Hastings Plasma-Moly Ring Hone - 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
  #1 (permalink)  
Old 04-23-2009, 09:54 AM
Registered User
 
Last photo:
Join Date: Mar 2008
Location: NC
Posts: 237
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Hastings Plasma-Moly Ring Hone

I have read that Moly and Plasma-Moly top compression rings need a final hone that is fine; around 600 grit. However Hastings recommends 280 grit (talked to tech support). Also from their documentation"

Quote:
CYLINDER ROUGHNESS
Substantial controversy exists on the correct cylinder roughness for proper seating of piston rings, whether chrome, moly, or plain cast iron. It has been our experience that the use of 220-280 grit stones and achieving proper cross hatch angle produces a finish compatible to all three types of the above rings.
Anybody know why the difference in recommended roughness ? 600 vs 280 is a significant difference. Is is just Hasting that recommends this. I just want to confirm the correct hone for my application. I beleive they are Hastings Powerflex rings. Thanks.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-23-2009, 10:30 AM
Registered User
 
Last photo:
Join Date: Mar 2008
Location: Ringgold, Ga.
Posts: 454
Wiki Edits: 0

Thanks: 1
Thanked 17 Times in 16 Posts
That does sorta make you wonder about their recommendation a little! I have always used Sealed Power rings for anything other than just High boosted or Nitrous applications that require something more exotic. And most of the regular moly equipped engines i've built get a much finer final hone than just a 600 grit. I have never considered Hastings to be a "top shelf" brand for any performance application, and none of the top engine builders in any of the motorsports fields that I personally know, use them either. They might be a decent middle of the pack product, and have their own methods for block preparation and recommendations. But if you follow their advice and have a sealing issue....then what, are they going to give you a whole new song and dance that they didn't tell you to begin with, or will they step up to the plate and address your problem(if you will even have one, just hypothetically speaking). Im sure others on here might have used their products in the past and might not have had any issues, that can expand on their experiences with the cylinder finish recommendations.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-23-2009, 10:35 AM
Registered User
 
Join Date: Nov 2005
Location: Duffield ,Va
Age: 67
Posts: 526
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I use the 280 grit on my Hasings Flex Racing rings and have not had any problem so far. I don't even have a 400 or 600 grit for my hone, not saying they are not required sometimes but I haven't used them. Someone else may clarify that.



Quote:
Originally Posted by y2k600f4
I have read that Moly and Plasma-Moly top compression rings need a final hone that is fine; around 600 grit. However Hastings recommends 280 grit (talked to tech support). Also from their documentation"



Anybody know why the difference in recommended roughness ? 600 vs 280 is a significant difference. Is is just Hasting that recommends this. I just want to confirm the correct hone for my application. I beleive they are Hastings Powerflex rings. Thanks.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-23-2009, 10:37 AM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,822
Wiki Edits: 0

Thanks: 4
Thanked 449 Times in 384 Posts
Quote:
Originally Posted by y2k600f4
I have read that Moly and Plasma-Moly top compression rings need a final hone that is fine; around 600 grit. However Hastings recommends 280 grit (talked to tech support). Also from their documentation"



Anybody know why the difference in recommended roughness ? 600 vs 280 is a significant difference. Is is just Hasting that recommends this. I just want to confirm the correct hone for my application. I beleive they are Hastings Powerflex rings. Thanks.
Different ring finishes (chrome, moly, plain) prefer different wall finishes. Chrome will tolerate and needs a course finish to assist break in of the surfaces. A raw iron ring also like a rough finish but for a different reason which is more oil retention in the wall. The chrome ring doesn't need so much oil on the wall but needs to shape the wall to its contours.

Moly prefers a smoother wall to prevent early wearing of the coating. Moly lke chrome doesn't need as much upper cylinder lube but gets there by supplying its own slipperiness where chrome is simply resistant to wear in a low lubrication environment.

However super smooth walls as you get with a 600 finish tends to be too smooth, the current thinking is what's called plateau honing which combines both rough and smooth features. This process first puts a 250-300 finish on the wall then comes back with a 400-600 stone to break the rough edges of the first coarser cut. This provides both more oil retention in the coarse hatch for the lower rings and the thrust skirt with a smoother surface from the finer hatch that the moly ring likes.

Bogie
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-23-2009, 11:11 AM
Registered User
 
Last photo:
Join Date: Mar 2008
Location: NC
Posts: 237
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
This process first puts a 250-300 finish on the wall then comes back with a 400-600 stone to break the rough edges of the first coarser cut. This provides both more oil retention in the coarse hatch for the lower rings and the thrust skirt with a smoother surface from the finer hatch that the moly ring likes.
Makes total sense and I have read about this method, seems the norm. Why don't these manufacture's recommendations line up with industry standards? Makes me wonder that possibly the manufacture's don't know their own products and are not concerned about early "sanding" of the moly finish due to a courser hone.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-23-2009, 06:13 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,822
Wiki Edits: 0

Thanks: 4
Thanked 449 Times in 384 Posts
Quote:
Originally Posted by y2k600f4
Makes total sense and I have read about this method, seems the norm. Why don't these manufacture's recommendations line up with industry standards? Makes me wonder that possibly the manufacture's don't know their own products and are not concerned about early "sanding" of the moly finish due to a courser hone.
Probably an old recommendation that should be updated but likely won't be.

Bogie
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



All times are GMT -6. The time now is 06:55 AM.


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.