Which bmw 6 can most cost effectively make 300whp NA? I know s54 but those cost alot of money. What about the lesser motors?
Which bmw 6 can most cost effectively make 300whp NA? I know s54 but those cost alot of money. What about the lesser motors?
Side tracking this thread a bit but I would like to know if there is a V6 in NA form that can do that. All aluminum would be nice as would old school EFI. No VVT and what not so that can be converted to MS with relative ease. Also being able to bolt to a manual is a must!!!
S52 will take even more.
S52, OBD-I manifold, 3.5MAF, headers, tune, Schrick cams typically ends up in the 255-260whp. Which ends up being more than an S54.
S54 + E85 should do it.
S52 was the e36 M motor right?
Honda J 3.5 does it stock and cheap.
In reply to Gunslinger:
Im aware but I would like an inline 6 and bmw motors are cheap.
hey. where are you going with this? 
You keep that german stuff well away from that Z-car I see in your profile picture.
THINK OF THE CHILDREN!!!
Compression and poor mans race fuel (e85)?
In reply to Hungary Bill:
It may or may not end up in my 240z. Other choice is the m70 v12. Im really indecisive on the motor for it. Want something that makes 300-ish whp as simple and as reliably as possible. Only catch is no v8.
Fitzauto wrote: In reply to Hungary Bill: It may or may not end up in my 240z. Other choice is the m70 v12. Im really indecisive on the motor for it. Want something that makes 300-ish whp as simple and as reliably as possible. Only catch is no v8.
Stay away from the V12, lots of hard to find/expensive parts (throttle servo's I think?) It's just two M20s put together, 2 wiring harnesses, 2 computers, etc and still only 300ish crank. Just not worth it.
Yes, S52B32 = 96-99 M3, S50B30 = 95 M3.
S54 + E85 is your best bet.
In reply to z31maniac:
Whats involved in the e85 conversion?
On a similar note: what other na inline 6s make 300hp?
BMW s38b36 315hp stock E34 m5
Jeep 4.0 with the 4.2 crank and rods which makes it 4.7l can do it....cant think of any other inline 6 that can do it easily. Also not like anyone wants to swap a heavy ass jeep motor in anything
They're getting pretty good numbers from that Vortec 4.2 in stock trim. Don't think there's much of an aftermarket for them though.
Can't you get pretty close to 250 or so with the L28 that's in there? For what you'd spend on a engine swap you could have a weber 6-pack and a hot cam from Z-Car parts.
In reply to Hungary Bill:
Thats definetley an option. Just trying to weigh all my possible options.
if I was to swap a BMW I6 into a Z.. I would look at the 3.0 from the 330 and the Z3/4 cars. While not as powerful as the full on S52 and 54.. the M54 makes good power stock (225) and has an aluminum block to keep the weight down
Last version of GM's Atlas 4.2 liter has a rating of 291hp (as per wiki).
The prices of the BMW S54 have been coming down of late. With a few mods, it will produce 300whp. A guy who uses the same BMW mechanic I do has one that is putting out over 300whp now. And it sounds great too!
Gunslinger wrote: Honda J 3.5 does it stock and cheap.
I just looked that up and they all seem to have vvt. They are also only rated at 250 hp and similar torque. I am intrigued though. My friend has an MDX with a blown up trans. Wonder if he would part with the motor and the complete harness and ecu. Hummmmmm.
The euro spec S52 made 320 hp, so if you could purchase a euro spec head and cams and put it on a U.S. spec block (if it fits directly), may be another easy (if costly) option.
I know a guy who's running about 315 to the wheels with a NA VQ35. Haltech, cams, headers and custom intake with ITBs. Totally streetable.
mad_machine wrote: if I was to swap a BMW I6 into a Z.. I would look at the 3.0 from the 330 and the Z3/4 cars. While not as powerful as the full on S52 and 54.. the M54 makes good power stock (225) and has an aluminum block to keep the weight down
Thats the direction Im leaning. Looks like I would have to go super or turbo to get 300whp though.
Why not start with one of the older 3.5l big sixes? I know people turbo those to the moon, so I would guess head work, increased compression, and mega squirt would get you in the ballpark. Might be a heffer though, IDK.
RossD wrote: Last version of GM's Atlas 4.2 liter has a rating of 291hp (as per wiki).
even the old ones are rated around 275 if i remember right, with some breathing mods and HP Tuners im sure 300 hp isnt to unrealistic. And I would guess its cheaper then bimmer engines
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