adrynalinjunkie

iTrader: (4)

I recently bought a 01' Z-28 with a Futral Motorsports

FMS-F14-114 FMS Custom Grind Camshaft - 232"/234" .598"/.598" 114LSA - aggressive profile with a 2600-7000 RPM range, rough idle

Am I just thinking "old tech" SBC or is this cam way to big for the stock power brakes?

matrik

iTrader: (5)

What do you mean too big? Your brakes won't stop the car? They won't hold when you foot brake at the track? I have an F13 and have no idea what you are talking about. Brakes work just fine for all of the above.

00MaroonZ28

iTrader: (3)

um, yeah. Brake upgrades are always good, but it's not like the brakes aren't gonna stop the car anymore. Plus, you'll still be able to foot brake it.

LS1MCSS

iTrader: (18)

My cam is a little bigger than your and I had to add a seperate vacuum reservoir so the brakes would work good everytime. You might want to try that. Here is what I have.

http://www.summitracing.com/parts/CCA-5200/

Joshiedoom

iTrader: (4)

Large Cams=Poor vacuum=Power Brake issues.

Power brakes run off the engines vacuum.

adrynalinjunkie

iTrader: (4)

Thanks for clarifying that!

Yea, guys I have a similar size cam in my SBC Chevelle and you would NEVER be able to run power (engine vacuum power, ie..stock) brakes with that cam in a Small block Chevy motor

KCFormula

iTrader: (4)

There is no way that cam is too big. You need a new tune if it won't hold vacuum. My cam is a LOT bigger than that cam and I still run stock brakes.

OutToWinPAHC

iTrader: (10)

I use a texas MS3 cam in my 5.7. When I went from 4 pistons to 12 piston the brakes hardly worked. I tried a vacuum no which helped minimally. Ended up going with electric vacuum. But this is in a 240sx, stock single piston brakes still worked just dandy

MadMike 97 Z28

iTrader: (3)

I was always under the impression that overlap is what kills vacuum. with a 114 LSA I would think thats not a big issue. I ran the GM847 cam on my LT1 and had no issue with power brakes and its slightly larger than your listed specs.

GM847 --- 234@ .593/ 242@ .614 (1.6RR)--- 112 LSA

1999 SS

iTrader: (3)

i have this exact cam in my car for three years and i do not have any problems with my brakes at all.

bww3588

iTrader: (49)

i have an MS4, with 9 inHg at idle and my brakes work fine.

JakeFusion

iTrader: (7)

You can't tune out the lack of vacuum from too much overlap... you can tune drivability and idle issues out, to a point, however.

With that said, you can run a pretty aggressive hydraulic cam in an LSx series motor, because of the 55mm cam core. A larger core allows for ramp rates that are so much faster and more aggressive than what you see in the SBC world that the cams are actually shaped much more "peaky." That is, it is much smaller right off the valve seat, but ramps up to a very high lift and duration .050" and .200" off the valve compared to the SBC cams, giving you a little bit better idle and more vacuum compared to SBC cams similar in size at .050". That's why it's dangerous to read too much into the .050" duration and lift numbers.

Also, most shelft stock SBC cams are usually sold with a tighter LSA (because of the intake manifold design), jacking the overlap even higher versus the wider LSA you see in a majority of off-the-shelf LSx-series cams of comprable size, reducing the overlap somewhat. LSx guys run typically 111-114 LSA for cams sized between 224 and 240 for the intake duration at .050", where you'd see 106-110 LSAs for the SBC guys with similar sized cams.

The F14, with a good tune, would work well with the LS1. The F13 is also a terrific performer that produces a ton of usable power and torque without having to spin the motor to the moon.