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Post by StewRoss on Oct 23, 2008 15:44:53 GMT -5
No a little different in the way it shows up; detonation will also destroy an engine as you say...also wrecks the sides of the crown etc. as well. Neither is good. SR  |
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Post by phoebeisis on Oct 23, 2008 15:51:02 GMT -5
In one of my SR500's detonation sounded like shaking a can with gravel in it-not good. It is most common in high load low RPM situations- like climbing a hill in a tall gear with full throttle- maybe 3500-4500 RPMs.The cylinder fills very well at those RPMs-the torque peak. I read somewhere if the RPMs are high enough-Formula I car RPMs- you don't have to worry about detonation because the burn/swirl is so fast,and there is so little time for detonation to start.I don't run 15000 RPMs, so... it is still a worry with any SR500.
Charlie
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Post by crash and burn on Oct 23, 2008 17:02:13 GMT -5
High RPM motors still have issues with detonation symptoms tend to be different tho but it still does similar damage
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Post by caferacercarl on Oct 26, 2008 3:32:35 GMT -5
That magic window of air/fuel, only properly measurable under load, rich does run cooler but makes the rings slippery and not seal, and lean is heat, between 12 and 13 to 1, modern engines run lean but it has more to do with the arc of rod ratio at TDC and spark map and proper atomisation [re ,direct injection] over just air or water cooling, but I should stop here.....its going beyond SR technology and thats forbidden here.
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Post by StewRoss on Oct 26, 2008 4:36:10 GMT -5
Well it looks like the SR400 goes to FI next year anyway...so 'mapping' might become topical? ...and 'lap tops'... SR  |
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Post by davedunsboro on Oct 26, 2008 5:45:19 GMT -5
I wonder how long it will be before I can get one of those systems second hand to have a play with? It may be a bit of fun retroing it to a 500 ,but I'm sure it wont come cheap so I better start saving! Cheers Dave.
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Post by wotavidone on Oct 26, 2008 18:51:56 GMT -5
It will be good, won't it? Especially if it is a closed loop system with knock sensing as well.
Imagine having the computer making thousands of adjustments to ignition timing every minute, running the advance right on the edge of detonation at all times, with an oxygen sensor making sure the mixture is perfect at all times. I reckon even a bog stock engine would make an instant gain in horsepower.
Can't wait.
Mick
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Post by colinjay on Oct 27, 2008 3:44:47 GMT -5
Yeh, but were will the fun be working on your bike. Having everything electronically controlled by a computer! Not much fun in that! You might as well buy buy a Playstation and go down the modern kids idea of a good time.
Also All this computer controlled EFI and engine managment stuff has seen the death of real mechanics who can actually tell what an engine is doing with out having to plug in another computer to find out what the onboard computer is (or isn't) doing!
Ludites of the world unite! Before its to late.
CJ
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Post by davedunsboro on Oct 27, 2008 6:43:00 GMT -5
I wondered when the new "Goblin " would pipe up ! Col the fun for me would be getting it to work & all the playing & test riding .Besides I'll only do one for the hell of doing it? Col you cant tell me you wouldn't be slightly interested in having a go if a system came your way? BTW whats a f**king Ludite?Cheers Dave.
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Post by andy on Oct 27, 2008 13:20:42 GMT -5
100% correct Col !!!.
Andy.
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Post by wotavidone on Oct 27, 2008 16:45:35 GMT -5
Colin,
The challenge and the fun will still be there. My mechanic mate did the Ford EFI course years ago, and he used to bring the books around to my house for help with the math and the concepts. We had a ball, learned heaps and he's made a full on buisiness out of it.e's about the same age as you, and the customers are deserting the dealers and flocking to his little backstreet shop in droves.
Some of his success stories
- fuel injected high output 5.0 litre mustang engine into 1956 Customline, with 4 speed auto, highway lean burn mode, the lot. A real sleeper that gives lots of modern cars a shock.
- 5 litres mustang engine in early F100, Mick did the lectronics for it. The F100 belonged to Colin Will owner/builder of the Willpower funnycar.
-Not to mention injected RB30 nissan into an old FC holden ute.
You genuinely wouldn't want to be the guy who fitted it and wired it, and made it go like shite off a shiny shovel?
Mick
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Post by marlon on Oct 27, 2008 18:10:26 GMT -5
EFI gives me wood.
The sooner I can get a bolt on carb replacement I'm there. Imagine all the downloadable maps for the bike. Bloody whammo!
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Post by crash and burn on Oct 28, 2008 0:40:57 GMT -5
WOWWWWWW! TMI! EFI is nice but there's no need to get that excited about it. But retro fit EFI on an SR? why? I know the advantages of EFI I use to build tuner cars and hot rods. I just don't see any good reason to do it on a SR.
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Post by colinjay on Oct 28, 2008 1:49:10 GMT -5
Dave,
The original Luddites were members of a movement that opposed the introduction of automated weaving loam into the textile industry in Great Brittan in the early 1800's. Often so violently that the army was called in to suppress them, and a few were transported to good old sunny Australia, which would have made them very happy as there was not much in the way of modern technology out here then. Since then, the term "Luddite" has been generalised to describe anyone opposed to technological change/development.
I would have to say, that all SR500 owners are to some degree Luddites. We all enjoy the simplicity of the design of the SR and generally don't want the latest wizz bang all-singing-all-dancing latest techno rocket propelled sports bike with multi-ajustable widgits!
To everyone else, YES, if someone dropped the fuel injection, ignition and engine management system from a late model 999 Ducati into my lap, I would not hesitate in trying to set it up on the new engine that I am building up for my salt racer. But as I know there are no fairy god mother's out there, and I still can't pick the right numbers for Lotto, I will stick to developing it as a carburated engine.
CJ
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Post by davedunsboro on Oct 28, 2008 2:32:16 GMT -5
The new goblin speaks!Thanks for explaining that Col , I am now a little more knowledgeable than I was when I woke this morn! I agree ,the EFI module would have to be a bargain for me to bother too(just the 999 back box is well over a grand for a start)& I wouldn't mind betting if you could find one it wouldn't have the chip.So it will probably be 30 years from now anyway ?Cheers Dave.
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