BMW engine conversion

[Craved]

something to look into... cheers Ronin... post it up when you get home if you can.. cheers

[Craved]

hey Duncan, they are the broker guys... nothing wrong with some european action !

[finch]

mates don't let mates drive 3 series BMWs.

Get them into skylines

LOL... thinking about the skyline engine in the BMW... does that count?? ha ha

yeah robin if you could post that when and if you get a chance that would be awesome, thanks

[Craved]

well the rb25 is only a little bigger than the rigi BMW engines.. only thing is the exhaust is on a different side, as with fuel lines..

[Ronin 09]

No worries, will post the info when i get back to melb and dig out the mag

[finch]

well the rb25 is only a little bigger than the rigi BMW engines.. only thing is the exhaust is on a different side, as with fuel lines..

yeah.... thats the biggest problem i have been told.... custom manifold ect....

does any one know much about the 1jz twin turbo soarer engine? how do you think that that would go in the BMW? just trying to look at as many options as i can before i decide.

is having a 50/50 wight ratio really important? why?

thanks

[Craved]

yeah i reckong the 1jz would fit, exhaust on the right side etc!

50/50 is what you would want to keep if your thinking of doing track work! thats what helps these cars handle so well, perfectly balanced! upset that balance and the the characteristics (?) of the car chance completely!

[finch]

like steering, cornering, braking ect?

if the engine was way heavier. would upgrading the suspension and brakes (i know you have to do this with a bigger engine anyway) be the best way to hinder these problems? and get the car handling better?

[finch]

the 1jz would be a awesome transplant i think, what about the gearbox, tail shaft ect, any idea how that would go? i understand this is a nissan forum, ill ask on a toyota one, but any help/ personal oppinions greatly aprechiated

thanks

[Craved]

just having a little think about it,,,,, when i think of the chaser's the 1jz came from i think that the gearbox will be a huge problem fitting into the existing tunnel for the car! also gear stick placement will be a problem! have you seen how small the original g/box in these E30's are???? they are tiny so it may be an issue......

although the E30's use linkages external to the box so this may allow a bit more room for a larger box, that only being id the 1jz g/box is internal linkage like the rb25 boxes!

[finch]

ok thanks heaps for that, craved. ill definitly look into it!!

how big are the rb20 gearbox's? are they the same as rb25? if not are they interchangable?

[Craved]

i dont think that they are interchangeable from rb20 to rb25... the allignment etc would be off.. however i have a feeling that they would be rather large like the rb25 boxes!

someone with an rb20 may be able to confirm!

just thought id mention it as it took a fair bit of work to fit a CA18DET into a sprinter, the hole for the gear shift had to be moved back about 100mm, and changed the way the dash sits within the car!

[Ronin 09]

Ladies and Gentlemen, as promised (and after rummaging through a sh*tload of magazines...), diff ratios for E30s (courtersy of 'Bimmer' magazine, Dec '98):

2.73:1 --------- 325e

2.93:1 --------- 325e

3.45:1 --------- 323i (euro - what we have here)

3.73:1 --------- 325i(s)

3.90:1 --------- '84 - '85 318i (case different, ring and pinion fits)

4.10:1 --------- '91 318i

4.10:1 --------- E30 M3

4.22:1 --------- '91 - '92 318i convertible

From other models, but with modifications:

3.25:1 --------- E28 533i/535i (case bolts into E30, but with E30 cover plate)

3.90:1 --------- E28 M5 / E24 M6 (ring and pinion, LSD fit into E30 diff housing)

As far as I know, most of these diffs come as slippers and open diffs. You can get them repacked (reshimmed) to increase the lock - the last one I had in mine was a 70% locker... noisy but tight and held well.

Hope that helps.

NB: to tell the diff ratio (and if it is a slipper) the tags are on the back of the diff next to the speedo sender. Eg: "S4,10 XXXX" is a 4.1 LSD. Note these tags can be switched, so be careful.

[Craved]

thanks Ronin, might look into that e28 M5 mod to see if we can source one here!

[finch]

excelent, thanks heaps for that robin. ill have to talk with some bmw people, see whats available etc, but im keeping that info....

the more i think about it, and the more i get told, the easier the sr sounds to do. the gearbox goes in no worries and lines up with the hole and everything. and then nissan nose just needs to be welded on to the tailshaft.

i think that ill just go with the sr.... (sigh) would have liked a bigger one, but i probably dont need it, i know i wont need it. maybe later, ill be happy with the 2L turob, ill get some mods for it... he he

thanks for all the info guys, really aprechiate it.

if you can think of any think else to add, please do

[Craved]

the 325i block and im pretty sure a twin cam head from the 530 will go on,, that something we are looking into

but the bmw have a really good bottom end, huge rods, just need some better forgies and decompression then turbo the thing!

[Ronin 09]

Craved, the basic block architecture for the M20 and the M40 (i think it is this designation, ie. the straight sixes from E36) are the same. Thats why I could build a 2.9L from my 325 block using a E36 328i crank.

It wouldn't surprise me if an E36 twin cam head bolted up to the bottom end of an E30 six...

[Craved]

yeah im pretty sure the twin cam heads do bolt up! just gotta find one!

didn't realise the 328i crank would fit though, does this just increase the stroke? wouldn't that drop the engines rev range?

[finch]

just had an idea sugested to me,

go out and get a '79 320i 2.0L (an example) engine out of a junk yard. Rebuild it and throw into the 318. then turbo it later......

The factory 2.0 had a longer throw crankshasft at 80mm instead of the 71mm of the 1.8 in the 318. I think thats what the difference was. They had the same piston size at 89mm. The big difference was that the 2.0 had a double roller cam timing chain while the 1.8 had only a single roller cam timing chain. Bmw did turbo a 2002 back in the 70's. So the engine can handle it for sure.

what do you think??