Slightly tuned 2l Nord camshaft options? - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 13 (permalink) Old 09-15-2019, 02:20 PM Thread Starter
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Slightly tuned 2l Nord camshaft options?

Hello,
doing 2,0 Alfetta engine rebuild, Im considering some mild performance upgrades. My goal is street engine with only slightly improved performance lets say real 140-150hp on flywheel would be nice. I will use high compression pistons 10,4:1 and lighter conrods, lightened flywheel. But I need some help about the head. Im thinking about using some hotter cams, the options are Colombo Bariani and Dbilas (german company) cams. I have 4 options: 1)CB cam 280/10,9mm intake with standard euro cam exhaust. 2)CB cams 280/10,9mm both intake and exhaust, 3) Dbilas 292/11mm intake with st. Euro cam exhaust, 4) Dbilas 292/11mm both intake and exhaust. Any experience with setups like that? Should I also use some stiffer valve springs, or the stock ones should be OK? Thank you.
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post #2 of 13 (permalink) Old 09-15-2019, 02:39 PM
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You'll likely get camshaft recommendations from all corners of the Alfa world. Here's mine: Stock 2 liter Spica cam on the exhaust side. Centerline 11.1 mm cam on the intake. Both cams are timed at 102 degrees.

There's about a 32 degree timing difference between the two cams which gives plenty of torque, good gas mileage, and plenty of power. We tried this combination as an expedient on my newly built 2 liter while it awaits a newly ported cylinder head. We used performance valve springs (I think from Centerline). The combination turned out to be so good that I've put off building the new head . . .

Jim . . . '72 Super 1300, '70, 1750GTV, 2nd series,
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post #3 of 13 (permalink) Old 09-15-2019, 05:58 PM
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No benefit from heavy valve springs for fast street use. Just more stress on parts.
Good advise from 180out on cams.....

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post #4 of 13 (permalink) Old 09-16-2019, 07:19 AM
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Valve springs

New,stock type Alfa springs should not be used with any cam lift over 10.5mm lift. And used springs not even then.

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post #5 of 13 (permalink) Old 09-16-2019, 07:37 AM
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And a 2 liter with balanced bottom end, light flywheel, cams, and compression, etc. will easily hit 7k a lot easier and a lot faster than you might think. Performance valve springs are just part of the go-fast(er) kit: belt and suspenders.

Jim . . . '72 Super 1300, '70, 1750GTV, 2nd series,
'62, Lancia Flaminia Zagato3c, 2nd series
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post #6 of 13 (permalink) Old 09-16-2019, 10:50 AM
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Quote:
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New,stock type Alfa springs should not be used with any cam lift over 10.5mm lift. And used springs not even then.
Exactly. Coil bind isn't a funny one.

C&B's have lobes used in 1970. Couldn't recommend them at all.
DBilas is good for Opels/Vauxhalls, but not for Alfas.

Go for CatCams or Richard's cams.

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post #7 of 13 (permalink) Old 09-16-2019, 11:57 AM Thread Starter
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hunttheshunt: What exactly is wrong with Dbilas? CatCams are totaly out of my budget and Richard is in USA so the logistics would a bit more complicated.
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post #8 of 13 (permalink) Old 09-16-2019, 12:23 PM
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hunttheshunt: What exactly is wrong with Dbilas? CatCams are totaly out of my budget and Richard is in USA so the logistics would a bit more complicated.
CC are not much more expensive to dBilas.....and what is complicated in 2019 by shipping of 2 pieces of steel??!

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post #9 of 13 (permalink) Old 09-16-2019, 01:24 PM Thread Starter
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sorry, my fault, I was working with bad product number - the price is similar...
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post #10 of 13 (permalink) Old 09-16-2019, 11:31 PM
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I got Richards cams faster overhere than Catcams sends them off...
no problem with logistics on that.
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post #11 of 13 (permalink) Old 09-19-2019, 05:20 PM
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Quote:
Originally Posted by 180OUT View Post
You'll likely get camshaft recommendations from all corners of the Alfa world. Here's mine: Stock 2 liter Spica cam on the exhaust side. Centerline 11.1 mm cam on the intake. Both cams are timed at 102 degrees.

There's about a 32 degree timing difference between the two cams which gives plenty of torque, good gas mileage, and plenty of power. We tried this combination as an expedient on my newly built 2 liter while it awaits a newly ported cylinder head. We used performance valve springs (I think from Centerline). The combination turned out to be so good that I've put off building the new head . . .
That's exactly what I have. Very nice. I thought of playing with the cam timing but I will probably just leave it.

I live at 5400 foot elevation also.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
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post #12 of 13 (permalink) Old 09-20-2019, 05:53 AM Thread Starter
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180OUT and slowcreek: do you have some estimation about the crank hp?
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post #13 of 13 (permalink) Old 09-20-2019, 05:56 AM
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180OUT and slowcreek: do you have some estimation about the crank hp?
I don't, but at some point down the line will have WHP figures.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
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