carbz Member 118 Member For: 14y 11m 21d Gender: Male Location: Townsville Posted 29/05/10 12:37 PM Author Share Posted 29/05/10 12:37 PM not sure whether I will be flow testing it. depends how I feel once iv finished it and if there is some1 near by that does does flow testing.well I wanted to go with the single holes originally but a few engineers at work thought it would be better with 2 single holes.I ended up going with single holes after what austcro said and because a few of the other manufacturers changed to single holes for a reason and thought that they would have done alot of r&d and figured out which one works best so I went with that.I will get a few pics of it during the construction stage Link to comment Share on other sites More sharing options...
SPIKO Gold Donating Members 1,924 Member For: 19y 9m 7d Gender: Male Posted 29/05/10 10:47 PM Share Posted 29/05/10 10:47 PM The plenum is very similar in design to a well known supplier? Why would you go to all this trouble if your not re-inventing the wheel?? I admire your passion but Link to comment Share on other sites More sharing options...
jdcustom Member 44 Member For: 16y 2m 6d Gender: Male Posted 30/05/10 01:53 AM Share Posted 30/05/10 01:53 AM what happened to my pics????I sent back advertiser forms 2 weeks ago??jamie Link to comment Share on other sites More sharing options...
carbz Member 118 Member For: 14y 11m 21d Gender: Male Location: Townsville Posted 30/05/10 02:36 AM Author Share Posted 30/05/10 02:36 AM I seen your photos you uploaded then a heap of posts were removed for some reason.the reason I dont just go buy 1 is because I like to make the stuff myself and I also figured if I want to change it to slots then I can always machine out the center pieces to slots either way (north to south or east to west) Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 7m 28d Gender: Male Location: adelaide hills- 'race air' central Posted 30/05/10 03:24 AM Share Posted 30/05/10 03:24 AM go for it! more competition means better prices for the buyer! Link to comment Share on other sites More sharing options...
icer Banned 2,335 Member For: 15y 5m 28d Gender: Male Location: Aspendale, Vic. Posted 30/05/10 05:17 AM Share Posted 30/05/10 05:17 AM maybe he can provide it for half the price spiro :D Link to comment Share on other sites More sharing options...
Paulie2256 Donating Members 7,441 Member For: 16y 1m 23d Gender: Male Location: SE Melbourne Posted 30/05/10 07:04 AM Share Posted 30/05/10 07:04 AM The plenum is very similar in design to a well known supplier? Why would you go to all this trouble if your not re-inventing the wheel?? I admire your passion but Same reason why you are doing what you are.... cause you can Link to comment Share on other sites More sharing options...
Smoke them tyres Member 557 Member For: 17y 23d Gender: Male Location: Brisbane Posted 30/05/10 12:12 PM Share Posted 30/05/10 12:12 PM Why do all these plenums use all 12 holes?From what I can see, I would only use the main round ones. They are also cast as a bellmouth on the lower plenum anyway. From my knowledge, intake systems work best with a constant acceleration towards the valve (ala sportsbikes intake ports). These plenums have moderate speed through the ducting, completely slow down in the plenum, speed up through the 12 individual ports, slow down again as they merge and then speed up in the remainder of the lower runner and intake port. A lot of wasted energy. Also, less than optimum off boost throttle response.Also, I don't see how each cylinder can get equal filling under vacuum AND boost due to their "funnelling" of airflow.Volume is one thing, but efficiency and effectiveness is another. Cylinder fill should be equal across ALL cylinders as these engines are not tuned on a cylinder by cylinder basis......perhaps why the std manifold upper is the way it is????....no lean or rich cylinders.I have found that the std upper and lower is not so bad (within limits). A thin sheet laser cut to block off the D shaped long runner ports and flatten the stupid oval hole/depression that the throttle feeds directly onto has sharpened up throttle response quite well and the engine now feels responsive to input instead of "somewhat lazy" off boost and in the 90-100k/hr cruise zone. Cruise litres/100km has gone from 9.5 to 8.5 as a little more velocity and cylinder fill has been gained. Boost response is unchanged, but car is much nicer to drive now.Plenums would appear to solve the volume issue on higher powered cars, but I would be glad to give up a few kw to have a sweet combination on and off boost. Can't say that I would "feed" the airflow to the engine this way for driveability and reliability.Just my 5 cents worth...... Link to comment Share on other sites More sharing options...
carbz Member 118 Member For: 14y 11m 21d Gender: Male Location: Townsville Posted 09/06/10 09:56 AM Author Share Posted 09/06/10 09:56 AM Bit of an update.parts turned up today. decided that I would make up a surge tank at the same time.The Laser cutters stuffed up my order and I now have an extra set of parts so ill probs be making up a 2nd plenum. Link to comment Share on other sites More sharing options...
orangeute338 Suspended 260 Member For: 16y 5m 15d Gender: Male Posted 09/06/10 12:55 PM Share Posted 09/06/10 12:55 PM how much did the laser cutting cost? I was wondering about getting stuff done in the future if its not to expensive....I ended up just cutting all my suff with a plasma cutter.what size plate is that? and what grade? what filler rod will you use?I made one up, but mine keeps blowing out the welds, square corners arnt very strong under pressure, that's why you never see pressure vessles that arnt roundI used a old sign for my box so probably not the best alloy and it was only 3mm thick....I bored out the bottom half on the mill to make nice big ovals then I welded the bottom plate to the lower runners then boxed it up so its all once bit, no bolts.Im not so sure the front facing is that great yeah it makes it heaps cooler, you could pull up and put ya hand on the throttle body and the front of the plenum and it was ice cool, but who knows if all the airs going in evenly to each cylinder, like someone said on a small motor its ok but its a long motor to get and air to each one....plus I think changing it made the car a bit more laggy with not much noticable power difference...altho it was a long time between driving with stock plenum and after with new one.....the plenum is designed for atmo and ford just pull out the butterflys and put it on the turbo, cheaper probably then even making it for the n/a. so im sure there is improvement there....my new mod it to use a n/a plenum and put it on the turbo motor and hook up the butterflys to work off the boost, stay closed then open up at like 5psi. thinking it will keep the runners longer to make more torque down low then open up under boost to let it rev out, true dual length runners.... Link to comment Share on other sites More sharing options...
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