mk1 vts engine build cams etc

1. saxolee1986 Infrequent Poster Joined: Apr 2006 Matlock, Derbyshire United Kingdom (England) Posts: 109 Saxo VTR Mk 2 Saxo VTS Mk 1

   #1 30th December 2007, 10:05

   Hello
   
   Ive got a mk1 vts and a spare engine a few other bits and bobs! i am goin to attemp to build a deent spare engine and then drop it in my vts?
   
   ive got a ported and polished head and inlet, im in on the newmans phs 3's group buy, for a xsi box, supersprint mani, and a bmc enclosed induction kit and was wondering what else i could do for perfomance!
   
   was think of high comp pistons but i dont know alot about them?
   
   anyone recomend anything?
2. smearsvtr Established Member Joined: May 2007 My House in Burton on trent near derby Posts: 1025 Saxo 1.1 96 Saxo VTR 2000

   #2 30th December 2007, 10:16

   lightened and balanced bottom end? You will proberley loose abit of lowdown power but your car will rev up quicker
3. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #3 30th December 2007, 13:15

   Quote:

   Originally Posted by smearsvtr lightened and balanced bottom end? You will proberley loose abit of lowdown power but your car will rev up quicker

   where do you get that information from,
   
   L&B engines dont loose low down power if done correctly.
   
   and theres no point in doing it on a basically std engine anyway imo, its just extra £££ for the sake of it.
   
   high comp pistons and rods maybe, but i wouldnt worry about the crank.
4. gazza808 Frequent Poster Joined: Jul 2007 Posts: 591

   #4 30th December 2007, 13:16

   Quote:

   Originally Posted by smearsvtr lightened and balanced bottom end? You will proberley loose abit of lowdown power but your car will rev up quicker

   
   LMAO you wont make or loose any power,
   
   will just give the ability to rev it higher more safely
   
   
   could go high comp pistons if you are thinking about throttle bodies in the furture, if not forget them no reason to really.
5. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

   #5 30th December 2007, 21:45

   Quote:

   Originally Posted by Ryan where do you get that information from, L&B engines dont loose low down power if done correctly. and theres no point in doing it on a basically std engine anyway imo, its just extra £££ for the sake of it. high comp pistons and rods maybe, but i wouldnt worry about the crank.

   I disagree there mate.
   
   balenced crank will reduce vibration, allow free'er rev'ing, reduce the chances of damage due to vibration, and allow safeer higher rev's if the crank is ground with undersize bearings if the engine where to be modified.
   
   If you have spare money, do it, if doing it leaves you short for other mods, dont bother until you need 2
   
   Just my opinion
   
   Ross
   RCD Performance.
6. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #6 30th December 2007, 21:47

   the standard TU crank though is perfectly fine to use.
   its not one of the weak points on the engine and i know of alot of high spec engines that still use the std crank.
   
   remeber that tampering with the crank for no reason will cause weaknesses in this area.
7. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

   #7 30th December 2007, 22:22

   actually balenceing a crank prolongs its life. as less rotation forces are in effect which over time cause the metal to stress harden causeing weak points.
   
   but like you say, for moderate tuning its fine.
8. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #8 30th December 2007, 22:25

   Quote:

   Originally Posted by RCD-Performance actually balenceing a crank prolongs its life. as less rotation forces are in effect which over time cause the metal to stress harden causeing weak points. but like you say, for moderate tuning its fine.

   if its done incorrectly though its an area which can be weakened, alot of companies think that lightening and balancing means hacking off as much as possible, why a few L&B fly wheels tend to go bang when not done by the correct company.
   
   i just dont tend to feel its a worthwhile modification to do when its very very rare for a tu crank to fail.
9. williamsvts Saxperience Post Whore Joined: Feb 2006 northumberland Posts: 7693 pulsar gtir, mk4 astra sxi

   #9 30th December 2007, 23:08

   have you seen a flywheel explode? it aint a pretty sight
10. Joesnow Frequent Poster Joined: May 2006 Posts: 691 Mk 1 VTS poseidon blue

    #10 30th December 2007, 23:13

    Quote:

    Originally Posted by williamsvts have you seen a flywheel explode? it aint a pretty sight

    lol! has it happened to you??
11. williamsvts Saxperience Post Whore Joined: Feb 2006 northumberland Posts: 7693 pulsar gtir, mk4 astra sxi

    #11 30th December 2007, 23:24

    luckily not
12. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

    #12 30th December 2007, 23:28

    Quote:

    Originally Posted by Ryan if its done incorrectly though its an area which can be weakened, alot of companies think that lightening and balancing means hacking off as much as possible, why a few L&B fly wheels tend to go bang when not done by the correct company. i just dont tend to feel its a worthwhile modification to do when its very very rare for a tu crank to fail.

    I agree there are a lot of people around who would do that, i must add we are not one of those however if done PROPERLY, its a VERY good addition to an engine.
13. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

    #13 30th December 2007, 23:28

    Quote:

    Originally Posted by williamsvts have you seen a flywheel explode? it aint a pretty sight

    
    i too have never seen one desintegrate, however i've seen the damage it can do when done wrong. hense i will always do it right
14. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

    #14 30th December 2007, 23:30

    just not a cheap one to do properly.
    
    if i was going for a full race engine with very peaky power id do it, but if i was going that power id also have a proper gearbox.
    
    std bottom ends on TU engines seem pretty strong tbh for 90% of applications.
15. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

    #15 30th December 2007, 23:30

    Quote:

    Originally Posted by RCD-Performance i too have never seen one desintegrate, however i've seen the damage it can do when done wrong. hense i will always do it right

    cheap way to get a scooby vent though
16. Joesnow Frequent Poster Joined: May 2006 Posts: 691 Mk 1 VTS poseidon blue

    #16 30th December 2007, 23:35

    Some pics of what happens with a cowboy flywheel...
    
    
    
    
    
    
    
17. andywiddss1 Saxperience Post Whore Joined: Nov 2007 skipton northyorks Posts: 5275 clio 172 exclusive track toy

    #17 31st December 2007, 12:17

    oo la la not nice
18. AxForteVTS L-plater Joined: Dec 2007 Posts: 44

    #18 31st December 2007, 12:39

    Looking to get some 708's or similar spec cam, will i need to replace the followers/springs like it mentions on the GMC website? Or am i safe just to stick the new cams in...?
    
    Cheers guys,
    
    Dom
19. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #19 31st December 2007, 12:48

    I'd personally just change the followers.