Big Bang Theory: Oettinger 2500E rebuild

for questions and answers about alternative power transplants on the T25, GTi, Porsche,Subaru etc, this is the place. You must register to post but anyone can read.

Moderators: User administrators, Moderators

silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by silverbullet »

Now if some kind wbx-6 owner could let me take a mold from the top of their inlet manifold, I could be persuaded to go down the cast plenum route, maybe making a few more for flat-4 engines if there is a bit of interest?
Image

User avatar
lloydy
Registered user
Posts: 8013
Joined: 24 Nov 2009, 17:54
80-90 Mem No: 5262
Location: cheam surrey

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by lloydy »

i didn't realise oettinger were the same firm as okrasa, they did superchargers for beetles
Time is a drug. Too much of it kills you

User avatar
axeman
Registered user
Posts: 1236
Joined: 07 Feb 2009, 19:50
80-90 Mem No: 6410
Location: Smeeth kent country side

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by axeman »

Sure your not thinking of judson supercharger for the USA. Ocrasa moded the heads cranks and added carbs on air cooled engines.

Neil
Back in the game with an uncut 2wd panel van

User avatar
Aidan
Trader
Posts: 6522
Joined: 11 Oct 2005, 19:21
80-90 Mem No: 742
Location: Llanfyllin, mid Wales : )
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by Aidan »

think it would be better with a Holman logo frankly

silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by silverbullet »

Image

silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by silverbullet »

I remembered that I still have an EJ22 inlet manifold here. The plenum measures 12 x 13 x 6cm which equates to a volume of only 900-1000cc... but the throttle body is better placed than the wbx item.
Time to consult A. Graham Bell again...

User avatar
lloydy
Registered user
Posts: 8013
Joined: 24 Nov 2009, 17:54
80-90 Mem No: 5262
Location: cheam surrey

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by lloydy »

axeman wrote:Sure your not thinking of judson supercharger for the USA. Ocrasa moded the heads cranks and added carbs on air cooled engines.

Neil
i know judson, Okrasa just rang a bell
Time is a drug. Too much of it kills you

silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by silverbullet »

I am having bad thoughts about twin plenums with variable length inlet manifolds...and I can make it all myself!
Need to read up on MS to see it can control a stepper motor to actuate a VLM, then get an idea of the optimum runner lengths for the 2000-6000rpm range to see if it feasable with the space available.

User avatar
Titus A Duxass
Registered user
Posts: 5778
Joined: 24 Nov 2007, 08:22
80-90 Mem No: 4475
Location: Cologne

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by Titus A Duxass »

silverbullet wrote:I am having bad thoughts about twin plenums with variable length inlet manifolds...and I can make it all myself!
Need to read up on MS to see it can control a stepper motor to actuate a VLM, then get an idea of the optimum runner lengths for the 2000-6000rpm range to see if it feasable with the space available.

I love it when you talk dirty......
VW T3 GTi Camper 2,0l

silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by silverbullet »

I managed to put in a swift couple of hours after work and cracked the seal...warmed tue heads and tue batrels stayed put. One hairline between the seats on #1, not really a surprise as its furthest from the waterpump so I will swap the heads over and make that #4.
Image
Image
Image
Image

silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by silverbullet »

My custom-made expanding slide hammer comes good once again. Thankfully this engine was assembled correctly, so the gudgeon pins pull without too much effort :)

Image

Some interesting details visible inside, standard wbx con-rods but subtly modified...all looks very healthy too.


silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by silverbullet »

Inlet manifold stubs also ported, but one injector pintle shroud looks melted (?)
Image
On the other side rust has cracked the plastic of the solenoid housing...
Image
They will all need replacing then...

User avatar
Aidan
Trader
Posts: 6522
Joined: 11 Oct 2005, 19:21
80-90 Mem No: 742
Location: Llanfyllin, mid Wales : )
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by Aidan »

100 bucks a set in USA might be worth a punt, not bosch though,

silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Big Bang Theory: Oettinger 2500E rebuild

Post by silverbullet »

Used to be able to chop them in for exchange, design is same as early Rover Vitesse or Jag V12 (pre-O ring fuel rail) and there are enough of those about, but they were grey body injector.
PITA that VW had to angle the injectors in the manifolds. Stupid detail. Enough to motivate me to remake them in alloy with injectors parallel and new fuel rails to suit.

Post Reply