niceperson709
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| posted on 27/10/08 at 05:36 AM |
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Cuting and shutting inlet manifold/ Plenem
Due to the registration requirements here I had to keep my EFI bog standard and now that I has been on the road fro a while I would like to re-work
my manifold so that it all fits more neatly under the bonnet. at present I have this huge and not so attractive bulge in my bonnet.
My idea is to cut off the plenum and to turn it around so that the throttle body is facing the front of the engine then I want to cut the manifold
just outboard of the injectors then replace the longish curved manifold sections with shorter straight sections of aluminium tube of course making
sure that they are all as close to being the same length and cleaning up the ports inside afterwards.
There seems to be a section that appears to join all of the runners together and there is a hose that connects this to the rocker cover can this just
be deleted? (a)
Likewise what is the purpose of the metal pipe that seems to come from the exhaust side of the motor and do I have to ensure that I extend and
re-work this? (B)
I know that many here are big fans of things like Mega squirt but if possible I want to continue to use the stock computer (Nissan N16) and The
reasons i want to do this are all about packaging rather than absolute performance
thanks in advance
Best wishes IAIN
life is not the rehearsal , it's the show so don't sit there thinking about it DO IT NOW
http://iainseven.wordpress.com/
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JAG
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| posted on 27/10/08 at 10:53 AM |
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Hi Mate,
I think both a) and b) are about recirculating gases.
a) is the rocker cover breather - oily vapour is being recirculated into the intake of the engine to avoid emmissions to atmosphere. This can be
redirected into a catch tank - assuming local laws etc... allow.
b) sounds like the EGR system. Exhaust Gas Recirculation - again it's about emmissions. However this system is usually controllled by the ECU.
If you want to keep the standard system you should investigate what the ECU will do if you remove this control. It may do nothing and not notice that
the EGR system is no longer there but you should check first.
Also don't forget that by removing the curved tubes in the intake manifold you are shortening the inlet tract. This will change the torque/power
characteristics of the engine. Shorter pipes will PROBABLY shift the peak torque/peak power further up the rev' range. Not the end of the world
but you should be aware.
Otherwise "Good Luck" with the modifications and keep us abreast of the work via pictures every now and then.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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niceperson709
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| posted on 27/10/08 at 08:47 PM |
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You are right Justin that the best thing to do is to retain the original plumbing as much as possible. and what you say about shortening the inlet
tracts altering the torque curve has occurred to me. From my motorcycling days I think making then shorter may make the engine pick up a bit quicker
but I do not think that there will be much to be lost over all.
I will look into just how the rocker vent pipe is actually connected to the intake and see if I can re plumb it into the plenem .
Cheers
Iain
Best wishes IAIN
life is not the rehearsal , it's the show so don't sit there thinking about it DO IT NOW
http://iainseven.wordpress.com/
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