Cam duration
Thread Starter
Instructor
Joined: Aug 2001
Posts: 192
Likes: 1
From: Brackley Northamptonshire
Cam duration
Before I was aware of this forum I chose to change my cam for something a little more daring, did a little research, got some advice and bought and installed a cam with the following spec:
SB-Chevy (87-Up): Hydraulic Roller
Grind: 264 Lift: .487''/.495'' RPM Range: 1200-5200 and the lobe separation is 110 deg
Is the standard 112 deg for a L98 Vette? My Fast chip is programmed to the 110 duration but what difference to performance will 110 make over 112?
:confused:
SB-Chevy (87-Up): Hydraulic Roller
Grind: 264 Lift: .487''/.495'' RPM Range: 1200-5200 and the lobe separation is 110 deg
Is the standard 112 deg for a L98 Vette? My Fast chip is programmed to the 110 duration but what difference to performance will 110 make over 112?
:confused:
Melting Slicks
Joined: Jan 2003
Posts: 2,167
Likes: 0
From: What did the 5 fingers say to the face? SLAP!!
Re: Cam duration (Gareth)
stock L98 LSA is 114. 110 will have a choppier idle. Tighter LSA is supposed to help breathing at the upper RPMS if I remember correctly.
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Re: Cam duration (Gareth)
Alittle bit more mid-range, a little more lope, and a little less vac. at idle. Little is the key word here. Not a lot of change in any areas, if your ECM can handle it. The 112 would give a broader TQ curve, and a little more top end. Just my .02.
:chevy
[Modified by Curveit, 10:43 PM 4/13/2003]
:chevy
[Modified by Curveit, 10:43 PM 4/13/2003]
Drifting
Joined: Dec 2002
Posts: 1,861
Likes: 4
From: Houston TX
Re: Cam duration (Curveit)
As a general rule, a tighter LSA (smaller numerically) will increase peak power numbers at the expense of a shorter RPM range from peak TQ to peak HP. A wider LSA will have more idle vacuum with a smoother idle, and will have a wide power band at the expense of lower peak numbers.
Cam duration is determined by stroke length and desired RPM for peak HP.
Cam duration is determined by stroke length and desired RPM for peak HP.
Thread Starter
Instructor
Joined: Aug 2001
Posts: 192
Likes: 1
From: Brackley Northamptonshire
Re: Cam duration (MSR)
One of the many parameter questions that fast chip asked before programming was LSA. Before the chip my timing was well out and you could hear most of the power going straight out of the exhaust. The difference the chipmade was fantastic.
Thanks for the help guys, I thought I may have made a big mistake but I am less concerned now that my pennies were spent ok. :thumbs:
Thanks for the help guys, I thought I may have made a big mistake but I am less concerned now that my pennies were spent ok. :thumbs:
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
Re: Cam duration (Gareth)
I just got off the the phone with John at fastchip before I logged on here. I am trying to swap in a motor with a 110 LSA , 242/248 .050 cam. He said hmm....you should get a 112 for vacuum purposes. Gonna have to ask Ed about this one. Give me a call Tuesday. This 110 cam is typically for carburetors." I will see what they say tomorrow........
Drifting
Joined: Dec 2002
Posts: 1,861
Likes: 4
From: Houston TX
Re: Cam duration (89 Paul in Cal)
I just got off the the phone with John at fastchip before I logged on here. I am trying to swap in a motor with a 110 LSA , 242/248 .050 cam. He said hmm....you should get a 112 for vacuum purposes. Gonna have to ask Ed about this one. Give me a call Tuesday. This 110 cam is typically for carburetors." I will see what they say tomorrow........
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Thread Starter
Instructor
Joined: Aug 2001
Posts: 192
Likes: 1
From: Brackley Northamptonshire
Re: Cam duration (Gareth)
Ok, ok, I'm out of my depth a bit with all the tech stuff, what I would really like to know is when I put my foot down what difference would it make assuming my chip is doing all the correct compensating?
:steering: :confused:
:steering: :confused:
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
Re: Cam duration (Gareth)
Update
Just got off the phone with John at fastchip. He spoke to Ed and Ed said he cannot tune a chip for a cam with 110* LS and the kind of lift mine has. said it would have no idle/vac and that my 89's computer is too slow. I oughta get a DFI and it tune it myself he said.
Bummer. :banghead:
oh yeah, also said that they can't tune "Accel" brand injectors....that they suck! I wanted to re-use mine but no dice.
Who can tune this chip for me? Anyone know? 242/248 .050 and 110* LSA
[Modified by 89 Paul in Cal, 1:49 PM 4/15/2003]
Just got off the phone with John at fastchip. He spoke to Ed and Ed said he cannot tune a chip for a cam with 110* LS and the kind of lift mine has. said it would have no idle/vac and that my 89's computer is too slow. I oughta get a DFI and it tune it myself he said.
Bummer. :banghead:
oh yeah, also said that they can't tune "Accel" brand injectors....that they suck! I wanted to re-use mine but no dice.
Who can tune this chip for me? Anyone know? 242/248 .050 and 110* LSA
[Modified by 89 Paul in Cal, 1:49 PM 4/15/2003]
Drifting
Joined: Aug 2000
Posts: 1,521
Likes: 0
From: West Islip New York
Re: Cam duration (89 Paul in Cal)
Try Chris at TPIS.
Thats the problem with fastchips, they claim to sell a custom chip for your application, but they can't program for Accel injectors, make you use a 160* thermostat - come on, this is custom ?
Good luck........
Thats the problem with fastchips, they claim to sell a custom chip for your application, but they can't program for Accel injectors, make you use a 160* thermostat - come on, this is custom ?
Good luck........
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
Re: Cam duration (1MoorTym)
Try Chris at TPIS.
Good luck........
Good luck........
Am gonna try 3 other companies and if no luck, cam comes out.
Apology to Gareth for hijacking your thread. Sorry mate.
I just want to log my experience so others reading this don't suffer too.