 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 04-09-2013, 09:09 PM Thread Starter
95yj0645
Registered User
1995 YJ Wrangler 
 
Join Date: May 2010
Location: indiana
Posts: 365
AHHHH! after doing a little more searching on the forum it looks like I timed it on TDC exhaust and not TDC compression now im not sure of my cam position. I guess im going to have to start from scratch tomorrow and pull the valve cover and rotate my cam until both valves are closed on number 1 and then set up my crank. Thank God these are non interference engines..
95yj0645 is offline  
post #3 of 10 Old 04-10-2013, 10:00 AM Thread Starter
95yj0645
Registered User
1995 YJ Wrangler 
 
Join Date: May 2010
Location: indiana
Posts: 365
Bump

'95 YJ, 4.6L stroker, Ford 8.8, AX15, SYE, SOA, Cage kit, full armor, 35" MT/R Kevlar's
95yj0645 is offline  
post #4 of 10 Old 04-10-2013, 01:00 PM
youngjeepr
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2009
Location: layton UT
Posts: 2,521
What size cam did you get? What is your ENGINE timing set at?

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

Utah Jeep Crew



Build Thread
youngjeepr is offline  
post #5 of 10 Old 04-12-2013, 05:07 AM Thread Starter
95yj0645
Registered User
1995 YJ Wrangler 
 
Join Date: May 2010
Location: indiana
Posts: 365
Engine timing is stock .. Ended up taking timing chain off and rocker arms off and running a compression test getting terrible results. 1-25psi,2-40psi,3-75psi, 4-150,5-140,6-25psi. I pulled the head and 8 out of 12 valves were leaking after my supposed valve job I paid for! Here are some pics after I filled the head with water and set it on it's side.

image-3897088547.jpg



image-3554681932.jpg



image-3613683404.jpg



image-2641039742.jpg

'95 YJ, 4.6L stroker, Ford 8.8, AX15, SYE, SOA, Cage kit, full armor, 35" MT/R Kevlar's
95yj0645 is offline  
post #6 of 10 Old 04-12-2013, 08:27 AM
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
Posts: 3,750
I would have used oil not water. You can already see the rust forming. Load that pupy up with some kind of oil to get the moisture out. I would also take it back and have the valve job redone on thier dime since they half ***** it.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
Siva283 is offline  
post #7 of 10 Old 04-12-2013, 08:46 AM
youngjeepr
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2009
Location: layton UT
Posts: 2,521
Wouldn't oil be to thick? I've always used water or coolant

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

Utah Jeep Crew



Build Thread
youngjeepr is offline  
post #8 of 10 Old 04-12-2013, 09:15 AM
Jeepsr4me
Registered User
 
Join Date: Dec 2004
Posts: 8,831
No u use ALCOHOL ..... Not water... or oil.. Oil to thick.
I have verified 100s of valves and alcohol will not pass by a good seal.
Jeepsr4me is offline  
post #9 of 10 Old 04-13-2013, 04:47 AM Thread Starter
95yj0645
Registered User
1995 YJ Wrangler 
 
Join Date: May 2010
Location: indiana
Posts: 365
Who wants to waste alcohol .. Nonetheless I took the head back and they went through it again and it's ready to be picked up (they cleaned the rust ). They did however try telling me a slight amount of seepage is normal until the valves wear in (after the engine runs for awhile). However, I feel like that was a bit excessive , considering it only took about 5 min for cyl 1 and cyl 6 to start leaking that bad.

'95 YJ, 4.6L stroker, Ford 8.8, AX15, SYE, SOA, Cage kit, full armor, 35" MT/R Kevlar's
95yj0645 is offline  
post #10 of 10 Old 04-13-2013, 05:15 AM
Jeepsr4me
Registered User
 
Join Date: Dec 2004
Posts: 8,831
You may need to find another machinist. Once you lap those valves in, they seal pretty good.
Rubbing alcohol is what I use... You no drink that..
Jeepsr4me 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