BMW K bikes (Bricks)

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GF Wollongong

GF Wollongong
Platinum member
Platinum member
Was wandering through Motobins online offerings and, in the bottom of service parts section, saw this... (it is available for both K75 and K100

PULSE-JET IGNITION 
( Full Kit For All 3 Cylinders 

Code: 07015K
-Pulse-Jet Ignition is a revolutionary new way of igniting the main cylinder charge, by igniting a small charge in a confined space the pressure and temperature rise very quickly, the emerging explosion from the PJI ports ignites all areas of the main combustion far more efficiently than the heat from a single spark, the differing port volumes of the insert creates an internal low pressure after the initial explosion, drawing in any unburnt fuel and air, as in a Pulse-Jet and fires again and again...around two hundred times per second.---------- • Marked increase in performance and in low rev pick-up • Quicker throttle response • Smoother engine operation • Lower fuel consumption ==== Only spark plug requires changing for service. PJI will not need replacing.
 
K75 | K75C | K75S | 1984 - 1995


[size]
K75RT 1988 1996
Show all...[/size]
Pulse JetIgnition - Spark Plug Modification  Wishlist

Pulse JetIgnition - Spark Plug Modification  Instock In Stock

£142.50
EX VAT

£171.00
INC VAT


ADD TO BASKET

-


https://pulse-jetignition.co.uk/

Anyone used them? My attitude is that they are too expensive to justify (even to myself). Apparently, they were initially developed for (historic?) aircraft racing. 

You want to do a lot of riding to recoup the cost.

GF

    

duck

duck
Life time member
Life time member
Did some Googling on this out of curiosity. Found a few posts on ADV and a few airhead forums.  General consensus seems to be skepticism.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

MartinW

MartinW
Life time member
Life time member
I had an instructor during my apprenticeship pull a heap of fuel saving/performance enhancing devices out of his draw. He listed the devices on the blackboard and the fuel saving % claims lowest to highest. He then used the lowest claims and added them up which totaled over 100 %. His conclusion was that if you added all the devices to your vehicle you would have to stop to drain of the excess fuel.https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=31&cad=rja&uact=8&ved=2ahUKEwiItuTXycXnAhVtxDgGHQhpCP4QFjAeegQIAhAB&url=https%3A%2F%2Fauto.howstuffworks.com%2Ffuel-efficiency%2Ffuel-saving-devices%2F10-fuel-saving-device-hoaxes.htm&usg=AOvVaw2vF9cK419svUQTulD3DZG2
Regards Martin.


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K75s Hybrid
    

TacKler

TacKler
Life time member
Life time member
Could this turn into one of those single versus four port injectors/oil/tyre threads where the experts argue out the finer points of how much of a fraction of a percent improvement your coin will buy?  

Or perhaps the reality is, yes it does work but only in high performance applications such as racing or aircraft engines and largely irrelevant for out motos?  

Just sayin'.  Crying or Very sad


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Red 1991 K75S
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
It's not just spark plugs and injectors.

A few years back the West Marine catalog of boat stuff had a carbon fibre head listed for a mere $9,995.  That summerl the racers at the yacht club where I worked were all talking about how cool it was and how much it could increase their speed around the course by getting rid of some of the 22 pounds a conventional porcelain head weighed. 

What was amusing to those of us who worked on the boats was that the shipping weight in the catalog for the carbon fibre head was the same as for the porcelain model, so the weight saving couldn't have been more than 4-5 pounds.  Five pounds on a 7,000 pound boat for nearly $10K is not a good deal in my book.

https://www.nauticexpo.com/prod/planus/product-34272-243701.html


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Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

indian036

indian036
Life time member
Life time member
@MartinW wrote:I had an instructor during my apprenticeship pull a heap of fuel saving/performance enhancing devices out of his draw. He listed the devices on the blackboard and the fuel saving % claims lowest to highest. He then used the lowest claims and added them up which totaled over 100 %. His conclusion was that if you added all the devices to your vehicle you would have to stop to drain of the excess fuel.https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=31&cad=rja&uact=8&ved=2ahUKEwiItuTXycXnAhVtxDgGHQhpCP4QFjAeegQIAhAB&url=https%3A%2F%2Fauto.howstuffworks.com%2Ffuel-efficiency%2Ffuel-saving-devices%2F10-fuel-saving-device-hoaxes.htm&usg=AOvVaw2vF9cK419svUQTulD3DZG2
Regards Martin.
Nah, all wrong. Some devices would be doing the same thing, so one would be redundant because of the effect of the other. The fuel saving would probably be reduced to 95%, thereby saving the necessity of draining the excess fuel.  Wink Laughing Razz   Gotta keep some fuel circulating in the system!

Bill


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1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

charlie99

charlie99
VIP
VIP
-Pulse-Jet Ignition is a revolutionary new way of igniting the main cylinder charge, by igniting a small charge in a confined space the pressure and temperature rise very quickly, the emerging explosion from the PJI ports ignites all areas of the main combustion far more efficiently than the heat from a single spark, the differing port volumes of the insert creates an internal low pressure after the initial explosion, drawing in any unburnt fuel and air, as in a Pulse-Jet and fires again and again...around two hundred times per second.---------- • Marked increase in performance and in low rev pick-up • Quicker throttle response • Smoother engine operation • Lower fuel consumption ==== Only spark plug requires changing for service. PJI will not need replacing.




multiple firing has been around in ecus for quite a while now , in many cases it isn't talked about because o the technology used in some cheaper aftermarket addon jobs



but once you get to the near pro - racing and even just high performance in modern cars these days ...its all standard equipment

with feedback  from the obd port about which cylinder is having issues ...and why


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OPulse JetIgnition - Spark Plug Modification  Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

BobT

BobT
Life time member
Life time member
The energy that your engine produces to turn the back wheel is in the fuel. A spark just ignites that fuel.
If there is no neat fuel coming out of the exhaust then you can guess that most of it is being burnt.

Put some fuel in a dish and throw a match into it, it goes bang. Do the same but throw 6 matches at once into it, it still goes bang in the same way.

    

charlie99

charlie99
VIP
VIP
betya you cant do that 200 times a second ....... and at compression pressures



Pulse JetIgnition - Spark Plug Modification  214585Pulse JetIgnition - Spark Plug Modification  44271


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OPulse JetIgnition - Spark Plug Modification  Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

GF Wollongong

GF Wollongong
Platinum member
Platinum member
One of the more sobering statements regarding high tech refinement I heard was:

"The cheapest way is for the (bicycle) rider to loose some weight."

Just as well we have 750cc and more available.

Laughable that a carbon fibre head / toilet should weight almost the same as the procelain one. Says a lot that it should be popular. Can't image that the rich boat owners were in a lean physical state.

Pathetic really.

I spent a few weeks crewing (as ballast!) on a yacht in the twilight races on Sydney Harbour. Deadly serious stuff. The owners of the boat wouldn't take it outside the heads because they would get seasick. Nothing 3 days at sea wont cure.

GF

    

Dai

Dai
Life time member
Life time member
@GF Wollongong wrote:You want to do a lot of riding to recoup the cost.
Or have a lathe and a bit of free time...

-Dai


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1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

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