New cams to x40 2.0t/T4 (1997-1999)

[GerBeGurGya]

vulvas40t4 wrote on Wed, 29 November 2006 23:44

GerBeGurGya wrote on Thu, 30 November 2006 04:23 On the OEM clearance this has been calculated and with a change of the cams which pushes the valves deeper the clearance could be close to the safe limit.Stronger springs are the answer in this case. These cams are not that "aggressive".

I know just sayn'.

Still already different timing in advance ,longer open time meaning the piston is closing up fast on the valve which is now open sooner/still open plus the 1mm deeper opening might be an issue.Not arguing or anything but when the cams getting changed the springs should be changed as well.These two comes together.Unfortunately we can not see inside the engine and no one really knows how much of an adjustment can be done on the cams without getting some serious damage.

The clearance can be checked but it requires some extra work from a pioneer kinda person (like you may be) by taking out at one cylinder the springs from one in and one ex valve.Now when the cams on the deepest and the piston on the highest you can push and pull that valve without the spring freely to see how much clearance it still has.

It is a hate job but hey nothing is free.

[vulvas40t41568908561]

GerBeGurGya wrote on Thu, 30 November 2006 07:22

vulvas40t4 wrote on Wed, 29 November 2006 23:44 GerBeGurGya wrote on Thu, 30 November 2006 04:23 On the OEM clearance this has been calculated and with a change of the cams which pushes the valves deeper the clearance could be close to the safe limit.Stronger springs are the answer in this case. These cams are not that "aggressive". I know just sayn'. Still already different timing in advance ,longer open time meaning the piston is closing up fast on the valve which is now open sooner/still open plus the 1mm deeper opening might be an issue.Not arguing or anything but when the cams getting changed the springs should be changed as well.These two comes together.Unfortunately we can not see inside the engine and no one really knows how much of an adjustment can be done on the cams without getting some serious damage. The clearance can be checked but it requires some extra work from a pioneer kinda person (like you may be) by taking out at one cylinder the springs from one in and one ex valve.Now when the cams on the deepest and the piston on the highest you can push and pull that valve without the spring freely to see how much clearance it still has. It is a hate job but hey nothing is free.

One "friend" has already tested those and driven 10000km with 0 setting on intake and 7.5 on exhaust (dont remember was it advanced or retarded) without any problems. He did not measure the distance but you are right that is the way to do.

He had the same cams as i do on same engine.

[pyaap]

Does anyone know what the lift and duration is for Phase 2 T4 cars, i.e. B4204T5 engines, and where can I get stronger valve springs (I thought the stock ones were double springs)?

Finally for the Phase 1 cars, does anyone know the specs for lift and duration for modifying standard T4 cams from standard specs? Thanks!

[tcode1568908558]

GerBeGurGya wrote on Wed, 29 November 2006 21:23

Those marks are from your valves right?.Don't forget that on high RPM-s if the exhaust can not flow really well the back pressure might gonna work against the valves making the valves closing up late or not letting it close at all.At this point the valves are controlled by the gases only.To prevent a catastrophic event like that the use of stronger spring are definitely a must to maintain proper closing.On the OEM clearance this has been calculated and with a change of the cams which pushes the valves deeper the clearance could be close to the safe limit.Stronger springs are the answer in this case.

The marks are from my ex valves which are now bented because booth of belts (timing and auxilary) were destroyed (http://s40concepts.net/forum/index.php?t=msg&th=9045&amp ;amp ;rid=563&S=142d7d3f79c9f36158f93f80e78fc6d0&pl_view= &start=0#msg_100966). Back pressure won't be an issue with full 3" exhaust and #7 exhaust opening on 16t turbo I belive. Also, if you put stronger springs you will definitely put much more stress on camshafts and bearings which obviusly isn't good. As Vulvas40T4 already said, those cams are not that aggresive, so stock springs will be fine.

[GerBeGurGya]

tcode wrote on Fri, 01 December 2006 07:07

GerBeGurGya wrote on Wed, 29 November 2006 21:23 Those marks are from your valves right?.Don't forget that on high RPM-s if the exhaust can not flow really well the back pressure might gonna work against the valves making the valves closing up late or not letting it close at all.At this point the valves are controlled by the gases only.To prevent a catastrophic event like that the use of stronger spring are definitely a must to maintain proper closing.On the OEM clearance this has been calculated and with a change of the cams which pushes the valves deeper the clearance could be close to the safe limit.Stronger springs are the answer in this case. The marks are from my ex valves which are now bented because booth of belts (timing and auxilary) were destroyed (http://s40concepts.net/forum/index.php?t=msg&th=9045&amp ;amp ;amp ;rid=563&S=142d7d3f79c9f36158f93f80e78fc6d0&pl_view= &start=0#msg_100966). Back pressure won't be an issue with full 3" exhaust and #7 exhaust opening on 16t turbo I belive. Also, if you put stronger springs you will definitely put much more stress on camshafts and bearings which obviusly isn't good. As Vulvas40T4 already said, those cams are not that aggresive, so stock springs will be fine.

I don't mind whatever is the case.I never did bend a valve so far tho not even accidentally.You might have the exhaust done but most hasn't.I just wanted to point that out that no one messes up their engine following blindly as this upgrade is hardly a plug and play for novices.

[vulvas40t41568908561]

100-200km/h (60-125MPH) 3. and 4. gear 1.1bar (16psi) boost.

[GerBeGurGya]

<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText"><b>vulvas40t4 wrote on Sun, 03 December 2006 14:40</b></td></tr><tr><td class="quote">

100-200km/h (60-125MPH) 3. and 4. gear 1.1bar (16psi) boost. <img src="images/smiley_icons/icon_smile.gif" border=0 alt="Smile">

I'm sorry mate I don't grasping the concept here.What are you saying? <img src="images/smiley_icons/icon_smile.gif" border=0 alt="Smile">

[vulvas40t41568908561]

GerBeGurGya wrote on Mon, 04 December 2006 01:13

vulvas40t4 wrote on Sun, 03 December 2006 14:40 100-200km/h (60-125MPH) 3. and 4. gear 1.1bar (16psi) boost. http://i119.photobucket.com/albums/o143/VulvaS40T4/Kuvia/100 -200.jpg I'm sorry mate I don't grasping the concept here.What are you saying?

Nothing special.

http://www.x40nordic.com/cars_fast.aspx

[GerBeGurGya]

vulvas40t4 wrote on Mon, 04 December 2006 00:41

GerBeGurGya wrote on Mon, 04 December 2006 01:13 vulvas40t4 wrote on Sun, 03 December 2006 14:40 100-200km/h (60-125MPH) 3. and 4. gear 1.1bar (16psi) boost. http://i119.photobucket.com/albums/o143/VulvaS40T4/Kuvia/100 -200.jpg I'm sorry mate I don't grasping the concept here.What are you saying? Nothing special. http://www.x40nordic.com/cars_fast.aspx

Still have to ask.....What are you sayin'??

[vulvas40t41568908561]

GerBeGurGya wrote on Mon, 04 December 2006 08:47

vulvas40t4 wrote on Mon, 04 December 2006 00:41 GerBeGurGya wrote on Mon, 04 December 2006 01:13 vulvas40t4 wrote on Sun, 03 December 2006 14:40 100-200km/h (60-125MPH) 3. and 4. gear 1.1bar (16psi) boost. http://i119.photobucket.com/albums/o143/VulvaS40T4/Kuvia/100 -200.jpg I'm sorry mate I don't grasping the concept here.What are you saying? Nothing special. http://www.x40nordic.com/cars_fast.aspx Still have to ask.....What are you sayin'??

That car goes fast with low boost. Before (original cams) i had to use 0.2-0.3bar more boost to go as fast.

[tcode1568908558]

My 2.0 N/A cams will be installed (finally) tomorrow, so will see how they perform with overboosted 14t . For those who interested, part numbers of cams are: 9135682 - intake and 9135683 - exhaust.

[vulvas40t41568908561]

tcode wrote on Mon, 04 December 2006 14:04

My 2.0 N/A cams will be installed (finally) tomorrow, so will see how they perform with overboosted 14t . For those who interested, part numbers of cams are: 9135682 - intake and 9135683 - exhaust.

I think you like those.

Just a wild quess.

[tcode1568908558]

vulvas40t4 wrote on Mon, 04 December 2006 07:24

tcode wrote on Mon, 04 December 2006 14:04 My 2.0 N/A cams will be installed (finally) tomorrow, so will see how they perform with overboosted 14t . For those who interested, part numbers of cams are: 9135682 - intake and 9135683 - exhaust. I think you like those. Just a wild quess.

Will see, will see

Did you lowered boost or it drops with N/A cams?

[vulvas40t41568908561]

tcode wrote on Mon, 04 December 2006 14:36

vulvas40t4 wrote on Mon, 04 December 2006 07:24 tcode wrote on Mon, 04 December 2006 14:04 My 2.0 N/A cams will be installed (finally) tomorrow, so will see how they perform with overboosted 14t . For those who interested, part numbers of cams are: 9135682 - intake and 9135683 - exhaust. I think you like those. Just a wild quess. Will see, will see Did you lowered boost or it drops with N/A cams?

Lowered as low as i could (0.8bar) to make sure not to destroy anything.

Now i have tested with 1.3bar and works still like dream.

[tcode1568908558]

vulvas40t4 wrote on Mon, 04 December 2006 07:38

tcode wrote on Mon, 04 December 2006 14:36 vulvas40t4 wrote on Mon, 04 December 2006 07:24 tcode wrote on Mon, 04 December 2006 14:04 My 2.0 N/A cams will be installed (finally) tomorrow, so will see how they perform with overboosted 14t . For those who interested, part numbers of cams are: 9135682 - intake and 9135683 - exhaust. I think you like those. Just a wild quess. Will see, will see Did you lowered boost or it drops with N/A cams? Lowered as low as i could (0.8bar) to make sure not to destroy anything. Now i have tested with 1.3bar and works still like dream.

I spoke with my tuner, he said that no problem should be with new cams, ECU will adjust everything through MAF and all other sensors. Glad to hear from you that everything works fine.