Page 1 of 3 123 LastLast
Results 1 to 15 of 35
  1. #1
    Newbie
    Join Date
    Jul 2018
    Location
    WA
    Posts
    24

    Default To bore or to sleeve, that is the question

    Hi guys,

    I had an engine failure on a track day race motor of mine. Long story short, basically damaged one piston and bore. Piston needs replacing obviously, but the bore needs to be bored out. Block is a Dart SHP, piston size is 4.125

    Now I have two choices.

    1. Sleeve the damaged bore and replace with new piston of same size, or
    2. Bore out entire block with next size up piston 4.155.

    pros and cons of each option what I can see are;
    1. got a sleeve in a new block which eats at me. but its cheaper. Block boring and one sleeve basically same $$. One piston obviously cheaper than 8. ($150 vs $900)
    2. More expensive option. But get an increase in engine capacity = more power, how much? is it worth it?. Make good outa bad and get an increase in capacity, no substitute for displacement. Also boring out block eats into its life span, but is this an issue?

    So just after what your thoughts are and what you would do?

    Thanks

  2. #2
    254RWHP boat anchor EVL253's Avatar
    Join Date
    Nov 2006
    Location
    bathurst
    Posts
    5,227

    Default

    if it was me get a good sleeve job done. the few cubes aernt going to make a huge power increase
    11 second E85 bottle fed boat anchor

  3. #3
    Newbie
    Join Date
    Jul 2018
    Location
    WA
    Posts
    24

    Default

    Quote Originally Posted by EVL253 View Post
    if it was me get a good sleeve job done. the few cubes aernt going to make a huge power increase
    Thanks mate. Yea, prob not a massive power increase, and wouldn't notice it. Its more about the best job. A re-bore would be neater and cleaner. The sleeving is eating at me a bit. A bit old school. Id prob forget all about it once engine all back together tho. Plus its cheaper.

    My gut feeling is going the re-bore to 4.155

    arrrgh, decisions

  4. #4
    Do you ever leave? paulzig's Avatar
    Join Date
    Oct 2008
    Location
    Gold Coast
    Posts
    15,786

    Default

    I would go straight to the bigger bore size... If you need another freshen how long would that be? they can go to 4.185...

    The sleeve would make me not be able to sleep well at night, Im the same... The sleeve might be 100% fine, but you know, what price your piece of mind, mental health is important...

  5. #5
    Part of the furniture monaroman76's Avatar
    Join Date
    Apr 2012
    Location
    Adelaide
    Posts
    1,100

    Default

    Yeh I'd say go the re-bore, it's not as though you're trying to preserve a matching numbers engine. They still make em

    Without exactly knowing your stroke, you probably stand to pick up 6-7 cubes. Assuming 1.5 horsepower per cube, that's another 10hp, nothing to sneeze at.

  6. #6
    Do you ever leave? paulzig's Avatar
    Join Date
    Oct 2008
    Location
    Gold Coast
    Posts
    15,786

    Default

    Quote Originally Posted by monaroman76 View Post
    Without exactly knowing your stroke, you probably stand to pick up 6-7 cubes. Assuming 1.5 horsepower per cube, that's another 10hp, nothing to sneeze at.
    its In the Ford section so the most common are the '363' 8.2" deck 4.125 bore 3.4 stroke or the larger 9.5 deck with a 4.125 bore 4" stroke making a 427..

    This is not a Holden a Ford will make more than 1.5 ... 1.7+

  7. #7
    Senior Member
    Join Date
    Feb 2013
    Location
    lurking in the shadows
    Posts
    465

    Default

    If it was me, I'd bore the one pot that needs it rather than the whole block. Its a race motor (and a ford ) you'll break it again.

  8. #8
    Part of the furniture
    Join Date
    Jan 2017
    Location
    Nth Qld
    Posts
    1,050

    Default

    Hi
    Detailed measure of the block/pistons then consult with machinist . Can the "newbore "finish match the 7 older ones ??. How much wear is in the older bores/pistons ?
    Were u considering an upgrade of pistons ??
    Installed properly sleeves last the life of the block . Had plenty installed in alloy blocks that are suppose to move around a lot with great success. Eg Factory alloy block , cast iron sleeves are keyed in when cast apparently. Replacements are pressed in .

    Unless it goes 9000rpm with power adder regularly go the sleeve .

  9. #9
    Do you ever leave? paulzig's Avatar
    Join Date
    Oct 2008
    Location
    Gold Coast
    Posts
    15,786

    Default

    Quote Originally Posted by guy incognito View Post
    If it was me, I'd bore the one pot that needs it rather than the whole block. Its a race motor (and a ford ) you'll break it again.
    So you want a 1x 4.155 piston and the rest 4.125?

    The ford doesnt break, I suspect some shady goings on maybe sabotage...

    If it was mine they'd all go the next oversize if it could...

  10. #10
    Newbie
    Join Date
    Jul 2018
    Location
    WA
    Posts
    24

    Default

    yea all will be 4.155, or if I was to sleeve, then just one new 4.125
    Last edited by TKFD; 30-05-2019 at 11:51 AM. Reason: change

  11. #11
    Newbie
    Join Date
    Jul 2018
    Location
    WA
    Posts
    24

    Default

    Quote Originally Posted by paulzig View Post
    I would go straight to the bigger bore size... If you need another freshen how long would that be? they can go to 4.185...

    The sleeve would make me not be able to sleep well at night, Im the same... The sleeve might be 100% fine, but you know, what price your piece of mind, mental health is important...
    Thanks Paulzig, yea my thoughts too, sleeving feels like a band-aid fix in my head (although I know its more than that)

  12. #12
    Newbie
    Join Date
    Jul 2018
    Location
    WA
    Posts
    24

    Default

    Quote Originally Posted by paulzig View Post
    its In the Ford section so the most common are the '363' 8.2" deck 4.125 bore 3.4 stroke or the larger 9.5 deck with a 4.125 bore 4" stroke making a 427..

    This is not a Holden a Ford will make more than 1.5 ... 1.7+
    yep, its a 8.2 deck. currently a 4.125 bore with 3.400 stroke
    Last edited by TKFD; 30-05-2019 at 11:48 AM. Reason: c

  13. #13
    Newbie
    Join Date
    Jul 2018
    Location
    WA
    Posts
    24

    Default

    I think ive made the decision to rebore whole block. Even tho most expensive option, my gut feeling is better, I get fresh new pistons (even tho old ones still ok, besides broken one of course), its only 30thou, get fresh machined bores, these blocks can go out 4.2 (stretching it tho), and may pick up some power along the way.

    I looking into using gapless rings.

  14. #14
    Do you ever leave? paulzig's Avatar
    Join Date
    Oct 2008
    Location
    Gold Coast
    Posts
    15,786

    Default

    Quote Originally Posted by TKFD View Post
    yep, its a 8.2 deck. currently a 4.125 bore with 3.400 stroke
    Good deal the 8.2 deck stuff, nice and compact fits in anywhere... They look like a toy engine

  15. #15
    Do you ever leave? paulzig's Avatar
    Join Date
    Oct 2008
    Location
    Gold Coast
    Posts
    15,786

    Default

    Quote Originally Posted by TKFD View Post

    I looking into using gapless rings.
    Dont bother, use a quality conventional ring package... Go to something smaller like a .043 instead but if its a streeter stick with the 1/16 rings

Page 1 of 3 123 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. To sleeve or not to sleeve?
    By Fieds83 in forum Holden V8's
    Replies: 31
    Last Post: 19-02-2019, 05:37 PM
  2. Replies: 41
    Last Post: 11-01-2018, 06:40 AM
  3. Holden 304 re-sleeve
    By sme304 in forum Holden V8's
    Replies: 18
    Last Post: 02-03-2013, 10:33 AM
  4. Next question, piston to bore clearance
    By struth in forum Holden V8's
    Replies: 86
    Last Post: 11-04-2011, 06:04 AM
  5. Replies: 1
    Last Post: 20-07-2009, 05:07 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •