Noob to M30's

[Good & Tight]

Hi all, just wanted to introduce myself and looking forward learning all the different types of engine codes and internal part combos and possibilities for the M30.
In searching I found a wealth of info already.

[T_C_D]

Hi all, just wanted to introduce myself and looking forward learning all the different types of engine codes and internal part combos and possibilities for the M30.
In searching I found a wealth of info already.

For your 318i? Thought you would go 24v?

You want the m30b35 cyl ead from a 88-92 735 or 89-92 535i. Almost all the bottom ends are the same with the exception of bore from 84-92.

Todd

[Good & Tight]

Hi all, just wanted to introduce myself and looking forward learning all the different types of engine codes and internal part combos and possibilities for the M30.
In searching I found a wealth of info already.

For your 318i? Thought you would go 24v?

You want the m30b35 cyl ead from a 88-92 735 or 89-92 535i. Almost all the bottom ends are the same with the exception of bore from 84-92.

Todd

Hey Todd
yeah I gave it some good thought and for the power I need the M30 will be good enough with less moving parts plus it's similar to the M10.
So far I have a set of 95mm forged flat tops and a 81 3.0/3.2 turbo block and crank, was hoping the turbo crank had the smaller crank but from what I have read it's the same stroke as the 3.5.
My thoughts would be having the smaller stroke with larger bore to rev to 8000 and around 20psi or more if it stays together
I'm searching for the B35 head and also a 265 5 speed.

[DMS]

kinda wondering what kinda turbo you'll use. You are gonna post up at E30tech right?

I'm kinda happy you turned the M30 route and I'll follow your progress with interest. Perhaps I'll steel some thoughed of your setup for my E12.

Regards.

[Good & Tight]

kinda wondering what kinda turbo you'll use. You are gonna post up at E30tech right?

I'm kinda happy you turned the M30 route and I'll follow your progress with interest. Perhaps I'll steel some thoughed of your setup for my E12.

Regards.

I'm gather parts and info at the moment, trying to locate a 80mm stroke crank. Haven't decided yet on the turbo, I have a Holset HX40 that I would like to try.

[rundatrack]

kinda wondering what kinda turbo you'll use. You are gonna post up at E30tech right?

I'm kinda happy you turned the M30 route and I'll follow your progress with interest. Perhaps I'll steel some thoughed of your setup for my E12.

Regards.

I'm gather parts and info at the moment, trying to locate a 80mm stroke crank. Haven't decided yet on the turbo, I have a Holset HX40 that I would like to try.

Holset hx50 FTW

[altus22]

Hey Todd
yeah I gave it some good thought and for the power I need the M30 will be good enough with less moving parts plus it's similar to the M10.
So far I have a set of 95mm forged flat tops and a 81 3.0/3.2 turbo block and crank, was hoping the turbo crank had the smaller crank but from what I have read it's the same stroke as the 3.5.
My thoughts would be having the smaller stroke with larger bore to rev to 8000 and around 20psi or more if it stays together
I'm searching for the B35 head and also a 265 5 speed.

Which crank do you have, the 3.0 or the 3.2? The 3.0/2.8 is the 80mm you're looking for. I've got one sitting in my driveway. Why not go balls to the wall and go for the 72mm crank from the 2500/525?

[Good & Tight]

Hey Todd
yeah I gave it some good thought and for the power I need the M30 will be good enough with less moving parts plus it's similar to the M10.
So far I have a set of 95mm forged flat tops and a 81 3.0/3.2 turbo block and crank, was hoping the turbo crank had the smaller crank but from what I have read it's the same stroke as the 3.5.
My thoughts would be having the smaller stroke with larger bore to rev to 8000 and around 20psi or more if it stays together
I'm searching for the B35 head and also a 265 5 speed.

Which crank do you have, the 3.0 or the 3.2? The 3.0/2.8 is the 80mm you're looking for. I've got one sitting in my driveway. Why not go balls to the wall and go for the 72mm crank from the 2500/525?

I have the 86mm stroke crank from the 3.0/3.2 turbo block. The 72mm would be nice but hard to find. I think a good turbo setup would be a longer rod combo with less side load against the cylinder bore.

Found this link with crank info.
http://aaron.aussiefiverdriver.com/M30%20engine.htm

[altus22]

There are some guys on the Senior Six list with b25 and b28 engines. PM me if you want their contact info.

[Good & Tight]

There are some guys on the Senior Six list with b25 and b28 engines. PM me if you want their contact info.

Have a lead on an 80mm stroke crank locally, hopefully it's in good shape, if not I will pm you.

There are some differences between the turbo block and later 3.5 blocks.

The front of the turbo block has no provision for the oil pump chain tensioner like the 3.5 and has one extra coolant hole between the cylinder bores

Turbo block



B35 block

[griffith]

Hope those main caps are numbered....if not there's a line hone in your future!

Investigate your rod options as well as there are some differences in oiling methodology between the b35 rods and earlier variants. I'd have to go dig my b30 and b35 extra rods up for photos, but I can if you're interested.

Can you also send photos of the underside of that block casting? I'm curious.

Jason

[Good & Tight]

Hope those main caps are numbered....if not there's a line hone in your future!

Investigate your rod options as well as there are some differences in oiling methodology between the b35 rods and earlier variants. I'd have to go dig my b30 and b35 extra rods up for photos, but I can if you're interested.

Can you also send photos of the underside of that block casting? I'm curious.

Jason

Yes the main caps are numbered, but I will most likely get it line bored so it's perfect.
Here's the underside turbo block

3.5 block
[/img]

The 3.5 block looks stronger with more support around the main caps, but for some reason the turbo block feels heavier, will have to weigh both to be sure.
Once I get the crank I will have a set of rods made to the pistons I have which have a compression height of1.146"

[bimmerboy]

i have b25 bottom end. Not sure how much I want to give it up though. i was really hopin to eventually make a track engine with it

[griffith]

Picked a rod manufacturer yet?

Turbo block is interesting, no oil squirters on that one. Huh... Must have been on the later model 745i's.

Jason

[Good & Tight]

Picked a rod manufacturer yet?

Turbo block is interesting, no oil squirters on that one. Huh... Must have been on the later model 745i's.

Jason

Either Pauter or Saenz.
The block is stamped 81, ah so the early blocks came w/oil squirters?

[griffith]

I don't know which had the mythical oil squirters, I would guess the later models (I was saying, ahh the later models must have had the squirters).

Jason

[Good & Tight]

Some good news, scored a 1981 2.5/2.8 engine locally which has the 80mm stroke crank

[GregATL]

I can tell this buildup is going to be good. Please document your connecting rod specs. And more on those pistons as well.

So, if I may ask, what are the numbers on the M10 these days?

[Good & Tight]

I can tell this buildup is going to be good. Please document your connecting rod specs. And more on those pistons as well.

So, if I may ask, what are the numbers on the M10 these days?

The pistons are Wiseco 95mm with a 1.146" compression height. I need to measure the deck height (it's a little over 8")
and then figure what the rod ratio will be.

The M10 is dead, never had a chance to redyno it after installing the bigger turbo ITB's and clutch. So 359rwhp is all it made on paper. Here's a link to what happened to the engine.
http://forums.bimmerforums.com/forum/sh ... p?t=849689

[GregATL]

Thanks for the link. That was quite a finish to that story. It just goes to show that head gasket failure is the preferred method of turbo engine failures. Do you think it was tuning related at all or just too much mechanical stress? I know you were pushing 26 psi when you did the 359 hp figure but what were you up to at catastrophic failure level?

[Good & Tight]

Thanks for the link. That was quite a finish to that story. It just goes to show that head gasket failure is the preferred method of turbo engine failures. Do you think it was tuning related at all or just too much mechanical stress? I know you were pushing 26 psi when you did the 359 hp figure but what were you up to at catastrophic failure level?

Mechanical stress, I really beat the piss out of that engine plus shifting at 8300 with stock rods The last 3 surviving rods were all bent and most likely have been bent for a year, it was just a matter of time.

[Good & Tight]

O.k back in the game, it's been awhile but scored good today.
A big thanks to Rennie Bryant from Redline.

Picked up two M30 a 2.5/2.8 with the 80mm stroke crank and a regular 3.5 + a 265 tranny.




E34 oil pan for the E30 chassis and 265 bellhousing.


Now for the good stuff, ported race head with titanium locks and keepers, double valve springs and Schrick cam.



also a 90 3.5 head.



Now the fun begins disassembling the engine and prepare it for some crazy boost.
I was thinking taking the spare 3.5 and setting it up in the car with the Megasquirt, fab the exhaust manifold and boost it till it pops

[Good & Tight]

Was busy this weekend and decided to set the car up with the spare engine.

Installed the E34 oil pan and twin plate clutch setup from the M10, it weighs about 14lbs.



Looks factory right?



Had to fab up some motor mounts, the after market ones wouldn't set it back far enough to my liking.



Thats it for now, the drive shaft is about 4" to long, and will start to fab up the manifold.

[Good & Tight]

Finished the manifold and test fit, slow progress but getting there

[iXer]

Looking good so far, just one question :
- Why not build the exhaust manifold to use the divided entry turbine housing to it's full potential while you're at it?
(not that turbo response will be that much of an issue on a 3.5 litre, people still complain even though their manifold isn't built right)

[Good & Tight]

Looking good so far, just one question :
- Why not build the exhaust manifold to use the divided entry turbine housing to it's full potential while you're at it?
(not that turbo response will be that much of an issue on a 3.5 litre, people still complain even though their manifold isn't built right)

Hey Mattias, I wanted to make it a true split pulse but it was just easier to make a single collector design to run the wastegate. I'll make another one if I'm not happy with it.

Got the intercooler mounted.

[jly535]

Hi all, just wanted to introduce myself and looking forward learning all the different types of engine codes and internal part combos and possibilities for the M30.
In searching I found a wealth of info already.

I have an m90 block that is already machined with piston oil squirt nozzles, this is the real 3.5 block from my euro 635 e12 based six. It is already painted and just needs to be bored for whatever pistons. Email me if interested or pics, Jamie jly535@comcast.net

[Good & Tight]

Small update. Made the downpipe and fitted wastegat

[Good & Tight]

Almost done, just need to clean up the wires. Got her to fire up now on to tuning, running MSII extra V3.0.

[Brad D.]

Awesome stuff. I like the manifold with the flipped TB. It should be a monster.