john.r.davies Posted October 5, 2020 Report Share Posted October 5, 2020 I'll make you one, Jochems! Just send me an OE tube, so I can reuse the trumpets. Quote Link to post Share on other sites
JochemsTR Posted October 29, 2020 Author Report Share Posted October 29, 2020 (edited) ...this is how a 5" plenum with 5" K&N Filter looks like....powder coat pending Hopefully a little test-drive this weekend (weather permitting) and see if I need to adjust my fuel table... Jochem PS Matt, many thanks ! Edited October 29, 2020 by JochemsTR Quote Link to post Share on other sites
TRTOM2498PI Posted October 29, 2020 Report Share Posted October 29, 2020 Hi Jochem, Looks great ! Good luck, and good job by the looks of it ! Cheers. Quote Link to post Share on other sites
john.r.davies Posted October 29, 2020 Report Share Posted October 29, 2020 Very nice, Jochems! Who did it for you? John Quote Link to post Share on other sites
JochemsTR Posted October 29, 2020 Author Report Share Posted October 29, 2020 18 minutes ago, john.r.davies said: Very nice, Jochems! Who did it for you? Matt did.....and an excellent Job! Jochem Quote Link to post Share on other sites
john.r.davies Posted October 29, 2020 Report Share Posted October 29, 2020 Is he a pro, or an amateur, like me? If the first, then his business deserves a mention! JOhn Quote Link to post Share on other sites
JochemsTR Posted October 29, 2020 Author Report Share Posted October 29, 2020 12 minutes ago, john.r.davies said: Is he a pro, or an amateur, like me? If the first, then his business deserves a mention! JOhn Matt also posted in this thread...you can see his work a few messages back... Quote Link to post Share on other sites
john.r.davies Posted October 29, 2020 Report Share Posted October 29, 2020 1 hour ago, JochemsTR said: Matt also posted in this thread...you can see his work a few messages back... mtrehy? Quote Link to post Share on other sites
mtrehy Posted October 29, 2020 Report Share Posted October 29, 2020 19 hours ago, JochemsTR said: ...this is how a 5" plenum with 5" K&N Filter looks like....powder coat pending Hopefully a little test-drive this weekend (weather permitting) and see if I need to adjust my fuel table... Jochem PS Matt, many thanks ! My pleasure! Quote Link to post Share on other sites
JochemsTR Posted December 5, 2020 Author Report Share Posted December 5, 2020 (edited) I really do not want to overdo it on this topic, but I remain curious. and I am sure I am not the first one experimenting... Any ideas or thoughts regarding the outcome of installing such a fan in the air intake, so actively forcing air into the plenum? The fan would be controlled by the TPS Sensor, so no support during Idle, but rather during driving and WOT. Jochem PS Picture is a sample, ofcourse it runs with 12V Edited December 5, 2020 by JochemsTR Quote Link to post Share on other sites
Drewmotty Posted December 5, 2020 Report Share Posted December 5, 2020 A baby fan isn’t going to shift anything like the requirements of your 2.5 litre “air pump” it will just restrict the inlet. That’s why we have superchargers. Quote Link to post Share on other sites
Casar66 Posted December 5, 2020 Report Share Posted December 5, 2020 (edited) Nope, the fan will not do it. The size and the position of the K&N is also not optimal. You need a ram-air-system or a charger. Without that I doubt that the bigger plenum will bring any significant increase of power. Edited December 5, 2020 by Casar66 Quote Link to post Share on other sites
john.r.davies Posted December 5, 2020 Report Share Posted December 5, 2020 2 hours ago, Drewmotty said: A baby fan isn’t going to shift anything like the requirements of your 2.5 litre “air pump” it will just restrict the inlet. That’s why we have superchargers. Absolutely! Just do the maths, Jochem! 2.5L at 5000rpm demands just under 16,000 Liters of air! (2.5x2500) Quote Link to post Share on other sites
JochemsTR Posted December 5, 2020 Author Report Share Posted December 5, 2020 Fair enough.... no use pursueing Jochem Quote Link to post Share on other sites
Waldi Posted December 5, 2020 Report Share Posted December 5, 2020 Gross 6250 liter/min for the record at 5000 rpm. As a boy I tested a large funnel on my moped (Zundapp KS50 watercooled). It gave no noticable difference. Waldi Quote Link to post Share on other sites
jerrytr5 Posted December 5, 2020 Report Share Posted December 5, 2020 I ran mine up the road without the bonnet on with open inlets to test something once. The intake roar is just unbelievable and will give you goosebumps. It's worth doing just for the hell of it. John, best not try that with the Vitesse. Jerry Quote Link to post Share on other sites
TriumphV8 Posted December 6, 2020 Report Share Posted December 6, 2020 If I do my calculation correctly we will have around 6000 litres air intake because we do not not fill 100% at high revs. The inlet area with 5" will give 121cm² and with a rate of 100 litres per second it will be only 9m/sec airspeed. That is pretty low, in the inlet liners the speed should be limited to 80m/sec. So I would be interested to see if just the increase of diametre from a quite low flow rate before will increase power. I found out removing air filter box will lean engine and so wil increase power if properly set but copy this air box is a lot of work and it would be nice to see before if that makes additional sense. Quote Link to post Share on other sites
trolleybus Posted December 6, 2020 Report Share Posted December 6, 2020 I did a lot of research before fitting EFI to my 2500 sedan with CP cam. I came up with: The volume of the plenum should be 85% of the swept volume of the engine, for best results use a single throttle body and the longer the connecting tubes the better the torque. Quote Link to post Share on other sites
harrytr5 Posted December 6, 2020 Report Share Posted December 6, 2020 A mate of mine increased the size of the airbox and made all the parts himself including the trumpets. He found the pick up was very noticeable around 3500 rpm but torque suffered at low rpm. This is on EFI and single throttle body. Maybe back on the rolling road (Emerald) for adjustments on the fuel curve. Regards Harry Quote Link to post Share on other sites
PodOne Posted December 6, 2020 Report Share Posted December 6, 2020 Fit a turbo with EFI and have done with it! Counting to ten and looking for a place to hide. Andy Quote Link to post Share on other sites
john.r.davies Posted December 6, 2020 Report Share Posted December 6, 2020 (edited) No argument with the statements above, but I'd love to know where they come from/their authority. TV8 - "the inlet liners the speed should be limited to 80m/sec." and trolleybus: "The volume of the plenum should be 85% of the swept volume of the engine" Can you provide references, please? Books, papers? Edited December 6, 2020 by john.r.davies Quote Link to post Share on other sites
CK's TR6 Posted December 6, 2020 Report Share Posted December 6, 2020 Here is a larger plenum, single throttle body, extended length runner EFI intake featuring heat blocks on each runner. From individual bell inside the plenum to the intake valve is 19.5”. With a TSI cam that is a flat torque curve, this increased torque in the 3200 rpm area at the cost of breathing above 5000 rpm. Quote Link to post Share on other sites
john.r.davies Posted December 6, 2020 Report Share Posted December 6, 2020 Work of Art, CK! Quote Link to post Share on other sites
CK's TR6 Posted December 7, 2020 Report Share Posted December 7, 2020 Another view. Quote Link to post Share on other sites
Waldi Posted December 7, 2020 Report Share Posted December 7, 2020 Wow! Quote Link to post Share on other sites
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