Loeb's time of 8:13 is absolutely mental! I know he has 4 wheels instead of 2 and a huge team behind him but that shouldn't detract from what was an incredible drive. He's cool as a cool thing too.
Trimix - Member
I actually thought the exhaust work was not that great, nice, but not the best
Agreed. If your mandrel bender can't produce a small enough radius then find someone whose does, or fabricate "half shells" instead to limit the weld lengths. F1 would laugh at you if you turned up with a "lobsterback" welded mess like that!
For example, Indycar exhaust turbine snail housings were originally hand formed/beaten from 1mm inconnel sheet! It took around 200man hrs of labour to make each one, and was an absolute nightmare to do. Fortunately, hydroforming/superplastic forming processes now means it's a lot easier!
But, it was a great program, and although i could easily make a better/faster bike than Guy, NO WAY could i ride it like him, especially up the Peak....... 😉
RaveyDavey - Member
Loeb's time of 8:13 is absolutely mental!
He's was also driving a car with massive aero assistance, which makes it a total Head-F*** to drive, as you need to go fast to get the grip, and tiny changes in yaw and ride height (bumps) massively change the grip levels. On a motorbike the corner speeds are pretty low (relatively) and it's more about getting out of each corner as cleanly as possible. (i'm not saying it's easy, far from it, but it's easier than driving an aero car to it's full performance without any run-off!)
I've had the "pleasure" to sit next to Loeb on a shakedown rally stage, and as far as i could tell he is actually psychic 😉
Going back to Ari Vatanen's run was a bit spooky. Just last Sunday I was out watching the Rally Cataluña up in the hills behind Tarragona, got talking to a couple of Irish guys and chatting about the old days of Pond, Arikkala, Blomqvist etc and who should walk past but Ari Vatanen. He stopped to talk and have photos with a few guys but I was too starstruck to get a photo.Bugger.
Mucho enjoy the programo' 😀
And let's not forget the woman who broke the mold Michele Mouton took it to the yanks when it was all beards and home made whacky races cars. She was awesome in a modded group B rally car.
and although i could easily make a better/faster bike than Guy
❗
He's been rolling that martek out of the van at races and shows for years and mostly not getting it to run so it's pretty par for the course. I had it down as an eternal project, so cool to see it race.
Just a point on that bike..
It's a hillclimb race, clearly fast hillclimb, so why no fairing/aero stuff on it ? Shirley that would make a whole lot of difference, no?
And another thing, why din't he just borrow one of those Suzuki's he rides in the TT? Ok, I get that he wanted to role this thing out of the shed and I've just answered my own question, but if it was for a record, then hey why not borrow a bike??
Anywhoo's, gotta love the thrill.
mandrel bender
I think I went to school with him.
The ride was pretty awesome but the real story vanished. Did Guy get the girl?
And another thing, why din't he just borrow one of those Suzuki's he rides in the TT? Ok, I get that he wanted to role this thing out of the shed and I've just answered my own question, but if it was for a record, then hey why not borrow a bike??
I guess it wouldn't have made such a good story as doing a "Burt Munro"
And another thing, why din't he just borrow one of those Suzuki's he rides in the TT? Ok, I get that he wanted to role this thing out of the shed and I've just answered my own question, but if it was for a record, then hey why not borrow a bike??
Having read interviews with him down the years mentioning this engine/bike he seems to have a bit of a love affair with it, it speaks to him more than 'standard' race bikes do. If you read his book he says he sees racing bikes as just a job, the same as fixing trucks. The Martell is something he seems to have a deep passion for.
(Yes I'm fully aware this post makes me sound like a weird fanboy, I'm not reall, I don't think...)
As for adjusting for altitude, isn't that the point of the turbo? As the air gets thinner it naturally tries to keep the set manifold pressure.
Might be bobins, anyway was more jellous of his workshop than anything else would love a lathe and miller at home.
Anyone watch roadkill? They made a manifold use 180 degree bends and cutting to suit. Seems a better way but again what do i know.
I hope he wears woolen pants because after his mate dobbing him in for wearing the same pair for five days before going round his house and having a shower and knicking his clothes knocked him down one notch in my books......still top bloke though and utterly enthralling to watch. Not really heard any bloke say, no cant stand the bloke.
Yes, it was bloody brilliant. Anyone who's raced must have sat watching with goosebumps, it stirred me passionately. I may not actually be able to sleep tonight through lying wishing I could get my ACU licence again.
Balls of steel, massive ones at that
Guy is incredibly entertaining to watch ...... makes me realise more than ever that Top Gear is just totally past its sell by date .... Sunday nights with Guy Martin would be way more entertaining.
Amusing thing ( other than the chat up lines on the girl ) was when he whipped out his Nokia 6310i to text ...... funnily enough I found an old one of mine in a drawer just last week.! That phone would last two weeks on a charge ..... if only phones now would do that!
More Guy Martin on TV though ... definitely .
bigdean - MemberAnyone watch roadkill? They made a manifold use 180 degree bends and cutting to suit. Seems a better way but again what do i know.
On that hemi? They just did pretty much whatever would fit in the car and look good I think, performance not much of a consideration.
Exhaust building always seems a bit of an arcane art, I remember reading an interview with Igor Akrapovic where he basically said with his experience and knowledge, full manufacturer support, and modern modelling software, he still expects to get a decent proportion of exhausts wrong on the first attempt. Though I imagine a "wrong" akrapovic is still better than most "right" exhausts.
Here's a proper custom exhaust, ceramic coated loveliness and sounds awesome when blipped, the sort of noise that make your balls bounce with glee.
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Is that a K series?
Started off as a K series till [url= http://www.engdev.com ]Judd Racing[/url] turned it into a 360bhp+ screaming banshee, basic 25 outer shell built onto a full space frame chassis as it has very short overhangs thus it can turn on a sixpence, is extremely agile, and it weighs next to nothing.
bigdean
As for adjusting for altitude, isn't that the point of the turbo? As the air gets thinner it naturally tries to keep the set manifold pressure.
Unfortunately, it ain't that simple. If you reference the turbochargers wastegate signal to the manifold, then yes, it will, within it's capability, attempt to maintain a constant Manifold Absolute Pressure, which will result in a constant manifold air density at altitude. BUT, to do that the turbocharger has to work a lot harder, because the work done by the compressor is determined by the massflow and the pressure ratio across it. At sea level, to make say 1barG of boost pressure, the pressure ratio would be 2 (2barA / 1barA) but at the top of pikes peak, to make the same 1barA manifold pressure, with an inlet pressure of 0.6barA, that pressure ratio has risen to 3.33!
Of course, the efficiency of the compressor also falls with press ratio, and as a result, post compressor air temperature is going to be a lot higher, and hence you either need more intercooling capability, or more boost pressure (which leads to more heat!) to recover that density and hence engine mass flow.
And then, because the compressor requires more power (it has to spin faster to deliver the same mass flow) the turbine must generate more power, and because that power must come from the exhaust flow, the wastegate must shut further (assuming it isn't already fully shut) and hence pre-turbine EBP climbs. This reduces the effective engine pressure ratio, which results in both a fall in manifold volumetric efficiency (and hence a lower intake mass flow) and also results in a higher exhaust gas residual content at EVC, which leads to a higher end gas temperature at IVC and a corresponding loss of spark efficiency to avoid excessive PkpMax. And obviously, because the effective compression ratio of the engine has fallen, EGT at EVO will rise, which may result in the requirement for extra overfuelling below Stoichiometric to stay within exhaust line thermal limits.
And we haven't even talked about load determination, which on this motorcycle engine with throttle bodies was probably via a basic throttle position sensor (which is terrible for altitude compensation) or intake air temp compensation, or Barometric compensation for both fuel mass, (transiently and statically) and ignition angle. And of course, lets not forget that the ionisation voltage for the spark plug is directly dependant upon the charge density at the Ignition point, requiring Dwell compensation as well.
But of course, i'm sure everyone knew that^^^ anyway 😆
somafunk r
Started off as a K series till Judd Racing turned it into a 360bhp+ screaming banshee
er, i think you'll find it was just 270bhp, was it not? or did they do a turbo version for some other non limited championship?
Max. You are awsum!
+1
It's worth going onto 4od & watching a little series of short ( 6 or 7 mins each ) films with Guy Martin where he describes his passion for racing, mechanicing & his Merlin engine.
It's a custom tuned gravel specific car for the guy who owns royalaero aviation (no expense too much), as far as i was made aware it had 360bhp+, although you maybe know better.
Watched it a couple of hours ago, and I thought it was excellent. Guy is such a character, and so passionate about everything.
I thought the sectioned exhaust added to the look, the way each section coloured in bands looked stunning, and the fact Guy won his class, without a fancy team behind him, and on a Frankenbike he put together pretty much on his own, made his win so much sweeter.
Certainly wouldn't have been the same on a borrowed factory bike; where's the fun in that?
Looking forward to the hovercraft, that is properly nuts!
Top bloke and very entertaining
The old Nokia was brilliant. Makes me want to ditch the Blackberry 🙂
What a legend.
*Dragging oxygen de-concentrators into the house*
"Bloody 'ell, these are heavy."
*afterwards*
"oh, look, they've got little wheels on the bottom..."
Makes me proud to be northern.
somafunk
It's a custom tuned gravel specific car for the guy who owns royalaero aviation (no expense too much), as far as i was made aware it had 360bhp+, although you maybe know better.
I've seen a turbocharged K series in a hill climb car make a genuine 350(ish) bhp. It lasts about 10min between rebuilds!
For N/A K series, the Judd 2.0 (K2000 engine) was the most powerful of what i would call the "genuine" power outputs (rather than pub ammo ones!) and made around 270bhp, which is 130bhp/litre which is a realistic maximum for anything that isn't an F1 engine (and hence doesn't do 20krpm)
I'd wished he had put it on a rolling road to see what bhp it was making.
I helped my mate build the first 'monster' bike in the late 80's, we bored a GSX to 1500, bolted it into a custom built spondon frame and turbo'd it, kicked out 250bhp and he held the world wheelie record @ 150mph on it for most of the 90's.
I rode it once and that was enough for me, it was fekin mental, I shat myself, it would wheelie in every gear when the boost came in!
He then went on to have a head on with another rider whilst doing wheelie demos. They hit each other whilst both doing 100+, virtually paralysed his legs and he was cristenend by his best mates 'wobbly' from that day forth 😀
He tested it 🙂
http://www.guymartinracing.co.uk/turbo-bikes-are-go/#more-1367
" It makes 320bhp and does wheelies off the throttle in top gear. She is proper, just on with getting her painted so I’ll get some better pics up when she’s 100% finished. Oh, and my mate Yim has got me a nitrous system to put on her, so my goal now is 500 bhp. I’l keep you informed. It’ll end it tears I’m sure."
....nurse....!!!!
Wonder who will turn up on the Kawasaki H2R next year.
@maxtorque
How do you fuel for a rarified atmosphere at altitude?
As you climb the oxygen content decreases , so in theory to keep sto the amount of fuel would also decrease. But , is the air not made up of different gasses which are non flamable ?
Saab used barometric sensors in the 80's and they pretty much had turbo'ing sorted by then.
Surely a wet shot nitro system would have been more reliable given the limited time and testing available.
Was the comp ratio lowered for forced induction? or was it pinging away merrily eating the pistons?
No sign of an intercooler or water / methanol injection
I is confused , but thats not hard really. . . .
maxtorque : ahh that's good to know for my geek knowledge bank, next time i see him i'll casually drop it into conversation and see the response 😀
keithd - yep the legend himself. Not seen him for years, he moved up to cumbria and started lecturing.
I used to love the Steve Burns bikes. The 1500 monster was just amazing.
Guy Martin does the world wheelie record on a Steve Burns bike would make some classic telly.
@100MPHPLUS
No better place to move to! he was erm friendly with my mates ex girlfriend for a while. She lives up here but hes not with her (I dont think!?!)
