# downsides to boring a motor out to max safe numbers **URL:** \ **Category:** PittSpeed Off Topic\ **Created:** [December 31, 2004, 12:19pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402 "2004-12-31T12:19:54Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [December 31, 2004, 12:19pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/1 "2004-12-31T12:19:54Z")
i’ve been kicking the .040 vs .060 oversized pistons for a while now, the only downside i see is if something happens i’d need a new block…but blocks are cheap these days so is there any other reason to not just go .060 from the start? ---
**Author:** ![Converted2LSX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/converted2lsx/32/5962_2.png) [@Converted2LSX](https://forums.speedlife.net/u/Converted2LSX)\ **Post date:** [December 31, 2004, 1:09pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/2 "2004-12-31T13:09:41Z")
if a few CCs more displacement means that much to you go for it ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [December 31, 2004, 1:19pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/3 "2004-12-31T13:19:40Z")
just tryin to do it right the first time it’s all the same price…and a few cc’s more displacement helps spool larger turbos ---
**Author:** ![brokeasskorean](https://avatars.discourse-cdn.com/v4/letter/b/e19b73/32.png) [@brokeasskorean](https://forums.speedlife.net/u/brokeasskorean)\ **Post date:** [December 31, 2004, 1:24pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/4 "2004-12-31T13:24:57Z")
are you doing that with just the 2.0 block? if your worried about more displacment, just do the stroker or just do the 4G64 bottom end. ---
**Author:** ![Converted2LSX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/converted2lsx/32/5962_2.png) [@Converted2LSX](https://forums.speedlife.net/u/Converted2LSX)\ **Post date:** [December 31, 2004, 1:32pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/5 "2004-12-31T13:32:35Z")
then he wouldnt be able to rev to 9579873467398457630467 rpms, silly rabbit those rpms are for hondas 🙂 ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [December 31, 2004, 1:43pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/6 "2004-12-31T13:43:55Z")
> [@brokeasskorean](#): > > are you doing that with just the 2.0 block? if your worried about more displacment, just do the stroker or just do the 4G64 bottom end. not worried about anything the prices are the same between sizes just wondering why you wouldnt go the biggest you can ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [December 31, 2004, 1:56pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/7 "2004-12-31T13:56:16Z")
I would rather have a margin of safety that way you can always bore more if need be and don’t have to worry about finding a block ---
**Author:** ![Quik](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/quik/32/5979_2.png) [@Quik](https://forums.speedlife.net/u/Quik)\ **Post date:** [December 31, 2004, 1:57pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/8 "2004-12-31T13:57:22Z")
kurt when you over bored a motor you tend to have more heat issues. ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [December 31, 2004, 1:58pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/9 "2004-12-31T13:58:57Z")
> [@BoostedITR41](#): > > I would rather have a margin of safety that way you can always bore more if need be and don’t have to worry about finding a block if something happens that i need to rebore more than likely i’ll need a new block anyway not worried bout that. goerge dsm blocks are 2x as thick as a standard block they dissapate heat really well through the cooling passages ---
**Author:** ![Stroker](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/stroker/32/5948_2.png) [@Stroker](https://forums.speedlife.net/u/Stroker)\ **Post date:** [December 31, 2004, 2:20pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/10 "2004-12-31T14:20:14Z")
mine is 20over no heat issues runs coola s hell when it runs that is ---
**Author:** ![imported\_gearhead](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_gearhead/32/5957_2.png) [@imported\_gearhead](https://forums.speedlife.net/u/imported_gearhead)\ **Post date:** [January 4, 2005, 6:59pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/11 "2005-01-04T18:59:31Z")
Honestly, your not going to see a big difference. I’ve bored and stroked plenty of motors and you’d be better off staying at .040" over so not to thin the cylinders. Does the block need bored? ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [January 4, 2005, 7:33pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/12 "2005-01-04T19:33:52Z")
stated before boring a dsm block to .060 does not come close to thinning the cylinders ---
**Author:** ![Dominator](https://avatars.discourse-cdn.com/v4/letter/d/a4c791/32.png) [@Dominator](https://forums.speedlife.net/u/Dominator)\ **Post date:** [January 4, 2005, 8:58pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/13 "2005-01-04T20:58:33Z")
If there is no concern about thinning the cylinders or reusing the block, then what would be the benefit of going 40? ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [January 4, 2005, 9:27pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/14 "2005-01-04T21:27:35Z")
i’m planning .060 just making sure i dind’t miss anything that’s all. ---
**Author:** ![imported\_gearhead](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_gearhead/32/5957_2.png) [@imported\_gearhead](https://forums.speedlife.net/u/imported_gearhead)\ **Post date:** [January 5, 2005, 7:39am UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/15 "2005-01-05T07:39:25Z")
are you going to o-ring? I can’t picture how close the cyl. are on a 4g63, but if you over-bore, o-ringing will be not possible. ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [January 5, 2005, 7:56am UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/16 "2005-01-05T07:56:34Z")
i’ve seen .060 dsm motors oringed ---
**Author:** ![fshowcars](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fshowcars/32/5937_2.png) [@fshowcars](https://forums.speedlife.net/u/fshowcars)\ **Post date:** [January 5, 2005, 9:04am UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/17 "2005-01-05T09:04:43Z")
then it sounds like you have all the answers? thin walls - you say no problem need new block if issue - you said you’d buy one anyway .60 can’t oring - you say you can. ---
**Author:** ![Quik](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/quik/32/5979_2.png) [@Quik](https://forums.speedlife.net/u/Quik)\ **Post date:** [January 5, 2005, 9:05am UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/18 "2005-01-05T09:05:43Z")
Heat Issues ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [January 5, 2005, 10:08am UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/19 "2005-01-05T10:08:33Z")
we covered that too quik. ---
**Author:** ![neonmike22](https://avatars.discourse-cdn.com/v4/letter/n/ba8739/32.png) [@neonmike22](https://forums.speedlife.net/u/neonmike22)\ **Post date:** [January 5, 2005, 5:13pm UTC](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402/20 "2005-01-05T17:13:49Z")
Is there a headgasket to fit a .060 overbore? Overboring helps to unshroud the valves a bit, increases compression (i’m guessing it’d go up about .3 or so), and increases displacement. Not a whole heck of a lot of HP on a 4 cylinder by any means though, since you’re only picking up about 70cc or so going .060. If you’re going to junk the block if it ever needs rebuilt then there really isin’t a whole lot of reason not to go as big as possible. [Next page](https://forums.speedlife.net/t/downsides-to-boring-a-motor-out-to-max-safe-numbers/171402.md?page=2)