: Northstar V. 4.9



I~LUV~Caddys8792
12-05-05, 07:39 PM
Alright So I know the N* is much more advanced and more powerful, but which is more reliable and easier to work on?

4.9 Port Fuel Injection V8

Pros
+ great low end torque
+ good power
+ fairly simple design
+ block is aluminum, so its still pretty light
+ lighter that N*?
+ less parts to break down
+ Cadillac exclusive

Cons
- prone to coolant leaks
- cooling system is high maintenance (yearly coolant changes a must)
- old tech compared to N* (but that may be also a good thing)
- Aluminum block/ Cast Iron heads (what were they thinking?)
- Hard to work on & access
- main bearing thump


Northstar 32 Valve V8

Pros
+ Very mechanically advanced
+ wider powerband than 4.9
+ "high performance motor" (needs to be driven hard)
+ more powerful than 4.9 (more top end power, less low end torque)
+ has been around for a longer time than 4.9
+ Cadillac "exclusive" (before the Bonneville GXP)
+ better mileage than 4.9
+ Limp Home Mode
+ Flagship motor for GM
+ seems easier to work on & better accessibilty

Cons
- more parts to break
- use oil (what exactly does that mean)
- head gasket problems (owner neglect?)
- head gasket bolt threads (something like that, I forget exactly what problem is)


I know I'm only hitting the tip of the iceberg, what else is there?

keep it fresh
12-05-05, 08:22 PM
4.9

-oil rings tend to go bad
- when engine gets old sounds rough

4.6

-sensors are a bitch

well a car is wat u make it how u take care of it that is wat u will get maintain it it will last long

I~LUV~Caddys8792
12-05-05, 08:30 PM
Which sensors? O2 Sensors?

keep it fresh
12-05-05, 09:28 PM
O2 And Oil Sensors It Depdends On Engine Cleaning

Ranger
12-05-05, 11:05 PM
Oil usage is not really a con. Go to the Technical Archive, top left of this page and read up on it. Once you understand it, you won;t worry about it or consider it a bad thing.