Engine weight - Alfa Romeo Forum
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(Post Link) post #1 of 12 Old 17-11-09 Thread Starter
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Engine weight

Recently, I went into discussion (actually I tried to give an advice) claiming that V6 and 2.4 JTD engine in the 156 are the heaviest engines you can find in 156s engine range.

I was corrected that V6 is the lightest engine of them all - it doesnt seem very logical to me - I mean, apart from JTD, is it really possible that 2.5 v6 is lighter that TS engines in the 156?

So, if anyone has any data on the engine weights in 156 (any other model would be interesting too), maybe he could post it here. Im really curious.
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There is no way the V6 is lighter than the Twinnie. The JTD will weigh the most though.

156 Twinnie curb weight, 1250 Kg, V6 1320 Kg, JTD 1350 kg. Not engine weights I know but a good guide.
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good enough. thanks
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The bare V6 block is possibly lighter than a twinny's, but you have to factor in the extra metal inside it, more metal on the crank, more pistons and con rods.

Then there is the fact it has two cylinder heads, 4 cams etc...
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I read somwehere that the V6 isn't much heavier than a twinny though, only a few kilos due to it's all alloy construction, i'll try dig out the article I was reading on it.
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Alfa V6 from 2,5 to 3,2l is 170kg (375lbs) dry weight without auxiliaries. Basically just engine block including heads with everything inside.

No idea about TS, but it will be probably slightly heavier, probably 175 to 190 kg my guess.

But if you consider the complete engine bay with everything in it, the V6 will be of course much more heavier.
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Info from EPER (version 5.8.0) for short engines (no ancillaries attached)

2.4JTD 10V (M30) = 138000

2.4JTD 20V (M20) = 136000

2.5 V6 (M15) = 135000

2.5 V6 GTA (M20) = 133001

2.0 TS (M10 & 11) = 115000
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Quote:
Originally Posted by cannonballuk View Post
Info from EPER (version 5.8.0) for short engines (no ancillaries attached)

2.4JTD 10V (M30) = 138000

2.4JTD 20V (M20) = 136000

2.5 V6 (M15) = 135000

2.5 V6 GTA (M20) = 133001

2.0 TS (M10 & 11) = 115000
Should that be 3.2 V6 next to GTA? if so interesting that it's lighter than a 2.5 yet kinda works considering to have larger bores you'll have less material mass. So is a 3.7/3.8 conversion even lighter??
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Sorry, should read 3.2 GTA (my eye sight a bit off at the moment).
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Quote:
Originally Posted by GhostyDog View Post
Should that be 3.2 V6 next to GTA? if so interesting that it's lighter than a 2.5 yet kinda works considering to have larger bores you'll have less material mass. So is a 3.7/3.8 conversion even lighter??
More aluminium bored away, but wider steel pistons added.. I reckon it won't be a massive difference, but if I had to guess I'd say the 3.7/3.8 will be just lighter..
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the sleeves aren't made from aluminium....
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Good point, a wider sleeve will have a greater weight than a narrower one, assuming the thickness of the sleeve itself remains constant.
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