CB99SS

I'm trying to figure out what brand cam and details of it that is currently installed in my 99 camaro. On the end it has the following.
RRS1-231-231 UA7D 112
241820 (Is engraved in it) The 0 may actually be an 8 or 9.

Thanks for the help.

G Atsma

If it's 231/231 with a 112LSA (jus' guessin'!), I bet it lopes a bit. Does it?

wannafbody

iTrader: (2)

I'm guessing a Comp Cam

CB99SS

Yes it lopes. But I got shafted because the motor is suppose to be for twin turbos.

Thanks for the help.

G Atsma

If the numbers I quoted above ARE the actual specs, then NO, that is not a turbo cam. Who sold it to you?

CB99SS

Broken944

What would make that not a turbo cam? I don't know if just the duration and LSA is enough to determine something like that.

Edit: with a little googling, the 'RRS1-231-231' looks to be in the same format as Lunati grind numbers found on Summit. I cant find that specific grind number anywhere. Custom grind maybe?

G Atsma

A turbo cam would have a wider LSA, like at 115 degrees. Too narrow an LSA keeps boost down by letting intake compression blow right out the exhaust with excess overlap.

Darth_V8r

iTrader: (4)

You typically see longer exhaust durations vs intake on turbo also because you get all those spent fumes out

G Atsma

Also true for PD blower cams, right? Same reason?

Broken944

Typically maybe, but I've seen plenty of turbo cams on 112s and with lower exhaust durations. It dependson what the motor needs. The LSA is just a number that comes from the valve events. With the info given we don't know the valve events. Just duration and LSA doesn't say enough in my opinion too say it's not a turbo cam. It might not be, but also it very well could be depending on the actual valve events.

Also, I'll throw it out there that longer exhaust durations might hurt spool times on a turbo. Hold that valve open to long and the exhaust gas velocity drops. I'd think you want to keep that exhaust gas hitting the turbo moving as fast as possible.