Cylinder Scratch Hone or Bore? - Chevelle Tech
Chevelle Tech join team chevelle as a supporting member  
Chevelle Parts at SS396.com      
GROUND UP & SS396.com         
Official Sponsor of Team Chevelle
     

Auto Insurance

Chevelles.com is the premier Chevrolet Chevelle Forum on the internet. Registered Users do not see the above ads.
Engine AdvertisementGeneral Engine Discussion.

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old Sep 16th, 05, 11:08 PM
frankg70ss frankg70ss is offline
Tech Team
 
Join Date: Nov 2002
Location: Clarks Summit Pa USA
Posts: 213
Default Cylinder Scratch Hone or Bore?

I have a 454 that was rebuilt and has about 5K on it.I pulled the heads and checked the cylinders and one has a scratch that you can feel with tour fingernail.The motor is already boared .040 over.My question is can I get by with hoening out the cylnder or going to .060 over.How much does a hone remove frome the cyl?I am buying new pistons to raise the compression anyway so would it be best to start with a fresh bore?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old Sep 16th, 05, 11:50 PM
Schurkey Schurkey is offline
Gold Founding Member
 
Join Date: Aug 1998
Location: the Seasonally Frozen Wastelands
Posts: 9,354
Default Re: Cylinder Scratch Hone or Bore?

"It all depends".

You need to hone enough to eliminate the scratch--so how deep is the scratch?

You need to consider piston-to-wall clearance. What clearance do you have now, and what clearance is recommended for your new pistons? What EXACT size are your current pistons, and what EXACT size are the new ones?

I would consider going to .060 over, I'm thinking there's a better selection of pistons than what's available at .040--but I can't say I've researched that.
Reply With Quote Quick reply to this message
  #3  
Old Sep 17th, 05, 12:00 PM
frankg70ss frankg70ss is offline
Tech Team
 
Join Date: Nov 2002
Location: Clarks Summit Pa USA
Posts: 213
Default Re: Cylinder Scratch Hone or Bore?

The scratch is not very deep about .0001.You can hardley feel it with you finger nail.It's more of a scuff than a scratch .I hate to go to .060 if I don't have to because these blocks are getting harder to find.SpeedPro ha a .040 piston in hypertech that requires a .0015 skirt clearence.I am sending it out to have the cam bearings replaced and have the cyl's honed.I was suprised with the number of .040 pistons out there.
Reply With Quote Quick reply to this message
  #4  
Old Sep 17th, 05, 3:25 PM
BillsCamino BillsCamino is offline
Gold Founding Member
"Wild Bill"
 
Join Date: Feb 2000
Location: Marietta, GA 30066
Posts: 24,113
Send a message via AIM to BillsCamino
Default Re: Cylinder Scratch Hone or Bore?

Quote:
Originally Posted by frankg70ss
The scratch is not very deep about .0001.You can hardley feel it with you finger nail.
You would not be able to see a scratch .0001" deep, much less feel one.
If you're able to hang nail on it, it's probably closer to .003" or more. Removing a defect that deep will require honing .006" (.003 per side) out of the bore.
Since you need to by pistons anyhow...bore .060" over and be done with it.
__________________
'70 Chevy Greenbrier Wagon
Turbo Jet 400 LS3, TH400, 3.31 posi 12 bolt

Team Chevelle #613
ACES #3920
CAMI (Ireland) #14
CanAm Chevelles #136
Carolina Chevelles #185
Heart Of Dixie #231
Long Island Chevelles #113
Reply With Quote Quick reply to this message
  #5  
Old Sep 17th, 05, 9:46 PM
pdq67 pdq67 is offline
Guest
Paul
 
Join Date: Jan 2001
Location: Columbia, MO, USA
Posts: 14,685
Thumbs up Re: Cylinder Scratch Hone or Bore?

Dingle-berry hone her AND put it back together with new rings AND run her!!

pdq67
Reply With Quote Quick reply to this message
  #6  
Old Sep 18th, 05, 2:04 AM
figbash figbash is offline
Senior Tech Team
Tom
 
Join Date: Sep 2000
Location: Farmington Hills MI
Posts: 1,505
Default Re: Cylinder Scratch Hone or Bore?

All you can do at home is hone the cylinder walls to seat the new rings. To remove a groove from the cylinder wall will require that the block be bored to the next piston size by a machine shop. If you are putting new pistons in, now would be the time to do it. Look on the bright side; you'll pick up about four extra cubic inches of displacement with the bore job.

Tom
__________________
1972 CHEVELLE SS
Reply With Quote Quick reply to this message
  #7  
Old Sep 18th, 05, 10:53 AM
mls48341 mls48341 is offline
Tech Team
Mark
 
Join Date: Jun 2002
Location: pontiac,mi,usa
Posts: 375
Talking Re: Cylinder Scratch Hone or Bore?

If it isn't smoking, using oil, or showing a difference in compression readings,
I'd leave it alone.
If it needs more than a couple thousandths removed, it should be bored or you'll have excessive piston to wall clearance.
JMHO.
__________________
1996 SS Camaro. 565 on a 28" x 10.5" tire. All motor.
Reply With Quote Quick reply to this message
  #8  
Old Sep 18th, 05, 5:31 PM
chev-hell chev-hell is offline
Senior Tech Team
John
 
Join Date: Jul 1999
Location: Ft.worth,Tx
Posts: 1,450
Default Re: Cylinder Scratch Hone or Bore?

depending on what it comes out at after honing, my builder thinks that 8 thousands of cyl to piston clearance is fine, you won't hear it, no oil consumption difference and no slap. minehad a light scratch like yours, he's honed it and got almost every bit of it out, but not all, beed blasted the pistons and will re-use them... he assures me i'll never tell, the pistons were tight to begin with... i'd as you builder what kinda clearance you'd have after a hone and have the pistons checked, if they are a tad big anyway, and the cyls maybe small you have a good chance to just hone and go (have the pistons cleaned up though)
__________________
SOLD, Divorce sux
1970 SS396
454 572HP
Tremec TKO-600
GOLD Member #783
Reply With Quote Quick reply to this message
  #9  
Old Sep 19th, 05, 7:34 AM
hilljack hilljack is offline
Tech Team
 
Join Date: Dec 2000
Location: orangevale, ca, us
Posts: 995
Default Re: Cylinder Scratch Hone or Bore?

Was it doing anything wrong in the first place? If not I wouldn't mess with it.

Is the scratch from the ring gaps or some unknown source?
Reply With Quote Quick reply to this message
  #10  
Old Sep 19th, 05, 6:00 PM
Shawn Gilbert Shawn Gilbert is offline
Senior Tech Team
Shawn
 
Join Date: Sep 2005
Location: Missouri
Posts: 1,306
Default Re: Cylinder Scratch Hone or Bore?

chev-hell,

I know im new here, but i have had several experiances with piston sidewall to cylinder clearance issues. At .008 you will definately hear piston slap and it will rock in the bore prematurely wearing spots on the piston and be more prone to galling ect. It all depends on the composition of the piston material he mentioned hyper's which use a very tight clearance his example was .0015 they use this tight clearance because they do not expand under heat like a forged alloy. This makes them great street engine pistons because they are stable in the bore and long wearing with good ring seal properties. I put a set of those in at about 3.5-4 ( same as my old pistons ) and they rattled their ass off. Older TRW forged slugs ( heavy beast they were ) required about .006 because of their expansion charactoristics and at .008 they would probably be fine after they got warmed up. Most of your modern forged alloys use a sidewall clearance in the range of .004 to .0045 trust me from experiance just follow the piston manufacturers recommendations the best you can afford. RPM is another issue the effects of sidewall clearance issues are amplified the higher the RPM you turn the engine. IF you plan to buy new Hyper's and install them at the recommended .0015-.0025 most of them run then i strongly urge you to consider boring on out to .060 and starting fresh. However you might get your machinist to remove the scratch and measure the bore because if he doesnt have to remove to much you might be able to buy a piston to suit the increased bore diameter and still meet the recommended clearance.

For example if you had run hypers before installed at .002 and he grinds 4 out to get the scratch out you could then buy a set of cheaper pistons that require .006 clearance and your set at .040. The reason i know all this is these 400 blocks i have been running are getting scarce and can only be bored .040 ive been through all of this on the success side and failure side.

JMHO
Shawn
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply
Chevelle Tech > Mechanical > Engine      Current Topic: Cylinder Scratch Hone or Bore?
Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user 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. Note, you will be sent a confirmation request to this address.
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.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to check for fractures in cylinder bore Bomber '67 Engine 5 Oct 7th, 04 10:02 PM
Master cylinder bench bleed question MikeD70Malibu Brakes, Suspension & Steering 2 Aug 5th, 04 10:45 PM
maximum cylinder wear before bore sweet71 Engine 7 Mar 3rd, 04 9:58 PM
Cylinder Bore Size !! chvyscott67 Engine 3 Jul 31st, 03 9:35 PM
cylinder hone Chopper Engine 3 Dec 7th, 02 8:53 AM


All times are GMT -4. The time now is 8:10 AM.


Is there a site like this for?    El Caminos Camaros Novas Impalas GTO Chevy Punch All Chevys

2009 Team Chevelle - AutoForums