Green fiat 128 1100 1976

[Agnelli]

That would do the job.

Having Abarth cast into it for sure will add 10hp at the wheels

DCNF/ DCNVA / DCNVH / DCA all share the same base pattern.

Not wanting to spoil Jim's sale of a pair of carbs, but I'll just say to may find it difficult to pair those two together with a balance linkage and tune them as dual carbs, they would work much better individually.

There's another guy in Croatia that also replicates various manifolds

FIAT 128 RALLY COUPE BERLINA ZASTAVA YUGO X1/9 BERTONE INLET...

This is new inlet manifold for FIAT SOHC engines 1,1-1,6 from: Fiat 128 Berlina, Special, Rally, Sport Coupe, Familiare 1,1-1,3 Fiat X1/9 Bertone 1,3-1,5 (produce with angle for X1/9) Fiat Ritmo/Strada/Regata 65, 75 1,3-1,5 Fiat Uno 1,3-1,5 Fiat Tipo/Tempra 1,4-1,6 Lancia Delta/Prisma 1,3-1,5...

stolesraceshop.com

or what may suit you better, a single DCNF pattern carb

FIAT 128 YUGO BERTONE ICSUNONOVE INLET MANIFOLD WEBER 36 40 42 44...

This is new inlet manifold for Fiat 128, YUGO, ZASTAVA 101-128 RITMO 65 75 1,3-1,5 for 1xWeber DCNF carburettor (produce with angle for 128). We can produce this manifold for Weber DCD carburettor.For this option please contact us. We accept PayPal or bank money transfer.

stolesraceshop.com

SteveC

I had a single DCNF 1500 in my 128SL coupe. That combination provided excellent flow and power.

 

[fiatfactory]

They can make very good power, and certainly have much more tuning potential than a 34DMTR.

Personally I like to combine them with the factory 4/2 cast iron exhaust manifold. t

The reason is the inlet has two runner lengths of 1/4 and 2/3 are paired, and it's the same with the exhaust. There is a variation of primary lengths from 1/4 and 2/3.

it gives a broader torque curve as the resonant lengths become tuned for two different (and compatible) tuned lengths between the paired cylinders, just as Aurelio intended.

SteveC

 

[T.G]

Today i finally had time to take the engine further apart and i was able to look at the pistons and the lightend and polisht rods
And i think they are in really good condition (they have been used for a few years of racing already) so of course they have a few light scratches
Here are some foto's for everyone thats intrested
Again this is the first time im taking a sohc fiat engine apart so any tips are welcome

 

[fiatfactory]

They are cast pistons, standard OE Mondial's. The gas ports have been added. The reason for them is to channel combustion pressure down into the space behind the top ring, which pushes the ring tighter to the bore to assist ring seal on the power stroke.

Same with the rods, stock but lightened OE forged steel rods, crank looks like a standard 1500 crank.

SteveC

 

[Lowtechprime]

Question for Steve!
"It's actually 1878.5cc of displacement at 87mm bore size, 116 cubic inches give or take"
Is combustion chamber volume included in displacement figures/calculations? From my cylinder head that adds an additional 130 c.c.'s.... (plus whatever the gasket adds) That puts my stroker motor at 2008.5 c.c.'s.. 2 litres now?!

 

[dllubin]

I thought displacement was the swept volume of the piston (piston area x stroke) so the head volume would not factor in.

 

[fiatfactory]

Question for Steve!
"It's actually 1878.5cc of displacement at 87mm bore size, 116 cubic inches give or take"
Is combustion chamber volume included in displacement figures/calculations? From my cylinder head that adds an additional 130 c.c.'s.... (plus whatever the gasket adds) That puts my stroker motor at 2008.5 c.c.'s.. 2 litres now?!

Nope. Don is correct, displacement is "swept volume" , so only bore x stroke.

Combustion chamber / gasket volumes figure in your compression ratio calculations

Do you have flow figures for the head?

Do you have piston dimensions for the crown shape / flycut volumes...

79mm of stroke, that's 3.110 inches, that's longer than a Z28 hi-po 302SBC (4" x 3") of the Camaro from the late 60's, which per cubic inch is the most powerful SBC made during the era, with factory output of over 1hp/ CID from the factory making around 375hp stock with 11:1 compression....

But you need to build one of those really well to see over 8k reliably, and it has the advantage of a much bigger bore to cram a much bigger 2.02" intake into, and a chevy head will outflow a Fiat SOHC head by quite a margin because of it's higher valve to bore ratio.

The SOHC Fiat is under-valved at 1600cc with a 40mm valve and 401cc per cylinder... and you've stroked it to 470cc per cylinder... I'll say the same to you as anyone else that's asked, the head flow capabilities wont be able to keep up to feed the engine enough air past 8k max... more likely 7k. Ask Ralf and Ulix how their 1880cc engines rev. Max head flow is limited to around 165cfm with the stock port configuration and a 40mm valve

Even with the Fiat DOHC's, the 1756 is 84mm bore and 79.2mm stroke, it has the benefit of a hemi headed crossflow and has a 42.4mm valve standard, I fit a 43.5 / 44 valve to those and I've never been (or seen anyone) able to get more than 9k reliably and the DOHC engine has the big advantage of being able to flow more air than the sohc head is capable of with the stock port configuration....

Sure in this day and age materials technology and very clever CFD will allow some engine combinations to rev and breathe at over 10k revs, but it comes down to what engine builders call MTBO (Mean Time Between Overhaul) and for those fancy V8's made from two Hayabusa engines MTBO is measured in hours, not 1000's of miles ... those screaming V8's in the Radical SR's have an MTBO of 40 hours....

SteveC

 

[Lowtechprime]

Just so you know, I'm not expecting to run my engine at 10,000 rpm... It's aspirational, a spec to strive for.. If built to endure 10,000, I can worry less going to 8,000.. I like to overbuild..
What do you mean by "stock port configuration...." Are you talking about just flow porting, or re-engineering to some new unusual geometry?

"Do you have piston dimensions for the crown shape / flycut volumes..."

It's funny that you ask, the pistons I got with my stroker parts have an overall shallow dish, they look low compression to me, I don't see how I'm going to get to 10.5:1 with these... I'm still a little murky on how to calculate it though.. I get confused in relation to the gasket volume, how will I know what it's thickness will be once squished?
Also, in relation to displacement, I understand that it's calculated that way but it's strange to me that chamber volume isn't included... If you view a cylinder as a closed space full of air, then the chamber definitely adds to that volume. It would be like calculating the volume of a room, but not including the last foot and a half to the ceiling? That doesn't make sense to me from a geometry stand point.. But then, I'm not an automotive engineer...

 

[fiatfactory]

Just so you know, I'm not expecting to run my engine at 10,000 rpm... It's aspirational, a spec to strive for.. If built to endure 10,000, I can worry less going to 8,000.. I like to overbuild..
What do you mean by "stock port configuration...." Are you talking about just flow porting, or re-engineering to some new unusual geometry?

re=engineering the head to alter the port angle. Italian tuners were doing this back in the 1970's.

in my sohc thread theres a chapter on stroker builds, have a look there for "salvatore's 1807 build"

"Do you have piston dimensions for the crown shape / flycut volumes..."

It's funny that you ask, the pistons I got with my stroker parts have an overall shallow dish, they look low compression to me, I don't see how I'm going to get to 10.5:1 with these...

and you lose most of your effective squish / quench by having a dish in the piston crown too

I'm still a little murky on how to calculate it though.. I get confused in relation to the gasket volume, how will I know what it's thickness will be once squished?

From previous experience.

It basically depends on the construction of the gasket, an MLS gasket doesn't compress at all, a regular composite gasket generally will crush about 0.2 - 0.25 mm, a polymer composite gasket (astadur) will generally compress about 0.05 to 0.10mm

Also, in relation to displacement, I understand that it's calculated that way but it's strange to me that chamber volume isn't included... If you view a cylinder as a closed space full of air, then the chamber definitely adds to that volume. It would be like calculating the volume of a room, but not including the last foot and a half to the ceiling? That doesn't make sense to me from a geometry stand point.. But then, I'm not an automotive engineer...

including the combustion chamber as capacity would be like calculating the volume of a room, and then including the empty roof space above the ceiling as being part of the room's volume.

SteveC

It's about displacement, the engine only displaces the volume of the bore / stroke as the piston moves from TDC to BDC, it does not displace the static volume in the head as it cycles

 

[T.G]

Hi everyone im sorry i cant update you about the fiat but thats because im busy with this thing ATM
Little backstory which i think you guys all will find intresting
We made a deal with a swedisch drift group to see who could make the best dry ground drifter for €1500 euros and that we would drive our cars to sweden and battle it out there and then drive back home 7-16 juli
We have bought a bmw e46 325i (2.5ltr 6cilinder with 192 hp
Compleetly gutted the back of the car out (sparewheel tub etc is cut out and thin plates are welded in)
Welded the diff did alot of maintance because we have to drive the cars really far (17 hours to only get there) and lowerd it on adjustable coilovers also a new clucht is going in this week ,shortshifter ,new racing steering wheel ,loud exhaust ofc and put some nice wheels on it
This all puts our budget to €20 left
So after sweden i will have time for the fiat again

 

[Lowtechprime]

Wow! Is Drifting still a thing? We used to laugh as the kids drifted around the race track, it's the slowest way around a circuit! Seriously though, it sounds like you're in for one hell of an adventure! Keep us posted on how it goes, that will be an interesting drive, going 17 hours cross country with a welded diff!

 

[T.G]

Wow! Is Drifting still a thing? We used to laugh as the kids drifted around the race track, it's the slowest way around a circuit! Seriously though, it sounds like you're in for one hell of an adventure! Keep us posted on how it goes, that will be an interesting drive, going 17 hours cross country with a welded diff!

Yes drifting is still a very big thing en even tho its the slowest around the track its hard to beat the amount of fun while driving a car sideways at big speeds
Yeah im pretty excited to go and the other car we are taking is a volvo 740 wich we are finishing a engine swap on now (super last moment but its gonna put out around 300hp now instead of 130 hp) last parts for that will come in friday so it will be an hell of a adventure for sure

 

[T.G]

Hi everyone i havent been here alot but hopefully next week i have the last parts for the fiat so it can go back to driving
Meanwhile i have been busy with the sweden trip of course and some other holidays with our ****ed cars and i now have bought a pretty big garage with 3 other friends and moved the fiat there etc so its finally nice dry and warm where its sitting and i have bought a mercedes w124 260e (2.6liter 6 cilinder) as my daily / daily drifter and did some work on that and now its sitting like this
Also i have bought a mini cooper 1.6 (140hp) for my gf so im doing a few things on that to
As i said i am probably gonna be posting here again next week since i should have the last parts then for the fiat and i want to get it driving so bad