160/108 blm split after cc503 install. logs attached - Help...! :)
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,135
Likes: 17
160/108 blm split after cc503 install. logs attached - Help...! :)
Hi Guys,
I've just finished installing a CC503 cam, 1.52 cc full roller rockers, 918 springs and a msd opti. The install went smoothly but now the thing will barely idle
. I expected a somewhat rough idle from the CC503 but this is nuts..
Datalogging the car i see the blms are 160/108 and the o2 are allmost static at 400/800.
I have never swapped a cam before - is either of those blms sane? should they be that far off at idle?
here are the Datamaster logs:
This one is wierd check out the left O2 - it drops out of the blue!
http://mdremote01.md-asp.com/daniel/...rpm_to_625.uni
changed the chipto see if that di anything to the logs:
http://mdremote01.md-asp.com/daniel/...idle-part1.uni
http://mdremote01.md-asp.com/daniel/...idle-part2.uni
Please let me know what you think
Thanks
Daniel
I've just finished installing a CC503 cam, 1.52 cc full roller rockers, 918 springs and a msd opti. The install went smoothly but now the thing will barely idle
. I expected a somewhat rough idle from the CC503 but this is nuts.. Datalogging the car i see the blms are 160/108 and the o2 are allmost static at 400/800.
I have never swapped a cam before - is either of those blms sane? should they be that far off at idle?
here are the Datamaster logs:
This one is wierd check out the left O2 - it drops out of the blue!
http://mdremote01.md-asp.com/daniel/...rpm_to_625.uni
changed the chipto see if that di anything to the logs:
http://mdremote01.md-asp.com/daniel/...idle-part1.uni
http://mdremote01.md-asp.com/daniel/...idle-part2.uni
Please let me know what you think
Thanks
Daniel
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Since you never installed a cam before, are you sure your lifter preload adjustment is correct?
What method/procedure did you use? I really hope it's the Intake Closing (IC)/ Exhaust Opening (EO) method.
Sure, there are other possible causes, like the programming, vacuum leak, etc., but I'd start there, with the preload settings. In other words, if the mechanical part isn't right, re-programming isn't going to fix it.
Jake
What method/procedure did you use? I really hope it's the Intake Closing (IC)/ Exhaust Opening (EO) method.
Sure, there are other possible causes, like the programming, vacuum leak, etc., but I'd start there, with the preload settings. In other words, if the mechanical part isn't right, re-programming isn't going to fix it.
Jake
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,135
Likes: 17
Hi Jake,
The new roller rockers uses poly locks, so i just used my fingers to tighten down the nut until i felt the slightest bit of resistance. I then added 3/8th of a turn and locked them down. I did this with the intake off and only adjusting the non lifted ones. I finished off by turning the engine slowly by hand and feeling for lash.
I think i have tracked the insane split blms to the left o2 having an intermittent ground. I pulled the O2 sensor, bench checked it with a blowtorch and put it back in. It seems to be working just fine now, alternating between 200 and 900 mv and generally acting like the other sensor. They now both agree that the car is filthy rich at idle with blms at 108.
After lowering the entire lower ve table (the one that only goes to 2000rpm.) by 20% I still have split blms allthough not quite as bad, 109/125 at idle and 125/134 cruising @ 1300 rpms in 4th. The left is allways the rich one though.
Is it normal to lower the entire VE table at < 2000 rpm when installing a cam? Shouldn't it be the other way around? more efficient cam = more fuel?
Thanks,
Daniel
The new roller rockers uses poly locks, so i just used my fingers to tighten down the nut until i felt the slightest bit of resistance. I then added 3/8th of a turn and locked them down. I did this with the intake off and only adjusting the non lifted ones. I finished off by turning the engine slowly by hand and feeling for lash.
I think i have tracked the insane split blms to the left o2 having an intermittent ground. I pulled the O2 sensor, bench checked it with a blowtorch and put it back in. It seems to be working just fine now, alternating between 200 and 900 mv and generally acting like the other sensor. They now both agree that the car is filthy rich at idle with blms at 108.
After lowering the entire lower ve table (the one that only goes to 2000rpm.) by 20% I still have split blms allthough not quite as bad, 109/125 at idle and 125/134 cruising @ 1300 rpms in 4th. The left is allways the rich one though.
Is it normal to lower the entire VE table at < 2000 rpm when installing a cam? Shouldn't it be the other way around? more efficient cam = more fuel?
Thanks,
Daniel
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,135
Likes: 17
Well - more overlap = lower ve a low rpm....
and thanks to Jake! - i redid the lash on all my lifter by compcams specs - they said .030" wich is = to 3/4 of a turn on 3/8 studs (half a turn on 7/16) and not 1/4 as i had..
also i had some rubbing on the inside of the valve covers.
all fixed now and the blms are right inline
so now its time to tune for power
Thanks again
/Daniel
and thanks to Jake! - i redid the lash on all my lifter by compcams specs - they said .030" wich is = to 3/4 of a turn on 3/8 studs (half a turn on 7/16) and not 1/4 as i had..
also i had some rubbing on the inside of the valve covers.
all fixed now and the blms are right inline
so now its time to tune for power
Thanks again
/Daniel
Burning Brakes
Joined: Apr 1999
Posts: 758
Likes: 1
From: Cumming GA
Hi Jake,
The new roller rockers uses poly locks, so i just used my fingers to tighten down the nut until i felt the slightest bit of resistance. I then added 3/8th of a turn and locked them down. I did this with the intake off and only adjusting the non lifted ones. I finished off by turning the engine slowly by hand and feeling for lash.
I think i have tracked the insane split blms to the left o2 having an intermittent ground. I pulled the O2 sensor, bench checked it with a blowtorch and put it back in. It seems to be working just fine now, alternating between 200 and 900 mv and generally acting like the other sensor. They now both agree that the car is filthy rich at idle with blms at 108.
After lowering the entire lower ve table (the one that only goes to 2000rpm.) by 20% I still have split blms allthough not quite as bad, 109/125 at idle and 125/134 cruising @ 1300 rpms in 4th. The left is allways the rich one though.
Is it normal to lower the entire VE table at < 2000 rpm when installing a cam? Shouldn't it be the other way around? more efficient cam = more fuel?
Thanks,
Daniel
The new roller rockers uses poly locks, so i just used my fingers to tighten down the nut until i felt the slightest bit of resistance. I then added 3/8th of a turn and locked them down. I did this with the intake off and only adjusting the non lifted ones. I finished off by turning the engine slowly by hand and feeling for lash.
I think i have tracked the insane split blms to the left o2 having an intermittent ground. I pulled the O2 sensor, bench checked it with a blowtorch and put it back in. It seems to be working just fine now, alternating between 200 and 900 mv and generally acting like the other sensor. They now both agree that the car is filthy rich at idle with blms at 108.
After lowering the entire lower ve table (the one that only goes to 2000rpm.) by 20% I still have split blms allthough not quite as bad, 109/125 at idle and 125/134 cruising @ 1300 rpms in 4th. The left is allways the rich one though.
Is it normal to lower the entire VE table at < 2000 rpm when installing a cam? Shouldn't it be the other way around? more efficient cam = more fuel?
Thanks,
Daniel
remember these O2 are switching ego sensors, so once you get a little rich or a little to lean, they peg out and stop providing to the ECU.
making it perfect is going to be a bitch with the EGO sensors
I recommend a stand alone wide band O2 to dial it in.
