Author Topic: Yet Another stroker M42 (Read 67801 times)

cecotto · « **on:** October 30, 2006, 01:56:33 PM »

After having spent the last ~18 months collecting parts, planning and changing my mind over and over again about where to take this rebuild. I�m finally focused and have a clear mindset on where I�m heading.

I started out wanting to build a stroked M42 maybe also some mild sports cams and that was supposed to be IT. But inside I knew that I really wanted to do more. Well a lot more. But the 318is being my daily driver sort of made me more or less conservative on my decisions.

The first thing I ordered was the cams they were ordered for hydraulic lifters, but once they were finished and I had to pay for them I realized that this wasen�t what I really wanted. So I asked the manufacturer if I could still change my mind on the cams�. They said Okay and I went ahead having them produce a set of cams for mechanical operation. The head is being converted to a shim-under setup and will be designed to be able to rev all the way to 8500 rpm.

The second thing I ordered was the pistons, they are JE-Pistons. With a compression ratio of 11:1. I spent months thinking about the CR. And finally decided on this.. Got them last Friday.

I�ve also got the M47 88mm crank, this was actually the first thing I got my hands on and was what sparked it all.

I think this is going to be the week where I�m ordering some Arrow Connecting rods, with these I think I�m also going to have a solid bottom end.

The engine will also have a set of dBilas individual throttle bodies, I really got a very good deal on these used.

I�m planning to be installing a Haltech E11v2 ECU which is kind off overkill, but it�s good value for the money. And will be able to control up to 12 cylinders for future projects. + it has loads of features.

As a summary:
�   Stroke = 88mm
�   Bore = 86mm
�   Compression = 11:1
�   Displacement = 2043ccm (~14% increase)
�   Intake = dBilas ITB
�   Valve actuation = Shim under, mechanical
�   Cams: 273� Intake (10.95mm lift, 2.25@TDC)
�   Cams: 266� Exhaust (10.95mm lift, 1.7mm@TDC)
�   Engine Control = 89% decided on the Haltech

The cams are specified for Rally & Cross, but the pistons are made for accepting full race cams. So if the cams turn out to be too conservative I�m planning to at a later stage swap them out.

For those that are thinking, this engine are gonna blow sooner or later.. I'm not building it to last 200.000km anyway. I'll be happy with about 75.000 - 100.000 km's before the first rebuild..

BTW.
1. I'm not into forced induction so please don't bring up the DASC
2. I'm into high reving 4-cyls. so please don't bring up any S5x engines.
They're also illegal to install in my car so this is not an option.

romkasponka · « **Reply #1 on:** October 30, 2006, 02:11:19 PM »

I want ITB too

dude8383 · « **Reply #2 on:** October 30, 2006, 02:15:44 PM »

what! that sounds like an insane setup.

Sam (Febi Guibo) has a similiar setup.

I'm going to be going with a 2cc increase as well.

asubimmer · « **Reply #3 on:** October 30, 2006, 03:03:46 PM »

awsome, no worries. noone here will try to get you to go s5x

2002maniac · « **Reply #4 on:** October 30, 2006, 03:19:09 PM »

That should make very good power. Nice parts list!

dude8383 · « **Reply #5 on:** October 30, 2006, 03:49:26 PM »

how much is this running you btw...if you don't mind asking?

cecotto · « **Reply #6 on:** October 30, 2006, 03:59:58 PM »

Quote from: dude8383;12926

how much is this running you btw...if you don't mind asking?

I'll know when i'm finished...But i have pretty much decided not to keep track.

But i'm in the buisness so a lot of it is pure netto prices, and other stuff has been given to me. Also some used parts which is cheap.

But it's expensive no question about it... A project like this can't be realised by peanuts ;-)

MustPayDaddy · « **Reply #7 on:** October 30, 2006, 06:37:45 PM »

got any pics of your itb setup?

if you got your hands on an m47 crank that easily, maybe you should try goin into the business of tracking down and selling them to some members here :rolleyes:

dude8383 · « **Reply #8 on:** October 31, 2006, 09:38:38 AM »

Quote from: cecotto;12927

I'll know when i'm finished...But i have pretty much decided not to keep track.

But i'm in the buisness so a lot of it is pure netto prices, and other stuff has been given to me. Also some used parts which is cheap.

But it's expensive no question about it... A project like this can't be realised by peanuts ;-)

haha yeh i understand...i decided not to count as well but i was looking for a rough estimate..

can you get those "netto prices" for me??

cecotto · « **Reply #9 on:** October 31, 2006, 11:11:05 AM »

Quote from: MustPayDaddy;12945

got any pics of your itb setup?

if you got your hands on an m47 crank that easily, maybe you should try goin into the business of tracking down and selling them to some members here :rolleyes:

I'll try and get you a couple of images of the ITB setup, later this week.

The parts aren't in my own garage...

cecotto · « **Reply #10 on:** October 31, 2006, 11:19:56 AM »

Quote from: dude8383;12998

haha yeh i understand...i decided not to count as well but i was looking for a rough estimate..

can you get those "netto prices" for me??

I think around 5-6000 USD will be about right.. But i'll probberly never know for sure :-D

BTW. It's a nice collection of similar projects that are going on on this site, i think it's great this site has been created!

I've read a lot of threads on bimmerforums, and they dont seem to appreciate our engines too much. And i was getting sick of seing the same replies, Why not S5x or DASC??? I Haven't contributed much there though.

dino245 · « **Reply #11 on:** October 31, 2006, 11:33:09 AM »

I see from your profile that you have an E30 M3, I was wondering what your impression is of the two cars, 318IS and M3.

I always loved the M3 of that era because of its race heratige and have often thought of braking down and buying one but have not because I love my little 318IS. Also the lighter weight of the 318IS is atractive on the track, easier on tires and brakes.

cecotto · « **Reply #12 on:** October 31, 2006, 12:01:49 PM »

Quote from: dino245;13020

I see from your profile that you have an E30 M3, I was wondering what your impression is of the two cars, 318IS and M3.

I always loved the M3 of that era because of its race heratige and have often thought of braking down and buying one but have not because I love my little 318IS. Also the lighter weight of the 318IS is atractive on the track, easier on tires and brakes.

I think im on the third year owning the M3, it's always been a dream for me to own one. And it feels great to have realised this dream. But actually i dont drive it much, only during nice and dry weather. I have brought it down to the N�rburgring a couple of times, but i've never been happy about tortureing it round the track. And i'm not a great driver anyway....

The 318is on the other hand, i think i've had this for close to 7 years. and i have driven close to 120.000km in it so far. So i know it pretty well, and i'm not too concerned about the cosmetics about it. So i feel more spirited and free driving this. Having recently retrofitted a complete M3 suspension on the 318is i actually sometimes feel its better handling than the M3.

The suspension on the M3 is a KW Competition coilover setup with very stiff springs, so it's not comfortable on the streets. But on highspeed backroads it feels quite good. So after driving the M3 i often say to my self, No way the 318is is as good as this..

So to sum it all up.. I think with some good suspension components you can have a lot of fun with the 318is. Theres actually no need for absolutely retrofitting an M3 suspension... I was only lucky to come across the front struts for cheap.. and made the decission.. Ended up being too expensive as i had to buy a lot of parts new... But wow the braking is very precise and feels much better than the 2cm smaller brakes on the non M E30

dino245 · « **Reply #13 on:** October 31, 2006, 12:21:02 PM »

thank you for the info, I dont feel so bad now. I like being able to beat a car on the track and not worry about it. I live in snow country so I too would be hesitant about driving the M3 which would make owning it a bit of a burden. I love my 318is.

cecotto · « **Reply #14 on:** November 10, 2006, 09:56:19 PM »

Just as a quick update Ive made the final decission on the cams they're a bit hotter that first advertised. I've made myself a comparison sheet, which i think helps me some. In seing the cams in relation to similar, and other cams.

As i said, i've removed the hydraulic lifters in favour of mechanical shim under buckets. This makes the moving mass ~60 grams lighter than a standard S14B20 per. valve. Thats a valvetrain thats ~960grams lighter in total(Compared to the S14B20).

I bought a S42 cylinderhead oilrestrictor too. which will be installed in the block to restrict oilflow to the cyl.head. And keep the oil in the bottom end, where it's got a bigger job to do.

I'll have to get a S42 main bearing too, i want to see what they did to those in relation to oil ways. And replicate this on the standard mainbearings to save money. The conrod bearings will just be standard OE, no need for mods there i think.

The block will be bored within the next two weeks, so its getting closer to assembly time.... Forgot.. I'll have to save up for some rods, and an ECU.. :-(