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Managed to tweak the check valve to the point where vacuum doesn't suck w/m into the engine anymore. Did a 500km round trip to the snow on Tuesday and only used one liter of mix for the whole trip. Almost 500kms on one tank of gas wasn't too bad either!
Also:
Was listening to one of Rob Dahms videos last night and realised the effect of cooling and providing fuel down the APV runners may be a ton more beneficial than I realised. There is definitely the potential for hot spots within the combustion chamber caused by fuel-less APV air.
I highly doubt that any part of air volume stays unmixed with other parts of it .. by the time its time to combust, the air/fuel mixture is very homogenous. The air is VERY turbulent in the combustion chamber especially while on boost.
I highly doubt that any part of air volume stays unmixed with other parts of it .. by the time its time to combust, the air/fuel mixture is very homogenous. The air is VERY turbulent in the combustion chamber especially while on boost.
Surely it's always better to get the mix as homogenous as possible before compression - isn't that a basic fundamental of engine design? It's why Mazda have injectors on ports on either side of the rotor! Do any piston engines you know of, not put fuel through every intake valve? Apart from DI of course.
all those "swirl" generators ect are for low load and restricted airflow. When its under 70-80% load or higher, the speeds dooring compression are very very high (thus mixing as well).. in some engines approaching 100m/s (ant there it is only vertical compression, not moving of the whole volume like on a wankel). Its impossible to have non homogenous mixture. Many high perf 4Cyl 16V engines have intake manifold runners at different angles to head ports and injectors are usually biased.
I suppose you saw some "combustion" marks and how they are washed in some area and in some they are clean. This has nothing to do with how good and equal the combustion is, it is a consequence of washing from intake stroke.
see ere a two smoke piston..and that is called "wash pattern".
there’s a reason Mazda doesn’t put fuel in the APV
1. the barrel isn’t on/off like the SSV and it’s long even from the manifold face to the port opening.
2. where does the remaining fuel go when the barrel is closed
there’s a similar potential issue with water injection ahead of the manifold split to the APVs, which is why I wouldn’t do it that way
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I hear ya ..... where I have it, it goes to the other ports when the APV closes.
And ...it's not like I'm pouring fuel/water down there either ...... it's half of the total w/m requirement (so less than 5% of the total fuel requirement) . Even then not all of the flow from that nozzle will go into the APVs .
May as well just pour in fuel through the garden hose then ...lol
Well .. at high loads you might as well (if you're on nitromethane)..
As for normal engines.. its an argument in bad faith..
A hose doesn't atomise the fuel.. and will thus not mix the fuel with air.. but even if we say ½ of air gets all the fuel and the other ½ is dry. The ½ with the fuel has atomised fuel in double concentration but its still same atomisation as it would be if the fuel was split equally between air..
And Its exactly the same as when the the injector is flowing for ⅒ of the time that the port is open.. there all the fuel is delivered in ⅒ of the air, and all the rest of the air is "dry" untill mixed in combustion chamber.
Also with DI engines which have much more complete burn than any port injected especially at low load, where the fuel has much less time to mix.. and is delivered in few very small volume parts and the mixing is again due to the turbulence in the combustion chamber..
Onl 5% of fuel is your WI target ? That is very low amount.. based on the ones with high success system they are up to 30%
As for normal engines.. its an argument in bad faith..
Not at all ..... to make a point I was pointing to the ridiculous ..... which often helps some people understand how small details can matter.
A hose doesn't atomise the fuel.. and will thus not mix the fuel with air.. but even if we say ½ of air gets all the fuel and the other ½ is dry. The ½ with the fuel has atomised fuel in double concentration but its still same atomisation as it would be if the fuel was split equally between air..
And Its exactly the same as when the the injector is flowing for ⅒ of the time that the port is open.. there all the fuel is delivered in ⅒ of the air, and all the rest of the air is "dry" untill mixed in combustion chamber.
Also with DI engines which have much more complete burn than any port injected especially at low load, where the fuel has much less time to mix.. and is delivered in few very small volume parts and the mixing is again due to the turbulence in the combustion chamber.
To me it makes sense to do what you can to get it done before compression ..... Mazda thought so too when they switched to four injectors on the S2 and made sure each side got fuel.
Only 5% of fuel is your WI target ? That is very low amount.. based on the ones with high success system they are up to 30%
No . Aiming for total water/meth between 13-25% depending on rpm etc . But that's both nozzles (and only one is over the APV runner entrance). And as I mentioned before it's likely that not all from that nozzle goes to the APVs. So approx. 5% of the fluid (as water/methanol) is going to APV ports at least and approx.12% at most.
But you do realise that even if all ports are getting perfect ratio fuel to air, it is still not all the time that the fuel is flowing. So the mixture going in to the engine still wont have a uniform mixture.. as depending on DC of FI they will be only for a percentage of the time/volume of air.
But you do realise that even if all ports are getting perfect ratio fuel to air, it is still not all the time that the fuel is flowing. So the mixture going in to the engine still wont have a uniform mixture.. as depending on DC of FI they will be only for a percentage of the time/volume of air.
Sure I take your point ... but still, some effort is made to get it to either side and spread it out as much as is practical to do so.
08-19-2024, 06:16 AM
