ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Roadster and Coupe > General BMW Z4 Forum
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      05-07-2007, 01:08 AM   #1
jasper
Private First Class
21
Rep
106
Posts

Drives: 2002 325i
Join Date: Jan 2006
Location: San Ramon, CA

iTrader: (0)

Z4 M engine oversquare?

I noticed the specs on the BMW Z4 M engine show the engine as being "oversquare" but the old engine wasn't...
http://www.bmwusa.com/vehicles/M/z4mcoupe/techdata

it's also listed this way in the pdf brochure for download.

M3 engine is listed as bore/stroke of 3.43/3.58

and

Z4 M engine is listed as bore/stroke of 3.58/3.43

It must be a typo but seems strange they got it wrong on the website and the brochure.

Sorry if this has already been discussed, I searched, but found nothing.
Appreciate 0
      05-07-2007, 07:35 AM   #2
SoCalS2k
Major
SoCalS2k's Avatar
448
Rep
1,035
Posts

Drives: S2K!
Join Date: Sep 2006
Location: LA

iTrader: (0)

Garage List
2001 Honda S2k  [8.50]
Just a quick question. Why is it a bad thing to have an oversquare engine?
Appreciate 0
      05-07-2007, 10:53 AM   #3
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

Not sure what measurements are correct, but the engine hasn't changed.
Appreciate 0
      05-07-2007, 11:05 AM   #4
jasper
Private First Class
21
Rep
106
Posts

Drives: 2002 325i
Join Date: Jan 2006
Location: San Ramon, CA

iTrader: (0)

Oversquare is not bad... here's a great article on Wikipedia. "Oversquare" and "Undersquare" each design has advantages/disadvantages...

http://en.wikipedia.org/wiki/Oversquare

One interesting thing the article mentions is that all F1 cars are Oversquare. It seems that really high-reving engines benefit from being Oversquare.

But I learned some interesting things from that article.

I thought it would be cool if they tweaked the M engine. I was thinking about when the engine 1st came out and it was having some technical problems... I thought this might be to address that problem. But it must simply be a typo.

Again... it's sure strange they made a typo on the website and in the brochure.
Appreciate 0
      05-07-2007, 03:37 PM   #5
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

Just found a 2005 M3 user's manual.

Found the same thing you did. The M supplement to the Z4 Manual doesn't list bore and stroke so I'm not sure what to tell you

Last edited by Dammmittt; 05-07-2007 at 03:47 PM.. Reason: I'm retarded
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 09:03 AM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST