Last week I posted up a question about Camshaft Combinations.
Two members tried to help. But, I am looking for a much more advanced answer.
The PRO’s and CON’s
More specifically why would some one want to run a Camshaft Combination of 272intake – 280exhaust, over a 280intake – 280exhaust Combination or 280intake – 272exhaust, over a 280intake – 280exhaust Combination.

Over 170 members have viewed my original post. So, I come to the conclusion that there are other interested in an answer to my question.
My ORIGINAL Post name: “Cam Combinations Need a little help”
https://www.evolutionm.net/forums/sh...57#post4043157

Thank you for your time,

 

Well the 272 degree duration intake cam has smoother more consistent idle speeds and better driveability characteristics due to more available engine vacuum being created than the 280 deg.duration cam. As far as the exhaust cam the 280 deg.version will always make more overall power than a 272 deg.simply by creating more overlap and longer duration valvetrain type events. I bet you're considering the GSC Motorsport IX cams huh? I'm however still on the fence regarding IX cams,because I'm still waiting to see what other companies bring to the table.


Cheers

 

The gsc cams for the IX will provide a much better overall powerband with more usable torque and a gain of ~15 awhp.

Anybody have the cam card of the cossie ix cams?

 

FWIW,
I've been running the 280/272 combo for about 6-8 months now. I use the car as a semi-DD and road course racing. My car has been very competitive and can run with all the big dogs except the Viper GTS modified & a modded 06 ZO6 down the long part of the straights(they walk me about 12-15 car lengths). However, I'm running an AEM EMS, so drivability isn't an issue. I did end up trashing my stock clutch and have since added a Carbonetics twin, I also added a 3.5" exhaust, so my car spools very quickly and pulls harder up top now. If you start adding power, you may eventually be needing a new clutch.
My advice is go with the cam combo that will best suite your driving style. If you don't know a good tuner, then don't even think about the 280's, as idle will be an issue. Other than that I love the combo.

 

Thanks for the get-backs!!!
I’m sorry if my post seems to go off in a few different directions. But, this is a response for two threads.
If a passing MOD would please merge the two thread together. “Thank You in advance”
Any way, still NO real answers why would some one want to run a Camshaft Combination of 272intake – 280exhaust, over a 280intake – 280exhaust Combination or 280intake – 272exhaust, over a 280intake – 280exhaust Combination.

The available MIVEC cams I am looking at 1st and for most is RIPP Modifications custom 280 Intake – 280 Exhaust, 272 Intake – 272 Exhaust or the COSWORTH 272 Intake – 272 Exhaust. I have heard of GSC Motorsport Cams and TurboTrix’s custom 280 Intake – 280 Exhaust cams.
But, getting MIVEC cams are no issue here, it’s what Camshaft Combination is best for me.
Every one I know running 280 Intake – 280 Exhaust like J. Gunnz, Guys like Brandon running 280 Intake – 272 Exhaust, or Joe “rjsdxm” running a stock IX Intake – 280 Exhaust are all running bigger turbos.
I just want the most power I can get from my stock 16G.

I’m not worried about the 280’s being lumpy!!!
Perry “P.R.A. Tuning” did an awesome job tuning J.Gunnz’s Evo IX with RIPP’s custom 280 Intake – 280 Exhaust Cams.

Now, Sgt Blamo,
Why the 280/272 combo? How did you know what to expect from that combo? Why not 272/280 or 280/280?

 

Not enough info huh? Okay,well first is you're vehicle a daily driver
or maybe its a street n strip deal which FYI is the most difficult?
If the answer has the word daily in it then absolutely go with the
272 deg.intake cam and 280 deg.exhaust combo.This choice is the
best of both worlds because it will provide the torque down low
for the stop n go type driving and the top end HP for the strip and
for some highway pulls.The 280/280 deg.int.and exh.cams will
ultimately provide the highest HP gains on the top end but
will definitely lose torque all over the usable powerband.
Then stop n go driving will require more RPMs to provide the
same torque which was previously available at lower RPMs
with the 272 deg.intake.and the stock cams.Now the one thing
that the Evo IXs have which really helps out this situation is the Mivec cam timing
system which will always help produce the most available torque
throughout the entire powerband. This all should help you make
your decision.FYI there is another post here on the GSC Motorsport Vender
forum that another member had previously asked Greg there I believe.

Later

 

why wont you just do a search or get on the phone with AMS/ BR they'll be more than willing to answer your questions!

 

Thank you Boost.
Now, thats something I can use!!!
You have been very helpful.

Thanks again,
Buk,

 

first off the very last think you want to do is mix a cosworth intake or GSC Intake and a different exhaust cam. mixing and matching different manufactures is very bad.

that being said we no longer have a 280 intake for the mivec cars. they are sold out and gone.

Our new mivec cams are as listed. they are sold in a set and will NOT be seperated.

S1= 268 10.98mm / 266 10.3mm
S2=274 11.2mm / 272 11.0mm

The s1 is for sub 500whp cars. and you should NOT go to the S2 if you're under that. you will give up HP do to to much camshaft and not enough volumn out of the turbo. our line is setup for motors please understand that bigger isnt always better with camshafts.

 

I might also add that attempting to judge cams from different manufacturers using advertised duration as reference (e.g. '272', '280', etc.) is an unwise proposition. For example, there is a HUGE difference between HKS 272s and JUN 272s. Terms like '272' are only of limited value and can be potentially misleading. Be advised!

There is more to be considered if one intends to make an intelligent decision. When in doubt, ask the manufacturer, or better, post ALL published specs here for the cam set in question and ask.

FYI

 

You have two choices as far as Im concerned for an IX. Cosworth and GSC. Do a search on those two cams, and like Ted B said, dont be so stuck on advertised duration. You need to be more concerned about the lift. Cosworth claims 272 cams, but the lift is 11.0 on intake and exhaust. GSC's like Greg said are 10.98 intake, 10.3 exhaust for S1's since your using stock turbo. I think the cosi's are just a touch more aggressive. Do a search on IX cams and those two names should come up the most. Check out the posts, dynosheets, commentary, whatever. Then make your choice. Thats how you research.

 

Greg, Thank You!!!
I had NO intention of mixing and matching different Cams from different manufactures only Cam sizes if needed to achieve my goal.
My goal is to only find the best Cam set or Cam Combo that fit my needs. A daily driver / street n strip running a Stock IX Turbo, AMS FMIC & Lower ICP, Full 3" TBE, pushing 22-24 PSI on E85 fuel.
That why I spent so much time pushing to get all the INFO out here.
I gotta run,
But Thank You again for sheading new light on this for me and every one else who also wanted to know.
Buk,

 

Subscribed =P

 

There was a shop on here who mixed and matched a 272 and 280 in order to get a certian powerband for the type of racing they were going to be doing... I'm sorry I can't remember the thread, but that is another thing to consider...

I opted for both 280's for my VIII, reason being I like to drag race, and Buscher's dyno results showed NO LOSS of low end power with the bigger cams... what I can tell you from seat of the pants is that if you're sitting at 3000 rpm and decide to hit the gas, you're not going to be set back any harder than with the stock cams, IMO.. however, once you hit 5K+ it's another story. With less duration, this would change.

So in other words, it's not about if you want to lose any low end, it's about where do you want to gain the power at?

 

Personally I'm going with a GSC IX Exhaust Cam.. on my IX. I'll see how it does at the track later this month