113db? Best not use your car for early morning commuting..
At the moment, Splat (XI), Mooch (SDV) and yourself are not able to do Hullavington in March. I'm inclined to postpone myself until April when we can get a few more of us together. I can't really spend the cash on both when I've got to fund my new manifold and carb rebuild. Seajayare is interested in coming over, too. It'll be a great opportunity to see some different builds and I'm always up for giving as many pax laps as anyone wants until they are bored/car-sick (delete as applicable).
The Fri Apr 15th day is also in the WSCC Cotswolds Area diary as a gathering, so sould be a great bunch of like-minded owners there among the Atom and Rice-Racer mentalists. I'll find out on 15th is it's possible for me to attend.
Depending on your exhaust set-up, and if you're stuck, I might be able to borrow locally from a selection of track-silencers.
if you're aiming for a trackday, I'll try to come along and play.
I've only speed-read a third of your thread (sorry, been a bit absent recently), but I got 110bhp-ish at the flywheel with a maniflow manifold and surprisingly few trick bits. It was measured by an old boy in his shed on a 1950's set of rollers and a hand-written printout, but I'm sticking with it and if anything I'd say it's calibrated on the light side of accurate
Hi Jon, I made a mistake! which I didn't notice on the last post, should have been 103db's.
April would suit me better for Track day meet.
All the very best Malc.
I've just spoken with a very helpful lady at MSE. They noise test at 4500 as it's the lowest they can test at. Engines that rev to over 7500 are tested at 3/4 revs. That's V-TEC screamers as well as bike engines.
Having cured a little "pop" I had, I will be re-testing myself at 4500RPM, 0.5m at 45deg angle. Weighting scale is (A).
Seeing as the WSCC crowd are going, I asked if there was the opportunity for a deal on the Hedtec helmets. I'll be in contact with Natterjack (Cotswolds AO) to see if this has been considered and if a deal can be done.
Sound is measured on a log scale, so 3db is in fact a halving of the sound pressure level (IIRC)!
But should not be that difficult to achieve. Unfortunately there is probably a +/- 3db variation between any two noise meters, especially when you add the human factors into positioning. Sometimes works in your favour, sometime against you.
I've resorted to sticking a baffle into my silencer until i can make something that will both fit and get me comfortably under 105db.
Going for a 24" long 7 x 4" oval section design. Likely with some small deflectors in the bore to encourage the gas to loose some of its energy into the wadding.
Has anyone tried one of the Supertrapp silencers that fit onto the end of the pipe, with the discs? Rather than the usual Supertrapp muffler, it is just the disc holder. You can add and subtract the number of discs until you get the sound level you are looking for. www.supertrapp.com
I am sure that this could be welded to a pipe that could be attached to the muffler outlet pipe, perhaps using a Marmon clamp and flange. This would make it easy to attach or remove, and the flange would not look out of place on the end of the exhaust tip.
Oh what a small world it is................ (Pay attention Jon. There's an observational test for you coming up!)
Since leaving behind flying instruction, and hence penury, some fifteen years ago, I've run a string of interesting (and sometimes even exotic) motors. For my first nine years at Heathrow my tiny garage in Windsor held a semi-road legal Kawasaki ZXR750R, whilst I ran firstly an Elan SE (the FWD '90s turbo car) then an Esprit GT3, Esprit V8GT and finally an F355 Berlinetta as my everyday motors, all parked outside and used all year round.
The Ferrari made the move to Andover with me and lived in the garage for a while, until the expense and hassle of running a by now 14-year old Fezza on a 120 mile round-trip commute proved too much. It made way for an Avantime (trust me, it was great!) and then for my current daily smoker.
Ah, the garage! My greatest compromise.......... The house is great (three Elizabethan cottages knocked into one) but I wanted much more in the way of garaging. The double-length single isn't bad (the end is subdivided to provide two "sheds" leaving enough room for a good-sized single garage/workshop), but it's not the triple with pit and lift that I'd like!! When I bought the Eleven as a project to get me away from the constant DIY project that is the house, the Fezza was turfed out into the rain and snow once again.
So, whilst my garage space is taken up with the Eleven, my daily smoker has to live outside. But, as you can see, I seldom run a mass-produced saloon as my commuting car. And I've grown accustomed to the slight hassle of having to travel quite some distance for specialist servicing (the Ferrari has been the most common of all the cars that I've owned since 1998!). My current car is one of about 450 of it's kind in the UK and I've been running it for 15 months. I dropped it off for it's annual service on Monday and picked it up this afternoon. The chap who works on it for me is excellent and also very chatty. He knows all about my Eleven and it came out in conversation that he'd told his father, who's often around the workshop, that I owned one too, when an Eleven was resident in the unit next door, having it's corner weights done.
