M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Engine + Driveline => Topic started by: davies1644 on March 21, 2007, 01:31:41 PM

Title: M42 on twin webbers is it worth it?
Post by: davies1644 on March 21, 2007, 01:31:41 PM: Hi their am looking in to making my 318is a lot quicker anyone have any suggestions? I am thinking of putting twin Weber DCOE Carbs on and was wondering what kind of gains i can expect to see or if their are any better ways?
Cheers
Title: M42 on twin webbers is it worth it?
Post by: Gunni on March 21, 2007, 03:50:10 PM: get the webber ITB´s and put them on,
adjust the system for MAF or MAP and you should be having alot of fun
Title: M42 on twin webbers is it worth it?
Post by: davies1644 on March 21, 2007, 04:04:36 PM: can you explain that in english lol have only just bought the car and am looking for some modification to take it to the 180bhp mark if possible
Title: M42 on twin webbers is it worth it?
Post by: Gunni on March 21, 2007, 04:11:17 PM: Weber makes throttle bodies houses as well as carburators
check their website and have them send you a catalog.
Title: M42 on twin webbers is it worth it?
Post by: Nick_318is on March 21, 2007, 06:47:52 PM: you going to turbo/supercharge it? I dont think you will see 180 hp without pouring money at it, either on engine work or a turbo.
Title: M42 on twin webbers is it worth it?
Post by: Shocker on March 21, 2007, 08:53:05 PM: Why would you go back to ancient technology (carburetor) when it’s already Fuel injected? Going carbureted isn’t going to get you 40-60 extra HP by itself. In my opinion you’re going backwards. Your better off going ITB’s.
Title: M42 on twin webbers is it worth it?
Post by: 1991 E30 M42 on March 21, 2007, 09:53:16 PM: I found this earlier today.http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=009&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=190095065725&rd=1,1
Title: M42 on twin webbers is it worth it?
Post by: Shocker on March 21, 2007, 09:58:51 PM: Quote from: 1991 E30 M42;21963
I found this earlier today.http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=009&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=190095065725&rd=1,1

But why would you want Carbs on a fuel injected motor??? I can see ITB’s but not Carbs. Carbs would be more work than ITB's. IMHO
Title: M42 on twin webbers is it worth it?
Post by: AL GReeNeRy on March 22, 2007, 01:02:35 AM: Quote from: Shocker;21965
But why would you want Carbs on a fuel injected motor??? I can see ITB’s but not Carbs. Carbs would be more work than ITB's. IMHO

i think the point of that manifold was to use it to adapt ITBs to the m42..

as pulled from the auction listing:

"You are looking at a Performance Intake Manifold set used for Installing twin Weber DCOE Carbs on your M42 M44 4 cylinder BMW engine.

These are used mainly for racing applications and with modification serve as a great platform for individual throttle body conversions."

not a bad idea.. pretty F**Ken cheap too.. sold for about $45
Title: M42 on twin webbers is it worth it?
Post by: 2002maniac on March 22, 2007, 05:13:56 AM: Have you priced carbs recently? You can do a really nice custom ITB setup for the price of DCOE's, manifolds, linkage, and stacks. I sold the 45's off my 2002 for over $1k

Carbs can make really good power on a built motor but even perfectly tuned they wouldnt give more than 15hp to an internally stock M42.
Title: M42 on twin webbers is it worth it?
Post by: davies1644 on March 22, 2007, 05:38:17 AM: well what can you suggest to get my power figures up?
Title: M42 on twin webbers is it worth it?
Post by: Gunni on March 22, 2007, 06:05:56 AM: turbo ?
10psi = easy 230hp
Title: M42 on twin webbers is it worth it?
Post by: davies1644 on March 22, 2007, 02:29:36 PM: Dont know if i want 2 turbo it as this is quite costly and will take a while, any other suggestions?
Title: M42 on twin webbers is it worth it?
Post by: sheepdog on March 22, 2007, 04:09:24 PM: If you did go Weber, how do you plan to run the ignition?

Be prepared to spend bucks...

At any rate, getting 180hp out of an M42 is no easy task without supercharging of some sort, bore/stroke or getting a pro engine builder to build you a killer. Backyard engineering it will simply not happen.

No matter how you try to do this, you are looking at AT LEAST $3000 to reach anything close to what you want. No matter what methods you chose. The shear amount of work makes it expensive. Have you looked at what cams cost for this motor? How about aftermarket injection or spark? Spark is tied to the computer you plan to remove by using Webers.

Even if you can get that power, you will need a rebuild VERY quick, if not before you start.
Title: M42 on twin webbers is it worth it?
Post by: sheepdog on March 22, 2007, 04:17:17 PM: Quote from: Gunni;21979
turbo ?
10psi = easy 230hp

Equals blown motor.
Title: M42 on twin webbers is it worth it?
Post by: Gunni on March 22, 2007, 05:11:00 PM: Explain blown motor?
Title: Boom!
Post by: Donkeyshins on March 22, 2007, 05:19:34 PM: Expensive bits of engine becoming worthless fragments of engine.

Overboosting can result in holed pistons, broken rods, anguished cries and towtruck bills.

This is not to say it can't be done, but it's gonna cost you.

-D
Title: M42 on twin webbers is it worth it?
Post by: Shocker on March 22, 2007, 05:43:43 PM: the stock motor can easily handle 10PSI
Title: M42 on twin webbers is it worth it?
Post by: Nick_318is on March 22, 2007, 06:13:25 PM: Throw buckets full of money at the m42 and thats how you get 180hp or more.
Title: M42 on twin webbers is it worth it?
Post by: Gunni on March 22, 2007, 06:55:01 PM: 10psi on a 10:1 compression engine is nothing special.
As long as the tuning is good and your not getting exhaust reversion into the engine your fine,
Title: M42 on twin webbers is it worth it?
Post by: Massimo on March 22, 2007, 07:35:27 PM: Well are you looking for a 180 hp at the wheels or motor if its at the motor then thats not to hard. Get a chip that will instantly bring you up to around 150 to 160 hp. then remove the cat, about another 5 to 10 hp gain. ant then get some cams that should give you another 10 hp and you are there. but if you want hp at the wheels then get a complete new computer, a race spec blue printing on the motor with ITBs and new fuel and ignition system then maybe you will get a streetable 180 hp at the wheels.
Title: M42 on twin webbers is it worth it?
Post by: m44power on March 23, 2007, 11:30:08 AM: andd.... what you gone do for ignition ???? and fuel presure?

i you want my opinion: We have the best injection system (exept this stupid VAF) dont touch it ;)
Title: M42 on twin webbers is it worth it?
Post by: sheepdog on March 23, 2007, 12:38:56 PM: Quote from: Gunni;22026
10psi on a 10:1 compression engine is nothing special.
As long as the tuning is good and your not getting exhaust reversion into the engine your fine,

That IS NOT true.

On a Honda 10psi on 10:1 is no big deal. Not every engine can do this. On many v8's you can barely run 10:1 on premium. On some cars 10:1 is pretty damn high compression.
Title: M42 on twin webbers is it worth it?
Post by: sheepdog on March 23, 2007, 12:45:13 PM: Lets take stock here guys..

This motor is now becoming known for having oiling issues at 150k miles.
It is also known that it does not take more than a chip to require 93 octane fuel. In other words, in stock form, the heads suck.
Most of these motors are around 150k or so miles and are known for thrust bearing wear. Bad oiling only accelerates this.

For the 230hp/10psi setup...
Do you REALLY think doubling the horsepower is a good idea without freshening the motor?

Will it do it, possibly, but for how long?
At that point, even the slightest miss-judgement will result in a trashed motor.

You are not dealing with an indestructible Honda or Toyota who's worst fear is pretty much a blown head gasket.

Then there is the human factor "I am bored lets try 11 or 12psi" or "I can win this race if I just go a little higher".
Title: M42 on twin webbers is it worth it?
Post by: nickmpower on March 23, 2007, 01:23:35 PM: my thrust bearing looked amazing at 135k