Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> Ford 460 low compression and rough idle
User Name
Password
lost password?   |   register now

Thread: Ford 460 low compression and rough idle Reply to Thread
Title:
  
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last 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:

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.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
11-25-2012 12:40 PM
Infinite Monkeys
Quote:
Originally Posted by vinniekq2 View Post
just rent/borrow a guage and you need a low pressure compressed air source
Just checked with Autozone. They have them in the "rent a tool".
Thanks
11-25-2012 11:32 AM
vinniekq2 just rent/borrow a guage and you need a low pressure compressed air source
11-25-2012 11:06 AM
Infinite Monkeys
Quote:
Originally Posted by timothale View Post
You can knock out the center of an old spark plug and weld an air fitting to it for a quick and dirty test.
That sounds good. The one's I've been looking at have gages, is that important? without a gage, I guess I would be able to go only with what I can hear?

Thanks
11-25-2012 10:26 AM
timothale
spark plug fitting.

You can knock out the center of an old spark plug and weld an air fitting to it for a quick and dirty test.
11-25-2012 10:03 AM
Infinite Monkeys Time to buy a leak down tester......

I've rebuilt one engine before, an air cooled VW, worked out well, but I don't think I want to mess with this one. Ill probably buy a crate engine. They're in the range of about $1700. Not too bad.

I'm hoping it won't have to come to that and maybe I can get by with spending a few hundred instead of a couple grand.
So for now, a leak down and a compression test. I'll repost with results.

The other issue is probably really worn out piston rings???
Thanks
11-25-2012 09:27 AM
timothale
timing chain.

A bad timing chain would cause all the cylinders to be about equally low. there is some other problem also, You can check the timing chain by pulling the dist cap, watching the rotor and turning the crank pully with a wrench, then seeing how much rotation in the opposite direction before the rotor moves. and you get a few more ponies by using a double roller chain and setting the gears dead on , the smog 460's ran retard on the cam as a cheap way of emission reduction.
11-25-2012 09:21 AM
vinniekq2 do a cylinder leak down test. The rough idle is from running on 6 cylinders
11-25-2012 08:55 AM
Infinite Monkeys
Ford 460 low compression and rough idle

I just got a F350 with a 460 with 160,000 miles. I'm told by the PO that it has low compression in two cylinders (# 1 and #5). It's not drivable, but it starts. I let it idle for about 10 minutes and I saw lots of gray smoke from the tail pipe and none from the oil fill hole.
This makes me think that the piston rings are bad, but the heads are good, is this a correct assumption?

Second; the rough idle could be a stretched timing chain, correct???

Also, can the timing chain be the cause and cure for low compression?

Thanks

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


All times are GMT -6. The time now is 08:27 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.