2000 and 1800 crankshafts

[betalatino]

Hi, i´m rebuilding my 2000 engine, but i found that the crankshaft was machined to 0.762 mm by the previous owner, i have a 1800 USA crankshaft at standard measure, then i had the idea to exchange the crankshafts, it is posible to do that? this is my first engine rebuild and i know that the stroke is diferent on both engines(79.2 on 1800 and 90 for the 2000), I measured the conecting rods of both engines and seem to be the same, i put one 1800 piston + conectig rod + crankshaft on the 2000 engine and the high of the piston was the same! were is the PHISICAL diference between the engines?

Thank you for all your advises.

[A1.6HPE]

Hello Betalatino,
This sounds strange - are you absolutely sure that the crank is from an 1800? As the difference in stroke is 10mm the difference should be easily visible. Can you get the casting numbers from both cranks?
Perhaps the 1800 car had had a replacement engine at some time?

Leo

[Wallace]

The 2000 ones were always nitirde hardened - they have a sort-of bluish-black appearance to them. The 1800 one I came across once looked brown in comparison.

[betalatino]

Hi Guys, wallace is right my 2000 crankshaft looks little black, and the 1800 looks brown. I don`t know if the 1800 had an engine change previusly, but i think it is 1800 because on the engine compartment had a plate with reference to an 107 cubic inches engine and in the glove box had another, i got the castings numers that are:

1800:
crankshaft :FIAT 4238533
conecting rods:FIAT 4287879 v 18
engine number:828 A1 0405 0077152
head casting:4277590
block Number:828 AB 1A0 82317566
2000:
crankshaft :FIAT 4238531
conecting rods:FIAT 4287879 B8
engine number:828 A1 000 0059675
head casting:4372281
block Number:828 AB 1A0 82306858

So the diference in stroke is in the crankshaft?

[A1.6HPE]

Hello Betalatino,
I checked a 2000 crank and the number is 4370092 sorry that doesn't help much.
The difference is in the stroke so the 1800 crank in the 2000 block should result in the pistons not reaching the top of the cylinders. The 2000 engines have flat top pistons (apart from the cut-outs for the valves) whereas the 1800 haspistons with a slightly raised top. The raised top would be above the top of the cylinder so maybe you are seeing the top of the raised bit only reaching the level of the top of the cylinders instead of going beyond that??

Leo

[Will]

The differnce is in the cranks, the journal-journal offset between the big ends is 10mm greater on the 2L, but only shows up as 5mm off of the centerline. I think the rods are the same length, but have never had occasion to compare the two. If in fact the 2L uses a 5mm longer rod, then that would support your observation that the TDC height was the same, but you'd find your BDC height was 10mm lower.
Right?
-Will

[cthargiss]

From what I can tell, both of your engines are 1.8L. Engine # prefixes 828A1xxxxx corresponds to first series 1.8L engines with 8.9:1 compression and 110BHP.
Craig

[Tom McGaffigan]

The 2 liter crank has more stoke than the 1800 and the rods are longer too. The deck height on the block is also taller to accommodate the longer stroke. IE crank is longer at the rod journals, the rods are longer and the block is taller. :twisted:
Tom McGaffigan

[betalatino]

Well, thank you guys for all your advices and observations, unfortunately i can´t get all the past information of my two engines to know of what capacity they are, i can only use the information that came with both cars one of them never ran, the only visible diference i could see was the flat top of the pistons, the oposite location of the oil holes(in the balance weights) on the crankshaft, and the brown color on the 1800 compared to the taller pistons, black colored crank of what i called 2000.

Now what i´m going to do is to use the crankshaft machined to 0.752mm, but i have new questions, ¿Wich´s the max measure to machine my crankshaft? it is easy to get extra large engine bearings? it is safe to reduce too much the crank?

Again thank you very much.

Alfonso

[Will]

I don't know what the limits are, but I think they are something more like .010" where you'll start to run out of the hardened material and need to get the crank rehardened. Everybody says they are nitrided, but I think it's actiually phosphate hardened. You might find the cutting limits in one of the tech data manuals. What you are describing sounds like a lot to me.
Check the vendors for undersize (thicker) bearings before you commit.
-Will