Author Topic: Yet Another stroker M42 (Read 67771 times)

fiskerendk · « **Reply #90 on:** May 24, 2007, 03:08:43 PM »

However what about the Harmonic Balancer (at the front of the engine) Heard bad things about that with high revs.

nickmpower · « **Reply #91 on:** May 24, 2007, 03:54:43 PM »

you dont need 360 degree bearings with the m47 crank

cecotto · « **Reply #92 on:** May 24, 2007, 08:19:03 PM »

Quote from: fiskerendk;26490

However i properly want to spend about 100.000 DKK as i already did with my M20 engine. So thats almost the price tag. Im not going to take the cheapest way if another is better. However i thinked about the S42 crank becouse of the 85mm and not to worry about high rpms.
But again it should be posible to get a high rev 88mm stroke engine. And then just use 86mm pistons.

Then maybe just go for the:

Block:
M42/M44 Block
M47 Crank 88mm Stroke
Custom Con.Rods
Custom 12:1 Pistons
Main Bearings with 360 degree oiling grooves
Rod Bearings

Head:
Ported and Flowtested by Poul Heikendorf again
Custom 6mm valves +1mm oversize
Mechanical Lifters
Upgraded springs and retainers
292 degrees cams or simular

Does this sound like a good choises then?
Im only at the early stages and comparing some different posibilities.

Sounds very good to me.

About the vibration damper, i've read that too. But i have yet to see any posts anywhere with somebody who experienced this. I think it's just some remark by someone that being retold again and again. And this way become a fact. However i dont know my self, I just dont have the habbit of taking internet chatter too serious.

I will bring a spare with me to start with though :-)

BTW. The S42 crank doesn't use a damper. It's just got a very tiny pulley, and four impulse arms for the ECU. I think about 150-grams would be the max weight of it.

BTW-BTW. I think Nick is right about the 360-degree oil groove, the main bearings on the M47 crank is bored straight through. So theres always a oil inlet to the rod bearing at the groove.

Febi Guibo · « **Reply #93 on:** May 24, 2007, 10:01:18 PM »

Quote from: fiskerendk;26497

However what about the Harmonic Balancer (at the front of the engine) Heard bad things about that with high revs.

my stock balancer is fine up to 7800 rpms...

there is a post here from a very nice guy, Don Duncan
http://m42club.com/forums/showthread.php?t=316

it sounds like you are building a monster engine... check out his site for some info:

http://www.gttechnic.com/catalog.html

fiskerendk · « **Reply #94 on:** May 25, 2007, 12:19:41 AM »

And ofcouse throutle bodies and a Wolf3d engine management are goint to be used. So the intake should be ok for high revs.

Do you think the pulley for the S42 will fit into the crank?
Couse im hoping on a 8000-8500rpm or so.

Febi > Yeah i been around that page for some times. And its very nice engines they made. 260hp from a 1.8L with carbs damn.

What is your 7800 rpm engine outputting? And what are the specs?

cecotto · « **Reply #95 on:** August 10, 2007, 10:01:36 AM »

Okay finally my rods has arrived, here is some images.

The total weight of a stock rod including bolts = 620g
The total weight of a new rod including bolts = 506g
--------------------------------------------------
Total difference = 114g pr. rod

pungky29 · « **Reply #96 on:** August 18, 2007, 11:00:25 AM »

Sorry, I'm too late in joining this thread
Just an idea, why don't you use the M47N (M47TU) crankshaft?
It has 90mm stroke compare to M47 which has 88mm stroke, both crank has similar design
By using existing piston and 135mm rod (M42, M43 & M44 has 140mm), you'll get 1995cc and 1.5 conrod ratio
You can also use 86mm diameter S50 B30 Euro M3 piston and you'll end up with 2091cc

cecotto · « **Reply #97 on:** August 18, 2007, 01:37:11 PM »

Quote from: pungky29;31890

Sorry, I'm too late in joining this thread
Just an idea, why don't you use the M47N (M47TU) crankshaft?
It has 90mm stroke compare to M47 which has 88mm stroke, both crank has similar design
By using existing piston and 135mm rod (M42, M43 & M44 has 140mm), you'll get 1995cc and 1.5 conrod ratio
You can also use 86mm diameter S50 B30 Euro M3 piston and you'll end up with 2091cc

You're right, this would be possible.

This configuration:
* M47N 90mm crank
* 135mm Rods
* Standard pistons.

Would have the piston sit 0.36mm below the cylinder deck.
This is not good for your squish effect. The stock M42 has
the piston protrude 0.15mm above the cylinder deck

Also you have 9mm more stroke with the standard piston,
and combustion chamber, which compresion ratio (CR) do you
think this would yield ? Well you could probberly machine
the pistons to lower the CR. But this would weaken the piston
crown, and i would think that as theres a lot of material removal
thermal problems might arise. As the "heat sink" capabilities would
not be as good with less material. I would not be comfortable with
this during sustain�d high load. Well these prblems with the piston
might just be in my head. But then again they might not.

About the crank, sure it could be made to fit. As the M47 it
needs some machining. But the shank is not the length it needs
to be so this would have to be lenghtend. So the shank would
end up being a two piece design. I dont like that. Try and look
at the images in Metric Mechanics M42 booklet. You'll see what
i mean there.

All in all i think the M47 crank, 140mm rods, custom pistons are
the best way to go. Simple crank modification, together with
good rod ratio. And with custom pistons you will have the luxury
of being able to select your CR.

Sorry if i come off as being defensive, i'm just explaining the pro's and con's.
as I see them..

cecotto · « **Reply #98 on:** August 08, 2009, 11:31:15 AM »

Up for sale:

I have lost interest in the project, and has shifted my attention to other things. So I have decided to sell off what I have accumulated.

Here you have a list:
* Crank, All modified and ready to go (Included: Vibration damper + attachment parts all balanced with the crank)
* Pistons, Custom JE
* Rods, Catcams with Northbridge Motorsport NM88 bolts
* Throttle bodies, dBilas purpose built.
* Complete cylinderhead, with the cams, lifters and all. (Mechanical operation) All shimmed up and ready to go. With a collection of spare shims.
* Complete new chain, guides nuts and bolts
* Water pump, oil pump
* Spare Cylinderhead with 6mm valve stems.
* Engine block, honed and ready to be assembled.
* 86mm Headgasket (But not complete gasket set.)
* Oilpump housing to engine block gasket.
* Rod bolt stretch guage (ARP), for precice and accurate tensioning of the critical rodbolts.

I have not yet thought of a reasonable pricing. But I will take offers. Preferably on the whole lot.

I have shared many details about the parts in the thread. So have a look through it instead of asking too many questions thats already answered in detail.

I will ship all over the world, but will only calculate shipping costs when I have a serious buyer. But should not be too redicolous if the engine block is omitted

Thanks for your time.

-Otto

toddnos · « **Reply #99 on:** August 08, 2009, 01:50:43 PM »

how much for the crank?

cecotto · « **Reply #100 on:** August 08, 2009, 03:33:04 PM »

Quote from: toddnos;76552

how much for the crank?

Hi.

I kind of think that the crank natually goes with the rods, pistons, sprocket, flange, damper and pulley.

I would like to give it a couple of months, to see if a buyer for a more complete set of parts emerges.

Also, in a couple of days i'll try and set some prices on the parts.

toddnos · « **Reply #101 on:** August 08, 2009, 04:44:59 PM »

Quote from: cecotto;76556

Hi.

I kind of think that the crank natually goes with the rods, pistons, sprocket, flange, damper and pulley.

ok,
i may be interested..

e30guydownunder · « **Reply #102 on:** August 09, 2009, 10:31:16 PM »

just posting my interest in the engine bits, when i get a second i will try catch up on the specs of all the pieces and work out if i am interested in anything.

cecotto · « **Reply #103 on:** August 10, 2009, 04:43:02 AM »

Pricing on the bottom end:

I have used this approach to set a price:

First, whats it worth if you were to purchase it new:
-------------------------------------------------------
Crank: 3920 DKR (Plus 1125.- DKR in deposit) = 5046.- DKR
Rods: 5100.- DKR (Plus 1260.- DKR in NM088 bolt upgrade = 6360.- DKR
JE Pistons, with lightweight pins (CR: 11:1): 3500.- DKR
------------------------
Total market value: 14906.- DKR (Plus sales tax)
Approx.: 2877.- USD (Plus sales tax)
-------------------------------------------------------
-------------------------------------------------------

I'm asking 8500.- DKR (Approx.: 1700.- USD) for the lot, and will include the bearings.

But the buyer will have to pay the shipping, will calculate when I have a serious interest.

Also I have a brand new ARP rod bolt streatch guage (Billet style, part number: 100-9942),
I Will include this for another 800.- DKR (Approx. 155.- USD)

HATER-PROOF · « **Reply #104 on:** August 10, 2009, 05:17:07 AM »

cecotto-I've been following your blood sweat and tears from your work and now you have to focous in another direction. I hope everything is o.k, and also hope that you can find a really serious buyer, because your involvement for this build has been a long time in it's construction stages. I must say that I respect and admire your determination on your builds.