Cam timing

[ZanettiZA]

Actually you do have a point there, it very well might have been rebored, never thought of that... Will have a look and see...

[Ralph deMasi]

In having the block bored the talent of the machinist will be determine if you get back a renewed part of your engine or an expensive piece of high-nickle iron junk. I would tell you how I know that but I'm just getting over the anger. Huib should be able to tell you the degrees of the V since the machinist will need to know that or at least be AWARE of that before he puts cutter to metal.

Huib,

The 1.2 HF, is that "JUST" a 1.2 block with the larger valve cylinder head and more radical camshafts?

And are you suggesting there is enough material on a 130 block to bore it out to 1.3 pistons? Will the difference in V-angles matter in the performance?

[Huib]

As far as I know the 1.2HF block is just a 1216cc block but you can check the parts book.

The V angles of the 1300's and the 1200's are the same.

So far I have always found there was enough room on 1216cc as well as 1231cc blocks to bore to 1300 std. I wasn't responsible for the manufacturing of the blocks so I cannot guarantee it is the case on ALL blocks.

It is indeed important to make sure the machinist understands the V angle and is capable of doing a good job. I use in fact different companies for various engine parts. The one that bores and hones my blocks to perfection fails to do a head properly and vice versa. The equipment these companies have is all the same but it is the person that counts. I always put copies of the relevant pages of the Data Tecnici with the parts.

[Huib]

Lucas sent me an email pointing out that according to La Lancia by Wim Oude Weernink there is a difference in V angle between 1216 cc and smaller engines and 1231 / 1298 cc engines.
Up through 1216 cc : 12o 53' 28''
1231 / 1298 cc : 12o 45' 28''
1584 cc : 1584 11o 20' 00''

DT Fulv. 01/590 1/5 and 3/5 list 6o 26' 44'' plus or minus 3' for the half angle for all engines up to and including 1298 cc. (Thus 12 o 53' 28'' plus or minus 6'.)

[racing]

What does it mean.

The different we are taking about for the 1200/1300 are 8 minutes.


regards
Andreas

[Huib]

I can't say what it means. Personally I would not worry.

[racing]

me too

[Ralph deMasi]

Yes, I have that book and noticed the difference in angles, which is why I asked.

I'm sure the difference made sense on someone's slide ruler at Lancia.

[racing]

If someone used new pisten and regrind the zylinder block i am sure the most are out of
the angle tolerance. But without any problem if the rest is ok.

For me it is a calculated angle to fix the right ignition point. If you use the correkt combination of
the crank with the right cam timing and correkt distributor nothing should happend.( my opinon )

regards Andreas

[VAR1016]

Curious though that the 818302/3 engines used the Vee-angle of the 1216 engines, whilst the 1300HF used the 1231 angle!

Paul