What "bolt ons" bring an s52 to 300hp and what's the cost?

[digger]

S54 rod bearing is 49mm - they are wider
S52 rod bearing is 45mm - same as any m50

I'm not sure about diameter; but the S54 crankshaft is very similar

that is not width, 45/49mm is the diameter

according to ACL website

S54 rod bearing width/length is 16mm-49mm diam http://www.aclperformance.com.au/ACL...EngineBRgs.htm

S52 rod bearing width/length is 18mm- 45mm dia http://www.aclperformance.com.au/us/...bearingsus.htm

S50B32 rod bearing width is 18mm-49mm dia

http://www.aclperformance.com.au/ACLRaceSeries-BMWS50B32PerformanceEngineBearings.htm

S50B30euro rod bearing width is 18mm-49mm

http://www.aclperformance.com.au/ACLRaceSeries-BMWS50B303.0LPerformanceEngineBearings.htm

the Molnar rod page also suggest the bigend of the rod on the S54 is indeed smaller

http://www.molnartechnologies.com/molnar-rods-sp.html

seems like a pretty stupid move by BMW to reduce the width compaed to the S50B32 and S50b30/euro (neither of which are kind to bearings to start with) when turning more revs.

[The Dark Side of Will]

I'm not sure about diameter; but the S54 crankshaft is very similar to a 2JZGTE crankshaft; i had two torn down side by side. camshaft lobe spacing is almost identical also

s54 has M11 headbolts IIRC; they were weird.
rod bolts are also weird and got revised once.

The cam profile of the S54 is a porkchop; asymetrical. Is this due to the fingering valvetrain setup?

Asymmetrical is due to finger-follower asymmetry (like the M20, the opening arm ratio is different than the closing)

What do you mean by similar to 2JZ?

A whole lot of MFG's use M11 head bolts nowadays.

[Wanganstyle]

rod ratio is not a problem when the 97 or 98mm stroke S54 strokers still use the 139mm rod.
S54 rod bolts are 11mm (according to realoem) which is bigger than the 9mm S52
Anyone can confirm the rod bearing width on the S54, I read one source that suggested it was narrower than the other inlines but a bigger diameter? it uses a smaller pin to apparently. langracing do a wider bearing on the S54
With finger follower valvetrain the ramps could be quite a bit faster, analysis would show the difference

S54 rod bearing is 49mm - they are wider
S52 rod bearing is 45mm - same as any m50

I'm not sure about diameter; but the S54 crankshaft is very similar to a 2JZGTE crankshaft; i had two torn down side by side. camshaft lobe spacing is almost identical also

s54 has M11 headbolts IIRC; they were weird.
rod bolts are also weird and got revised once.

The cam profile of the S54 is a porkchop; asymetrical. Is this due to the fingering valvetrain setup?

[digger]

Ahh... didn't know these two. (Delta rod ratio isn't that big a deal... 1.56 to 1.60 isn't a big difference, but is a move in the right direction)
Are the rod bolts in the S54 bigger?
Enough extra airflow and lift to make the power, VANOS to civilize the powerband.
With fast ramp profiles and high flow ports, duration doesn't have to be that long, even for an 8k RPM engine.

rod ratio is not a problem when the 97 or 98mm stroke S54 strokers still use the 139mm rod.
S54 rod bolts are 11mm (according to realoem) which is bigger than the 9mm S52
Anyone can confirm the rod bearing width on the S54, I read one source that suggested it was narrower than the other inlines but a bigger diameter? it uses a smaller pin to apparently. langracing do a wider bearing on the S54
With finger follower valvetrain the ramps could be quite a bit faster, analysis would show the difference

[Mistawall]

oh god i cant believe i read all 16 pages of this thread....

[FredK]

^ you forgot a CAI.

[Nesset]

What "bolt ons" bring an s52 to 300hp and what's the cost?

Cams pistons bigger valves and a chip with a full system with headers ect

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[nando]

I'm sure you could install an S54 relatively inexpensively if you were resourceful about it. A decent ballpark is that it will cost around $2500 in installation parts on the low end, plus the cost of a flash.

There really isn't much fabrication involved. You'll need to make a few sheetmetal brackets that you can easily make with a bench vise, a way to cut the metal, and a drill.

I can flash MSS52/MSS54 for less than 10% of the total swap cost. :)

[The Dark Side of Will]

Wider rod bearings

The rod length is 4mm longer (139mm vs 135mm)

Ahh... didn't know these two. (Delta rod ratio isn't that big a deal... 1.56 to 1.60 isn't a big difference, but is a move in the right direction)

Are the rod bolts in the S54 bigger?

Perhaps this would show the large difference in time-area and some quantative data for the clear reason for the 100bhp deficit.

Enough extra airflow and lift to make the power, VANOS to civilize the powerband.

With fast ramp profiles and high flow ports, duration doesn't have to be that long, even for an 8k RPM engine.

[FredK]

I'm sure you could install an S54 relatively inexpensively if you were resourceful about it. A decent ballpark is that it will cost around $2500 in installation parts on the low end, plus the cost of a flash.

There really isn't much fabrication involved. You'll need to make a few sheetmetal brackets that you can easily make with a bench vise, a way to cut the metal, and a drill.

[clydesdale]

Drop car off at shop and write check seems to be the method you may have the most success with.

I'm guessing this was sarcasm. I just want to make sure that there is support available for this swap. There are plenty of threads to dig through for an s52 swap. I have enough skills to follow a well laid plan, I don't have enough to fab or machine parts to make the swap work. I simply want to make sure that I can find a plan to follow.

Also, what is the usual cost difference. Last I checked, you should be able to get an s52 swapped for between $5k-7K. How much more for the s54?

Thanks.

[digger]

Yeah, head flow is power, but the throttle per cylinder really civilizes big cams.
How is the S54 bottom end different than the S52? I know the S54 oil pump and balancer are badass, but are the rods, crank, bearings, etc. different? The S54 has 0.6mm more stroke, right?

The S54 has a 1.4mm longer stroke (91mm vs 89.6mm) and 0.6mm bigger bore (87mm vs 86.4mm) which is not much different to the S52. The rod length is 4mm longer (139mm vs 135mm)

Head flow is only potential power, has anyone ever plotted out the cams for the S54 or S52? it would be interesting to see a plot of head flow in CFM vs crank angle at the respective peak hp rpm (whatever the vanos position is at that rpm).
Perhaps this would show the large difference in time-area and some quantative data for the clear reason for the 100bhp deficit.

[Wanganstyle]

Yeah, head flow is power, but the throttle per cylinder really civilizes big cams.

How is the S54 bottom end different than the S52? I know the S54 oil pump and balancer are badass, but are the rods, crank, bearings, etc. different? The S54 has 0.6mm more stroke, right?

Heavier duty crankshaft
4 bolt crank damper mounting vs 1 for pedestrian engines
Double chains on cam drive
Wider rod bearings
Wild head with bucket less shims; can't do this one aftermarket.
30 degree +/- vanos on each camshaft vs pedestrian 15deg.
pork chop profile cams

The 6x throttles are about the most tame thing on the s54.


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[The Dark Side of Will]

Yeah, head flow is power, but the throttle per cylinder really civilizes big cams.

How is the S54 bottom end different than the S52? I know the S54 oil pump and balancer are badass, but are the rods, crank, bearings, etc. different? The S54 has 0.6mm more stroke, right?

[nando]

well it's not going to make 350+bhp on stock internals, but it will most definitely help. what you don't have is a bottom end that can take 8,000rpm and a head that just keeps on flowing. not that an S54 bottom end is particularly well designed but that's one way it makes more power.