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the next one i'd like to use 2 throttle bodies on, to even out the air distribution. the horn works but there is an air distribution issue at low throttle opening angles, i find the center 2 cylinders are rich, i put a correction in the computer for it, but that is a bandaid.
Could you do an SVS type intake, some engine seen to work better than others, Seems for allround performance the 2.5 Pro Max motors work better than the Horn engines.Quote:
Originally Posted by mrcrsr
Or do 3 throtle bodies on a plenum, what ever gives the highest velocity seems to work best for allround performance.
Dave
SVS and no ratcheting case does not make for a friendly river boat.
Edit: Charlie I remember you saying something about you made your case ratchet by changing the clutch dog? Might make SVS a decent option
my 3 litre sportmaster cases are all set up to ratchet. i definetely want to retain the common plenum for good idle quality and eventually getting the map sensor to work. i think a common plenum(or box of sorts) w/ 2 throttle bodies on it would work. i think also if i had rolled the throttle body 90 deg like the older bridgeports i wouldn't be seeing the air issue at part throttle-something to think about-but its funny that merc changed to a horizontal throttle shaft from vertical-wonder why?
Yep, I need to mock everything up again, tomorrow if I get some time I'll get everything unboxed and set it up. I thinkI found somebody locally to work out a set of rods for me too, but that is another battle.Quote:
Originally Posted by PanRonnie
The updrafts sucked up water, center horns always have had air balance issues, the down drafts are okay but there is still an issue with 1 and 2, the svs is great, save for the non ratchet issue. I have a 2.5 set up and was stuck with my back up case which is a no ratcher and like baja said it was literally an eye popper when I chopped the throttle.
Quote:
Originally Posted by Dave Strong
Dave,
I bought one of Tony's SVS and used it on my (now sold) 3L 250 EFI and it was a great improvement over the OEM backward 4 butterfly intake. I think one of the big benefits of that intake system is a straighter flow of incoming air rather than the current top mounted T/B. I think that's where Charlie is trying to go, even and straight air flow............
http://i177.photobucket.com/albums/w...s/IMG_1185.jpg
but you still lack a common plenum which helps low and mid range torque
True Charlie, but I'm just making reference in a stk OEM 4 blade then a swap to SVS. :iagree: 100% that an air box/plenum would be a big plus using front mounted 2 or 3 T/B's. I guess somebody is gonna have to start designing a longer (FWD) pan and cowl so we can get a decent size plenum in there..........Hey Mike Nass, you listening to all this..........LOL.Quote:
Originally Posted by mrcrsr
definetely on a laser injected style engine an svs would make for a dramatic improvement. the next plenum i build will be a clean sheet design, and i should be able to build a larger plenum because i don't have to worry about the velocity stack part of the horn. i do have a couple of throttle bodies here off a 4.6 mustang, but i haven't measured them yet to see what the size is- don't want to overdo it!
I had a MAD EFI 3 horn intake that I so much wanted to mod up by cutting most of the air horns off in order to gain clearence for moving it forward by putting a plenum chamber in between. The MAD intake made some awesome power but it just wasn't very user friendly at idle.
how about building some torque into it :eek: :thumbsup:
:iagree: That would surely add some torque value, nice long runners in a compact set up.......
you aint kidding there, remember the old gm tpi engines, built great torque but were done by 4500 rpm
Yeah Charlie, its a shame you can't have it all in one package, ya either give up the low end to make HP on the big end or vise versa.
I'm work'n on putting a couple "Knock Sensor" on the motor @ 2 & 3 as a little added insurance. It'll be a stand alone (no interface w/PCM/ECU), but it'll let you know if your on the verge of trouble.
any particular systemQuote:
Originally Posted by Liberator*21
this is one i currently am looking at
but i just don,t know :nonod:
http://www.phormula.co.uk/KnockMonitor-KS-4.aspx