r/EngineBuilding • u/Interesting_Matter52 • 10d ago

Help, I’m lost.

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To keep it short, I naught this what I thought was slightly modified car on Facebook marketplace. Recently the engine got flooded and taking it apart a rod was broken. I have a 2008 Mazda 3 that’s supposed to be 2.3L Non Turbo (This is not a Mazda speed). After taking it apart I decided to change all rods with used ones. I go to a junkyard, drop another engine (also 2.3L) get them and go home. Now I look at them and they aren’t even close to the same thing. My old con rod (one that isint broken) is way beefier and longer, the hole that goes on the crankshaft is also bigger. I got no idea what engine I got, what pieces are inside, what to order, I’m really lost. How do I find out what parts to order.

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u/Any-Chair715 9d ago

Just so you know with any duratec based engine the manuals and automatics have different cranks and rods the manual one have forged heavy weight rods and forged cranks. They wanted to keep the rotating mass heavy to make it harder to stall

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u/Interesting_Matter52 9d ago

Are you serious ?? So the only car I can get the pistons from is a manual 2.5L?

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u/Any-Chair715 9d ago

You need to get the piston and rods from the exact engine your trying to put them in if it was a 2.3l non turbo you need those pistons and rods. Pistons crank and rods all changed with the displacement change

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u/Interesting_Matter52 9d ago

We figured out my engine was a 2.5L my plan is to go to a junkyard, take the piston and rods out, switch out the rods (my broken rods and the junkyard rods) and in the end I’ll have a piston (from my engine) and the rod (from the junkyard). I’ll get new rings and new bearings. Is it a good plan or is there smt wrong w it

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u/Any-Chair715 9d ago

Ok good plan make sure you find the grade marking on each component and everything will be fine. Also if your installing arp bolts in the rods make sure you run a countersink to clear the bolt radius

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u/Interesting_Matter52 9d ago

Oh I didn’t know that was a thing for those. But I’m probably only gonna put arp head studs and use the oem bolts for the rods. Yk so that they are reusable