carmudgeons.com  

Go Back   carmudgeons.com > Automotive Forums > Going Faster

Reply
 
Thread Tools Display Modes
Old 06-09-2022, 12:41 PM   #451
wdc330i
dogged
 
wdc330i's Avatar
 
Join Date: Dec 2003
Carmudgeonly Ride: '22 M440 xDrive GC
Posts: 13,246
Whoa. Just saw this. What a mess.
wdc330i is offline   Reply With Quote
Old 07-14-2022, 08:27 AM   #452
John V
No more BMWs
 
John V's Avatar
 
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
The state of my short block for the past two weeks. Rings gapped, cylinders honed, measured and cleaned, bearing clearances measured. Crank, oil pump, rear main seal installed. So basically all of the time-consuming work has been done. It just needs pistons. I've been waiting on them for a month. They were supposed to ship last Friday, but the manufacturer encountered delays in final machining. Now they're supposed to ship (overnight) on Friday, to get to me on Saturday). I'm not holding my breath.

I leave for Toledo on Wednesday, with or without the car.

I'm kind of excited about this engine. It's now an Ecoboost crank (which is forged, 94mm stroke rather than the 100mm stroke of the cast 2.5 crank). Same 89mm bore, so it's now 2.34L, down from 2.49L. Pistons are now 2618 forgings, much stronger than the prior pistons. Upgraded to Ecoboost sodium-filled exhaust valves. It should make as much power as the last one. It might make a little less power from 3500-4500 RPM but I was always limiting boost at low RPM anyway since it would just knock the tires off. The shorter stroke gives me more RPM headroom. Safe upper limit should be 8500 RPM now - don't think I'll ever go there, but being able to routinely spin to 7500-7800 would be really nice.

Also new engine mounts, something I CAD'ed up and bought from SendCutSend.com, then welded up. Much nicer than my old hacked-together tubular mounts.

JV
Attached Thumbnails
Click image for larger version

Name:	2022 MZR.jpg
Views:	275
Size:	431.7 KB
ID:	14947  
John V is offline   Reply With Quote
Old 07-14-2022, 08:52 AM   #453
JST
195
 
JST's Avatar
 
Join Date: Oct 2003
Posts: 24,593
Is the block still a basic 2.5L block? And when you say eco boost, is that the 2.0 or the 2.3?
JST is offline   Reply With Quote
Old 07-14-2022, 09:14 AM   #454
John V
No more BMWs
 
John V's Avatar
 
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
It's a basic 2.5L block.

The 94mm crank is the 2.3L unit.
John V is offline   Reply With Quote
Old 10-10-2022, 10:42 PM   #455
JST
195
 
JST's Avatar
 
Join Date: Oct 2003
Posts: 24,593
Gordon Murray also apparently enjoys a built Duratec:

https://www.theautopian.com/mclaren-...d-masterpiece/
JST is offline   Reply With Quote
Old 10-11-2022, 07:16 AM   #456
John V
No more BMWs
 
John V's Avatar
 
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
Pretty cool, odd though that he didn't use a VVT head. That's just throwing power away for no good reason.
John V is offline   Reply With Quote
Old 10-11-2022, 07:30 AM   #457
JST
195
 
JST's Avatar
 
Join Date: Oct 2003
Posts: 24,593
Trying to replicate the peakier power delivery of the original? Idk, that’s the only thing I can think.
JST is offline   Reply With Quote
Old 10-11-2022, 11:37 AM   #458
John V
No more BMWs
 
John V's Avatar
 
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
A lot of people don't run VVT because their engine management solutions can't run it. But when running a factory ECU is so easy, there's really no reason to use anything else for a street car.
John V is offline   Reply With Quote
Old 10-11-2022, 11:54 AM   #459
Nick M3
Relic
 
Nick M3's Avatar
 
Join Date: Oct 2003
Location: Bethesda, MD
Posts: 12,438
Quote:
Originally Posted by John V View Post
A lot of people don't run VVT because their engine management solutions can't run it. But when running a factory ECU is so easy, there's really no reason to use anything else for a street car.
I'm going to guess that it's related to the ITBs and etc.
__________________
2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32

Hers:
1989 325iX
1996 911 Turbo


Nick M3 is offline   Reply With Quote
Old 10-11-2022, 07:16 PM   #460
John V
No more BMWs
 
John V's Avatar
 
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
What would itbs have to do with vvt? If anything I'd want vvt more with an ITB motor
John V is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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
Forum Jump


All times are GMT -4. The time now is 05:30 AM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Forums © 2003-2008, 'Mudgeon Enterprises - Site hosting by AYN & Associates, LLC