BarryC Posted July 27, 2020 Report Share Posted July 27, 2020 1. The PO on rebuild fitted the 3 x (paired) K&N filters in place of the plenum/ air box arrangement. However the planum/ air box type radiator cowl has been retained as an open void- presumably to allow a greater amount of cool air to the filters. However I am concerned thus that too much air is not being directed to the radiator/ not enough through the radiator. An electric 'pusher' fan is fitted, and consequentially the fan is also maybe needing to work more than necessary I am considering replacing the retained cowl with the 'carburettor' (enclosed) version , with a void cut and covered with a mesh. What is the normal solution with the 3x K&N filter arrangement. If the foregoing, what size void is recommended. 2. With the 3xK&N 's the air bleed hose (to plenum) has been replaced with the 50mm. K&N filter which creates, in particular in 'tick over', an audible 'sucking' noise previously absorbed via the hose to the plenum. Is there an alternative arrangement for the air bleed to be facilitated into the clean air requirement- given retention of the 3xK&N arrangement. Thanks Quote Link to post Share on other sites
OldBob Posted July 27, 2020 Report Share Posted July 27, 2020 Hi Barry, I have the 3 x K&N setup and a rad cowl as you describe, however my vehicle retains the air filter housing fitted with a filter inside. If you copy this arrangement your existing rad cowl can be retained and any air pressure loss at the radiator you are concerned about should be avoided. Your second point, I also have the 50mm filter fitted to the air screw and mine also makes an unpleasant noise. I haven'texperimented but would think relocating the filter lower down on a longer pipe should help. Let me know if it does ! Bob Quote Link to post Share on other sites
BarryC Posted July 27, 2020 Author Report Share Posted July 27, 2020 Thanks Bob for your early response, 1. The retaining of the air box is very interesting - the PO included the original air box & plenum in the 'bits & bobs package so I can refurb & use the box. Am I correct in assuming the air passing through the 'box' with the filter installed exits directly into the open engine bay. - the arrangement principal function to effectively create 'resistance'. 2. Thanks for your thoughts - good idea - will experiment at some point. Thanks again. Quote Link to post Share on other sites
OldBob Posted July 27, 2020 Report Share Posted July 27, 2020 Hi Barry, Yes, the air filter housing just adds a baffle effect, mine exits into the engine bay, no pipework is used. If you have the parts then you may as well try this setup. Bob Quote Link to post Share on other sites
OldBob Posted July 27, 2020 Report Share Posted July 27, 2020 In case of any misunderstanding..... Quote Link to post Share on other sites
BarryC Posted July 28, 2020 Author Report Share Posted July 28, 2020 Thanks Bob. Fully understood and K&N's otherwise as mine . Great help. Quote Link to post Share on other sites
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