The S42 Race Engine !!!!

[swiss318is]

Originally Posted by RouteZeroDesign

Utterly utterly speachless....

The main power of an NA car is in the head so pictures arent just worth a thousand words.....theyre worth millions!!

Excellent work mate, and its brilliant that your going back again...i must have my s42 fix
Next time...your mission is to fill your memory card

i hope that the next time we find the cams, the camcarriers and the valves... and perhaps the car is liftet up... i need to take pics from underneath..

Originally Posted by RouteZeroDesign

Its interesting to see the use of bronze valve seats, i wonder why that is?

a question more... it could be beryllium because the car is a late version of the 320 stw...

Originally Posted by RouteZeroDesign

I wonder how they managed to make the head lighter than the standard m42.
Different material used? Shaving the block?

i have no idea... i lifted up the s42 head.. and then 30min later at home my m42 head and there was a significant difference.. perhaps because the intake and outlets are much more bigger than the stock ones.. saves maybe a couple of gramms and if you count every corner where they grind some material ?!... all in all around 500-600g ??? or more??

Originally Posted by RouteZeroDesign

Its crazy that they polished the inside of the block, obviously trying to eake out every last horsepower. Some race engines have painted water gallerys to reduce friction and increase the transfer of heat between the block and the water.

they polished the inside of the block, the target is.. keep the oil where it has to be... and thats not on the sidewalls of the block or in the timingcase..

Originally Posted by RouteZeroDesign

Swiss- You say the dry sump tank is near the gearbox? you mean under the intake manifold?

no, the owner told me that the drysumptank is AROUND the gearbox.. i will post pics when i can see the car from underneath..

[colin86325]

Outstanding pics, keep them coming!

[RouteZeroDesign]

Originally Posted by swiss318is

i hope that the next time we find the cams, the camcarriers and the valves... and perhaps the car is liftet up... i need to take pics from underneath..

That would be brilliant, it would be good to see if they made any attempts at flattening the floor or if they have added any bracing..possibly the xbrace.

Originally Posted by swiss318is

a question more... it could be beryllium because the car is a late version of the 320 stw...

Yeah it seems most likely that they used Beryllium valve inserts.
It would be nice to be able to run Ti valves with these inserts on a road car, but i think they need replacing quite often. Possibly one of the reasons the s42 had to be rebuilt after every few races.

Originally Posted by swiss318is

i have no idea... i lifted up the s42 head.. and then 30min later at home my m42 head and there was a significant difference.. perhaps because the intake and outlets are much more bigger than the stock ones.. saves maybe a couple of gramms and if you count every corner where they grind some material ?!... all in all around 500-600g ??? or more??

Very good point, every little bit of material adds up. Even if its only a few grams per port it adds up to a large amount.
They might of extrude honed the oil and water ways in the head for a smoother flow, but this process is very time consuming, difficult and can be hit and miss at the best of times.
I remember from a few years ago, when i got to look around a JGTCC GT500
skyline that was at the phoenix park races. The main nissan engineer that came over with the car was telling me that in order to cut down every last bit of weight, they shave the engine block
They shave bits of metal off the block using air grinder to remove any material that is left over from casting and isnt fundamental to the block's integrity....now thats attention to detail. It also helps when downshifting at high speed. The lighter block doesnt have as much mass to jerk around, so it doesnt unsettle the car when shifting down into a corner.

Originally Posted by swiss318is

no, the owner told me that the drysumptank is AROUND the gearbox.. i will post pics when i can see the car from underneath..

AROUND the gearbox? that is crazy, ive never seen that before but i suppose you have to put it where ever you can.
What happens if the flywheel disintegrates? Does it have a shield to protect the oil tank?

[r0ckrat]

Originally Posted by RouteZeroDesign

What happens if the flywheel disintegrates? Does it have a shield to protect the oil tank?

If the flywheel disintegrates, hopefully the engine stops as fast as it would lose oil. Do those cars really have much of a flywheel to lose anyway?

[RouteZeroDesign]

Not much of a flywheel but still, any weight spinning at 8500rpm will have a huge amount of momentum if it disintegrates.
I remember an old horror story where the flywheel on a lotus elan race car disintegrated at high rpm and parts of it ended up lodged in the roof....ever since then they run a carbon kevlar honeycomb plate around the trans tunnel

[RouteZeroDesign]

Swiss- When you go back the next time is it possible for you to get more specs on the head?
If they allow you to/if you can be bothered, could you check the volume of the ports and the combustion chamber for each cylinder?
(i can show you how, if you want)
Just a thought, as it would give us loads of information about what porting they did to the head.

Boyracer- Would any of this information be in your documents? if you dont mind me asking..

[swiss318is]

ohh...man..!!!the combustin chambers are the same volume as our..!! i asked that! they only polish the chambers and prepars the four to the same volume... the intakes and the outlets are another history..
i can ask him if i can take the cylinder head home to make some measurement..!

[Boyracer]

Originally Posted by RouteZeroDesign

Boyracer- Would any of this information be in your documents? if you dont mind me asking..

http://www.flickr.com/photos/25412802@N07/2395594069/

There is line "Einlasskanalquerschnitt breite/höhe/radius 52 / 29.7 / R 14.85 mm"

I think that is intake port dimensions widht, height and radius since it is oval shaped

I entered the data to my excel and did some calculations (I have measured my stock M42 ports earlier, it is 51,48 / 28,17 mm)...

S42 intake port area: 1355.1 mm2
M42 intake port area: 1279.89 mm2

So if those values in document are correct, S42 has only 5.8% larger port!

Someone (swiss?) has to measure the S42 ports to be sure.

[swiss318is]

Originally Posted by Boyracer

http://www.flickr.com/photos/25412802@N07/2395594069/

There is line "Einlasskanalquerschnitt breite/höhe/radius 52 / 29.7 / R 14.85 mm"

I think that is intake port dimensions widht, height and radius since it is oval shaped

yes... einlass means intake...

Originally Posted by Boyracer

I entered the data to my excel and did some calculations (I have measured my stock M42 ports earlier, it is 51,48 / 28,17 mm)...

S42 intake port area: 1355.1 mm2
M42 intake port area: 1279.89 mm2

So if those values in document are correct, S42 has only 5.8% larger port!

Someone (swiss?) has to measure the S42 ports to be sure.

yes. i think i have to. due to the high demand..!

[swiss318is]

only 5.8% ? thats still a lot...!!

[Boyracer]

To continue the port dimensions discussion, I have S50B30 ITB's and from those you can see that S50B30 (from E36 M3) and M42 intake ports are precisely same in dimensions.

M3 3.0 puts out 95.3 hp / liter. To scale that to our 1.8 liter displacement we should be good for 171.6 hp with same port area.

The problem is that we only have 33 mm intake valves while S50B30 has 34 mm (S50B32 had 35 mm) so we have less flow. But valves can be always changed to larger

[swiss318is]

as i remember the s42 has 35mm outlet valves too...
i think the power of the s42 is a sum of the 2l displacement, low friction parts, high cr, high rpm due to titanium valves and springs.., big valves..., insane cams, solidlifters, the 8 fuelinjectors on the quillotine itb's and the better flow of the air into the cylinders..!

bigger inlet ports arent always better.. they are slower.. thats perhaps the reason why the inlets are only 5.8% bigger than stock?! the air can flow with more speed..
another reason why this engine has "nearly" no torque and no power in the lower part of the rpms

[swiss318is]

its christmas time... so complete your whish list below.. quote it and go..!

1. volume of the chambers
2. volume of intake and outlet
3. material of the valve inserts and the valves
4. weight reduction of the head?
5. pics from under the car
6. why are there caps between valveguides and head
7. cylinder head cover ventilation..
8.
9.
10.
11.
12.

[Boyracer]

Originally Posted by swiss318is

bigger inlet ports arent always better.. they are slower.. thats perhaps the reason why the inlets are only 5.8% bigger than stock?! the air can flow with more speed..
another reason why this engine has "nearly" no torque and no power in the lower part of the rpms

Yes, too large and you lose flow velocity which hurts cylinder filling. But mere 5.8% increase in area is quite small when you think that S42 produced well over twice the power of M42

But it really seems that even stock M42 ports have plenty of spare capacity, you just need get bigger valves (and intake manifold) to use those stock ports to fullest.

Of course mild porting and smoothing of casting/CNC machining imprefections of intake port do help but they might not be absolutely neccessary until you are closer to 180-200 hp.

[RouteZeroDesign]

I <3 this thread

I think i can delete a few of these questions off the list

3. material of the valve inserts and the valves?
Beryllium for the Valve inserts and Titanium for the Valves

6. why are there caps between valve guides and head?
Titanium valves need extra cooling because titanium has a lower melting point than steel. Therefore Beryllium valve inserts are used (Beryllium 25 intake, Beryllium 3 for the exhaust) Two different types of Beryllium are used because the exhaust valve seat needs extra cooling, therefore it uses a higher percentage of Beryllium in the exhaust valve than it does in the intake.
Would you be able to verify the percentages?
The most common ratio ive seen is 98% Cu Intake, 97% Cu Exhaust)

7. cylinder head cover ventilation..
The s42 doesnt have a valve cover breather. It uses a dry sump pump which creates a vacuum in the crank case( Another reason why it makes so much power per litre).
Dry sump systems like that dont need a breather because any oil vapour is sucked down into the dry sump pump and on into the oil tank. The Tank itself has a breather tank which is used to seperate out any air from the oil.

Il post up my wish list later on, im heading out now

[nuvolarossa]

damn, I was missing this thread with pics

i'll do my wish list soon, as now I'm zooming your pics

thank you friend!

[swiss318is]

i found some pics of the 320i stw... the pics on the first page of this thread are from this car...

[RouteZeroDesign]

This thread is what makes me torn between the f20c and the m42/44.

There are so many factors to consider...on the plus side, if i stay m42/44 its keeping it bmw...which is a major plus.

Thanks for all youve done swiss, if it wasnt for you my mind would already be set on the honda engine

[hoevesruperd]

white race cars rule!!
irish friend, you should keep it all bmw, honnestly.
put the money you have for the f20c into parts for the m42
there is, imo, more pride to building an engine than to swap a better one

[beegeezy]

Originally Posted by hoevesruperd

white race cars rule!!
irish friend, you should keep it all bmw, honnestly.
put the money you have for the f20c into parts for the m42
there is, imo, more pride to building an engine than to swap a better one

[RouteZeroDesign]

^lol

hoevesrupred-
Thats what im starting to feel, there is no such thing as a free meal.

The s2k engine and ancilaries is going to cost me €3000 + €1200 for a standalone ecu.....and then on top of that there is custom mounts, exhaust manifold, exhaust system, fuel pump, driveshaft......and suddenly my original plan of saving money is gone.
And thats all before telling my insurance company and watch as they put my premium through the roof.

I may have to change my mind, and stick with the m42/44.....i guess il start another thread tommorow when im in college.....speaking of which, its now 3:20 am and i have to be up at 7:15 am.....its okay, we get to play with the dyno tommorow

[hoevesruperd]

i apologize for my actions.

[beegeezy]

Originally Posted by hoevesruperd

i apologize for my actions.

Just dont let it happen again...


jk

[swiss318is]

Originally Posted by hoevesruperd

white race cars rule!!

thats a FACT.. all racing bmw's from the factory have been, are and will FOREVER be WHITE!!!!! AND THEY REALLY RULES!!!!! because that was the color of all german racecars at the beginning of racing in the 19th and 20th century!! as red was the color for ferrari, alfa-romeo and others of italy!!and green for the british ones!!!to be continued...

NOBODY thinks about racism and black people saying a white car rules!!and so dont start that STUPID FXXXING SHIT about racism in my thread..!!nobody has to apologize for saying a WHITE RACE CARS RULES!!!! its all about the S42 ENGINE IN A WHITE 320i STW!!!!! not about racism and other or wrong colors or shit like that...!!!
i have friends with other colors of skin.. and they drive white cars too.. same as i do!!theres no problem!!only if you are looking for one

i am PROUD OF MY WHITE RACECAR!!!!!!!!!!!!!!!!!!!!and will always be...!!!!!!

be cool!!and dont be paranoid...

BEEGEEZY REMOVE THAT PIC FROM MY THREAD!!!!!!!!!!!!!!!!!!!!!! and no discussion!!!

MY THREAD IS DEFINITELY THE WRONG PLACE FOR ACCUSATIONS ABOUT RACISM!!!!