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Author Topic: Different sizes on 1.8t connecting rods?  (Read 5783 times)
Terror_Flynn
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« on: May 03, 2023, 01:29:37 AM »

Hi

What are the different sizes on 1.8t connecting rods and which enginecodes uses which?

I know about the small end diameter difference, 20mm vs 19mm 

But what about the width of the connecting rods?
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
fknbrkn
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mk4 1.8T AUM


« Reply #1 on: May 03, 2023, 01:42:42 AM »

Width?
Theyre same except of piston pin size that you mentioned
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Terror_Flynn
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« Reply #2 on: May 03, 2023, 01:53:17 AM »

Are you really sure?
I'm a bit confused about the width.

Some H-beam measures 24.95mm in width, with 20mm piston pin.

And others just 19.95 in width. And tapered 19mm pin.
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
BlackT
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« Reply #3 on: May 03, 2023, 02:30:48 AM »

Yes you are right but I dont know why is that. Don't buy those
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Terror_Flynn
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« Reply #4 on: May 03, 2023, 02:37:48 AM »

Ah, so it is a manufacturing mistake, got it.
Sadly I have already bought those H-beam rods.
So the rods are totally useless scrapmetal.

Can those rods fit some other VAG engine?
Maybe 1.4 TSI engine?
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aef
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« Reply #5 on: May 04, 2023, 11:15:22 PM »

Interesting question
i made this mistake once but i didnt understand which engine does have the smaller width and why
I dont see why the whole rod needs to be less width only because the piston/small end is smaller in width

https://www.aliexpress.us/item/3256805058762926.html
Center to center length: 144mm/5.67"
Big end diameter: 50.6mm/1.992"
Small end diameter: 19mm /0.748"( tapered small end)
Big end width: 19.9mm /0.784"
Small end width: 19.9mm/0.784"


https://www.aliexpress.com/i/3256802968790662.html
Center to center length: 144mm/≈5.66929 in.
Big end diameter: 50.6mm/≈1.99212 in.
Small end diameter: 20mm/≈0.7874 in.
Big end width: 24.9mm/≈0.98032 in.
Small end width: 24.9mm/≈0.98032 in.
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Terror_Flynn
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« Reply #6 on: May 04, 2023, 11:33:06 PM »

Sadly I think quite a lot of people over the years have bought those H-beam rods.

Hopefully they notice the size difference fast, and they got their money back.
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Terror_Flynn
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« Reply #7 on: May 06, 2023, 02:35:37 PM »

Difficult to source H-beam rods with tapered 19mm small end and 24.95 width.
I can only find those rods with wrong width measurements.

Correct rods but with 20mm small end is easy to get.
But I need to get new pistons with 20mm piston pins.
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
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