Talk:Mitsubishi 3B2 engine

I'm not too sure that the weight and dimensions of the engine are correct in the specifications list.

For the weight, in the .pdf "Newly Developed Three-Cylinder MIVEC Engine" it states that the 3B20T is roughly 20% of the weight of the 3G83 SOHC. Going from "Development of Mitsubishi “i” Powertrain" it states that the 3G83 (not stated if it's SOHC or DOHC) weighs 72kg. This would put the 3B20T at about 58kg then wouldn't it?

Also with the dimensions, these are from the 1L developmental 3B2- engine. How certain can we be that the 1L is based on a bored out and stroked 3B20?

Also I am after some information regarding the crank from the 3B20/T, if anyone has any info could they please place it on here.

Thanks heaps, Magnarama 09:18, 14 August 2007 (UTC)Reply

The trouble with the weight is that the included figures are the only ones we have (all information needs to pass Wikipedia's standards for verifiability. We don't know that the engineer's comparison was based on bare head/block dry weights, or comparing the engine+ancillaries. I reckon it's the latter, since in context he mentioned the use of lightweight manifolds. Even if his figure is accurate, it's probably (3G8's 72kg + mass of ancillaries) = 20% more than (3B20's 67kg + mass of ancillaries). And of course, any sums like that are speculative, and original research, which isn't allowed.

The 660cc is based off the 999cc, which came first (in the 2003 i-Concept). It was too big for the kei class, so the 3B20 was developed. The 3B2- was reintroduced for the next gen Smart Fortwo. We know they're the same engine family because Smart USA said so, and this is confirmed by the exact bore/stroke match between the "IL3" and the new Smart engine.

Not a lot that mentions the crank. The engine's problably too new to have been removed and dismantled by many people, so there might not be a lot out there. If you contacted Mitsubishi directly they might be able to help. What exactly are you looking for? --DeLarge 12:51, 15 August 2007 (UTC)Reply

Hi,

Sorry I didn't reply for a while, Ive had a lot of stuff going on atm. What you said about the ancillary weights makes perfect sense, I didn't even think about it before.

I wasn't aware of the Smart 1L stuff before, that's why I was wondering about the similarities/differences between the two.

I'm after information about the bottom end as I'm interested in using a low revving/high torque engine in a competition called formula sae, the problem is that the rules only allow 610cc max so I'm looking into if it's possible to de-stroke or sleeve the engine. Also, when looking at the engine it appears to me like the block and head are one casting, as it appears like there is only a block/head, rocker cover and sump. Could anyone confirm or deny this?

Magnarama 13:13, 2 September 2007 (UTC)Reply

I would like to know the difference between the il3 and the 3b2 because I would like to use the smart engine for higher horsepower and torque rather then gas mileage. Given the similarities with other high powered 1l 3 cylinder engines, I would like to know if it can be made to put out numbers like ford? Shivers22 (talk) 22:01, 10 January 2024 (UTC)Reply

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