PDA

View Full Version : E34 vs E60


Traian
02-05-2006, 12:35 AM
Does anyone know why the E34 M50 motor makes more power than the E60 2.5L motor? I know you know, but it has the same layout and displacement and is about a decade and a half older.
Hypr5
02-05-2006, 12:38 AM
The e60 525 has 215hp, 185lb/ft tq.
I'm pretty sure thats a decent amount more than the old m50.
winfred
02-05-2006, 12:43 AM
a little more power and about the same torque probably a more rpm dependant motor then the ol m50, it'd come down to gearing and if auto to auto how tight the tranny is in a drag id say


The e60 525 has 215hp, 185lb/ft tq.
I'm pretty sure thats a decent amount more than the old m50.
Traian
02-05-2006, 01:15 AM
Ah right I guess I must have meant the old E60 525 then, the one that made ~184 hp, soooo I guess it shared the engine with the E46 325i. Although the new 523i fits the same question.
rob101
02-05-2006, 01:35 AM
Ah right I guess I must have meant the old E60 525 then, the one that made ~184 hp, soooo I guess it shared the engine with the E46 325i. Although the new 523i fits the same question.
the e39 528i only had 190 hp as well, but a shiteload more torque throughout the rev range.. i know which motor i'd rather have and it isn't the m50, power isn't everything.
Hypr5
02-05-2006, 03:02 AM
The tq difference is VERY noticeable between the m52 in the e39 528 and the m50. I want an m52. =)

As for the 523i, VERY good question. WHY is it less power and tq than the old m50? That is indeed very interesting. Is it simply de-tuned for economy reasons?
winfred
02-05-2006, 10:44 AM
the 2.8 single vanos motor had the same bore as the 2.5 m50 but a 1/2 inch longer stroke, theres your torque, makes a e30 fly nicely :D


the e39 528i only had 190 hp as well, but a shiteload more torque throughout the rev range.. i know which motor i'd rather have and it isn't the m50, power isn't everything.
Hypr5
02-05-2006, 12:50 PM
the 2.8 single vanos motor had the same bore as the 2.5 m50 but a 1/2 inch longer stroke, theres your torque, makes a e30 fly nicely :D

hmmm... does the m52 crank fit in the m50??? That sounds fun.
pyro
02-05-2006, 04:11 PM
yah i remember reeding somewhere on the forum that the m52 crank can be made to work in the m50... ill look for it
rob101
02-05-2006, 04:20 PM
yah i remember reeding somewhere on the forum that the m52 crank can be made to work in the m50... ill look for it
yes indeedy they can fit but then again so can an s50b30 and s59b32 crank, need tougher rods though, as you will get a higher piston velocity because of the increased stroke, but if you have a non-vanos m50 no problem the rods is that are bigger than those in an s50 hehe:p
winfred
02-05-2006, 06:32 PM
just get the whole 2.8 bottom end and put your head on it, you'd need the pistons/rods anyway.....


hmmm... does the m52 crank fit in the m50??? That sounds fun.
pyro
02-05-2006, 06:57 PM
Wait if the stroke is a half inch more won't i need shorter rods? if i don't won't the piston hit the head?

So if right now i got a m52 crank 2.8liter itl fit perfactly in my non vanos m50?
wingman
02-05-2006, 09:27 PM
The tq difference is VERY noticeable between the m52 in the e39 528 and the m50. I want an m52. =)

As for the 523i, VERY good question. WHY is it less power and tq than the old m50? That is indeed very interesting. Is it simply de-tuned for economy reasons?

My understanding of the 523i/323i (2.5) is that they use the ram pipes from the 2.8 motor which are smaller in diameter. Why? Who knows. Please feel free to call me a goose if i'm off the mark...;)