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Old 06-11-2010, 06:52 PM   #1
get your grinders out!!!
 
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rb20de R34 GT Neo engine

I have searched a lot about the question i`ll be asking in a sec. Searched here, on NissanSilvia.com and on the internet ( obvious ).

There are loads of butterfly-valves in the RB Neo engine, i know how these work as the Japspec s13`s came with the same valves, to make the emissions and mpg better ;)

Now is my question this, can i remove them valves without any issues to run the rb20 properly? So not giving in on the rev-ing what they are capable to, and stuff like that.
I am not really interested in good mpg and saving the world But they seem restrictive as god knows what.

Hope that you guys can help me ;)

JJ

Last edited by JJ-san; 06-11-2010 at 07:07 PM. Reason: typo...
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Old 07-11-2010, 01:22 AM   #2
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The only 'butteryfly' in the car is your throttle body, which obviously you can not remove... what valves are you talking about?!

There is a carbon canister and PCV valve fitted for emissions
The carbon canister is easy to remove. Don't touch the PCV valve.
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Old 07-11-2010, 11:58 AM   #3
get your grinders out!!!
 
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Ill make it a bit easier with pics





Only got the engine mate, not the Skyline where it used to sit ;)
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Old 07-11-2010, 12:05 PM   #4
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Woah shows what I know about the NEO lol
Ya learn something new every day eh
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I've been rubbing and i've been pulling - for ages
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Old 07-11-2010, 12:10 PM   #5
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It is basicly to make the Neo part work.

As they are quite the same as i said as the Japspec CA18DET heads.

Frag me...perhaps ill reconsider removing them...

Anyone can prove the Neo part works btw? By mpg sheets and low-end torque differences?
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Old 07-11-2010, 11:54 PM   #6
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Other question...perhaps more important then those funky valves i got

Will there be any differences in the engine looms? Neo vs non-Neo?
Same goes for DET vs N/A....
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Old 09-11-2010, 05:39 PM   #7
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As they are quite the same as i said as the Japspec CA18DET heads.
Nice pictures-

These butterflies don't work quite the same as Jap Spec CA18DET ones...

On the Jap Spec CA18DET there are 8 inlet ports, 2 for each cylinder. There are 4 butterflies on runners 2, 3, 6, & 7.

Below about 3800 rpm these ports are left shut. This increases the speed of the gas flow which makes for a better combustion mixture (better 'swirl')- more homogenous.

That is why the 8 port head makes a lot more torque below 3800 than the 4 port head. This also makes the turbo spool better as well so low speed driveability is much improved....

Runners 1, 4, 5, & 8 remain open at all times- although the butterfly spindle is always present.

The obstruction caused by both the butterflies and the butterfly spindle means that the 4 port head flows better at high revs. So 4 port heads make better power at high revs.

The neo heads operate differently- all ports have single individual runners controlled by single butterflies, and a second butterfly to separate cylinders 1,2,3 from 4,5,6....

Chris
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Old 09-11-2010, 06:50 PM   #8
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We did put some thought into removing the CA18DET 8 port butterflies, but blocking the holes left by the long butterfly spindle and making an accurate gas seal made the job unrealistic- too much work for a small gain...

Any small air leaks would have played havoc with the tuning and there were too many small holes in hard to reach locations to block!!

Chris
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Old 09-11-2010, 11:43 PM   #9
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Was hoping you would respond Chris

Thanks for the input on this!!

There are quite a few people with the Japspec ca18det heads that just left them valves in place, but disconnected the vacuum to it.

I guess my best option is just get everything connected as it should
Have to look into this when im actually connecting the engine to make it run.

Hmmm....frag...hard to make this decision

-edit-
Any ideas on differences in the looms of Neo vs non-Neo and RB20DET engines Chris?
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Old 13-11-2010, 01:53 PM   #10
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Any ideas on differences in the looms of Neo vs non-Neo and RB20DET engines Chris?
JJ-san,

sorry- don't know too much about the RB20DE Neo looms...
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Old 13-11-2010, 01:57 PM   #11
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JJ-san

In fact I wanted to ask about this picture-

Can you describe the two lower holes beneath the actual runner itself? What is the relationship to the runner? Are they connected? Or are they a bypass? What happens on the cylinder head side?

Chris
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Old 13-11-2010, 04:32 PM   #12
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Ill jump into the shed after my tea mate. And make some pics to clear it up
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Old 13-11-2010, 07:26 PM   #13
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Cheers for that, mate ; )

Chris
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Old 13-11-2010, 07:29 PM   #14
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Originally Posted by conceptua View Post
JJ-san

In fact I wanted to ask about this picture-

Can you describe the two lower holes beneath the actual runner itself? What is the relationship to the runner? Are they connected? Or are they a bypass? What happens on the cylinder head side?

Chris
if its the holes i think your talking about its the holes you use to bolt the runners to the head and then the manifold to the runners b
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Old 13-11-2010, 08:20 PM   #15
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They are not actually....









Aligns with the 2nd half of the inlet manifold. The part where the injectors come in.
Hope the pics make it clear

Chris, do you have got any rb20de loom around for sale?
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