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Author Topic: M42 race engine  (Read 59699 times)

dsm2002

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M42 race engine
« Reply #45 on: April 30, 2011, 01:08:18 AM »
No worries. Happy to share the figures.
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MLM

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« Reply #46 on: May 04, 2011, 04:35:49 AM »
what are you doing for lifters?

Found these http://www.bar-tek-tuning.com/BMW+Hydrostoessel+SCHRICK.htm

May be a better option than using VW parts
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dsm2002

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« Reply #47 on: May 06, 2011, 09:23:01 AM »
Flow figures:





The head compares well to the S14 Evo head (see Link), but it would be unwise to compare the figures for the M42 and S14 Evo too closely - different flow testing machine, different temperature, etc.

The head porter said if everything was optimised, cams, compression, extractors, fuel, etc, the head would be good for about 280hp or so. There is no way I'd be able to achieve anything like this. Lack of the readies $$$$.

He also said the standard M42 is quite good ... similar to other stock 2 litre 16v heads he's played with (mostly Nissan), which is notable given that it's on a 1.8 litre.
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dsm2002

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« Reply #48 on: July 05, 2011, 07:58:37 PM »
Small update: M42 Carillo goodness ...



Weight each = 503 grams!
« Last Edit: July 06, 2011, 01:03:23 AM by dsm2002 »
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romkasponka

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« Reply #49 on: July 06, 2011, 11:13:07 AM »
What was the price?
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E30 318is M42
E36 318is M44

dsm2002

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« Reply #50 on: July 06, 2011, 06:24:43 PM »
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romkasponka

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« Reply #51 on: July 07, 2011, 03:53:46 AM »
.
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E30 318is M42
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fabe

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M42 race engine
« Reply #52 on: August 13, 2011, 10:33:04 PM »
Damn.. that's a lot of blood, sweat and $$$ going into this build....

My wishlist set up is 86 x 81 (with lightened stock crank)..

And yes, the M42 ports are bigger than average for a 1.8L motor.. it's a gem of an engine... powerful and hardy even in stock form... Mine dynoed at 126rwhp. it's a fun car to drive especially on the B-roads.
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Massimo

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« Reply #53 on: August 28, 2011, 10:34:39 PM »
Interesting build pretty much what I hope to do in a few more years. I would estimate your engine outputting about 260-270hp on the basis that you will have around 15hp/rpm/L which should be a reasonable number considering the s42 had 18hp/rpm/L and the stock M42 has about 12hp/rpm/L.

Anyways I see that you want to run possibly 87.5mm pistons that seems ambitious, that is below 4mm of thickness between cylinders. Even manufactures of wet sleeves don't recommend or make walls thinner then 4mm and I am sure modern wet sleeves are stronger then M42 walls. I would like to know what your thoughts are on this.

What hardware are you running on the bearing caps? ARP? Do you see the need of strengthening the caps e.g. bearing cap cradle? I ask this because I want to build mine up on the stock crank and 86mm custom pistons but want to run it up to 9000 possibly 9500rpm.

Well none the less this is a great build and can't wait to see the end results. If you are ever in Adelaide with the car drop me a pm ill need to check it out.
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romkasponka

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« Reply #54 on: August 31, 2011, 03:53:59 PM »
Quote from: Massimo;106415

What hardware are you running on the bearing caps? ARP? Do you see the need of strengthening the caps e.g. bearing cap cradle? I ask this because I want to build mine up on the stock crank and 86mm custom pistons but want to run it up to 9000 possibly 9500rpm.


Forget 9000 without dry sump, I wouldn't recommend more than 8500.
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E30 318is M42
E36 318is M44

Massimo

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« Reply #55 on: August 31, 2011, 06:22:09 PM »
Quote from: romkasponka;106469
Forget 9000 without dry sump, I wouldn't recommend more than 8500.


Yes I already thought of that how I will link to together is another story but I am sure it can be done. Though will be a long term engine build due to the high $$$ envolved.
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boostedbmw

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Advice please
« Reply #56 on: September 08, 2011, 05:37:24 AM »
I am so glad i found this thread and site. I am just starting down the same road with an M42 i have aquired to replace my tired M10 in my track car.  Any advice, good, bad or other you can give before i start handing out wad loads of $$$$(that i dont have).  So far i have a 90's M42, gearbox and loom from a 318is for $250, maybe a M47 crank for free, and a MoTeC M800 ECU.
My E30 currently has a 6 point cage, full Ground Control suspension and lightened to 980kg. I also have a 4.11:1 8 bolt LSD to go in when i do the swap.
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dsm2002

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« Reply #57 on: February 02, 2012, 07:22:40 AM »
small update :D

CP goodness:

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wannam42

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Very light!
« Reply #58 on: February 21, 2012, 04:30:09 AM »
363g including the pin is very light considering s52 pistons with pin and rings weigh 433.5g (see here).

Would you mind posting the weight with pin and rings?

Would you mind going posting the piston build specs too? :D
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MLM

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« Reply #59 on: March 19, 2012, 06:04:34 PM »
Nice, Who did you go through to get the pistons and rods?

Did you have to spec valve clearance on the pistons?
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