B-series Camshaft Specifications
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From: TX
B-series Camshaft Specifications
I have been trying to gather as much camshaft information as I can for my own benefit and helping me decide on cams for my own application, but I though this would be a nice "sticky" for H-T.com. If you know of any specifications for cams not shown or additional data for cams that I do show, please post it and I will update the charts and graphs. I have emailed several manufacturers requesting additional information, so that the cams can all be compared on the same basis for duration, as its hard to compare the todas with the other, becauase the only information available is the 0mm lift numbers.
Modified by BryanPendleton at 4:39 PM 3/10/2004
Modified by BryanPendleton at 7:12 AM 5/18/2006
Modified by BryanPendleton at 4:39 PM 3/10/2004
Modified by BryanPendleton at 7:12 AM 5/18/2006
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From: Get Firefox, CA, USA
Re: B-series Camshaft Specifications (BryanPendleton)
the problem is that there are other aspects that make up a good cam design. ramp angle is a big factor in how much power its going to make.
thats partially why the toda b's dont make as much power as skunk stage 2's
but otherwise helpful, thanks
thats partially why the toda b's dont make as much power as skunk stage 2's
but otherwise helpful, thanks
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From: Phoenix, Arizona, United States
Re: B-series Camshaft Specifications (Bob-DC2)
Good information but the abr graph makes the Toda cams look like they have the most duration when they actualy have some of the least. Toda cams have very aggresive ramp angles and little duration (except for maybe the D's) It looks like the graph is measuring Todas addvertised duration versus the other cams duration @ some sort of lift.
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Thread Starter
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From: TX
Re: B-series Camshaft Specifications (asubennett)
I am aware of the differences in measuring method for cam duration. That is why I specifically list how each data set is measured and I supplied the chart with all the data I have. I had to display something for the chart, and I simply used what was available for the chart. You simply have to consider that when using this data/chart or any came spec data with regard to cam duration.
Most of the data, is based on the manufactures specifications sheet, except for the Toda's, I am going to contacting them by phone to get some more specs on their cams.
Naturally the lift and duration specs only tell a small fraction of the story with regard to camshaft. You can take 1 lift spec and one duration spec and make an infinite amount of profiles that will have that same lift and duration. Unfortunately, most cam manufacturers are not gernerous enough to share cam lobe profile charts.
Short duration/large lift vs. Long duration/short lift. Its generally comes down to compromise, and perhaps some of the experienced tuners can chime in here. I believe, but not certain, that long duration short lift are more difficult to tune than short duration large lift. From a reliability standpoint and wear standpoint, longer duration and shorter lifter will generally be less strenuous on your drivetrain, but again it depends on the specific profile shape. Obviously you have to check for proper piston-to-valve clearances with too much duration. Longer duration cams also sacrifice dynamic compression, as now your valves are open longer, which limits how much the mixture is actually compressed. Its a delicate balance of lots of factors that must be understood to properly select cams and build a motor. You are going to have many many different opinion with regard to how to "properly" build and motor and cam it, as every builder has his own experiences.
Modified by BryanPendleton at 2:36 PM 3/10/2004
Most of the data, is based on the manufactures specifications sheet, except for the Toda's, I am going to contacting them by phone to get some more specs on their cams.
Naturally the lift and duration specs only tell a small fraction of the story with regard to camshaft. You can take 1 lift spec and one duration spec and make an infinite amount of profiles that will have that same lift and duration. Unfortunately, most cam manufacturers are not gernerous enough to share cam lobe profile charts.
Short duration/large lift vs. Long duration/short lift. Its generally comes down to compromise, and perhaps some of the experienced tuners can chime in here. I believe, but not certain, that long duration short lift are more difficult to tune than short duration large lift. From a reliability standpoint and wear standpoint, longer duration and shorter lifter will generally be less strenuous on your drivetrain, but again it depends on the specific profile shape. Obviously you have to check for proper piston-to-valve clearances with too much duration. Longer duration cams also sacrifice dynamic compression, as now your valves are open longer, which limits how much the mixture is actually compressed. Its a delicate balance of lots of factors that must be understood to properly select cams and build a motor. You are going to have many many different opinion with regard to how to "properly" build and motor and cam it, as every builder has his own experiences.
Modified by BryanPendleton at 2:36 PM 3/10/2004
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Re: B-series Camshaft Specifications (BryanPendleton)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BryanPendleton »</TD></TR><TR><TD CLASS="quote">I am aware of the differences in measuring method for cam duration. That is why I specifically list how each data set is measured and I supplied the chart with all the data I have. I had to display something for the chart, and I simply used what was available for the chart. You simply have to consider that when using this data/chart or any came spec data with regard to cam duration. </TD></TR></TABLE>
cool
maybe a project I can start in about 1 or 2 months is having people who have an extra set of cams waiting for their motor to get built, and have them sent to a lab to get everything measured.
when my motor was getting built, i would have been happy to send out my cams.
i might be able to cover costs of the lab testing if people are willing to pay for shipping of cams to and from.
cool
maybe a project I can start in about 1 or 2 months is having people who have an extra set of cams waiting for their motor to get built, and have them sent to a lab to get everything measured.
when my motor was getting built, i would have been happy to send out my cams.
i might be able to cover costs of the lab testing if people are willing to pay for shipping of cams to and from.
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From: TX
Re: B-series Camshaft Specifications (importboi22)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by importboi22 »</TD></TR><TR><TD CLASS="quote">im pretty sure thats wrong i think the real specs on the skunk2s2 was 12.05mm lift</TD></TR></TABLE>
The data that is up there came off Skunk2's Cam specification sheet that they sent me a few days ago. Its a Word document. Send me an email and let me know if you want a copy.
The data that is up there came off Skunk2's Cam specification sheet that they sent me a few days ago. Its a Word document. Send me an email and let me know if you want a copy.
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From: Phoenix, Arizona, United States
Re: B-series Camshaft Specifications (Miracle_X_Bar)
Seriously this is a good write up. I was just concerend that by putting it on the bar graph even though there are asterisks and diclaimers about measured lift and duration and advertised lift and duration/ that b/c they are on the same grafff it will make things confusing. You should do one graff with adver. specs, one with specs @ .050 lift, and actual measured specs if that last one is ever possible.
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From: TX
Re: (00 FBP ItR)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 00 FBP ItR »</TD></TR><TR><TD CLASS="quote">How about primary and secondary lobe??
Its not always about the vtec lobe.
</TD></TR></TABLE>
If you are racing on the primary and secondary lobe, we need to have a talk.
That would be good info to get a feel for daily driveability and fuel economy of the cam set. I may look into that. It would required me to tall just about every manufacturer though.
Its not always about the vtec lobe.
</TD></TR></TABLE>If you are racing on the primary and secondary lobe, we need to have a talk.
That would be good info to get a feel for daily driveability and fuel economy of the cam set. I may look into that. It would required me to tall just about every manufacturer though.
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From: NAR SPEC.com, So Cal, US
Re: (BryanPendleton)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BryanPendleton »</TD></TR><TR><TD CLASS="quote">
If you are racing on the primary and secondary lobe, we need to have a talk.
</TD></TR></TABLE>
There's a thing called midrange too, isn't there?
If you are racing on the primary and secondary lobe, we need to have a talk.
</TD></TR></TABLE>
There's a thing called midrange too, isn't there?
