Whats the timeing events for these cams mean?

[iwannagofast89]

Cam Number - BC 0101

Longer duration profile, added rpm potential. Intended for fully built engines. Tuning and ECU mods recommended. Requires Spring and Retainer kit # BC0100.

Advertised Duration - 280/280 Degrees

Duration at .050" - 218/216 Degrees

Lift in inches - .422"/.418"

Lift in mm - 10.71mm/10.60mm

MUST USE with Brian Crower Spring and Retainer Kit # BC 0100

Timing Events
7 BTDC
-1 ATDC
31 ABDC
39 BBDC

Cold Valve Lash
.000"INT/.000"EXT

 

[90laserRSfwd]

I have those BC 280's too. I'm wondering the same thing.

 

[iwannagofast89]

well I'm build my motor up and wondering if there is some timing issue involved when putting them in. But thank you....planning on going to Bandimeir next summer

 

[iwannagofast89]

did you use your stock valve train

 

[lenny 15]

It would be pointless to put 280's into your car unless you are building your entire valve train and bottom end to handle 9k+ redline. If you kept the stock valve train, you would not be able to go past 7k rpm. You would kill your powerband if you didn't have a huge turbo, and a built bottom end and head. Most cars couldn't even use the high rpm powerband that the 272's have, let alone the 280s. If you want cams, go with the 264 intake cam and 272 exhaust cam, and they would be perfect with a 16G turbo. Also what are your plans for the car? It would help if you listed your mod's in your profile so everyone can see what you have done, and give better advise.

 

[iwannagofast89]

well i guess i didnt really mean it by that, kind of like can I mix match the cams from the valves, valve spring and retainers.......are titanium really good??

 

[1gDSM4g63]

You have to update your car profile. We don't know what you're going for. It seems like you are in over your head buying too high of performance stuff then you need. Overcompensating parts will not make you car faster. It'll make your car slower.

I mean getting 280/280 cams is going pretty deep and in order to maximizes the performance you'll need to have your head built, i.e. dual springs, ti retainer, valves, big turbo, fuel system upgrade, etc...

 

[TunaTalon]

"The usual cam functions (also known as valve events) are Intake Opening Point, Intake Closing Point, Exhaust Opening Point, Exhaust Closing Point, Overlap, Lobe Separation Angle, and Valve Lift."
http://www.tmossporting.com/tabid/3714/Default.aspx

All references to RPMs, cams and the 4G63 assume 2.0L displacement. The valve train knows nothing about displacement, only air flow. For 2.3L engines the air flow required from the valves at 7000 RPM is the same as the 2.0L at 8000 RPM.

If your engine is the 2.0L version those 280 cams will make the daily drive a pain and should be one of your last upgrades.

 

[TunaTalon]

Regardless of the normal sequence of cam events, that 4G63 would run better if the events were in the order of:
7 BTDC Intake valve opens
-1 ATDC Exhaust valve closes
31 ABDC Intake valve closes
39 BBDC Exhaust valve opens

Intake valve open 7 + 180 + 31 = 218 duration
Exhaust valve open 39 + 180 -1 = 218 duration

Intake Valve opens 7 BTDC, Exhaust valve closes -1 ATDC = 6 degrees overlap

A good clue is that the intake valve should never close while the piston is still going down. With more boost the intake valve can stay open for a while with the piston going up letting in even more air. Boost is good.