alfa 2300 rio fnm piston

[franco-veloce]

Hi All,

I am searching for alfa 2300 RIO fnm piston 88mm compression and oil scraper rings

I am also searching for cilinderhead gasket



rgds Franco

[franco-veloce]

FYI

the upper compression rings are the same as from 2.5 V6 88mm

but oil rings are not...............

rgds Franco

[charley]

Have you tried here for rio spares...

Pecas alfa romeo 2300 em MercadoLivre Brasil - Onde comprar e vender de Tudo.

[franco-veloce]

Hi All,

I am still searching.............

and not found these rings or substitute

I am also searching for cilinderhead gasket

rgds Franco

[DPeterson3]

Franco,

You can send the dimensions to JE pistons. They should be able to match up something for you.

Dichtengen Schwarz in Germany offers an FNM2300 cylinder head gasket. It is of very good construction, except their design is incorrect. They used the shape of a 2000 and simply made the cylinder bores larger. This means there is very little overlap at the front between the water jacket and the timing chain opening, and it could blow out at some point. They said they would make a correct gasket if someone provided them an old one to copy.

I have gotten some gaskets from Brazil, but these are of poor quality. They blow out fairly quickly and with very few miles they show significant deterioration of the material.

I suggest you try DS and send them an old gasket to copy. Then they would have a correct pattern we could all use.

[Redmerlin]

Shop High Performance Piston Rings Online - Deves.com

[franco-veloce]

Hi does someone have experience with pistons from :

CPS S.N.C -
Via Torino 126 -10073 CIRIE'- TORINO- ITALY

rgds Franco

[franco-veloce]

Hi Don,and All,

FYI

I am building a new engine for my 1900CSS and I am thinking to put the 2300 rio cranck (with higher lift )and 88mm rio pistons in the "old" 1900 iron cast

so I have a 2315cc engine with "old" 1900 cast iron "looks"

with HOT cams and 44 or 45 carbs (weber/dellorto IDF/DRLA ) and new electronic ignition we will get about 160-175 PS out of this .........

rgds Franco

[DPeterson3]

I have doubts that there is sufficient cylinder wall thickness to bore to 88mm. Plus, you will want to carefully check that the connecting rods will clear the lower cylinder skirt.

Good luck

[2000 touring sp]

Franco Velose.
I used CPS pistons when i renovated 2 years ago, no concern so far.
Chris did also use CPS.
Once i made a tread with pictures of the pistons. Chris did also described his experience

[franco-veloce]

Hi don,

I am going to use the "WET " liners from rio and not bore the original cilinder to 88mm because the thickness of original cast is not enough

rgds Franco

[DPeterson3]

Franco,

That strikes me as being well beyond bold, not to say very expensive. To bore away the existing cylinders, prepare the inner block, and get all of the dimensions correct is likely to be many thousands of dollars, and one mistake and a 1900 block is finished. It also seems likely that the design of the 2300 crankcase was strengthened to support the head bolts, whereas the solid upper surface of the 2000 block, being a single piece, is inherently stronger.

Why not just bore out the 1900 block to an acceptable maximum, perhaps 85.5 or 86 mm and make life a lot easier? The difference in horsepower won't be significant.

Good luck!

[franco-veloce]

Hi Don,

I want to bore to +/- 95 mm and put the 88m (inside and 95 outside dia) liners in the 1900 cast and used the solid upper surface of the 2000 block and solid cast , being a single piece

rgds Franco

[DPeterson3]

Franco,

I suspect you will find it is not that simple. The outer diameter of the FNM cylinders is so big that you will have to remove the entire upper surface of the block, so that it looks like an FNM block. The 2000 has steel that bridges from left to right, and this gives the entire block strength. When this steel is removed I believe you will find there is not enough strength left in the block due to the wall thickness of the block not being thick enough.

The inside of the FNM block was designed to allow the necessary water flow, plus the bottom of the block was machined and strong enough to seat the cylinders. You may have to do some rather complicated machining down inside the block to duplicate the FNM characteristics.

That's OK with me. I look forward to the results. I would think sticking with slightly over sized pistons - say 85 or so, would give you all the horsepower you need in an antique car without requiring all that machine work. Since the crankshaft has a longer stroke, the piston crown can be much lower and still give you a nice compression increase with improved flame propagation.

If you go in that direction, you might consider working with a group we found over here that has prepared a design for a longer connecting rod and smaller piston pin, thus moving the pin up in the piston. This improves the mass distribution and rod angle, while lowering the overall moving mass.

Good luck!

[Felipepat]

Quote:

Originally Posted by franco-veloce Hi All, I am searching for alfa 2300 RIO fnm piston 88mm compression and oil scraper rings I am also searching for cilinderhead gasket rgds Franco