Originally posted by kylebes1
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The comprehensive DOHC engine swap thread.
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-Brandon
'86 325es S50
'12 VW GTI Autobahn DSG
'03 540i M-Sport (sold)
'08 Jeep SRT-8 (sold)
For sale:
S50 TMS chip for Schricks
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What's everyones estimated costs?
I'm looking to do a m50 swap for less then $3,000. Is this reasonable? What route should I take as far as engine selection, transmission, etc...?
Does VANOS make a difference worth the extra money? I'm looking to keep the motor fairly stock for a couple years (well, I'd like to get an intake/exhaust system as well as software). Right now I have a 325e which isn't exactly fast. I just want something that will be able to outrun e30 325i's. Would a 92 m50 be a good choice, or should I stick with the 93+ vanos?
Justin
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Little info on the Z3 2.8 block, from my knowledge...
52 pounds lighter than a 325 block, remember that the 325 block is lighter than the M3 block, since the M3 block is physically larger to begin with. (block block block)
Most will tell you that the sleeved alloy block cannot be bored, though it can; but shouldn't go past 85mm. There needs to be enough sleeve material for safe operation, but 1mm overbore is fine. The pistons that come in the 2.8 block, like all pistons in OBD-2 motors, have a very nice graphite coating, and these pistons work fine.
A killer street setup for the alloy block is to use a 3.0 crank with the stock pistons machined down to desired compression; 10.9-11:1 is the shit for a street M/S50 (assuming you can get 93octane). The 3.2 crank seems to be overkill in my opinion, on the alloy block; why run such a long stroke (89.7mm) when you're only running 84mm bore? The 86mm stroke of the 3liter crank makes for a very nice package.
Don't forget that the alloy block uses cross-bolt main bearings. Very nice. :nice:
The aluminum block used to sell for about $2100 from the dealer, I'm not sure what the latest prices are though. Some might not find it worth their while to swing for the alloy block, as it is pricey and to build in stroker form requires custom machine work or custom pistons (even more $$). But, as mentioned above, it is a hefty weight-loss over the front axle, and you'll be hard pressed to find any other single modification that can drop that much weight. (carbon hoods only drop about 17-20 pounds).
GrapeDrink is right though, about losing weight out of the drivers seat. I've slimmed from 215 to ~160 and my 24v 318 scoots along much quicker than before! ;)
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Originally posted by Tony SStu
Whats the set up on your Dads M3. Total displacement, compression, cams, approx HP.
Also does any one know which blocks to avoid as far as the Nakaskil cylinder liner issue. Not sure if the US blocks had this problem
-alloy block, machined stock pistons, 3liter crankshaft, around 11:1 compression.
-Head was worked considerably with all of his tricks, 252/240 cams, conical valvetrain, etc.
Comes to around 2850cc, unsure of the peak horsepower. It was setup using his 'high torque rise' design, and made unbelievable midrange power and pulled steadily to high revs.
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Pardon my ignorance, but were you guys still able to use a SSK kit using a Getrag 260 trans without modifications to the shorter lever?
TIA, Ed1988 E30/S50...now with S52; Track
1994 Miata R; ES Solo2
1998 Lexus LX470; Wife (Slee'd anyway)
2002 BMW 530i; A+ Commuter
2002 BMW 325iT; Sport/Premium 5-speed
2011 21' EconoTrailer
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Originally posted by ed94rPardon my ignorance, but were you guys still able to use a SSK kit using a Getrag 260 trans without modifications to the shorter lever?
TIA, Ed
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Picking up my m50!
Hey guys!
This is my fist post on this forum!
I'm going down to pick up my m50 tomorrow morning and I can't wait. I have all kind of things inroute to my house to start this project. I've been waiting along time for this day. I did have a couple of questions about this swap though.
First, What flywheel/clutch setup do I want? I'm guessing m50 stuff, but I plan on running m20 transmission. Or will there be a problem with bellhousing sizes?
Second, If I decide to go with a M3 trans (casting number 1 222 751 9) will this affect the flywheel/clutch setup? I know I'd have to run a different drive shaft, but thats fine with me.
My only worries with this swap is from the transmission to the differential, what are all my options here? Driveshafts, guibos, etc...
And maybe the wiring scares me abit.
Sean[img][/img][img][/img]
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Re: Picking up my m50!
Originally posted by SmokinTiresHey guys!
This is my fist post on this forum!
I'm going down to pick up my m50 tomorrow morning and I can't wait. I have all kind of things inroute to my house to start this project. I've been waiting along time for this day. I did have a couple of questions about this swap though.
First, What flywheel/clutch setup do I want? I'm guessing m50 stuff, but I plan on running m20 transmission. Or will there be a problem with bellhousing sizes?
Second, If I decide to go with a M3 trans (casting number 1 222 751 9) will this affect the flywheel/clutch setup? I know I'd have to run a different drive shaft, but thats fine with me.
My only worries with this swap is from the transmission to the differential, what are all my options here? Driveshafts, guibos, etc...
And maybe the wiring scares me abit.
Sean[img][/img][img][/img]
The wiring is really simple. Just follow the pin chart by AKG. If you have an 89' + e30, you need to wire up the unloader relay. I'm pretty sure someone explained it earlier in the thread.'91 318is
sigpic
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If you search, there are plenty of debates over going performance m20, or stock m50... Seems like unless you're going to boost your m20, the m50 is the way to go. By the time you spend $4-5k on a decent s14, you might as well buy an s52 with a few performance goodies (obd-I, schrick cams, euro headers, custom software, etc) and get 300hp. But then again, you wouldnt be redlining in the 8k range either... I donno, if you have shit loads of cash, and arent too worried about your car being in the garage, go for a built s14... It'd be badass.
Doing something M50 related? -> http://www.addissimo.com
On Myspace? ->http://groups.myspace.com/r3vlimited
BF2142 SN = BillyGoose
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Stu,
One more question. When using the 260, how do you bend the selector rod? It's alloy and seems awful brittle!
Thanks,
Ed1988 E30/S50...now with S52; Track
1994 Miata R; ES Solo2
1998 Lexus LX470; Wife (Slee'd anyway)
2002 BMW 530i; A+ Commuter
2002 BMW 325iT; Sport/Premium 5-speed
2011 21' EconoTrailer
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Originally posted by ed94rStu,
One more question. When using the 260, how do you bend the selector rod? It's alloy and seems awful brittle!
Thanks,
Ed
"See, we're adding a little something to this month's sales contest. As you all know, first prize is a Cadillac Eldorado. Anyone wanna see second prize? Second prize is a set of steak knives. Third prize is you're fired."
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Originally posted by e30MattOriginally posted by ed94rStu,
One more question. When using the 260, how do you bend the selector rod? It's alloy and seems awful brittle!
Thanks,
Ed
Originally posted by SmokinTiresWere can I find this AKG wiring chart?
Although, their list is not complete. I'd like to know the complete list though, so I could have it on hand when I do the swap this spring.-Brandon
'86 325es S50
'12 VW GTI Autobahn DSG
'03 540i M-Sport (sold)
'08 Jeep SRT-8 (sold)
For sale:
S50 TMS chip for Schricks
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