M10 + S14

[LukeE30IX]

Is it possible to take a M10 block out of a 318i and put on a head from a S14? If not why not. What kind of modifications would i have to do?

[jimmyd1]

Nope, can't do that one. Bore and stroke are longer on the M3, crank is also bigger on the M3. The S14 M3 motor is also a DOHC, while the M10 motor is SOHC. Sorry guy. Try and get your hands on either a complete S14, M20B25, or if you are not a frivilous person concerned with cost, an M50, S50, or S52. I would think that the M20B25 would be the motor that would be most available to you.

[NickP]

Yes it can be done.

The starting point for the S14 was the M10 block. People fit the S14 2.3 crankshaft in the M10 all the time.

People also have bolted up the head to the M10 block - I don't know the specifics... Check this website for more info: http://www.m2bmw.com/m2BMW/laupa.htm

[miafori]

do the M10s have chain or belt driven pulleys? I think S14 has chain...

[crazyvadim]

LoL.....1 guy says no the other says yes.

[Boris The Blade]

that car on that site is SICK!!!!

[snd84318i]

maybe its both yes and no , i have a m10 but its from a e30 . that m10 is from a 2002 are that that different . or are they the same platform ? anyone knows

[nzer]

Originally posted by miafori
do the M10s have chain or belt driven pulleys? I think S14 has chain...

m10 is chain.

[LukeE30IX]

Why would the M10 be a chain and the M20 be a belt?
The stroke and the bore are bigger and longer
the S14 was based on the M10 block. And i did think about getting an S50, dont have the cash for that, An M50 would be more in my sites. Well thanks for the help Guys
Luke

[jimmyd1]

Snd I think you are on to what is was trying to explain. Per the specs, I do not think you can fit the s14 crank into the block on a M10 318i. But I think that it may be possible to do an M10 e21, simply because the stroke is longer, unless you are able to swap the rods for the s14 crank w/ those from the M10 318 crank. I am also not familiar with the dimensions of the block as well(length and width). It also depends on what you want to do with the motor. If you want to turbo the motor, I think it might be a little too extreme, as the stroke on the 318 is 70 mm and the stroke on M3 is 84 mm.

[NickP]

Originally posted by snd84318i
maybe its both yes and no , i have a m10 but its from a e30 . that m10 is from a 2002 are that that different . or are they the same platform ? anyone knows

There's a bunch of differences throughout its model run but its basically the same motor.

[NickP]

Originally posted by jimmyd1
Snd I think you are on to what is was trying to explain. Per the specs, I do not think you can fit the s14 crank into the block on a M10 318i. But I think that it may be possible to do an M10 e21, simply because the stroke is longer, unless you are able to swap the rods for the s14 crank w/ those from the M10 318 crank. I am also not familiar with the dimensions of the block as well(length and width). It also depends on what you want to do with the motor. If you want to turbo the motor, I think it might be a little too extreme, as the stroke on the 318 is 70 mm and the stroke on M3 is 84 mm.

Why wouldn't it work with the e30 version of the m10?
The basic steps of fitting the crank are either machining the s14 crank or m10 timing cover for the front seal to fit. m30 oil pump sprocket and chain. You'll also need to machine the m10 crank pulley if you're not going with the s14 one.

You can use either rod - they have the same width / diameter at both ends; the s14 rod is longer. They do require different bearings though, the s14 ones being far more expensive.

Depending on the rods you choose ( $$$, revs vs torque ) you'll have to get custom pistons done. Most people go for a 91 or 92 mm bore.

This is obviously not a definitive guide but touches all the main points.