Fuel damper and Fuel press. regulator question on 16v
09-18-2008, 12:40 PM
#16
Rennlist Member
09-18-2008, 12:43 PM
#17
Rennlist Member
re-read the post! I said the return line is clamped down. I mean, clamp it down using a vice grip until its all the way closed. I put it on a grinder to smooth out the corners . THEN, you stick that part (the return fitting) right back where it was originally attached to. that way, you remove its abiltity to return fuel back to the fuel tank. AND, (key point) if it leaks, (it being the return line in the hose) it leaks back to the fuel tank, NOT on the engine. 
mk
mk
09-18-2008, 03:43 PM
#20
Rennlist Member
Actually, I just thougth about how the darn thing works and came up with it. (after i had bought 2 of them on my first project with Ljet)
The return line is how the pressure is regulated by the regulator for the fuel rails. the more fuel returned, the lower the pressure. the less allowed to return, the greater the fuel pressure. By clamping it off and stuffing it back in the return line hose, you basically eliminate it from the pressure equation. (in fact, it could be a REAL poorman, shade tree way of raising fuel pressure. unfortunately, if you clamp down too far, it would be hard to widen the hole back up. (holes, as you would have to do this to both of them). After one of the regulators is clamped down, all the burden for regulating pressure is on the single regulator, that is now adjustable. since both regulators are in parallel, if one is missing and can handle the force needed to keep a certain fuel pressure range on the rails, it does the job.
we got Scots part euro Ljet 5 liter to run 12.5:1 over the entire rpm range by using this technique of one regulator (RRFR) and clamping off the return line and stuffing it back in the return hose , technique.
mk
The return line is how the pressure is regulated by the regulator for the fuel rails. the more fuel returned, the lower the pressure. the less allowed to return, the greater the fuel pressure. By clamping it off and stuffing it back in the return line hose, you basically eliminate it from the pressure equation. (in fact, it could be a REAL poorman, shade tree way of raising fuel pressure. unfortunately, if you clamp down too far, it would be hard to widen the hole back up. (holes, as you would have to do this to both of them). After one of the regulators is clamped down, all the burden for regulating pressure is on the single regulator, that is now adjustable. since both regulators are in parallel, if one is missing and can handle the force needed to keep a certain fuel pressure range on the rails, it does the job.
we got Scots part euro Ljet 5 liter to run 12.5:1 over the entire rpm range by using this technique of one regulator (RRFR) and clamping off the return line and stuffing it back in the return hose , technique.
mk
