BlackJota
Senior member
- Location
- Sunshine Coast Australia
This guy takes a mower engine "sand / dirt ingress" demonstration to the next level. Not at all surprised at the result if you get enough in.
Last edited:
Unfiltered Intake Air.
- Thread starter BlackJota
- Start date
78jotadave
Hero member
Tuning for speed, is there any performance advantage to running correct length velocity stacks, top speeds?
Dellortoman
Hero member
- Location
- Tasmania, Australia
That bloke should be charged with cruelty to an engine
GregT
Hero member
- Location
- Christchurch NZ
It's a Briggs & Stratton - or a clone.That bloke should be charged with cruelty to an engine
A/ I've suffered enough from those things he can do what he likes to it.
B/ They barely meet the definition of an engine.
The new place has a pocket handkerchief lawn - and I've been given an electric mower which runs.
It doesn't appear to have any air filtration but does have a cooling fan.
Tippie
Hero member
- Location
- Dr?bak, Norway
I second the motion.
Exmoor beast
Hero member
- Location
- Minehead,Somerset, ENGLAND OF COURSE
Had a Montjuïc that ate a 6mm nylon nut- not pretty, wouldn’t have happened with filters.
I have found various rags blue paper etc that have been dragged into motors, rain can play merry fuck with throttle slides but I have only ever seen carburettor fires ( Montjuïc did that as well …) on open carbs.
I would always run filters or very least tea strainers.
I have found various rags blue paper etc that have been dragged into motors, rain can play merry fuck with throttle slides but I have only ever seen carburettor fires ( Montjuïc did that as well …) on open carbs.
I would always run filters or very least tea strainers.
Yes.
The shape of the velocity stack is important for maximising laminar flow into the carburettor. I believe Red posted a link to an article about this but that was years ago.
The length of the inlet tract can be used to create a resonance effect to maximise intake at particular rpm. Find a copy of 'Tuning For Speed' by Phil Irving, explains it all.
cheers,
bazzee
correct, I did post up some info on low pressure flow and velocity stack shapes a few years ago but I was vilified by a particular over opinionated individual at that point so since then I have reduced my input to this forum to a bare minimum
I do still try and moderate the forum where I see conflict or just delete inane comments on occasion as I am still the only southern administrator but rarely post up anything of value these days
The Sock
Hero member
- Location
- London, England
I have always run a filter on my Laverda, but that is not a complete guarantee against foreign object ingestion.
Some years back, riding with my mate, Steve, we crossed an area of road where the top surface of tarmac had been removed. At the end there was a two inch step onto the old surface. As I accelerated over the ridge, the engine started popping and banging and, mainly, running on two cylinders.
Fortunately, it happened not too far from home. Once back, I checked the exhausts to find the coolest one, pulled the plug and was pleased to have Steve as a witness, because I would have struggled to believe this, if told by someone else:
There was a bee trapped between the electrodes of the spark plug.
My best guess is that it had crawled into the filter box at some point earlier, during maintenance, while I had the rubbers off. Died and dehydrated, when I gave a handful of throttle, and hit the bump, it had popped up and been sucked into the engine.
How the heck it managed to miss all the things that might've smashed it to smithereens is anyone's guess but it did and lodged between the electrodes.
I took a Polaroid, which went missing for a number of years, found last week while looking for something else. It's not studio quality, but you're seeing what I saw when I pulled the plug out.
Some years back, riding with my mate, Steve, we crossed an area of road where the top surface of tarmac had been removed. At the end there was a two inch step onto the old surface. As I accelerated over the ridge, the engine started popping and banging and, mainly, running on two cylinders.
Fortunately, it happened not too far from home. Once back, I checked the exhausts to find the coolest one, pulled the plug and was pleased to have Steve as a witness, because I would have struggled to believe this, if told by someone else:
There was a bee trapped between the electrodes of the spark plug.
My best guess is that it had crawled into the filter box at some point earlier, during maintenance, while I had the rubbers off. Died and dehydrated, when I gave a handful of throttle, and hit the bump, it had popped up and been sucked into the engine.
How the heck it managed to miss all the things that might've smashed it to smithereens is anyone's guess but it did and lodged between the electrodes.
I took a Polaroid, which went missing for a number of years, found last week while looking for something else. It's not studio quality, but you're seeing what I saw when I pulled the plug out.
So the forum suffers a lack of knowledge & tech data due to one asshole?
The Sock
Hero member
- Location
- London, England
Exmoor beast
Hero member
- Location
- Minehead,Somerset, ENGLAND OF COURSE
BEE 8ES
The Sock
Hero member
- Location
- London, England
PMSL!
Tippie
Hero member
- Location
- Dr?bak, Norway
The length of the "velocity stack", and also the overall length from the valve to the slide and to the entry to the velocity stack. It is the most annoying thing about the standard SF frame, heavily restricted for lengthening. Getting off track from filters though.
piranha-bro2
Hero member
- Location
- Melbourne
Touché!!! Full marks for wit on that one! That is an incredible tale.
Reminds me of the mouse that found its way into our fan forced electric oven and couldn't find its way out before we used it - it had probably begin to decompose by then, as we weren't often using it - the stench once hot wasn't pleasant!!
Another classic was a cricket that found its way into the vent between top and bottom chambers on our Bialetti screw-up coffee pot. Camping out, morning coffee - rather odd taste!! But a bee in the donk? Classic.
Dellortoman
Hero member
- Location
- Tasmania, Australia
Similar to Quentin's story, I've had a mouse crawl into the back of the stove and electrocute itself across a couple of spade connectors at the back of one of the control knobs. It wasn't in the actual hot part, but the stink of decomposing mouse eventually made its presence known.
Also had a huntsman spider in the back of the washing machine that did a similar thing, except it tripped a circuit breaker. Took a while to identify the faulty appliance then discover the electrocuted spider.
Also had a huntsman spider in the back of the washing machine that did a similar thing, except it tripped a circuit breaker. Took a while to identify the faulty appliance then discover the electrocuted spider.
piranha-bro2
Hero member
- Location
- Melbourne
Huntster turned Redback?
GregT
Hero member
- Location
- Christchurch NZ
Well, if we're into animals now....
Family doc when i was a kid always had Brit sports cars - he had "overseas funds". Took his E type to a medical comference in Dunedin. Hit a sheep at high speed somewhere south of Timaru. Nicely cooked apparently by Dunedin.
Took it in to the local jag agents who steam cleaned the residue out, repaired the damage and touched up the paint in time for the return trip.
I would not have liked the cleanup job, one assumes it was an apprentice....
Never got a ride in the E type - but did in his Austin Healey 3000.
Family doc when i was a kid always had Brit sports cars - he had "overseas funds". Took his E type to a medical comference in Dunedin. Hit a sheep at high speed somewhere south of Timaru. Nicely cooked apparently by Dunedin.
Took it in to the local jag agents who steam cleaned the residue out, repaired the damage and touched up the paint in time for the return trip.
I would not have liked the cleanup job, one assumes it was an apprentice....
Never got a ride in the E type - but did in his Austin Healey 3000.
Legs
Hero member
- Location
- Adelaide Hills
Was about to go for a ride but decided to check things out beforehand, on removing the tank I found that mice or rats decided to store sheep nuggets neatly between the cooling fins on the cylinder head.
Glad I checked, don't know what damage would have resulted if I hadn't.
Glad I checked, don't know what damage would have resulted if I hadn't.
chrisk
Hero member
- Location
- Brisbane, Australia
I reckon there’s a food outlet that’d be interested in those freshly cooked lamb nuggets, if you train the rodents to shop at the chook shed, you could sell fresh chicken nuggets to Red Rooster.