Fresh 383 compression - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #16 (permalink)  
Old 06-26-2012, 06:36 AM
Registered User
 
Join Date: Feb 2012
Posts: 25
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Engine has prob 45 min run time. And only drove it prob 5 miles. No tags no insurance. I have flat top srp pistons and dart pro 1 64cc heads. Should have around 10:1 compression some where around there.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 06-26-2012, 06:40 AM
Registered User
 
Join Date: Feb 2012
Posts: 25
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Oh yeah and to freshen it up I went they the whole motor all new bearings rings gasket oil pump. Everything new
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 06-27-2012, 05:05 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,021
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
was it bored or honed or the bores checked for straightness?

what cam?

ring sealing should improve with more miles.
Reply With Quote Quick reply to this message
  #19 (permalink)  
Old 06-27-2012, 06:36 AM
Registered User
 
Join Date: Feb 2012
Posts: 25
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It was bored years ago. Has two sleeves in the block. Haven't had it checked for straightness since bored. It has a Lanati voodoo cam. 600 lift 110 love separation. Can't remember duration off top my head. My compression test I ran is all over the board. Goes from lowest cylinder being 110 and the highest being 145 and the rest inbetween. From what I hear there shouldn't b that much of a difference. And I checked my blow by. When I first crank it up it has no blow by. After it warms up it's has a little at idle but if raise the rpm to say 1500-2000 rpm there is no blow by. Im stumped. Maybe bad rings. Maybe worped cylinder. Idk. Besides it blowing the intake gasket it runs great in my opinion.
Reply With Quote Quick reply to this message
  #20 (permalink)  
Old 06-27-2012, 10:58 AM
Registered User
 
Last photo:
Join Date: Jan 2011
Location: Hopewell, Va
Age: 62
Posts: 1,187
Wiki Edits: 0

Thanks: 0
Thanked 117 Times in 113 Posts
383 manifold gasket

I have always used the cork gaskets at the front and rear of the intake. I use 3M Super Weatherstrip and Gasket Adhesive, 5 oz. Tube - Yellow to glue the gasket to the block and a thin layer of Permatex Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker between the gasket and manifold. Be sure and put a bead of Permatex at the gasket ends. I let it set about 24 hours. I always had problems with leaks when I used the rubber gaskets on the front and back.
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 06-27-2012, 11:49 AM
Registered User
 
Join Date: Feb 2012
Posts: 25
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It's not just a leak it's literally blowing the gasket out the back of the intake. But if I had enought crank case pressure to blow it out I should have major blow by. But I don't. ??????????????????i just don't know
Reply With Quote Quick reply to this message
  #22 (permalink)  
Old 06-27-2012, 12:46 PM
Registered User
 
Last photo:
Join Date: Jan 2011
Location: Hopewell, Va
Age: 62
Posts: 1,187
Wiki Edits: 0

Thanks: 0
Thanked 117 Times in 113 Posts
manifold gasket

Clean everything again and set the intake manifold in place with no gasket. Check the gap in the front and back. The gap should be smaller than the thickness of the gaskets. Like I said I tried glue with the rubber gaskets and they would always slip back out. I would throw them away and use Permatex. Are you torquing the bolts in sequence? Do the bolts have flat washers installed with them? Also after warm up re-torque bolts again.
Reply With Quote Quick reply to this message
  #23 (permalink)  
Old 06-27-2012, 01:00 PM
Registered User
 
Join Date: Feb 2012
Posts: 25
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I used permatex the last time and let it set for a day and a half. But I'm going to pull it apart again and see what happens. Yes I have bolts with washers. Wish me luck.
Reply With Quote Quick reply to this message
  #24 (permalink)  
Old 06-27-2012, 02:53 PM
Registered User
 
Join Date: Dec 2010
Location: Montrose, CO
Posts: 33
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
The Right Stuff

The best trick i have for sealing the front and rear of the intake manifold is to use a spring loaded punch and punch about 100 or so holes throughout the length of the front and rear walls then use the Right Stuff (1/4" bead) and that seems to seal up the best and prevents blowouts. Good luck that is a weird issue.
Reply With Quote Quick reply to this message
  #25 (permalink)  
Old 06-27-2012, 04:06 PM
painted jester's Avatar
TAKE A KID TO A CAR SHOW
 

Last journal entry: Take a kid to a car show
Last photo:
Join Date: Jan 2011
Location: Central Michigan
Age: 68
Posts: 1,789
Wiki Edits: 0

Thanks: 100
Thanked 269 Times in 220 Posts
Quote:
Originally Posted by Michael 9111
383 keeps blowing back intake gasket out. Ran compression test and all cylinders had from 120 to 145 of compression. I hear that's low but this motor always has had around that much. I didn't degree in the cam just lined up the dots. But it's still blowing intake gasket out. Any thoughts on any of this or opinions?? Any help is greatly appreciated.

120 to 145 is a big differance on a freshened eng a 20 percent difference isn't except able take a wet compression check and see if pressures increase and level out, my guess is your rings are shot. And the blow by is pushing your gasket out!

Jester
Reply With Quote Quick reply to this message
  #26 (permalink)  
Old 06-27-2012, 06:32 PM
68NovaSS's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Working with chromed bolts
Last journal entry: New to me T-Bucket
Last photo:
Join Date: Sep 2002
Location: Nine Mile Falls, Washington
Posts: 5,223
Wiki Edits: 9

Thanks: 102
Thanked 131 Times in 122 Posts
You're doing the compression test with the throttle blocked open, right? Just had to ask, it's about the only thing that hasn't been mentioned.
__________________
Boost adds dignity to what would otherwise be a vulgar brawl...

Midnight Sun Street Rod Association
Reply With Quote Quick reply to this message
  #27 (permalink)  
Old 06-27-2012, 08:03 PM
Registered User
 
Join Date: Feb 2012
Posts: 25
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I've done the compression test both ways throttle opened and closed and came up with the same numbers. How do u do a wet compression test?? Never done that b4. But one of my buds just brought me a leak down tester. Should I do the leak down or wet test?? Which is better
Reply With Quote Quick reply to this message
  #28 (permalink)  
Old 06-27-2012, 08:06 PM
Registered User
 
Join Date: Feb 2012
Posts: 25
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
And the motor only has little blow by at idle none after I rev it up. And when I plug my PVC valve back in and leave my other hole in valve cover opened the PVC sucks it all up and I don't see any then. So I'm thinking if it's got enough blow by to push a gasket out then it should b pouring out the breather hole
Reply With Quote Quick reply to this message
  #29 (permalink)  
Old 06-27-2012, 08:38 PM
68NovaSS's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Working with chromed bolts
Last journal entry: New to me T-Bucket
Last photo:
Join Date: Sep 2002
Location: Nine Mile Falls, Washington
Posts: 5,223
Wiki Edits: 9

Thanks: 102
Thanked 131 Times in 122 Posts
The wet test is squirting a couple shots of oil into the cylinder and take the test. I give a test 5 compression strokes, or until the needle stops climbing.

The throttle has to be at WOT for an accurate compression test.
__________________
Boost adds dignity to what would otherwise be a vulgar brawl...

Midnight Sun Street Rod Association
Reply With Quote Quick reply to this message
  #30 (permalink)  
Old 06-27-2012, 08:46 PM
Registered User
 
Join Date: Feb 2012
Posts: 25
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
This may be a dumb question but from researching does the motor need to b warm to perform a compressiontest???I've only done the compression test when my motor hasn't been running all day. I have custom exhaust bc I have this motor in a mustang and there's no way of running a compression test on my motor while hot unless I burn my wrists to blisters????FORD TOUGH WITH CHEVY STUFF
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fresh 383 burns up pistons brad33478 Engine 46 05-15-2014 10:50 AM
383 fresh build issues... imagine that big_c_snow Engine 6 05-01-2012 07:37 AM
Fresh 383 build some rockers not getting oil palmertree Engine 12 08-14-2010 09:11 AM
Fresh 383 overheat wit1010 Engine 4 05-09-2007 05:09 PM
fresh 383 - knock, smoke and a starter qs darom Engine 36 04-04-2005 04:48 AM


All times are GMT -6. The time now is 02:51 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.