# my compression, for boost? **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [December 16, 2008, 4:11pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849 "2008-12-16T16:11:40Z")\ **Posts on this page:** 18\ **Page:** 2
**Author:** ![Inn-Tune](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/inn-tune/32/7588_2.png) [@Inn-Tune](https://forums.speedlife.net/u/Inn-Tune)\ **Post date:** [December 17, 2008, 11:27am UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/21 "2008-12-17T11:27:16Z")
The more you bore it the weaker the stock sleeves are. The guys pushing good amounts of power on stock sleeves generally aren’t punching them out much. When you go to a ductile iron sleeve you can punch it out more and retain good structural integrity and resistance to distortion in the sleeve because of the different properties of the material. ---
**Author:** ![deebo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/deebo/32/5218_2.png) [@deebo](https://forums.speedlife.net/u/deebo)\ **Post date:** [December 17, 2008, 2:09pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/22 "2008-12-17T14:09:38Z")
> [@BREETIME](#): > > how many times have we gone over this you moron? we havent actually gone over THIS asshole! or calculated it with headgasket thickness, rodlength, or anything else than “this piston is too high, and this is too low” > [@Inn-Tune](#): > > The more you bore it the weaker the stock sleeves are. The guys pushing good amounts of power on stock sleeves generally aren’t punching them out much. When you go to a ductile iron sleeve you can punch it out more and retain good structural integrity and resistance to distortion in the sleeve because of the different properties of the material. Yeah i realized its pretty dumb and unsafe to bore the stock sleeves much higher than if i were to go to a 81.5 piston, ill prob just go with stock piston size w/ stock sleeves and i should be good ---
**Author:** ![BREETIME](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/breetime/32/5214_2.png) [@BREETIME](https://forums.speedlife.net/u/BREETIME)\ **Post date:** [December 17, 2008, 2:25pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/23 "2008-12-17T14:25:54Z")
> [@deebo](#): > > **we havent actually gone over THIS asshole!** > **or calculated it with headgasket thickness, rodlength, or anything else than “this piston is too high, and this is too low”** > > Yeah i realized its pretty dumb and unsafe to bore the stock sleeves much higher than if i were to go to a 81.5 piston, ill prob just go with stock piston size w/ stock sleeves and i should be good you going to make 300 wheel…the fuck are you talking about… ---
**Author:** ![deebo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/deebo/32/5218_2.png) [@deebo](https://forums.speedlife.net/u/deebo)\ **Post date:** [December 17, 2008, 2:32pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/24 "2008-12-17T14:32:27Z")
:picard: i wouldnt care what my compression was if i was making 300wheel ---
**Author:** ![Saxon](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@Saxon](https://forums.speedlife.net/u/Saxon)\ **Post date:** [December 17, 2008, 2:40pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/25 "2008-12-17T14:40:17Z")
if you have the money sleeve it and go with 83/84mm bore i dont regret one bit having a sleeved 84mm block (9:1 compression), naturally aspirated i put down almost 180whp 135 tq (have friend who put down 181/127 on a modified 81mm jdm itr) if you want to keep stock sleeves go with 81.5mm bore and cp pistons with 9:1 or 10:1 compression pistons (difference is negligable except throttle response) for 400whp either will work but the sleeved block will give you room to grow and piece of mind (as well as tq) ---
**Author:** ![deebo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/deebo/32/5218_2.png) [@deebo](https://forums.speedlife.net/u/deebo)\ **Post date:** [December 17, 2008, 2:47pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/26 "2008-12-17T14:47:13Z")
> [@alpha earl](#): > > if you have the money sleeve it and go with 83/84mm bore > > i dont regret one bit having a sleeved 84mm block (9:1 compression), naturally aspirated i put down almost 180whp 135 tq (have friend who put down 181/127 on a modified 81mm jdm itr) > > if you want to keep stock sleeves go with 81.5mm bore and cp pistons with 9:1 or 10:1 compression pistons (difference is negligable except throttle response) > > for 400whp either will work but the sleeved block will give you room to grow and piece of mind (as well as tq) Yeah me getting sleeves will be whether or not i have enough money, kinda bad thing, i wish that wasnt the reason ☹ ---
**Author:** ![Saxon](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@Saxon](https://forums.speedlife.net/u/Saxon)\ **Post date:** [December 17, 2008, 3:16pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/27 "2008-12-17T15:16:13Z")
> [@deebo](#): > > Yeah me getting sleeves will be whether or not i have enough money, kinda bad thing, i wish that wasnt the reason ☹ thats usually the reason most people will get sleaves or not lol ---
**Author:** ![Toda\_Party](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/toda_party/32/7354_2.png) [@Toda\_Party](https://forums.speedlife.net/u/Toda_Party)\ **Post date:** [December 17, 2008, 4:26pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/28 "2008-12-17T16:26:04Z")
81.5mm is FINE sleeves can always come later. 400 whp is plenty. Shit even 300-350 is fine for most ppl who haven’t driven anything faster than like a 16 sec car ya know what u gotta do is, throw in the 81.5mm pistons, then scour honda-tech and whatever other boards for a good deal on a near-local sleeved block (lots of ppl running out of cash or having “mistake” babies and shit :lol:) then sell your piston/rod block to some noob ---
**Author:** ![BREETIME](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/breetime/32/5214_2.png) [@BREETIME](https://forums.speedlife.net/u/BREETIME)\ **Post date:** [December 17, 2008, 4:29pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/29 "2008-12-17T16:29:19Z")
> [@Toda Party](#): > > 81.5mm is FINE > > sleeves can always come later. **400 whp is plenty. Shit even 300-350 is fine for most ppl who haven’t driven anything faster than like a 16 sec car ya know** > > what u gotta do is, throw in the 81.5mm pistons, then scour honda-tech and whatever other boards for a good deal on a near-local sleeved block (lots of ppl running out of cash or having “mistake” babies and shit :lol:) then sell your piston/rod block to some noob we will see deebo on the news… ---
**Author:** ![Toda\_Party](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/toda_party/32/7354_2.png) [@Toda\_Party](https://forums.speedlife.net/u/Toda_Party)\ **Post date:** [December 17, 2008, 4:35pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/30 "2008-12-17T16:35:49Z")
nice to say. when in boost, 2 hands on the wheel ---
**Author:** ![deebo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/deebo/32/5218_2.png) [@deebo](https://forums.speedlife.net/u/deebo)\ **Post date:** [December 17, 2008, 4:45pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/31 "2008-12-17T16:45:35Z")
d00d! i’ve driven mad fast Lt1’s! but yeah, im not gonna go wot pulling out of my driveway and doing pulls when i get the car lol, taking it slow. i dont really recall but i think i drive with 2 hands anyways if im doing a “pull” in my super fast ls integra now lol. Do u think i should just get 81.5 pistons then? I’m gonna be ordering everthing after whenever my tranny gets here 😉 ---
**Author:** ![Saxon](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@Saxon](https://forums.speedlife.net/u/Saxon)\ **Post date:** [December 17, 2008, 4:49pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/32 "2008-12-17T16:49:17Z")
i dont think i will ever have a regular 1.8L anymore, there is no replacement for displacement, especially when you start with small motors like we all do ---
**Author:** ![deebo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/deebo/32/5218_2.png) [@deebo](https://forums.speedlife.net/u/deebo)\ **Post date:** [December 17, 2008, 4:50pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/33 "2008-12-17T16:50:10Z")
i think with all pistons anyways the walls will have to be bored nothings exact to oem spec ---
**Author:** ![Inn-Tune](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/inn-tune/32/7588_2.png) [@Inn-Tune](https://forums.speedlife.net/u/Inn-Tune)\ **Post date:** [December 17, 2008, 5:02pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/34 "2008-12-17T17:02:16Z")
No matter what you don’t want stock bore pistons on a used block. You need to overbore some so you can machine the block to match the pistons. This will also improve on the factory out of round specs and bore taper, and you get to hone the bores to better than OEM quality if you’re using the right shop. 😉 You really should be having your block torn down and inspected before ordering pistons to see what size you need to bore to if you want to do this the right way. If you haven’t owned the engine since new it may have been bored once already so you may get pistons you can’t use if you buy pistons before measuring. ---
**Author:** ![Toda\_Party](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/toda_party/32/7354_2.png) [@Toda\_Party](https://forums.speedlife.net/u/Toda_Party)\ **Post date:** [December 17, 2008, 5:13pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/35 "2008-12-17T17:13:30Z")
psh its a fuckin honda, the cylinders don’t go out of round…they just crack! ---
**Author:** ![BREETIME](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/breetime/32/5214_2.png) [@BREETIME](https://forums.speedlife.net/u/BREETIME)\ **Post date:** [December 17, 2008, 5:18pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/36 "2008-12-17T17:18:56Z")
> [@Toda Party](#): > > psh its a fuckin honda, the cylinders don’t go out of round…they just crack! ha ---
**Author:** ![Saxon](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@Saxon](https://forums.speedlife.net/u/Saxon)\ **Post date:** [December 17, 2008, 5:33pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/37 "2008-12-17T17:33:07Z")
> [@Inn-Tune](#): > > No matter what you don’t want stock bore pistons on a used block. You need to overbore some so you can machine the block to match the pistons. This will also improve on the factory out of round specs and bore taper, and you get to hone the bores to better than OEM quality if you’re using the right shop. 😉 > > You really should be having your block torn down and inspected before ordering pistons to see what size you need to bore to if you want to do this the right way. If you haven’t owned the engine since new it may have been bored once already so you may get pistons you can’t use if you buy pistons before measuring. sound advice ---
**Author:** ![deebo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/deebo/32/5218_2.png) [@deebo](https://forums.speedlife.net/u/deebo)\ **Post date:** [December 17, 2008, 5:37pm UTC](https://forums.speedlife.net/t/my-compression-for-boost/59849/38 "2008-12-17T17:37:09Z")
> [@Inn-Tune](#): > > No matter what you don’t want stock bore pistons on a used block. You need to overbore some so you can machine the block to match the pistons. This will also improve on the factory out of round specs and bore taper, and you get to hone the bores to better than OEM quality if you’re using the right shop. 😉 > > You really should be having your block torn down and inspected before ordering pistons to see what size you need to bore to if you want to do this the right way. If you haven’t owned the engine since new it may have been bored once already so you may get pistons you can’t use if you buy pistons before measuring. i believe its stock bore, because theres p72’s in there, but yeah ill prob end up doing this… somewhere 😉 [Previous page](https://forums.speedlife.net/t/my-compression-for-boost/59849.md?page=1)