Esprit Aviation Posted November 7, 2007 Report Share Posted November 7, 2007 (edited) Michael, Thanks for the info. The pic of your engine is fantastic! I remember speaking to you about transaxle conversions and the like, many years ago. At that time you were trying to achieve 350HP. How much HP have you been able to get out of it recently; and do you have any other plans for more? The idea of adding the spacer seems to be a great idea, but I am wondering if it has increased lag time due to a larger volume that must be pressurized. Have you noticed any difference or dynoed since the change? It is good to see you on the forum! Scott, Should the progression from the front to back be that smooth or should there be more of a 'wall' around the mouth of the trumpet to prevent pressure variations around the mouth from disturbing the incoming air? Otherwise they are smooooooooth! Lee Edited November 7, 2007 by Esprit Aviation Quote KILL THE RUST! RUST REMOVAL Link to comment Share on other sites More sharing options...
hilly Posted November 9, 2007 Report Share Posted November 9, 2007 That original one it the last picture deffo looks different to the NA stacks. The NA units have less of a radius and are longer, so Lotus obviously did just fit any old thing onto the Turbo. Hilly Quote 1981 S3 4.2 V8 6 speed (The Mutant) Mutant V8 Conversion Thread Knowledge is power .................... apparently. Link to comment Share on other sites More sharing options...
f1karting Posted November 10, 2007 Author Report Share Posted November 10, 2007 (edited) That original one it the last picture deffo looks different to the NA stacks. The NA units have less of a radius and are longer, so Lotus obviously did just fit any old thing onto the Turbo. Hilly Both my S3T cars have the long (45mm) stacks.. Budz stacks may be the ones used on the DHLA 40?? Edited November 10, 2007 by f1karting Quote If you set no goals you shall surely reach them.. Link to comment Share on other sites More sharing options...
Esprit Aviation Posted November 25, 2007 Report Share Posted November 25, 2007 Jan, anything new on the 25 mm stacks? Quote KILL THE RUST! RUST REMOVAL Link to comment Share on other sites More sharing options...
f1karting Posted November 26, 2007 Author Report Share Posted November 26, 2007 Jan, anything new on the 25 mm stacks? nothing yet Lee... I haven't actually had time to dig any deeper or order anything. Quote If you set no goals you shall surely reach them.. Link to comment Share on other sites More sharing options...
USAndretti42 Posted November 28, 2007 Report Share Posted November 28, 2007 They certainly look nice but I have no idea what effect on the engine performance will be. On the IRL engine we tried full radius trumpet entries and they made no difference whatsoever and on that airbox the air comes down the airhorn, hits the bottom, runs up the outside walls and round the back of the trumpets and into the engine. Be interesting to see any dyno results you get. Quote S4 Elan, Elan +2S, Federal-spec, World Championship Edition S2 Esprit #42, S1 Elise, Excel SE Link to comment Share on other sites More sharing options...
bosbon_be Posted November 28, 2007 Report Share Posted November 28, 2007 Ferrari F1 cars use variable trumpets, as you can see in this picture. You will have a black trumpet that ends with a bleu seal then the carbon trumpet take over, the carbon part can move up and down. Anybody can get these pictures now That set up would end this discussion Quote Link to comment Share on other sites More sharing options...
f1karting Posted November 29, 2007 Author Report Share Posted November 29, 2007 (edited) Ferrari F1 cars use variable trumpets, as you can see in this picture. You will have a black trumpet that ends with a bleu seal then the carbon trumpet take over, the carbon part can move up and down. NICE... Anybody can get these pictures now TELL US PLEASE... That set up would end this discussion AND START A NEW ONE.... Nice pix!! Trick is we only have a small space to work in.. the next discussion would be the design of the "new" airbox and how to control the VTL Edited November 29, 2007 by f1karting Quote If you set no goals you shall surely reach them.. Link to comment Share on other sites More sharing options...
Brandt Posted December 31, 2007 Report Share Posted December 31, 2007 When overhauling the carburetors on my 83 S3 Turbo I found that there was NO trumpets! I was overhauling the carburetors because the Lotus was stumbling, and it is alot better now, but still not perfect. (At least the hesitation seem to be gone now. ) How much will the lack of trumpets influence this? The other question is, what is the difference between 16mm trumpets and no trumpets? Brandt Quote Link to comment Share on other sites More sharing options...
f1karting Posted January 3, 2008 Author Report Share Posted January 3, 2008 When overhauling the carburetors on my 83 S3 Turbo I found that there was NO trumpets! I was overhauling the carburetors because the Lotus was stumbling, and it is alot better now, but still not perfect. (At least the hesitation seem to be gone now. ) How much will the lack of trumpets influence this? The other question is, what is the difference between 16mm trumpets and no trumpets? Brandt Seems to me that it is likely that no trumpets would be better than the stock ones... If you could simply added a radius plate to the inlet that would be better. However, if you can get some OE 45mm stacks and have them shortened to 25mm that would work 100%. What seems to be wrong with the running? J Quote If you set no goals you shall surely reach them.. Link to comment Share on other sites More sharing options...
Brandt Posted January 6, 2008 Report Share Posted January 6, 2008 Jan, I've found some local machine shop to make me 16mm trumpets according to my design, according to the discussion on this thread. I'll post some pics once I get the trumpets. As for the stumble, I think the best description will be a mis-fire. New sparkplugs and leads made no difference, and the rotor and cap looks very new still. So I'm starting to suspect the coil, as was found in another thread. The jets are however still as Lotus specified them, and I suspect thus the mixture may be lean. Will I notice problems with lean mixture only at full throttle? And now for my biggest worry. As far as I can tell, I have a NA head on my turbo engine. I say this because the water plumbing makes sense for the NA head. Thus I believe the setup is as follows: 1) NA head 2) Turbo cams 3) NA inlet manifold 4) NA water pump with thermostat (Also the turbo Y-type thermostat is also still there, thus there are 2 themostats in the system!) 5) DHLA 40 carburettors with Lotus specified turbo jets 6) Turbo exhaust manifold 7) the block say 910, so at least it should be a turbo block, (and hopefully turbo pistons, etc) So, I know the cooling of the NA head is not that good, but what other problems can I expect? Quote Link to comment Share on other sites More sharing options...
f1karting Posted January 11, 2008 Author Report Share Posted January 11, 2008 (edited) Look forward to seeing the trumpets.. as to the other questions, I have no experience with your combination and cant offer much help. I would put in all new ignition, arrange some dyno time to do some runs to get a baseline to see where you are with your setup, and go from there. Edited January 13, 2008 by USAndretti42 Removed a huge quote which was the previous post Quote If you set no goals you shall surely reach them.. Link to comment Share on other sites More sharing options...
Esprit Aviation Posted January 11, 2008 Report Share Posted January 11, 2008 Jan, I obtained one pair of 25mm trumpets on E-bay, but the other ones went off before I realized, so I'm stuck w/ just one pair. If I can find out who made them I'll get another pair. I will try to post a pic of them, so that if you locate some, you could borrow my two for testing. Lee Quote KILL THE RUST! RUST REMOVAL Link to comment Share on other sites More sharing options...
f1karting Posted January 12, 2008 Author Report Share Posted January 12, 2008 (edited) sounds good.. Edited January 13, 2008 by USAndretti42 Removed quote Quote If you set no goals you shall surely reach them.. Link to comment Share on other sites More sharing options...
Brandt Posted January 28, 2008 Report Share Posted January 28, 2008 Finally some pics of the trumpets Iv'e had made. They are are 16mm high, but have a nice 10mm radius to guide the air in. Unfortunately I haven't taken the car for a drive yet, so I'll still have to see if they made any diffrence. Buddsy, thanks for the advice on the outlet valves, clearly I will have to find a turbo head for my car. Quote Link to comment Share on other sites More sharing options...
PER Posted January 28, 2008 Report Share Posted January 28, 2008 Cheers. We can find all sorts of trumpets here..... http://www.dellorto.co.uk/merchandise/prod...artsectionID=41 I've just bought a rebuild kit for my carbs here. Quote Link to comment Share on other sites More sharing options...
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