Northstar Engines and System Technical Discussion Discussion, y VS 9 ENGINE??? in Cadillac Engine Discussion; Can someone please explain the difference between the Y and the 9 engine. I'm sure I read here there was, ...
Can someone please explain the difference between the Y and the 9 engine. I'm sure I read here there was, but can't remember. My VIN tells me I have a 9, based on 8th figure of the VIN, right?
Cam timing is the reason for the power difference. The intake cams are the only difference between the LD8 and the L37 engines from 1993-1999. On the 2000 and later engines both the intake and exhaust cams are different.
I might add that the final drive gear ratio is taller in the sls and shorter in the sts. My 95 sls is better in roll on races than in stop and go. My wife loves her new Accord EX Coupe. Quick off the line! Caddy wins the roll on....Love ya Gal! Never race yer WIFE!!!...LOL
There are some differences in the horsepower rating procedures that went into place. The SAE standards for testing "advertised power" are changing to commonize certain features, eliminate ambiguities in test setup, etcetera. That results in lower advertised power numbers in most cases. For instance, the engine has to be tested now with the complete accessory drive system in place where as before it was not and the power for the generator, etcetera was mathemitically corrected. The engine makes the same power as it always did. It's just the rating system being phased in. It's only "lesser" on paper...