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  Topic Review (Newest First)
03-03-2019 07:28 AM
conedriver ...oops, forgot a page...Now, back to the regularly scheduled programming
03-03-2019 07:22 AM
conedriver OK. It's a thread highjack, but here goes:

The U.S. Alfa club tech series for SPICA is a 170 page compilation of all of the newsletter articles from 1969 to 1993 as well as the factory SPICA manual, but is no longer available. Obviously I don't want to scan everything, but here are the pages for filters beyond what appears in my post #102.

Quote:
Originally Posted by Ranz View Post
Conedriver... your post #102 comparative table...fascinating, and eyebrow-raising for many, I'm sure.

I read the notes at the end of the page.....and I'm hooked, I'd like to see is the next page or pages which would appear to offer sage advice on filters....and maybe more besides.
If you have more, I'd like to see it, and I suspect others would too.
03-02-2019 07:53 PM
alfaparticle
Quote:
Thats good to know Ed. and how do they compare the stock two piece manifolds?
Probably not much difference. The longer primaries in the headers should help high rpm power compared with the stock 2 piece manifold. The stock manifold will probably be quieter.
03-02-2019 03:38 PM
Ranz Conedriver... your post #102 comparative table...fascinating, and eyebrow-raising for many, I'm sure.

I read the notes at the end of the page.....and I'm hooked, I'd like to see is the next page or pages which would appear to offer sage advice on filters....and maybe more besides.
If you have more, I'd like to see it, and I suspect others would too.
03-02-2019 02:55 PM
Maine57S1
Quote:
Originally Posted by alfaparticle View Post
I have a set of original Shankle headers that are over 20 years old and have done 100k miles and despite the claims in the Ebay ad, they have not rusted. Mine are well made and I would recommend them. The 10 HP gain is compared to a stock one piece manifold.
Thats good to know Ed. and how do they compare the stock two piece manifolds?
03-02-2019 02:13 PM
alfaparticle I have a set of original Shankle headers that are over 20 years old and have done 100k miles and despite the claims in the Ebay ad, they have not rusted. Mine are well made and I would recommend them. The 10 HP gain is compared to a stock one piece manifold.
03-01-2019 07:42 PM
Maine57S1
Thai Made Shankle?

Anyone ordered these?

https://www.ebay.com/itm/Alfa-Romeo-...SfEz:rk:1:pf:0
03-01-2019 06:23 PM
tremere613 Just as a side note for the original question regarding engine note.

I finally broke in my new borla muffler and the car sounds a lot better! Especially in 3rd gear!

I highly recommend people allow 300-500 break in miles on a new muffler before making any decisions regarding further modifications.
02-26-2019 08:19 AM
Alleggerita Got it. This is likely attributable to their construction being sand bent tubing then ...

[quote=180OUT;8380744]
Quote:

I measured the .o.d. of the primaries about 5in down from the curve. I'll be happy to do some more measuring if you want.
02-26-2019 07:54 AM
VabeneGTV Talking about primary tube diameters, look at Giulietta Veloce headers, they are absolutely tiny, does smaller diameter add a performance gain in 1300 cc engines. Most suppliers claim their headers fit, 1300, 1600 1750 and 2000cc engines, and no doubt they fit, but is a larger bore primary overkill on a small displacement engine? I know in race engines a smaller engine might benefit from bigger diameter primaries, I suspect, at least at the time Alfa knew what they were doing with veloce headers. Just wondering.
02-26-2019 06:40 AM
Subtle Davebert
I overlooked mentioning the Spal puller fans with the paddle blade.
02-26-2019 06:16 AM
alfaparticle Mechanical fans move little air when you need them most - when the motor is turning slowly. They move lots of air when the motor is turning fast but then you normally have high air speed. A good electric fan will move lots of air when the car is stuck in hot traffic and it will turn off when you are moving quickly and when you can the extra HP.
It should surprise no one that modern cars use electric fans.
02-26-2019 02:53 AM
davbert
Quote:
Originally Posted by Subtle View Post
This "old" 1960s guy is with you.
But in a 101 Spider the mechanical fan robbed HP and worse--was noisy.
Unless you have a show car, get rid of them.
The aluminium ones look good, mount one on the wall of your shop, or den.
removing the fan might be ok in balmy BC summers but not so well in socal 405 traffic jam...

ive notice just removing the fan shroud will affect the cooling in rush hour traffic on a mod motor with more heat generated.

what next? electric water pump and axle driven alternator so it can read higher on dyno? lol
02-25-2019 11:17 PM
180OUT [quote]
Quote:
I have twos sets not mounted on the car and another one mounted that I can't measure. To me it looks like the inside diameter of the tubing is about 38mm. However, there is some crude porting done that is very visible on my NOS set ... and indeed 1 and 2 have the 40mm dimension top to bottom on both sets. the side to side dimension on the used set is consistently 38mm and varies from 37 to 38mm on the other set. My money is that the apparently different size primaries are attributable to the porting of the flanges rather than due to differnt pipe diameters.
I measured the .o.d. of the primaries about 5in down from the curve. I'll be happy to do some more measuring if you want. BTW: I imported these headers about '73 or '74. The guy I bought them from was pretty well connected with Alfa so I think he maybe was buying direct, although at the time Alfa stil had stocking part numbers for the headers along with most other GTA and even TI Super specific stufff that could just be ordered at any dealer.

Quote:
IMO 38mm works better on the street than 40mm or above and it may significantly lower the rpm when max torque comes in.

Re: some of the comments on drivability ... putting 1600 GTA headers with a 2 1/4" GTA exhaust on an otherwise very stock Giulia Super made a huge difference in bottom-end torque and drivability ... right up there with with close ratio box, lightweight flywheel and good shocks
Coming from someone who won his class in a TI Super against some respectablly fast competition in the '08 Carrera, I'd say this is a pretty solid observation. Your secret sauce works.

Sadly the GTA headers require some modification to fit a 2 liter Alfa motor. Nonetheless, they are such a good design that I've wondered why none of the vendors haven't convinced their supplier to make authentic vintage-style GTA headers that will fit a 2 liter's taller block. I bought the Alfaholics exhaust for my Super because it was stainless and the headers were GTA style and the exhaust dia was 2 1/4" or 2 1/2". I'm very happy with the way it works with my version of John Trevey's "in the style of" version of your Rally motor.
02-25-2019 08:39 PM
Alleggerita Hi Jim,

Have you measured top to bottom or side to side?

I have twos sets not mounted on the car and another one mounted that I can't measure. To me it looks like the inside diameter of the tubing is about 38mm. However, there is some crude porting done that is very visible on my NOS set ... and indeed 1 and 2 have the 40mm dimension top to bottom on both sets. the side to side dimension on the used set is consistently 38mm and varies from 37 to 38mm on the other set. My money is that the apparently different size primaries are attributable to the porting of the flanges rather than due to differnt pipe diameters.

IMO 38mm works better on the street than 40mm or above and it may significantly lower the rpm when max torque comes in.

Re: some of the comments on drivability ... putting 1600 GTA headers with a 2 1/4" GTA exhaust on an otherwise very stock Giulia Super made a huge difference in bottom-end torque and drivability ... right up there with with close ratio box, lightweight flywheel and good shocks ...

Shankle/Centerline headers (38mm) - not the replica GTA type which is 40mm - work great on a 2-liter, especially when combined with an improved merge collector and a good exhaust with 2 1/4 or 2 1/2 diameter. However a ready made Alfaholics set-up may be a lot easier ...

Quote:
Originally Posted by 180OUT View Post
Here are the primary diameters of my GTA headers. This might explain why Classic Alfa offered "big tube" 40mm headers (presumably from CSC). When I get a chance I'll measure my Alfaholics headers for comparison.

#1 40.08 mm
#2 40.11 mm
#3 37.00 mm
#4 37.00 mm
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