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Four barrel EFI


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#1 ozconnection

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Posted 25 December 2016 - 03:14 AM

Playing around with throttle bodies.....

 

 

 

 


'78 280C sedan P30 Y70 L4N71B 4.11 H190 131 rwhp. NA 
'71 240C coupe N42 E88 FS5W71B 4.625 H190LSD Megasquirt V3.57 NA 225 rwhp

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#2 BJSZED

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Posted 25 December 2016 - 06:54 AM

Nice setup ! Very interested in how the delayed secondary throttle plates will work. I have a 4 barrel throttle body setup which works very well at low and high revs, very smooth. All my throttle plates move at the same time.

 

A couple things to watch out for is correct pcv operation with a dual plenum intake. And double check if your getting a proper ported vacuum signal for your distributor. Because of the small cubic inches, the throttle plates are more closed at idle and cruise which can affect the ported vacuum signal. I had to re-drill lower in the throttle bore.  

 

Anyway, I always like reading your posts, great job !

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Edited by BJSZED, 25 December 2016 - 06:56 AM.


#3 ozconnection

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Posted 26 December 2016 - 02:12 PM

Hi BJSZED,

 

Thanks for your input man!.

 

On the Clifford manifold, the PCV is positioned exactly behind the plenum divider in the manifold so that three cylinders receive half the gasses, the other three receive the rest...make sense?

 

Ported vacuum signals are not used for this setup. At the moment the distributor is locked at 30 degrees. The throttle body configuration is setup on my track car so it really doesn't really need an advance curve for the track as it rarely ever drops the revs below 3.5K rpm

 

Having said that, my next round of modifications will include a balancer 36-1 timing wheel to allow for adjustable ignition timing. The car gets driven to the track so some low speed tractability will be useful in those circumstances.

 

The engine is managed by a Megasquirt ECU.

 

Cheers! :-)


'78 280C sedan P30 Y70 L4N71B 4.11 H190 131 rwhp. NA 
'71 240C coupe N42 E88 FS5W71B 4.625 H190LSD Megasquirt V3.57 NA 225 rwhp

'Nissantiques - join the club'

TheTwilightZone2011-12-03007-1.jpgmy330014-1.jpg


#4 BJSZED

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Posted 27 December 2016 - 04:49 PM

Looking forward to the updates !






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