EFI twin snorkel setup

[Ye Olde Rangie]

Hi all tomorrow ill start my custom snorkel setup, so my question is firstly is 3" enough air feed for a 4.2 stroker motor, if not ill be building a custom airbox and run twin snorkels but my problem is that my car has very little room under the bonnet left so the airbox is easy enough but im wanting to know whether anybody has done such a job and do you have pictures.
Thanks Tim

[Vern]

i used to have twin snorkels when i had my 6.5 chev, i made a drivers side version of the ones Les Richmond Automotive do, went to the trouble of making a dummy one then had a mold made so i could get fibreglass ones made. May have some pics somewhere. Still got the mold and may even have a snorkel left over.:)

[Ye Olde Rangie]

if you have pictures that would be really good, i bought all the alloy tubing about 18mths to 2yrs ago to make a twin snorkel setup for my old carby motor which was going to be easy but this is looking to be a little more diffcult

[Gary S11]

Hi I believe that 3" is fine, as the origianal "Holden" 253 4.2 ltr's air cleaner had a intake of about 1 3/4 - 2" if it was lucky in the round type air cleaner. So a stroked LR motor of the same size is still going to pull the same CFM and at 5000 rpm there lucky to move 350 CFM
BUT I fitted twin snorkel to my x 86 range rover just cause it looked tuff. ;-). Gary

[Ye Olde Rangie]

Hi I believe that 3" is fine, as the origianal "Holden" 253 4.2 ltr's air cleaner had a intake of about 1 3/4 - 2" if it was lucky in the round type air cleaner. So a stroked LR motor of the same size is still going to pull the same CFM and at 5000 rpm there lucky to move 350 CFM
BUT I fitted twin snorkel to my x 86 range rover just cause it looked tuff. ;-). Gary

Yeah im thinking the same with the tuff look too, it was on my plans for the old motor so i think i should stick to it and do it with this engine also, do you have any pics of the engine bay? or air cleaner setup
Thanks Tim

[Gary S11]

Hi Tim as mine was a 3.5 carby mod I just ran a pipe from either side and "tee'd it in to the front tube of the std air cleaner, but if yours is any thing like my 3.9 disco there isn't the room with the EFI but I will try to find some pic they will be on the LROCWA site.. Gary

[Ye Olde Rangie]

yeah i did the 3.5 stroker conversion and 5spd out of an early disco 12mths ago but just getting around to finishing the little bits off, and ill have to look at setting up a twin outlet airbox and possibly move some stuff around like the disco washer bottle etc, as it was i didnt have enough room for my second battery under the bonnet because of the std airbox so thats in the cab now

[Gary S11]

Hi again if you go to this link it should take you to my old for sale add with pics
LROCWA Forum (http://www.lrocwa.org.au/forum/cgi-bin/YaBB.cgi?board=parts;action=display;num=1292414326 )

Gary

[Ye Olde Rangie]

Hi again if you go to this link it should take you to my old for sale add with pics
LROCWA Forum (http://www.lrocwa.org.au/forum/cgi-bin/YaBB.cgi?board=parts;action=display;num=1292414326 )

Gary

Thanks Gary it looks alot more simple on that than i thought,

[POD]

Are you going to graft a couple of plenum chambers together and have twin throttle bodies to go with the twin snorkels?
My home-made 3" snorkel fed plenty of air to my EFI 4.4 and now does the same to a 3.9

[Ye Olde Rangie]

Are you going to graft a couple of plenum chambers together and have twin throttle bodies to go with the twin snorkels?
My home-made 3" snorkel fed plenty of air to my EFI 4.4 and now does the same to a 3.9

Nah was just planning on single throttle body with a twin outlet air box and snorkels

[bee utey]

I reckon twin snorkels would slow you down more by increased air resistance than any gain from extra air flow! The 4.2 is still a small bore motor and one 3" snorkel will be fine. Just pay attention to bends and junctions, make sure they are smooth transitions.

[PSI250]

is there enough room to run the drivers side across inside the scuttle panel and join the pass side via a Y piece then just run to the airbox as one pipe as per normal??

i vaguely remember hearing of someone doing it this way on an EFI setup.


That orange 2 door on 37's has twin snorkels and efi, someone on here now owns it, maybe they have pics??

[Tank]

Hi all tomorrow ill start my custom snorkel setup, so my question is firstly is 3" enough air feed for a 4.2 stroker motor, if not ill be building a custom airbox and run twin snorkels but my problem is that my car has very little room under the bonnet left so the airbox is easy enough but im wanting to know whether anybody has done such a job and do you have pictures.
Thanks Tim
Tim I will post a pic of my setup on a 4L (with 3.5 EFI), my setup is 90mm because that is the size of the downpipe fittings I used, no problems with airflow, esp if using round air filter housing and plumbing in the end like I have done, Regards Frank.

https://www.aulro.com/afvb/images/imported/2012/09/1082.jpg

[PSI250]

Can't go through there on a Rangie though due to wrap around bonnet, but can apply same idea.