Outline ·
[ Standard ] ·
Linear+
how an adjustable cam pulley works?
|
the_catacombs
|
 Jun 20 2008, 03:44 PM
|
|
QUOTE(alamdamai1 @ Jun 20 2008, 02:34 PM) thanks Bro for pointing out to us on this shortcoming cam pulley mod if one were to shift the engine powerband to lower rpm...i was about to purchase a Works Engineering Cam Pulley worth RM230 but upon giving further thougths, maybe it is not a good idea after all considering this knocking side effect...like they say - you can't have the cake and eat it also...better spent my money on the Boron Nitride thing...thanks Sifu...  boron nitride??...  adj campulley works best with highcams lar.... standard cams, got difference but not much... |
|
|
|
|
|
khguan
|
Oct 22 2008, 06:21 PM
|
New Member
|
Adjustable cam gear will not cause knocking problems if u set everything correctly.
I have tuned a wira 1.5A cam gear with 6 degree advance crank. Without any knocking problems.. and the car damn so powerful at low end pickup and still able to cruise at 170kmh without much probs with 1.6 internals.
The knocking problem is caused by the wrong ignition timing after u adjusted the cam timing. When u advance the crank (retard cam), the ignition timing at the distributor side also advanced.. that's y u get the knocking...
So pls dun blame the cam gear for the knocking problem... blame the tuner.
Added on October 22, 2008, 6:25 pmAs for adjustable cam gear with stock camshaft, it will still make some difference to the performance... just that u will experience a major compromise between pickup and high end power..
With performance camshaft, u can fine tune and maximise the powerband to suit ur driving style with proper cam timing.
This post has been edited by khguan: Oct 22 2008, 06:26 PM
|
|
|
|
|
|
the_catacombs
|
Oct 23 2008, 02:06 AM
|
|
|
QUOTE(khguan @ Oct 22 2008, 06:21 PM) Adjustable cam gear will not cause knocking problems if u set everything correctly. I have tuned a wira 1.5A cam gear with 6 degree advance crank. Without any knocking problems.. and the car damn so powerful at low end pickup and still able to cruise at 170kmh without much probs with 1.6 internals. The knocking problem is caused by the wrong ignition timing after u adjusted the cam timing. When u advance the crank (retard cam), the ignition timing at the distributor side also advanced.. that's y u get the knocking... So pls dun blame the cam gear for the knocking problem... blame the tuner.
Added on October 22, 2008, 6:25 pmAs for adjustable cam gear with stock camshaft, it will still make some difference to the performance... just that u will experience a major compromise between pickup and high end power.. With performance camshaft, u can fine tune and maximise the powerband to suit ur driving style with proper cam timing. my car cannot reach 170kmh....  |
|
|
|
|
|
drexchan
|
Oct 24 2008, 01:35 PM
|
Getting Started
|
As he said, tuner's problem.
Added on October 24, 2008, 2:01 pmQUOTE(alamdamai1 @ Jun 20 2008, 02:34 PM) thanks Bro for pointing out to us on this shortcoming cam pulley mod if one were to shift the engine powerband to lower rpm...i was about to purchase a Works Engineering Cam Pulley worth RM230 but upon giving further thougths, maybe it is not a good idea after all considering this knocking side effect...like they say - you can't have the cake and eat it also...better spent my money on the Boron Nitride thing...thanks Sifu... you better check back what Guan posted regarding to the knocking issue. This post has been edited by drexchan: Oct 24 2008, 02:01 PM |
|
|
|
|
|
khguan
|
Oct 25 2008, 08:08 PM
|
New Member
|
QUOTE(the_catacombs @ Oct 23 2008, 02:06 AM) my car cannot reach 170kmh.... try advancing ur cam for high end... then see how.. |
|
|
|
|
|
the_catacombs
|
Oct 26 2008, 02:10 AM
|
|
|
QUOTE(khguan @ Oct 25 2008, 08:08 PM) try advancing ur cam for high end... then see how.. problem is with my carburetor and clutch...  |
|
|
|
|
|
ANGELz
|
Nov 27 2008, 01:32 AM
|
Getting Started
|
will the car sound weird (exhaust) or idle weird if just set u advance too much? lets just say advance cam and advance ignition
cos my mech adjust the other day but it sounded weird now.. dun sound solid sounds like motor boat only my exhaust..
|
|
|
|
|
|
the_catacombs
|
Nov 27 2008, 07:47 AM
|
|
|
QUOTE(ANGELz @ Nov 27 2008, 01:32 AM) will the car sound weird (exhaust) or idle weird if just set u advance too much? lets just say advance cam and advance ignition cos my mech adjust the other day but it sounded weird now.. dun sound solid sounds like motor boat only my exhaust.. advance too much ur idling rpm goes high lor... but up to a certain point when knocking/pinging sound comes in... this is where it gets dangerous.. |
|
|
|
|
|
ANGELz
|
Nov 27 2008, 10:55 AM
|
Getting Started
|
QUOTE(the_catacombs @ Nov 27 2008, 07:47 AM) advance too much ur idling rpm goes high lor... but up to a certain point when knocking/pinging sound comes in... this is where it gets dangerous.. Oh okies thanks bro for the reply... My car idling high.. but mine is like that when i release the pedal off the accelerator.. the RPM stops at 2k rpm for a few seconds.. then down to 1.5krpm a few seconds.. then only back to 1k rpm idling.. |
|
|
|
|
|
the_catacombs
|
Nov 27 2008, 10:11 PM
|
|
|
QUOTE(ANGELz @ Nov 27 2008, 10:55 AM) Oh okies thanks bro for the reply... My car idling high.. but mine is like that when i release the pedal off the accelerator.. the RPM stops at 2k rpm for a few seconds.. then down to 1.5krpm a few seconds.. then only back to 1k rpm idling.. ur car fuel injection ah?? |
|
|
|
|
|
ANGELz
|
Nov 28 2008, 01:22 AM
|
Getting Started
|
yah bro.. fuel injection
|
|
|
|
|
|
Redliner3
|
Jul 16 2009, 01:09 PM
|
New Member
|
hi guys...
sori, bring up these old treat...
actually I would like to know, to gain hi-rev power/torque, izzit retard in,advance out correct?Campro engine....
and if wrongly setting, can it cause piston damage/crack or something internal damage?
|
|
|
|
|
|
evangelion
|
Jul 16 2009, 02:02 PM
|
|
|
QUOTE(khguan @ Oct 22 2008, 06:21 PM) Adjustable cam gear will not cause knocking problems if u set everything correctly. I have tuned a wira 1.5A cam gear with 6 degree advance crank. Without any knocking problems.. and the car damn so powerful at low end pickup and still able to cruise at 170kmh without much probs with 1.6 internals. The knocking problem is caused by the wrong ignition timing after u adjusted the cam timing. When u advance the crank (retard cam), the ignition timing at the distributor side also advanced.. that's y u get the knocking... So pls dun blame the cam gear for the knocking problem... blame the tuner.
Added on October 22, 2008, 6:25 pmAs for adjustable cam gear with stock camshaft, it will still make some difference to the performance... just that u will experience a major compromise between pickup and high end power.. With performance camshaft, u can fine tune and maximise the powerband to suit ur driving style with proper cam timing. Can we adjust the cam pulley to retard 6 degree (3mm)? No any problem and can gain pick up starting? My car (Proton 4G15 SVDO) already install Pipercam cam shaft. |
|
|
|
|
|
alamdamai1
|
Dec 3 2009, 09:02 AM
|
Getting Started
|
planning to do this mod very soon....but before that, need the help of Sifus here... i've noticed the cam timing for our 4G15 is different between a Carbie and EFI models..append below is the spec sheet... hence, can anyone confirm this and if so, would it be worthwhile to change my stock Carbie Cam to the EFI version for better engine efficiency as the exhaust valve timing for the EFI opens later compared to the Carbie model... members advise is highly appreciated...many thanks...   |
|
|
|
|
|
tictac
|
Mar 20 2011, 03:57 PM
|
Member
|
QUOTE(alamdamai1 @ Dec 3 2009, 09:02 AM) planning to do this mod very soon....but before that, need the help of Sifus here... i've noticed the cam timing for our 4G15 is different between a Carbie and EFI models..append below is the spec sheet... hence, can anyone confirm this and if so, would it be worthwhile to change my stock Carbie Cam to the EFI version for better engine efficiency as the exhaust valve timing for the EFI opens later compared to the Carbie model... members advise is highly appreciated...many thanks... that is 16valve 4g15 datasheet... we only have 12 valve 4g15....  |
|
|
|
|
|
jason4883
|
Mar 20 2011, 07:43 PM
|
|
|
Tumpang thread here,
So which brand of cam gear is good? Aerospeed? HKS? Works Engineering?
As other forumers said in previous replies, it's all about how the tuner(s) tune the gadget. If it's tuned correctly, it won't harm the engine, much right?
|
|
|
|
|
|
the_catacombs
|
Mar 21 2011, 08:53 PM
|
|
|
QUOTE(jason4883 @ Mar 20 2011, 07:43 PM) Tumpang thread here, So which brand of cam gear is good? Aerospeed? HKS? Works Engineering? As other forumers said in previous replies, it's all about how the tuner(s) tune the gadget. If it's tuned correctly, it won't harm the engine, much right? yes correct |
|
|
|
|
|
tictac
|
Mar 21 2011, 11:00 PM
|
Member
|
QUOTE(tictac @ Mar 20 2011, 03:57 PM) that is 16valve 4g15 datasheet... we only have 12 valve 4g15.... 4g15 12valve (fuel injection) stock Camshaft profile - Intake Valve open : 17 degree BTDC - Intake Valve Close : 55 degree ABDC - Exhaust Valve Open : 59 degree BTDC - Exhaust Valve Close : 17 degree ATDC Intake : 252 degree Exhaust : 256 degree  This post has been edited by tictac: Mar 22 2011, 06:51 AM |
|
|
|
|
|
jason4883
|
Mar 22 2011, 12:57 AM
|
|
|
QUOTE(the_catacombs @ Mar 21 2011, 08:53 PM) Then I should source for cam pulley soon, real soon. Again which brand is recommended? |
|
|
|
|
|
tictac
|
Mar 22 2011, 07:57 AM
|
Member
|
Even with Stock camshaft... the adjustable cam can tune Air Fuel Compression efficientcy.
This is with Adjustable cam + Stock 4G15 EFI Camshaft :
Stock 0 Degree : Air Fuel Compression 69% Efficiency
Advanced 2 Degree : Air Fuel Compression 70% Efficiency
Advanced 4 Degree : Air Fuel Compression 71% Efficiency
Advanced 6 Degree : Air Fuel Compression 72% Efficiency
Advanced 8 Degree : Air Fuel Compression 73% Efficiency
Advanced 10 Degree : Air Fuel Compression 75% Efficiency
|
|
|
|
|
Quote
0.0233sec
1.22
5 queries
GZIP Disabled