Charles
Well-known member
- Joined
- May 18, 2011
- Messages
- 2,729
- Reaction score
- 47
So....
A long time ago...... in a galaxy far, far away..... I recall testing proceeding along toward ever lower and lower hydraulic ratios for Heui injectors in an effort to stave off the #1 obstacle to Heui power..... oil per unit time. At the time, the fastest injectors were those with the lowest hydraulic ratio possible with available internal component combinations.... aka, hybrids at a ~5:1 ratio. Dave at Swamps specifically pushed hard enough to produce some one-off P&B's much larger than 7mm that while knowingly lacking the materials and manufacturing processes necessary for actual service in an engine, were sufficient for proof of concept and some dumb fast injection rates were achieved. In reality..... if a person could lock in a vendor to produce such a small batch of P&B's and be willing to pay through the teeth, that path could be taken. But at the time CR seemed the obvious choice, or just put a pump on the engine because price-wise, it was just dumb expensive and therefore dropped.
Fast-forward... to present day....
Surprisingly, people are still playing with the 7.3, the old girl just keeps hanging in there. So.... For anyone interested.... since I clearly will not be having any talks with anyone at Swamps going forward, I have a lingering concept never fleshed out that could prove very cost-effective at reducing hydraulic ratio in a way that should be very reliable and require no special machining.
Reduce the intensifier piston surface area instead.
Yes, the spring is in the way but I honestly think you can just remove it. Then machine up an intensifier of whatever diameter floats your boat ( I have some thoughts on that too) but simplistically, just say something to land on a 4:1 or a 3:1 ratio. Then machine bushings to press into the bodies bringing the intensifier piston bore inline with the new sizing with an O-ring groove.
To account for the missing return spring, just take the delivery pump pressure of 50 or whatever, and run it into something similar to a Gen3 pump, possibly even in the Gen3 style mount and offset the fuel pressure only in the heads themselves up to 400, 600, 1000 or whatever maintains a return amount (and subsequent available stroke) desired.
In this way you could remove the spring entirely, freeing up the way for a very easily machinable intensifier piston and sleeve and also allow for a dynamic injector total capacity based on the delivery fuel pressure you send to the heads. Similar in part to the concept of the PT injection system.
Anyway. I seem to find myself back in the 7.3 game and without anyone to collaborate with, so internet, shoot that down, else I'd be interested to see what a system like that would do up top on a 7.3.
Also... the increased ICP can be managed with altered poppet valve geometry where it is exposed to the ICP in order to balance the static force needed to keep the poppets from floating at 4000 or 5000+ ICP without shimming the poppet spring, delaying open time, necessitating dual IDM's again and all that, yada, yada, yada.
With the lower hydraulic ratios and super large nozzles you could run proportionately higher ICP without blowing the fuel plates to piss because the achieved injection pressure would probably still fall somewhere close to that of a stock AD at full song.... just while pushing fuel through a nozzle 5 or more times larger....
Thoughts?
A long time ago...... in a galaxy far, far away..... I recall testing proceeding along toward ever lower and lower hydraulic ratios for Heui injectors in an effort to stave off the #1 obstacle to Heui power..... oil per unit time. At the time, the fastest injectors were those with the lowest hydraulic ratio possible with available internal component combinations.... aka, hybrids at a ~5:1 ratio. Dave at Swamps specifically pushed hard enough to produce some one-off P&B's much larger than 7mm that while knowingly lacking the materials and manufacturing processes necessary for actual service in an engine, were sufficient for proof of concept and some dumb fast injection rates were achieved. In reality..... if a person could lock in a vendor to produce such a small batch of P&B's and be willing to pay through the teeth, that path could be taken. But at the time CR seemed the obvious choice, or just put a pump on the engine because price-wise, it was just dumb expensive and therefore dropped.
Fast-forward... to present day....
Surprisingly, people are still playing with the 7.3, the old girl just keeps hanging in there. So.... For anyone interested.... since I clearly will not be having any talks with anyone at Swamps going forward, I have a lingering concept never fleshed out that could prove very cost-effective at reducing hydraulic ratio in a way that should be very reliable and require no special machining.
Reduce the intensifier piston surface area instead.
Yes, the spring is in the way but I honestly think you can just remove it. Then machine up an intensifier of whatever diameter floats your boat ( I have some thoughts on that too) but simplistically, just say something to land on a 4:1 or a 3:1 ratio. Then machine bushings to press into the bodies bringing the intensifier piston bore inline with the new sizing with an O-ring groove.
To account for the missing return spring, just take the delivery pump pressure of 50 or whatever, and run it into something similar to a Gen3 pump, possibly even in the Gen3 style mount and offset the fuel pressure only in the heads themselves up to 400, 600, 1000 or whatever maintains a return amount (and subsequent available stroke) desired.
In this way you could remove the spring entirely, freeing up the way for a very easily machinable intensifier piston and sleeve and also allow for a dynamic injector total capacity based on the delivery fuel pressure you send to the heads. Similar in part to the concept of the PT injection system.
Anyway. I seem to find myself back in the 7.3 game and without anyone to collaborate with, so internet, shoot that down, else I'd be interested to see what a system like that would do up top on a 7.3.
Also... the increased ICP can be managed with altered poppet valve geometry where it is exposed to the ICP in order to balance the static force needed to keep the poppets from floating at 4000 or 5000+ ICP without shimming the poppet spring, delaying open time, necessitating dual IDM's again and all that, yada, yada, yada.
With the lower hydraulic ratios and super large nozzles you could run proportionately higher ICP without blowing the fuel plates to piss because the achieved injection pressure would probably still fall somewhere close to that of a stock AD at full song.... just while pushing fuel through a nozzle 5 or more times larger....
Thoughts?
