Unclefester Posted February 24, 2012 Share Posted February 24, 2012 Part two of the FestAire system for engines running an airbox is now finished. This is for an SV with the induction on the right side of the car ie UK driver's side, and will mean the airbox is drawing denser, cold air, rather than the hot air from under the bonnet. In practice these systems have been found to produce more power due to the denser charge. Ram-air effect will be minimal. http://farm8.staticflickr.com/7042/6779267868_8fbdc58598_b.jpg I still have a few very minor adjustments to make, and it doesn't have the rubber seals on yet, but it all fits well, there's room for engine movement, and it has a 100mm inlet neck. I will be testing an idea which may result in tunable resonance in the box, along with 70mm outer and 130mm inner trumpets. http://farm8.staticflickr.com/7056/6925384523_7f916724b3_b.jpg http://farm8.staticflickr.com/7210/6779267704_2ea5fbe4c2_b.jpg I will probably move the outer wall of the side scoop out to meet the inside of the nosecone, for a bit more ram effect. http://farm8.staticflickr.com/7061/6779265946_f58057a2ac_b.jpg Edited by - Unclefester on 24 Feb 2012 12:23:46 Link to comment Share on other sites More sharing options...
TomB Posted February 24, 2012 Share Posted February 24, 2012 Wow! Looks really impressive. What is the front air box/ channel made of - looks like GRP? Link to comment Share on other sites More sharing options...
Unclefester Posted February 24, 2012 Author Share Posted February 24, 2012 Both airbox and collector are 100% GRP. If anyone wants a replica I'd make a mould, and the reps would be much better finished, stronger and lighter than this one off, as it's made of separate panels and mouldings all bonded together. I'd need to modify it to fit a CRS. Link to comment Share on other sites More sharing options...
TomB Posted February 24, 2012 Share Posted February 24, 2012 Ive seen a few of these now, and Im wondering about looking into it for my S3 on the KV6 throttle bodies. I dont think I have the space for an airbox, but the cold air funnelling over the radiator would be useful if nothing else but to feed cooler air to the big filter. Link to comment Share on other sites More sharing options...
Unclefester Posted February 24, 2012 Author Share Posted February 24, 2012 KV6? As in VHPD on the swan neck manifold? The ones on this SV are Titan Phantoms, as used by PTP on the Lotus Exige engines, but I don't think I've seen KV6 TBs. Edited by - Unclefester on 24 Feb 2012 12:48:45 Link to comment Share on other sites More sharing options...
TomB Posted February 24, 2012 Share Posted February 24, 2012 They are the old SLR throttle bodies, aka 'swan neck,'SLR',or 'KV6'. They are a pair of the Rover KV6 throttle bodies on a custom manifold. Link to comment Share on other sites More sharing options...
Unclefester Posted February 24, 2012 Author Share Posted February 24, 2012 Sp they probably stick up at more of an angle than the Jenvey TBs? I know the Scouse box is made for Jenveys. Link to comment Share on other sites More sharing options...
James_Russell Posted February 24, 2012 Share Posted February 24, 2012 Very nicely done and a very good idea. P.S. what are those trippy looking tyres, I've never seen those before! ETA: look at those poor brake discs- take the blasted thing for a drive! Edited by - James_Russell on 24 Feb 2012 12:56:44 Link to comment Share on other sites More sharing options...
Unclefester Posted February 24, 2012 Author Share Posted February 24, 2012 Quoting James_Russell: Very nicely done and a very good idea. P.S. what are those trippy looking tyres, I've never seen those before! ETA: look at those poor brake discs- take the blasted thing for a drive! Edited by - James_Russell on 24 Feb 2012 12:56:44 Tyres are Dunlop, not quite sure what type, and pre 2006 so need changing. The car has been standing since 2006, hence the brown discs. It will be fired up sometime very soon! 😬 Mind you, a day in 10° 'spirit vinegar' will have the discs like new. Edited by - Unclefester on 24 Feb 2012 13:44:55 Link to comment Share on other sites More sharing options...
Unclefester Posted July 4, 2012 Author Share Posted July 4, 2012 After much messing about, I have the intake trumpets fitted. Slight problems with materials, supply, and machining.....but they are spot-on. http://farm8.staticflickr.com/7112/7501091182_4b7c9e13bd_b.jpg http://farm9.staticflickr.com/8288/7501088480_c0076c15f3_b.jpg http://farm8.staticflickr.com/7270/7501089990_a32a7f494f_b.jpg A few more small things to sort out, and she should be ready to fire up for the first time in more than 6 years! This has to be one of the lowest mileage 2002 SVs around. We decided to keep it and go through the silly French homologation process. Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted July 4, 2012 Share Posted July 4, 2012 Hi Nick - look forward to comparing it to a 55,000-mile 2002 SV in a couple of weeks Link to comment Share on other sites More sharing options...
Unclefester Posted July 4, 2012 Author Share Posted July 4, 2012 Hi! I just hope it IS running by then..... Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted July 4, 2012 Share Posted July 4, 2012 That is an awesome job, good work 😶🌫️ Link to comment Share on other sites More sharing options...
AMMO Posted July 4, 2012 Share Posted July 4, 2012 Nice work. Link to comment Share on other sites More sharing options...
LesG Posted July 5, 2012 Share Posted July 5, 2012 What a cracking job, well done! Link to comment Share on other sites More sharing options...
Rattie Posted July 6, 2012 Share Posted July 6, 2012 Out of interest, why are the trumpets wildly different lengths? Link to comment Share on other sites More sharing options...
Unclefester Posted September 13, 2012 Author Share Posted September 13, 2012 Quoting Rattie: Out of interest, why are the trumpets wildly different lengths? The long ones(130mm) give better mid range power and torque, the short ones at 100mm give better top end power. This gives a much rounder overall performance and is used on Elise racers in a more extreme form....have you seen the size of the Scouse Elise race airboxes? Edited by - Unclefester on 1 Oct 2012 19:43:02 Link to comment Share on other sites More sharing options...
EFA Posted September 14, 2012 Share Posted September 14, 2012 Do you have any rolling road back to back comparisons on that? Link to comment Share on other sites More sharing options...
Unclefester Posted September 14, 2012 Author Share Posted September 14, 2012 Dave Walker does. Have you checked his article on variable trumpet lengths? Very interesting stuff. It's on the Emerald site. Edited by - Unclefester on 14 Sep 2012 22:14:39 Link to comment Share on other sites More sharing options...
EFA Posted September 15, 2012 Share Posted September 15, 2012 There is no doubt that longer inlets improve torque, but what alarms me is having fixed differing lengths on the induction. The inlet pulses will be very imbalanced - cannot do the engine much good, and at very high revs I would suggest these loadings could initiate a failure. Link to comment Share on other sites More sharing options...
Unclefester Posted September 16, 2012 Author Share Posted September 16, 2012 All I can say is that this system is being used with success and I've not heard of any failures attributed to the use of different length inlet stacks. They are used in race Elise engines and seem to give the best of both worlds. Mid range AND top end. My initial reaction to the concept was the same as EFAs, but I became convinced. There again, I also am convinced that secondary 'fine' oil filtration is a good idea....and that removing condensate from oil in an engine is useful. Ultimately, you believe whatever suits you. Link to comment Share on other sites More sharing options...
Unclefester Posted September 26, 2012 Author Share Posted September 26, 2012 I noticed the other day that Porsche used exactly the same difference, 30mm, in the induction stacks on the Harley-Davidson V-rod design! One short and one long stack on the V twin watercooled, 4 valve per cylinder design. This is an engine which produces 135bhp from 1250cc. Link to comment Share on other sites More sharing options...
kenny. Posted September 26, 2012 Share Posted September 26, 2012 TVR trumpets are unequal lengths on the RV8s Link to comment Share on other sites More sharing options...
Unclefester Posted September 26, 2012 Author Share Posted September 26, 2012 Quoting kenny.: TVR trumpets are unequal lengths on the RV8s Do you know what the difference is, in mm? Link to comment Share on other sites More sharing options...
Jason Plato Posted September 26, 2012 Share Posted September 26, 2012 I did the different lengths back in 2005, the upshot was plus circa 20ftlb in the mid with no loss of top end . do a search for variable length and my thread should be there somewhere :) Link to comment Share on other sites More sharing options...
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