Getting torque from M52

[slammin.e28]

S52 bottom end.

So, a friend of mine has a bottom he'll sell me. We discussed it last night and it seems to be the best bet to give a try. He wants my bottom end, so we'll swap + $$.

Now, looking around, I can't really find anyone who has done an "M52B32", of course, why would someone when they could just get an S52?

Mainly interested in power #s. Wish I knew a place with an engine dyno so I could run it if I do build it.

[Wanganstyle]

why not? it would be a fuel efficient low RPM range target lump. about 200 hp and 225 torque should happen @ the engine

How do you know no one has built this before for this specific reason?

[ForcedFirebird]

m54 has more torque and will bolt right in.

[slammin.e28]

why not? it would be a fuel efficient low RPM range target lump. about 200 hp and 225 torque should happen @ the engine

How do you know no one has built this before for this specific reason?

I really can't find anything. I search M52B32 and get mostly people using different crank/pistons, etc in an M52 with S52 cams and what not, again, trying to get high rpm HP.

I wish I could get an M60 to bolt up, but converting it to rear sump, then dealing with a custom bell housing, etc....meh, I'd rather rebuild a bottom end and make a 3.2l M52. No custom parts, all just nuts and bolts, and, well, money.

[slammin.e28]

m54 has more torque and will bolt right in.

Dual vanos waffleswaffleswaffles.

M54B30, is rated at 221tq. In my 330i (when it had about 60k miles on it) dynoed 200hp/200tq at the wheels.

I think I can get more with a 3.2 block. Same stroke, but the bore is 86.4mm vs 84mm.

[Wanganstyle]

Nobody will post these kinda results if they are building torquemonsters for cheating in racing series.

S52 bottom end with low lift cams is an ideal setup for gts2 and other similar dyno mandated racing series


When the only regulation is horsepower to weight; and torque is not accounted for

spec e30 cars got hp ban this year......because to many stroker engines. Over 168 rwhp = DQ Can't race.

Nasa gts3 loves de-tuned s54's to s52 power.....just for the sheer torque and rpm range.

Sent from my GT-N7100 using Tapatalk 2

[ForcedFirebird]

spec e30 cars got hp ban this year......because to many stroker engines. Over 168 rwhp = DQ Can't race.

Strokers?!?!? Doubt that. Stroke is easy to measure in impound simply by removing a spark plug.

[ForcedFirebird]

Dual vanos waffleswaffleswaffles.

M54B30, is rated at 221tq. In my 330i (when it had about 60k miles on it) dynoed 200hp/200tq at the wheels.

I think I can get more with a 3.2 block. Same stroke, but the bore is 86.4mm vs 84mm.

Yeah, but with the dual vanos and variable intake, that torque starts early and hangs around for a long time. Look at the dyno graph and compare it to a b32.

[Wanganstyle]

Strokers?!?!? Doubt that. Stroke is easy to measure in impound simply by removing a spark plug.

check the latest NASA newsletter

there are plenty of ways to get a stroker past spec e30 dyno........... think harder :)

a crank can also be offset ground for mini-stroker increase; rebello racing is famous for making a 3300cc S54 engine by offset grinding the OEM bmw crankshaft..... Rebello racing is also local.

Oh, and top running spec E30 cars sell for about $14,000-$16,000 asking here in norcal. id say more than half is the engine cost...as its only about 6-7k to build one if you keep the stock engine. The most popular chassis shop TC design cage is only about 2k

I had a mapping setup for my 10.5:1 327s 2.7L engine that dyno-ed LESS than a stock m20b25 on purpose.... switched ECU's are pretty common in norcal.

the cervesas XX dos equis lemons car somehow dyno'ed 147rwhp from their m30bxx; but on the straights it pulls like 200rwhp (as it blows past our ~ 180rwhp car)

i'm setting up some switches to loose about 10-15 hp on the dyno; our stock m20 did 154rwhp on the local spec e30 dyno and the 24v needs to dyno about 165 :)

Bay area Motorsports........we cheat HARDCORE :)

[slammin.e28]

Flip piston rings upside down and run methanol in the oil. You'll smoke the engine eventually, but M20s are everywhere.

Putting pistons in backwards is another old trick from dirt track racers.

[ForcedFirebird]

check the latest NASA newsletter

there are plenty of ways to get a stroker past spec e30 dyno........... think harder :)

a crank can also be offset ground for mini-stroker increase; rebello racing is famous for making a 3300cc S54 engine by offset grinding the OEM bmw crankshaft..... Rebello racing is also local.

Oh, and top running spec E30 cars sell for about $14,000-$16,000 asking here in norcal. id say more than half is the engine cost...as its only about 6-7k to build one if you keep the stock engine. The most popular chassis shop TC design cage is only about 2k

I had a mapping setup for my 10.5:1 327s 2.7L engine that dyno-ed LESS than a stock m20b25 on purpose.... switched ECU's are pretty common in norcal.

the cervesas XX dos equis lemons car somehow dyno'ed 147rwhp from their m30bxx; but on the straights it pulls like 200rwhp (as it blows past our ~ 180rwhp car)

i'm setting up some switches to loose about 10-15 hp on the dyno; our stock m20 did 154rwhp on the local spec e30 dyno and the 24v needs to dyno about 165 :)

Bay area Motorsports........we cheat HARDCORE :)

Quite involved in the local Se30 scene, working my way to comp license and am a track official. Also have tuned the m1.3 in the ChumpE to stop at 125whp to run in Time Trials, albeit it was making 170wtq ;)

I just have never heard of anyone stroking because it is so easy to detect, even an offset ground crank would measure when pulling a plug.

Yes, I knew about the rule change the day it was announced, so the HP war is over.

You can build an SE30 for a lot less if you are resourceful, I can buy a pre-bent cage for about $700, but actually just got my hands on a bender minus the hydraulics in trade for some shop labor (knock the cage down to a few hundo, wire, gas and time). Used sport shocks/dampers, used springs, mount the sub-frame/engine/trans solid, wheels/tires, then being resourceful, you can find used safety items.


You have to remember to build an all-new m20, you are looking at $5k-ish of that cost unless you have your own machining equipment for the block and head. Machining and balancing alone on this motor in my engine building room was $1500, .020" pistons are $700, valve guides, valves ($400), cam ($300), rockers ($300), rings ($100+), bearings (100+), oil pump ($150), crank scraper ($120 for a good steel one) it all adds up fast. It's hard to sell a .020" over rebuild for less than $5k. This list alone is $3500-ish before adding peripherals like gaskets, t-belt, pump, clutch etc, then someone has to put it all together.

Taking the podium after severely/blatantly cheating takes away the fact of driver skill.

[Wanganstyle]

come run in norcal then; there is just ridiculous cheating happening and its all covered up electronically;
even lemons is full cheating mode- its fair competition as everyone else is also cheating.
Racing = cheating.

look at all the moto IQ articles on the angry hamster and metro-gnome; there are hidden machine shops making crazy billet parts all day long for lemons cars; its not "cheating" its competition! This is northern california; lemons HQ is here.

If i was able to dyno the same curve with a 2700cc as a 2500cc on the local SE30 dyno with an noob self mapped low power chip; one who owns a dyno or has the engine built at rebello (they have in house engine dyno and all tuning) will have a huge advantage.

[2mAn]

in racing you're either cheating or losing

[slammin.e28]

Looking into intakes manifolds....

....anyone know if an M54B30 intake mani bolts up?

I read they make a good jump in TQ when bolted up to an M52TU. I's probably just make a plate to simulate the DISA valve to force air in the most tq producing fashion.

I ask because we just replaced a blowed up M54B30 at work. I can nab the intake mani before the block get's hauled off.

[digger]

torque at low rpm is all about
- cubic inches
- compression
- cam timing
- burn efficiency