Twin Turbo 928 fixed and back out there terrorizing the streets!
06-08-2015, 04:34 PM
#916
Not the sharpest tool in the shed
Rennlist Member
Rennlist Member
There are other devices that have been altering the brain for a long time. My personal favorite when tracing electrical problems on a 928 (see how I kept this relevant to this forum?)
Cool links - and way weird stuff. I would post this up in OT.
Cool links - and way weird stuff. I would post this up in OT.
06-09-2015, 08:04 PM
#917
Addict
Rennlist Member
Rennlist Member
Join Date: Feb 2004
Location: Monterey Peninsula, CA
Posts: 2,374
Likes: 0
Received 16 Likes
on
12 Posts
The exhaust manifolds are now a definitely a go, John released the purchase order, the foundry has the models, and the delivery date is mid July. Here's the last rendering.
Attachment 943344
This version passes the casting requirements, thermal stress requirements, gas flow requirements, and sensor location requirements.
Note the five sensor bungs. The four individual runner bungs can be used for either pressure traces or for WBO2 measurements (both need heat shields for the sensor). The fifth is for a very convenient access port for either slow (cycle average) pressure sensor, WBO2, or EGT. The point of that port is that it's more convenient to access than the individual runner ports. The best place to measure WBO2 for the whole bank is of right after the turbine because the burn process continues in the turbine and the readings are more reliable because of a more complete burn - downpipes have those.
Attachment 943344
This version passes the casting requirements, thermal stress requirements, gas flow requirements, and sensor location requirements.
Note the five sensor bungs. The four individual runner bungs can be used for either pressure traces or for WBO2 measurements (both need heat shields for the sensor). The fifth is for a very convenient access port for either slow (cycle average) pressure sensor, WBO2, or EGT. The point of that port is that it's more convenient to access than the individual runner ports. The best place to measure WBO2 for the whole bank is of right after the turbine because the burn process continues in the turbine and the readings are more reliable because of a more complete burn - downpipes have those.
Are you going to use the in cylinder pressure monitoring as well?
06-09-2015, 10:07 PM
#918
Nordschleife Master
Thread Starter
Pressure measurement ports need to be normal to the flow. The ports in the head face the flow.
We'll measure the cylinder pressure if we figure out how to fit everything that needs to fit inside the spark plug tower.
We'll measure the cylinder pressure if we figure out how to fit everything that needs to fit inside the spark plug tower.
06-10-2015, 12:19 AM
#919
Addict
Rennlist Member
Rennlist Member
Join Date: Feb 2004
Location: Monterey Peninsula, CA
Posts: 2,374
Likes: 0
Received 16 Likes
on
12 Posts
Twin Turbo 928 fixed and back out there terrorizing the streets!
Originally Posted by ptuomov
Pressure measurement ports need to be normal to the flow. The ports in the head face the flow.
We'll measure the cylinder pressure if we figure out how to fit everything that needs to fit inside the spark plug tower.
We'll measure the cylinder pressure if we figure out how to fit everything that needs to fit inside the spark plug tower.
Good luck with the pressure sensors. If you succeed with them, let me know, as I am curious to run either pressure or egt to my logger.
07-02-2015, 11:23 AM
#920
Nordschleife Master
Thread Starter
Casting **** without a casting couch!
John sent me some screen shots from the design review of the casting process. (I couldn't join the event because of the ducking financial markets day job...) Molds, cores, yadayada yaa. One thing that I learned from these is that you _can_ do casting **** without a casting couch! ;-)
07-07-2015, 08:08 PM
#923
Nordschleife Master
Thread Starter
07-07-2015, 08:38 PM
#924
Nordschleife Master
Thread Starter
FIRE IN THE HOLE!!!
Def Leppard:
Pour some sugar on me
Ooh in the name of love
Pour some sugar on me
C'mon fire me up
Pour your sugar on me
Ooh I can't get enough
I'm hot, sticky sweet
From my head to my feet, yeah
Pour some sugar on me
Ooh in the name of love
Pour some sugar on me
C'mon fire me up
Pour your sugar on me
Ooh I can't get enough
I'm hot, sticky sweet
From my head to my feet, yeah
07-07-2015, 08:46 PM
#925
Addict
Rennlist Member
Rennlist Member
Join Date: Feb 2004
Location: Monterey Peninsula, CA
Posts: 2,374
Likes: 0
Received 16 Likes
on
12 Posts
You need a different mold for each manifold, they are not symmetric. The blocks are separate, and poured separately, if I understood your question correctly. The patterns in the photos are 3D printed from sand with a particular process. The design of the molds is such that it's feasible to build the patterns that can be used to produce those sand molds faster without 3D printing.
Attachment 952084
Attachment 952085
Attachment 952086
Attachment 952087
Attachment 952084
Attachment 952085
Attachment 952086
Attachment 952087
07-08-2015, 01:18 AM
#926
That's pretty cool. (Or hot, as it were). I am not sure I would be wearing a t-shirt.
He has ordered enough to make each unit-set realistically priced?
He has ordered enough to make each unit-set realistically priced?
07-08-2015, 03:11 AM
#927
Nordschleife Master
Thread Starter
The 3D print makes the small series economical. Plus the alternative of hand fabricating that manifold (as in the previous versions of the kit) is very expensive.
