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Author Topic: The S42 Race Engine !!!!  (Read 163137 times)

swiss318is

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The S42 Race Engine !!!!
« Reply #60 on: April 07, 2008, 10:01:43 AM »
valve guides...

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swiss318is

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The S42 Race Engine !!!!
« Reply #61 on: April 07, 2008, 10:02:30 AM »
the inside of the engineblock is polished...

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swiss318is

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The S42 Race Engine !!!!
« Reply #62 on: April 07, 2008, 10:03:00 AM »
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swiss318is

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The S42 Race Engine !!!!
« Reply #63 on: April 07, 2008, 10:04:03 AM »
we didnt find the cams, the camcarriers, the hydros and the valves... so i have to go once again... ;-)
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Boyracer

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The S42 Race Engine !!!!
« Reply #64 on: April 07, 2008, 10:18:07 AM »
You da man!!! :eek:

Do you know if this cylinder head is as prepared by BMW Motorsport or has it been reconditioned earlier? It seems that one cylinder has somekind of insert on inside of valve guides while they are missing on others. On same cylinder the valve guides do not perfectly fit intake port shape.
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swiss318is

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« Reply #65 on: April 07, 2008, 10:25:16 AM »


on the right one the head was broken and rewelded, so thats the reason why the two valve seats are missing...

the head was originally prepared by bmw motorsports... but then redone a couple of times...

i have no idea why the guides doesnt fit perfectly in the head... you see that almost on every cylinder intake and outlet...
« Last Edit: April 07, 2008, 10:28:57 AM by swiss318is »
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swiss318is

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« Reply #66 on: April 07, 2008, 10:38:43 AM »
before the car was sold to switzerland... it was in yugoslavia.. here in switzerland the new owner fully restored the car and removed all the paint from the body.. it was pink or rosa when it arrived in switzerland.. :-) and under that it was yellow..
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RouteZeroDesign

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« Reply #67 on: April 07, 2008, 11:16:48 AM »
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 :)

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

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

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.

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

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The S42 Race Engine !!!!
« Reply #68 on: April 07, 2008, 11:23:43 AM »
Sorry for the double post but

Swiss or anybody else for that matter.
Do you know what material the s42 valves were made from?
Because if they are made from Titanium then the valve seat inserts (not to be confused with the valve guides) arent bronze, they are made from beryllium copper.
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Boyracer

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The S42 Race Engine !!!!
« Reply #69 on: April 07, 2008, 12:06:16 PM »
Quote from: RouteZeroDesign;46326
Sorry for the double post but

Swiss or anybody else for that matter.
Do you know what material the s42 valves were made from?
Because if they are made from Titanium then the valve seat inserts (not to be confused with the valve guides) arent bronze, they are made from beryllium copper.


You had choice of either titanium or steel valves, atleast in 1995 season :)

Based on valve material you then had diferent springs etc. But I think valve seat material were same for both.
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RouteZeroDesign

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« Reply #70 on: April 07, 2008, 12:35:32 PM »
Yeah it must be beryllium copper then.
The reason for using its is because titanium valves need more cooling than stainless steel valves. The cooling of the valve is mainly done through the valve seat and beryllium is much better at this that the standard inserts. They use Beryllium 25 (98% copper) for the intake seat and beryllium 3 for the exhaust seat ( 97% copper)

Id love to run Ti valves and Beryllium seats but they wear very quickly and im not sure how suitable they are for road use.

BTW: i just noticed that ive only posted here 16 times, even though i check the website nearly every day....odd!
« Last Edit: April 07, 2008, 12:39:49 PM by RouteZeroDesign »
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strypt

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« Reply #71 on: April 07, 2008, 03:16:23 PM »
Awesome! Thanks alot! :)
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swiss318is

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The S42 Race Engine !!!!
« Reply #72 on: April 08, 2008, 03:40:23 AM »
Quote from: RouteZeroDesign;46325
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..

Quote from: RouteZeroDesign;46325
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...

Quote from: RouteZeroDesign;46325
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??

Quote from: RouteZeroDesign;46325
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..

Quote from: RouteZeroDesign;46325
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..
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colin86325

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The S42 Race Engine !!!!
« Reply #73 on: April 08, 2008, 08:20:59 AM »
Outstanding pics, keep them coming!
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RouteZeroDesign

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« Reply #74 on: April 08, 2008, 05:28:23 PM »
Quote from: swiss318is;46389
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.


Quote from: swiss318is;46389
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.


Quote from: swiss318is;46389

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:eek::eek:
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.


Quote from: swiss318is;46389

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?
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