Author Topic: Yet Another stroker M42  (Read 67755 times)

RED E30

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Yet Another stroker M42
« Reply #15 on: November 10, 2006, 10:31:29 PM »
Awesome sounding project.  Could you please give me some more info on how you went about converting to a mechanical valvetrain?

romkasponka

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Yet Another stroker M42
« Reply #16 on: November 11, 2006, 05:10:14 AM »
where did you get solid lifters, are they from other stock engine?
« Last Edit: November 11, 2006, 05:12:22 AM by romkasponka »
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D. Clay

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« Reply #17 on: November 11, 2006, 05:12:48 PM »
Just have to know how much an M47 crank costs and how much it increases stroke and displacement by itself. Were M47's ever available in the
US? And last but not least - what is a "short shifter (welded by romkasponka)" Perhaps a pic? I've stolen every good idea I ever had.

cecotto

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Yet Another stroker M42
« Reply #18 on: November 12, 2006, 02:12:33 PM »
Quote from: RED E30;13597
Awesome sounding project.  Could you please give me some more info on how you went about converting to a mechanical valvetrain?


I think i'll get the cylinderhead next week, or very early next week-again. Then i'll shoot some pics of all the parts.

Quote from: romkasponka;13615
where did you get solid lifters, are they from other stock engine?


The head is at Catcams at the moment, where they have been measuring things out for the conversion. So all valvetrain parts will be Catcams, except for the valves themselves which is stock.
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Steffen Otto Jensen
E30 318is
E30 M3

Febi Guibo

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Yet Another stroker M42
« Reply #19 on: November 19, 2006, 01:46:40 PM »
sorry, I'm late to this thread... this sounds sweet! did you consider overboring out to 88mm?

keep us updated!
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cecotto

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Yet Another stroker M42
« Reply #20 on: November 19, 2006, 06:33:28 PM »
Hi Febi.

88mm you must be mad!!!  Well i dont know if it can be (safely) done. So it's wrong of me to be calling you mad. :-)

But no i haven't considered this. I did think about 86.5mm. But as it's also stroked the rod-ratio gives more sidewall forces. And i'm building it for high RPM (Double RPM and forces are squared!!), so i chose to play it on the safe side. I woulden't like to see cylinder distorsion as a result of getting "displacement greedy" thats power-robbing.

I am aware of the fact that rod-ratio wise we're better off than the US M3 3.2L (135/89.6=1.5) Mine will be: 140/88=1.59. I haven't analysed what this means in raw numbers. But for those interested Gustave on http://www.e30m3performance.com has a spreadsheet that will show this graphically. (BTW. the S42 has 145/85=1.7)

I will keep the progress updated, it's kind of standing still at the moment. I need to drop the block of at the machine shop. And decide on some rods. Also i hope to soon get the head back. Once these things has fallen into place i'm ready to start assembling.. (it'll be months before it will be started up :-( )

Febi, i've both read about your engine, and seen the video from Metric mechanic. It sounds like a well built engine, but i think we're a couple of people who would like to get some more technical details about it. Im interested in all the info i can get on whats people are doing.
« Last Edit: November 19, 2006, 06:38:08 PM by cecotto »
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Steffen Otto Jensen
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cecotto

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Yet Another stroker M42
« Reply #21 on: November 24, 2006, 08:47:28 PM »
Quote from: cecotto;14091
........ but i think we're a couple of people who would like to get some more technical details about it. Im interested in all the info i can get on whats people are doing.



I just saw Metric Mechanic has published a brochure about their engine:
http://www.metricmechanic.com/pdfs/M42_M44_Engine_Series.pdf

I haven't seen it before..
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Steffen Otto Jensen
E30 318is
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nickmpower

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« Reply #22 on: November 24, 2006, 09:59:48 PM »
have you decided what rods you are going with? i think i may just use m44. I dunno.... Those 360 degree bearings MM has seem like a good idea, but after looking at the m47 crank it looks liek they arent nessary because the crank has 2 holes in the main bearings

cecotto

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Yet Another stroker M42
« Reply #23 on: November 24, 2006, 10:32:16 PM »
Quote from: nickmpower;14399
have you decided what rods you are going with? i think i may just use m44. I dunno.... Those 360 degree bearings MM has seem like a good idea, but after looking at the m47 crank it looks liek they arent nessary because the crank has 2 holes in the main bearings


Hey Nick

I was very much focused on some Verdi rods, but they are pretty hung up at the moment. So it woulden't be until early feburary before i could get some rods. So i'm weighing my options, something needs to happen..  I even talked to Eagle, They're 100% sure the M42s got 135mm rods. And wont make 140mm. Arrows are too expensive. But i'm talking so another manufacturer who can make them for me.

About the mainbearings being bored all the way through. I knew that, but actually didn't think of that when i saw what MM did, good observation!. I'm sticking with the OE setup anyway. Allthough the S42 (I like comparing everything to that) did have a similar setup to MM's. I think I'll be allright anyway. Also i'll be using an oil-restrictor. Hope that will prove a good decission.

There's no question about the MM engine is a well thought out piece of machinery. Which probberly will last a long time, but i think at the extra cost one could make a mid-life light overhaul/inspection and still save some money. And in the process see if your thoughts and decissions has been sound or not. Learning something in the process too, thats even more valuable.

A thing that keeps nagging me is that i have never read anything good about using slitted pistons in a performance engine. But it seems MMs pretty happy about them. I have only read that the slitting weakens the piston, and i've seen images of wrecked pistons as well. But i guess someone could show images of non-slitted failed pistons also.
« Last Edit: November 24, 2006, 10:37:34 PM by cecotto »
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Steffen Otto Jensen
E30 318is
E30 M3

Gizmo318i

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Yet Another stroker M42
« Reply #24 on: November 25, 2006, 07:31:35 AM »
I can say with personal experience that you will be blown away with the outcome of your motor. The torque is insane!!!

...stuff all that "swap in a 6cyl" bullshit...2044cc M42 6speed 3.91LSD. *Turbo coming soon* Achtung! Auspuff Flammen!

cecotto

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Yet Another stroker M42
« Reply #25 on: November 29, 2006, 11:25:00 AM »
Okay,

Recieved some parts today, here are some images:
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Steffen Otto Jensen
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E30 M3

nickmpower

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« Reply #26 on: December 04, 2006, 08:34:15 PM »
have you decided on rods? also, how do you adjust those lifters?

silverblades181

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« Reply #27 on: December 05, 2006, 12:39:24 AM »
sweet. I need more details on those parts! Whats the spec on those cams? Double valve springs and solid lifters? where did you get all that?

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cecotto

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Yet Another stroker M42
« Reply #28 on: December 05, 2006, 02:41:40 AM »
Quote from: nickmpower;14986
have you decided on rods? also, how do you adjust those lifters?


Hi Nick.

Check out those tiny caps, they are placed on the valve stem, and are available in different thicknesses for the adjustment of the valve clearance.

This is a very lightweight approach, but also very cumbersome to adjust. you have to pull the cams...

The M3 has large shims on top of the lifters, as you can imagine those are quite a bit heavier. But has the advantage of being easy to adjust if you have the special bucket depresser..

I'll have to get back to you on the rods, i wont make a decission untill January.  I might get some inspiration at the PRI in Florida next week, i'm really looking forward to that!
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Steffen Otto Jensen
E30 318is
E30 M3

cecotto

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Yet Another stroker M42
« Reply #29 on: December 05, 2006, 02:42:19 AM »
Quote from: silverblades181;15000
sweet. I need more details on those parts! Whats the spec on those cams? Double valve springs and solid lifters? where did you get all that?


Thanks, Please read the thread, Alle details on the parts are present  :-)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Steffen Otto Jensen
E30 318is
E30 M3