Anyone Here Actually Own a 348 GTB/GTS

Makes you wonder if these were the original cams with the timing retarded further* for more power at higher revs...

*I've always assumed the catalyst and non-catalyst cams were the same, with the later cars getting different timing to help peak power numbers... but I guess assuming is a bad idea, especially when it comes to the Italians.

 

As far as I know the lift and duration are the same on "all" the cams. I haven't ever heard any different. The only difference is the timing and ecu mapping. Retarding the cams makes sence because the torque drops off a cliff at 6000rpm on my engine. So it may shift peak torque to 6200-6400rpm +/-, and move peak HP up to 7100-7400rpm. Our poor f119s are choked soooooo bad. Tiny intake valves, tiny throttle bodies, low lift/duration cams, tiny intake plenum size and runners, small injectors, and low revs. Give them the proper breathing, fuel, engine management, and revs will make them 400hp+ engines all day long.

 

Sure, but you could apply that to anything really.

Everything is choked until it reaches F1 levels of specific output

 

Go to know. Thanks. I'd still like to see part numbers for the GTB/GTS cams but I've never seen a parts book for those models. I think it's a good assumption that the cams are the same and the timing was changed as a result of the altered intake and the higher rev limit.

Does anyone know where the rev limiter is set on the GTB/GTS and if there were any internal changes to support the rev limit? The crank, rod, and valve springs seem to remain the same for US cars so I wonder if anything internal other than the compression ratio was changed.

Side note, since we're already way off-topic-- I checked the valve spring part numbers on Ricambi's site to see if they show any supercessions. The inner spring is listed at $80.72 and the outer spring is listed at a mere $36.93. So Ricambi's list on one set of springs is $117.65, meaning that if you wanted to replace the valve springs in your 32 valve V8 you'd be looking at a retail total of $3764.80. It's a good thing F119s aren't known for breaking valve springs...

 

F1 engines are choked too... if you want to rev them to 20k RPM.

 

Lmao, true!