Hey guys just have a couple quick questions about running a big 16g ported with 34mm internal gate paired with a set of 274 regrind cams. The reason why i ended up with these cams is because i was convinced to get these over the 272 regrinds.

I'm currently in the process of building my motor and getting ready to put it back in my car in the next month or so. My build consists of the following

7 Bolt motor
Evo 9 pistons .040 over
6 bolt rods with arp's
oem crank
debur ported head
manley valve springs
graveyard motors valves with 5 angle grind
274 regrind cams. 200 duration @ .050 .408 lift
viton valve seals
fp race manifold
MHI big 16g ported with 34mm internal gate
obx o2 housing w/ external dump
2.75" to 3" catless downpipe
Apexi N1 catback
Walbro 255 or FP 255

For break in i plan on running the stock tune but i will have a new fuel pump installed. I will have the injectors and ecmlink by the time i am done breaking in the motor, i am just a little tight on cash right now.

Are these cams too agressive for my setup? I do plan on running 20-22 pounds on 93 pump gas and pulling to 8k rpm. I hope that these cams aren't too much for what i am doing.

Any questions that you have for me or about my build just ask away. Open to suggestions

IMO.. i don't think so, i think they will work well!!
Sorry im dead tired and will try to explain more in detail manana!

Anyone??

To get the best power curve out of a B16G I would honestly go with a 264/272 cam setup. I personally have ran FP2's with a Evo 3 turbo and it ran well but I did lose some lower end torque that could have been kept had I used a 264/272 combo and the turbo seemed to make max power by 6K RPM. I would use 274's on a setup with a 50 trim turbo or bigger because with a larger you are not really concerned about low end torque but rather quick spool time and top end power. With a B16g you won't be able to use the full output of the 274 cams.

well the thing is i have the cams sitting in a box under my bed...not even sure if i can exchange them for 272 regrinds.

You're not going to pull to 8k with a 16g.

Do you ever plan on upgrading the turbo in the future? If so just keep the cams. You could find someone that's willing to trade there 272 cams.

I would like ot eventually upgrade to a bigger turbo in the future, maybe a 20g or a hx35 setup but this might not be until next yera so by then imnot sure what i am going to be doing with the car.

Also, what is the highest rpm people pull too with a big 16 ported? I will most likely be swaping these 274s for a set of a 272s before i build my motor.

I think we have found out (on my thrread) that if you get some adjustable cam gears you will be able to play with the power band on these cams, i am running a evo3 16g and it pulls really hard all the way to 7500. i have a set of unorthadox cam gear coming my way so i will be able to help you out on the best place to set the gears, but i think you should keep them buy some adjustable cam gears and get them dialed in to make the 16g still spool fast and stay streetable, they when you up grade turbos you can adjust them again for that turbo..

yea dsmgsx thats what i was thinking..just gotta find a set now..

Still trying to find out if it is okay that i break in the motor on stock boost 10-12psi with all the mods i have listed but without ecmlink or injectors.

Will i be able to break in my motor on stock tune/fueling with these 274 cams and the big 16g at waste gate pressure?

You should be okay if you stay out of boost, but ideally you would have atleast some way to keep track of afr's with a wideband. I don't see a fpr with/in your mod list. Probably not a good idea to have a big fuel pump without an aftermarket fpr.

The cams are a little big for your application, but it gives you good overhead if you get a bigger turbo.

I will have a innovate wideband hooked up before i start the motor so i will be able to monitor my AFR's

As far as the AFPR, i am thinking about doing the complete fuel line kit so there would be an afpr in there. That is of course, depending on my money situation when i go to drive the car. There are multiple threads of people running 255lph's with the stock FPR and not having any issues.

I know you are able to run up to 14psi with a big16g on stock tune/fueling but with these 274's in the mix, im not sure if there will be enough fuel for 12psi and these upgraded cams.

All this is so silly. These cams have lower effective duration than fp1 cams or hks 264s. . . And rather weeny lift. . . considering the current market. So what's with all the guesses that they are "big".

the actual lift is .408" and this is more agressive than HKS' 280 cams

dsm-onster said:

All this is so silly. These cams have lower effective duration than fp1 cams or hks 264s. . . And rather weeny lift. . . considering the current market. So what's with all the guesses that they are "big".

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This is exactly what I've been finding. BC's "280" is comparable to Kelfords "264". Their 272 hardly qualifies as a big camshaft in today's market.

As I understand it Sandman, if you are still using a mass airflow sensor (MAF), it'll compensate just fine to the added airflow of a camshaft upgrade.

Sandman817 said:

the actual lift is .408" and this is more agressive than HKS' 280 cams

Click to expand...

Not really.

BC 272 lift :Specs:
Duration @ .050": 212*
Lift: 10.1mm / 9.66mm

HKS 280: Intake 4G63BT 280 10.8
HKS 280: Exhaust 4G63BT 280 10.2

Also, .408" = 10.3632mm

Sandman817 said:

the actual lift is .408" and this is more agressive than HKS' 280 cams

Click to expand...

Yes. See above. That is NOT true.

But more importantly. Are you suggesting that lift means so much that it is more valuabe to a build than the actual effective duration? Evein if it did have more lift than hks 272s, the baby effective duration would just give you a little more air at still a far lower peak rpm. You need to research exactly how a cam works. Then you will be more than capable of deciding what you need/want.

Duration is king; the effects of lift is relative and just the crown.

woops, my source for the information was incorrect.

On a side note, i am going to be swapping these for some HKS 272 regrinds so i will get back some of the low end torque i would loose with the 274's, or do you recomend that i keep these cams as they are suitable for my setup?

Sandman817 said:

do you reccommend that i keep these cams as they are suitable for my setup?

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Your cam: 200 degrees @ .050
(.408")10.36 mm lift.

HKS 272
Advertised Duration - 272 deg
Effective Duration - 214 deg @ 1mm(.040")
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 110 deg Int / 110 deg Exh
LSA - 110 deg
Stock valve springs OK

The 2 different "effective duration" lift specs make direct comparison guesswork at best. What manufacturer's grind is your 274 based on? In the little poking about I've just done, I cannot find those specs on any of the more well known cam mfg.ers. Are both intake and exhaust of your cams the same 200/.408?

My best guess is that these 2 camshafts will perform very similarly in your application, given what little info I have to go on. Your cam looks to be less aggressive, duration-wise than the BC 272, which is not considered to be an especially radical 272.

Who's grind do you trust most?

the 274 is a custom grind cam that graveyard motorsports puts their name on but has Delta Cams actually grind. I will contact delta tomorrow and get exact specs for these 274's.

As far as who i trust, i trust Delta, hks and BC. I've heard great things from all the companies, but it just happend to be alot cheaper for me to get a set of delta regrinds