Bored out cylinders

1. user_33810 L-plater Joined: May 2009 Kent (SE of London) Posts: 92 Arctic Steel mk2 VTR

   #1 30th April 2010, 00:27

   Anyone had their cylinders bored out, if so what have they noticed?
   
   I was considering it along with a million other things, thought I would rather get some second hand pros and cons
2. frankie Saxperience Addict Joined: Apr 2006 Frome, down deepest, darkest zummerset Posts: 12971 VTRallye

   #2 30th April 2010, 00:29

   There is not enough material on the TU to have the boared out...
   
   only enough for oversized pistons.
3. LSOfreak Saxperience Addict Joined: Jan 2008 west london Posts: 13810

   #3 30th April 2010, 00:49

   best of with aftermarket crank and pistonheads. ie the stroker kit
4. deans2k8 Established Member Joined: Sep 2008 gainsborough Posts: 2337 Vectra 2.0t

   #4 30th April 2010, 01:13

   i heard theres pretty much no point of having the stroker kit if your not going to turbo it
5. LSOfreak Saxperience Addict Joined: Jan 2008 west london Posts: 13810

   #5 30th April 2010, 01:17

   no idea lol i just assumed a 1800cc would be quicker than 1600cc
   
   wouldnt of thought a turbo was a must have could be wrong
6. TU-Tuning Saxperience Hardcore! Joined: May 2006 Bristol Posts: 16575 JP4urio, 306 DTurbo SportShed

   #6 30th April 2010, 01:25

   Due to the higher stroke (and higher weight of internal moving parts) the engine will rev less freely than when a 1600. So to get the best out of it, the best option is boost which fills up the newly created space as best as possible.
   
   NA engines rely on their ability to rev freely so isnt necessarily the best way to go. Youll get more power but loose part of the character of the engine, which in a lot of ways makes it pointless and it would have made more sense to fit an engine which was designed to be a 1.8 or 2.0 from the offset. There are some very nice Japaneese and Rover K series offerings out there.
   
   The walls as said are very thin and not designed with any potential for being bored out, theyre 78.5mm as standard and youve got about 81mm to play with, so the maximum is about 80mm.

   3 users thanked this post: frankie, user_10176, user_43178
7. LSOfreak Saxperience Addict Joined: Jan 2008 west london Posts: 13810

   #7 30th April 2010, 01:32

   learn something new everyday
8. user_10176 Saxperience Post Whore Joined: Jun 2006 Ramsey st marys, peterborough Posts: 8288 Saxo's, Corsa (Daily)

   #8 30th April 2010, 14:07

   Quote:

   Originally Posted by TU-Tuning Due to the higher stroke (and higher weight of internal moving parts) the engine will rev less freely than when a 1600. So to get the best out of it, the best option is boost which fills up the newly created space as best as possible. NA engines rely on their ability to rev freely so isnt necessarily the best way to go. Youll get more power but loose part of the character of the engine, which in a lot of ways makes it pointless and it would have made more sense to fit an engine which was designed to be a 1.8 or 2.0 from the offset. There are some very nice Japaneese and Rover K series offerings out there. The walls as said are very thin and not designed with any potential for being bored out, theyre 78.5mm as standard and youve got about 81mm to play with, so the maximum is about 80mm.

   
   very good statment there dude,
   
   yer 80mm pistons would be the biggest size that a TU block could take! without getting too close to the oil walls.
9. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #9 30th April 2010, 14:15

   i still wouldnt want to take it that close, just wouldnt be as reliable as it should bee
10. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #10 30th April 2010, 14:17

    80mm pistons in NA for would be fine - people seem to be running them with no problems.
    
    For boost though I'd be nervous as it'd leave very little material between the cylinders due to the heat.
11. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #11 30th April 2010, 14:22

    i say if your taking that much off then adding more power your just asking for trouble... just my opinion really, stock engine copes fine with its current design, adding more power proves to de-crease reliability, if your get more power you get more heat inevitabley...so to make your cylinderwalls thinner just seems ludocris to me, and yeh ross defo wouldnt go that route with boost lol, block would explode alover your car and leave you fred flintstone'd ahaha