Fitting larger pistons to a 16v

1. wicked-vtr Saxperience Forum Bum Joined: Jan 2009 Surrey Posts: 2608 200sx s14a mark 1 vts

   #1 13th October 2010, 18:14

   If I wanted to fit larger pistons to my engine how would I go about it? Im assuming I would have to get the sleeves machined out? Would this drastically weaken them?
2. user_21226 Saxperience Post Whore Joined: Feb 2008 wirral Posts: 6348 Icelandic vtr turbo

   #2 13th October 2010, 18:27

   yes they would need machining out and yes it does weaken it but it really depends on how much bigger you go over size wise, the bigger you go the more you weaken it as the inner walls get closer together
3. user_10176 Saxperience Post Whore Joined: Jun 2006 Ramsey st marys, peterborough Posts: 8288 Saxo's, Corsa (Daily)

   #3 13th October 2010, 18:29

   dnt have sleeves, they standard bore size is 78.5mm, biggest size is 80mm pistons, all you got to get someone to re=bore the bores to the correct size,
4. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

   #4 13th October 2010, 18:50

   I'm pretty sure someone in Europe has fitted 81mm pistons, although there would be VERY little material left in-between the bores !!
   
   Not sure about the reliability of the engine, plus I think he was NA
5. wicked-vtr Saxperience Forum Bum Joined: Jan 2009 Surrey Posts: 2608 200sx s14a mark 1 vts

   #5 13th October 2010, 18:51

   In that case, il probably need to have the block rebored if I fit new pistons anyway. Would it be worth going a bit bigger (79mm ish) or will it weaken the block too much to run a decent amount of boost safely?
6. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

   #6 13th October 2010, 19:02

   Quote:

   Originally Posted by wicked-vtr In that case, il probably need to have the block rebored if I fit new pistons anyway. Would it be worth going a bit bigger (79mm ish) or will it weaken the block too much to run a decent amount of boost safely?

   You'll need to get a good quality machinist to hone your block even if fitting standard size new pistons and rings.
   
   The quality of the honing is VERY important.
   
   How longs a piece of string about max piston size with boost, I personally wouldn't like to run past 79mm pistons with boost, but that's just me - I've not tried different pistons sizes and boost levels and seen which setup is the most reliable so can't give you a set answer.
   
   You going for forged pistons i'm guessing?
7. user_15989 Saxperience Forum Bum Joined: May 2007 Posts: 4857

   #7 13th October 2010, 19:26

   Are you after a few extra CC to help spin a turbo up?
8. wicked-vtr Saxperience Forum Bum Joined: Jan 2009 Surrey Posts: 2608 200sx s14a mark 1 vts

   #8 13th October 2010, 19:27

   Yeah I will be running forged pistons and rods ross. If its going to be done, may as well do it right. Any suggestions where to get the work done?
9. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

   #9 13th October 2010, 19:36

   I've only used a local place to me in Bournemouth for head skimming, not got any honing done.
   
   Could give GMC a try, as they sell the rods and pistons, and will have a local machine shop that they get all their work done? or Atspeed?
   
   Or pm sandy309 on here as he is a very well respected engine builder, so if you're doing it right he might be worth a try?
10. wicked-vtr Saxperience Forum Bum Joined: Jan 2009 Surrey Posts: 2608 200sx s14a mark 1 vts

    #10 13th October 2010, 19:47

    Quote:

    Originally Posted by raunchz I've only used a local place to me in Bournemouth for head skimming, not got any honing done. Could give GMC a try, as they sell the rods and pistons, and will have a local machine shop that they get all their work done? or Atspeed? Or pm sandy309 on here as he is a very well respected engine builder, so if you're doing it right he might be worth a try?

    Ok cheers for the help mate
    Il throw a few pm's around
11. wicked-vtr Saxperience Forum Bum Joined: Jan 2009 Surrey Posts: 2608 200sx s14a mark 1 vts

    #11 13th October 2010, 19:53

    Quote:

    Originally Posted by AXracing Are you after a few extra CC to help spin a turbo up?

    That would be nice, the turbo ive Got here should be ok, but every little helps. Plus the larger pistons should give me a power/torque increase over standard size ones.
12. axsaxoman Saxperience Forum Bum Joined: Jan 2003 Scotland Posts: 3380

    #12 14th October 2010, 16:39

    79mm is best compromise
    most people can,t be bothered having the block bored so fit std size new pistons to worn bores --and end up with a bit oil consumption .
    if you looking for a set of 79mm wo0sner pistons
    for a good price on some brand new ones
    send a PM to paulsupervts84 on the ssc forum
    I also have a set of same pistons 79mm turbo type ,which are perfect and have run for a very short time in my s/c car -- £250
    removed only becauseI was doing a specific test on my own car
13. unreal106 Established Member Joined: Apr 2008 Dudley Posts: 1634 106 GTI

    #13 14th October 2010, 17:12

    john i would be very interested in these
    
    money waiting!
14. paulsupervts84 Frequent Poster Joined: Nov 2008 Posts: 666

    #14 15th October 2010, 09:20

    I have got a brand new set of 78.9mm wossner low comp pistons if anyone is intersted i have put them on ebay as i have very little interst the link ishttp://cgi.ebay.co.uk/ws/eBayISAPI.d...STRK:MESELX:IT
15. wicked-vtr Saxperience Forum Bum Joined: Jan 2009 Surrey Posts: 2608 200sx s14a mark 1 vts

    #15 15th October 2010, 13:49

    I saw them mate, your set is what Got me thinking about fitting larger ones tbh. I didn't pm you about them as im still getting quotes to have the block bored out
16. unreal106 Established Member Joined: Apr 2008 Dudley Posts: 1634 106 GTI

    #16 15th October 2010, 14:13

    gmc i will 1000000% take them
17. paulsupervts84 Frequent Poster Joined: Nov 2008 Posts: 666

    #17 15th October 2010, 15:28

    Quote:

    Originally Posted by wicked-vtr I saw them mate, your set is what Got me thinking about fitting larger ones tbh. I didn't pm you about them as im still getting quotes to have the block bored out

    near me it £70 for a rebore
18. paulsupervts84 Frequent Poster Joined: Nov 2008 Posts: 666

    #18 16th October 2010, 00:39

    if anyone is intersted in the pistons you got 16 hours left to get you bids in
19. lharrowing Frequent Poster Joined: Nov 2008 norwich Posts: 941 Citroen Saxo Westcoast MK1

    #19 16th October 2010, 09:32

    thought these engine use wet liners or is it the smaller size 1..4 downwards etc...?
20. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #20 16th October 2010, 11:51

    Quote:

    Originally Posted by lharrowing thought these engine use wet liners or is it the smaller size 1..4 downwards etc...?

    16v doesn't use liners
    
    I know the newer 1.4 uses wetliners
21. paulsupervts84 Frequent Poster Joined: Nov 2008 Posts: 666

    #21 19th October 2010, 14:17

    the new link to my pistons on ebay is http://cgi.ebay.co.uk/ws/eBayISAPI.d...STRK:MESELX:IT they end today
22. paulsupervts84 Frequent Poster Joined: Nov 2008 Posts: 666

    #22 19th October 2010, 19:23

    hour left