Tuning a 1300 engine?

[tmt]

Hi!
I´m slowly and quietly restoring my ´67 gt1300junior to be more or less original.
But if I want some more grunt, what do I do?
New cams? I don´t need a massive amount extra power, just some extra hp.
Any suggestions appreciated
Regards
Jan

[Gordon Raymond]

Easiest is a 1400 cc kit, porting the head with a set or Richard Jemison's (Alfar7 on the BB) cams he would have WebCam make up for you. You would likely end up with a little more power than the 1600, with a little less torque. A lightened flywheel will help. Contact Richard for more ideas. He will TRY to get you to install a 2L, but you will be able to convince him to help with the 1300.

[tmt]

Thanx, I will contact him.
Jan

[gigem75]

I put the 77mm pistons in my 1300 and it was the biggest bang for the buck on any motor I've ever built. At least I think they were 77, with stock being 74 and the extra 3mm taking it from 1290 cc to 1400. I highly recommend it and with some nice porting you should have one heck of a motor!

[tmt]

gigem75:
So you just put in 4 pistons?
That´s all? That sounds really cool and makes it more or less what I´d need.
Are they from a 1600?
Jan

[tmt]

OK, after some quick calculations you drill the block to 77 with the same stroke.
That seems a bit more radical than I thought.

Just putting in new cams don´t really do anything?
Jan

[Gordon Raymond]

With a 1300, 101 or 105, BREATHING IS EVERYTHING! Correct cams, (from Richard Jemison) matched to a porting job is where most of the top end HP live. A 1400 cc kit is nice, but IF you want a 1600, BUY one. Much cheaper. The same is true for a 1750, or 2L.
IF YOU WANT a 1300, the overbore MUST BE within the design limitations of the 1300 head combustion chamber, which is SMALLER than the 1600 or 1750. For example, a 1600 can use the 80 mm pistons of a 1750, but beyond that, the combustion chamber is too small unless considerable and expensive machine work is performed. Cheaper to use a 2L. The same is true for a 1300. A 2 mm overbore works fine, beyond that, you will begin to need machine shop work on the combustion chamber. These are the design limitations of these engines, UNLESS you are, or know a skilled machinist, who will work cheaply to re-engineer the design. It all depends on what you REALLY want to do, AND how much you are willing to spend. Boring liners is much easier with an Alfa than opening up the block for larger (and too tall!) liners. If you don't like the 1300, GET A BIGGER ENGINE!