328 Valve Timing - Technical Specifications

If you read the chart on the right it says the 50 degree spec is for the US version. Slightly different timing specs for a US car were quite common up to the 355.

It is important to adhere to those specs on any car that has cats or slow down lights (cats overheating) and ck engine lights (for cars that have them) will be a problem.

There is no change in the location of cam timing marks on the US vs the non US cars.

Almost everyone here says you can eyeball that, good luck.

 

those are the degress by which you can alter and set up your cams to match the specs provided. 911tr has a great spread sheet that lists the varaitions

 

Nothing. They are wrong. That book was concieved and produced here and someone transcribed the numbers wrong. It is a very common problem with Ferrari technical information. So many of the specs and information are just plain wrong you need to be very careful in using it.

There are published torq specs that will break fasteners or just rip them out of the aluminum.

Heaven help you if you ever need a 550 wiring diagram. The idiot that did those should be killed. Great part is Ferrari knows how bad that stuff is and does very little to correct it.

 

No 50+10 are not possible. It is just incorrect information.

 

Just to be clear, from all my parts books I can only find one set of cams produced for the 328 which was SOP for that time period.
The exhaust cams were timed differently from the USA to the base model which was also SOP for that period.
That was to prevent the cats from overheating with the longer overlap period in the base model timing scheme.

The base model has a timing period of 54 degrees bbdc to 10 degrees atdc.

The same cam is timed in the USA model at 50 degrees bbdc to 14 degrees atdc.

The total is the same. A timing spec of 50-10 with the same cam is not possible.

 

Good one.

Also I just noticed that I was just transcribing numbers and not really bothering to read them. Logic suggests the last numbers you give would be correct due to the fact that the 10 degree ex closing time gives the least overlap.

During that time period I spent most of the time on 12 cyl cars so I cannot say off the top of my head but tomorrow I can call someone who was one of the FNA tech people then and see what he has to say.

Now you begin to see what we deal with every day.

 

box, upper right corner of pic 1. that is what i thought he was asking about, those schematics tell you how the pin is placed in relationship to the cam and pulley, i.e. a 3* seperation and the teeth have a 12* seperation. given that you can set your cam timing how you need it. i'm not sure where you get the 50+10??

 

Sorry I thought you were referring to the opening and closing times.

 

When you say how do you know what you have, it is a simple matter of determining if it is a US model or a Base model.

I got in touch today with my old contact from FNA in those years. He said they were aware that those specs were printed in error in so many of the manuals that they researched it and found that the WSM is wrong and the majority (but not all) of the owners manuals are correct. The US ex timing should be open 54 degrees bbdc and close at 10 degrees atdc.

That all came from his contemporaneous notes.

 

that's okay, is thw WSM for the 308's also incorrect?