Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Direct Injection for 928s

Thread Tools
 
Search this Thread
 
Old 12-20-2007, 07:50 PM
  #1  
Mongo
Official Bay Area Patriot
Fuse 24 Assassin
Rennlist Member
Thread Starter
 
Mongo's Avatar
 
Join Date: Nov 2001
Posts: 31,653
Received 119 Likes on 62 Posts
Lightbulb Direct Injection for 928s

This maybe something of a thought, a very expensive one if done right, but has anyone considered the though of adapting direct injection to 928s?

Porsche has been recently incorporating direct injection on their cars that will be released in mid-late 2008. The benefits of direct injection have increased horsepower and economy. This technology originated on diesels and is making its way into fuel injected engines producing great results. I'm curious to see what adapting a system like this on the 928 would do and what doors to further modifications would open up to our motors?
Mongo is offline  
Old 12-20-2007, 07:58 PM
  #2  
Jim bailey - 928 International
Addict
Rennlist Member

Rennlist
Site Sponsor

 
Jim bailey - 928 International's Avatar
 
Join Date: Jul 2001
Location: Anaheim California
Posts: 11,542
Likes: 0
Received 3 Likes on 3 Posts
Default

Where would you propose drilling the holes in the cylinder head for the injectors ??
Jim bailey - 928 International is offline  
Old 12-20-2007, 08:06 PM
  #3  
Mongo
Official Bay Area Patriot
Fuse 24 Assassin
Rennlist Member
Thread Starter
 
Mongo's Avatar
 
Join Date: Nov 2001
Posts: 31,653
Received 119 Likes on 62 Posts
Default

Well you are talking to Mongo
Mongo is offline  
Old 12-20-2007, 08:33 PM
  #4  
FlyingDog
Nordschleife Master
 
FlyingDog's Avatar
 
Join Date: Sep 2004
Location: Not close enough to VIR.
Posts: 9,429
Likes: 0
Received 2 Likes on 2 Posts
Default

All I have to say is that it's peanutbutterjellytime.
FlyingDog is offline  
Old 12-20-2007, 08:42 PM
  #5  
Bill51sdr
Fleet of Foot
Rennlist Member
 
Bill51sdr's Avatar
 
Join Date: Aug 2003
Location: We are there!(San Diego)
Posts: 10,780
Received 49 Likes on 40 Posts
Default

Mongo bored.
Bill51sdr is offline  
Old 12-20-2007, 10:42 PM
  #6  
69gaugeman
Nordschleife Master
 
69gaugeman's Avatar
 
Join Date: Dec 2004
Location: Guelph, Ontario, Canada
Posts: 6,164
Likes: 0
Received 5 Likes on 5 Posts
Default

Originally Posted by Mongo
Well you are talking to Mongo
I didn't know you spelled "mongo" as D-A-N-G-L-E-R-B
69gaugeman is offline  
Old 12-20-2007, 11:07 PM
  #7  
RyanPerrella
Nordschleife Master
 
RyanPerrella's Avatar
 
Join Date: Apr 2006
Location: Beverly Hills, CA
Posts: 8,929
Likes: 0
Received 2 Likes on 2 Posts
Default

or MORON
RyanPerrella is offline  
Old 12-20-2007, 11:48 PM
  #8  
JEC_31
Three Wheelin'
 
JEC_31's Avatar
 
Join Date: Aug 2003
Location: DFW
Posts: 1,641
Likes: 0
Received 0 Likes on 0 Posts
Default

In all seriousness, this is the kind of technology that isn't easy to retrofit to older engines, as it's implementation appears to require that it be an integral part of the complete engine design.

But nothing is impossible.

Step 1: aquire a new Porsche with direct injection

Step 2: dismantle, reassemble, understand

Step 3: Once "understand" is reached, can system be extracted from new Porsche as unit(s) or is it too integral?

Step 4: Plan retrofit. First problem: where in the head? Next: support systems...

JEC_31 estimation of # of pleasantly challenging problems:





x 10
JEC_31 is offline  
Old 12-20-2007, 11:57 PM
  #9  
hacker-pschorr
Administrator - "Tyson"
Lifetime Rennlist
Member
 
hacker-pschorr's Avatar
 
Join Date: Aug 2001
Location: Up Nort
Posts: 1,605
Received 2,227 Likes on 1,256 Posts
Default

Originally Posted by Jim bailey - 928 International
Where would you propose drilling the holes in the cylinder head for the injectors ??
If those air cooled *** draggers can figure out a way to squeeze two spark plugs into each cylinder......we can fit in an injector
hacker-pschorr is offline  
Old 12-21-2007, 01:07 AM
  #10  
largecar379
Three Wheelin'
 
largecar379's Avatar
 
Join Date: Jan 2007
Location: not where you think I am
Posts: 1,466
Likes: 0
Received 0 Likes on 0 Posts
Default

seems simple enough to me on the 32V head.....

move to a twin plug with each on the side of the injector (putting the injector in the original spark plug location).

no, I haven't done any measurements on this, but this stuff has been done on other engines long before this discussion came up............


---Russ
largecar379 is offline  
Old 12-21-2007, 01:14 AM
  #11  
Lizard928
Nordschleife Master
 
Lizard928's Avatar
 
Join Date: Apr 2003
Location: Abbotsford B.C.
Posts: 9,600
Received 34 Likes on 25 Posts
Default

Sorry russ but a 928 engine isnt exactly a chevy. I doubt that there would be enough room, plus this would require EXTENSIVE head modification and we dont have crappy tin valve covers which are easily modified.

the covers on our cars are magnesium, good luck getting that modified.
be cheaper to setup a group buy and have a new head engineered and mold made.
Lizard928 is offline  
Old 12-21-2007, 01:34 AM
  #12  
RyanPerrella
Nordschleife Master
 
RyanPerrella's Avatar
 
Join Date: Apr 2006
Location: Beverly Hills, CA
Posts: 8,929
Likes: 0
Received 2 Likes on 2 Posts
Default

i cant believe we are still feeding this topic

polish some wheel nuts or check or replace some fuses or something .........
RyanPerrella is offline  
Old 12-21-2007, 01:49 AM
  #13  
mark kibort
Rennlist Member
 
mark kibort's Avatar
 
Join Date: Feb 2003
Location: saratoga, ca
Posts: 29,953
Received 170 Likes on 66 Posts
Default

isnt direct injection all about the injectors only firing when called for, rather than a batch firing as we, and most FI cars havfe? i dont think it means the injector needs to be sitting in the heads, to be direct injection. true or false?

mk
mark kibort is offline  
Old 12-21-2007, 02:00 AM
  #14  
RyanPerrella
Nordschleife Master
 
RyanPerrella's Avatar
 
Join Date: Apr 2006
Location: Beverly Hills, CA
Posts: 8,929
Likes: 0
Received 2 Likes on 2 Posts
Default

direct injection is a much higher pressure line fired directly into the combustion chamber.

its incredibly precise and an entire engine management system would need to be employed just to take care of the electronics aspect. That would actually be the easy part. The mechanical aspect would require new heads for a start, brand new castings ON AND ON AND ON!

just but a DI cayenne!
RyanPerrella is offline  
Old 12-21-2007, 03:20 AM
  #15  
Bill Ball
Under the Lift
Lifetime Rennlist
Member
 
Bill Ball's Avatar
 
Join Date: Mar 2002
Location: Buckeye, AZ
Posts: 18,647
Received 49 Likes on 36 Posts
Default

Originally Posted by largecar379
seems simple enough to me on the 32V head.....

move to a twin plug with each on the side of the injector (putting the injector in the original spark plug location).---Russ
OK, I'll bite...where are you going to move the valves?
Bill Ball is offline  


Quick Reply: Direct Injection for 928s



All times are GMT -3. The time now is 03:03 AM.