Author Topic: New 450 6,9 owner@forum  (Read 17531 times)

oversize

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Re: New 450 6,9 owner@forum
« Reply #30 on: 28 May 2014, 05:10 PM »
Well I was gunna mention that an 80mm throttle on a turbo 6.9 is too small!!   ;) ;D 8)
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

oversize

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Re: New 450 6,9 owner@forum
« Reply #31 on: 28 May 2014, 05:44 PM »
Is the engine the high compression Euro version?
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

motec6.9

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Re: New 450 6,9 owner@forum
« Reply #32 on: 28 May 2014, 10:57 PM »
Hi Mark you would have to assume it is as he is in Europe.  :)
Euro 6.9 255.6hp at the wheels. Watch this space.

inc13

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Re: New 450 6,9 owner@forum
« Reply #33 on: 29 May 2014, 01:05 AM »
Hi Mark you would have to assume it is as he is in Europe.  :)
Yes it is european "high Cr" engine. Cr is 8.8:1

Well I was gunna mention that an 80mm throttle on a turbo 6.9 is too small!!   ;) ;D 8)
80 mm on this setup is optimal.Hole under Tb can carved out to 80mm,i dont see the point to have bigger tb if "bottleneck" under it is smaller.Also it is a struggle to fit pipe from Ic to intake over the engine with enough hood clearence.Same thing with IC piping.I will use 3 inch diameter piping after turbo(air side)

Point is: Turbo outlet is 3 inch dia. ,pipes to IC and out is 3 inch ,IC has 3 inch flanges ,Tb is 3,xx inch (76mm is about 3 inch) ,plenum opening is 3,xx inch.
If i do use lets say 4 inch Tb,what would be the benefit? I dont see it.
« Last Edit: 29 May 2014, 01:18 AM by inc13 »

motec6.9

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Re: New 450 6,9 owner@forum
« Reply #34 on: 29 May 2014, 03:38 AM »
Hi inc13 not correct bolt spacing is 105mm I had adaptor made to fit GM LS throttle body after machining out lower plenum for 92mm throttle body leave 6.5mm to bolt holes. But you are correct about problems from fuel distributor to throttle body. All the best with project looking forward to seeing results.  :)
Euro 6.9 255.6hp at the wheels. Watch this space.

inc13

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Re: New 450 6,9 owner@forum
« Reply #35 on: 29 May 2014, 07:35 AM »
Hi inc13 not correct bolt spacing is 105mm I had adaptor made to fit GM LS throttle body after machining out lower plenum for 92mm throttle body leave 6.5mm to bolt holes. But you are correct about problems from fuel distributor to throttle body. All the best with project looking forward to seeing results.  :)
Im not going to use fuel distributor  and also ignition distributor is not going to be used.That does free up some space for me.
I planned to weld an TB adaptor straight to intake manifold,then i can use any bolt pattern for TB.
How did you adapt throttle linkage on your system?

motec6.9

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Re: New 450 6,9 owner@forum
« Reply #36 on: 29 May 2014, 08:30 AM »
Have cut old linkage from throttle body ground back smooth. And welded to new throttle body shaft. This car I am going to see what I can achieve with k jet at the moment. My old 6.9 was running full Motec efi . Hence my user name.  :)
Euro 6.9 255.6hp at the wheels. Watch this space.

motec6.9

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Re: New 450 6,9 owner@forum
« Reply #37 on: 29 May 2014, 08:35 AM »
Euro 6.9 255.6hp at the wheels. Watch this space.

oversize

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Re: New 450 6,9 owner@forum
« Reply #38 on: 29 May 2014, 05:50 PM »
If you're ditching the Kjet I'd be fabricating my own manifold too and avoiding any restrictions to the intake...
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

inc13

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Re: New 450 6,9 owner@forum
« Reply #39 on: 21 March 2015, 07:32 AM »
Exhaust manifold







daantjie

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Re: New 450 6,9 owner@forum
« Reply #40 on: 21 March 2015, 08:21 AM »
Wow, that is impressive, nice job!
Can't wait for dyno results  ;D
Daniel
1977 450 SEL 6.9 - Astralsilber

inc13

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Re: New 450 6,9 owner@forum
« Reply #41 on: 21 March 2015, 09:06 AM »
Wow, that is impressive, nice job!
Can't wait for dyno results  ;D
It will take lots of time before this car gets on the dyno (so much to do before its finished).

oversize

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Re: New 450 6,9 owner@forum
« Reply #42 on: 23 March 2015, 04:19 AM »
Great job with the welding!  Not sure if it matters with a turbo, but the cylinders are normally paired with a NA engine into a tri-Y arrangement to encourage scavenging.  Obviously your design has to be reversed as the gases are being directed forwards to the turbos.  And if you'd like some constructive advice, I'd suggest your collectors are way too small

1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

inc13

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Re: New 450 6,9 owner@forum
« Reply #43 on: 24 March 2015, 01:35 PM »
Great job with the welding!  Not sure if it matters with a turbo, but the cylinders are normally paired with a NA engine into a tri-Y arrangement to encourage scavenging.  Obviously your design has to be reversed as the gases are being directed forwards to the turbos.  And if you'd like some constructive advice, I'd suggest your collectors are way too small
Manifold pipe diameter is correct (not to small) ,exhaust gas speed exeeds supersonic only in one place.If pipe diameter is larger ,spool up and full boost comes later.As it is Single turbo application,there is no actual need for ecual lenght primarys.
Also manifold desing is pretty limited because of narrow space (if ecual leng is a must ,there is no access for spark plugs anymore)

Just as a remark,im running "log style" manifold on my turbo bmw (inline six,boost 1,45 bar) without any problems.Spool is really good and so on.
Here is a picture of it

oversize

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Re: New 450 6,9 owner@forum
« Reply #44 on: 24 March 2015, 04:22 PM »
The pipe diameter is fine, but the collector area is quite small (where you've blended 4 into 1):

1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P