Whats up with Cut Delivery Valves?
Whats up with Cut Delivery Valves?
What have you guys noticed? More power/ smoke? Higher EGT's? What exactly does cutting the DV's entail?I have just completed my engine swap in my 81 300SD. It now houses a 1984 model year 617.952. The alda has never been touched (evidence of this being the metal band around plastic cap over adj nut). I want to remove it soon because it isn't near as peppy as my former benz engine (stock with ALDA devirginized 1981 617.951). I need to check my boost on this .952 and report back. Basically, I am looking for good performance while trying not to sacrifice too much mileage-I know people in Hell want icewater .
The DV isn't a restriction to flow on the M and MW pump. Cutting the collar results in a very unstable idle, lots of smoke and extremely quick increasing EGTs. It had good power but the EGTs made the power unusable.
http://www.youtube.com/watch?v=HUUxhb4Rd9w
(11-30-2009, 01:15 AM)ForcedInduction The DV isn't a restriction to flow on the M and MW pump. Cutting the collar results in a very unstable idle, lots of smoke and extremely quick increasing EGTs. It had good power but the EGTs made the power unusable.
http://www.youtube.com/watch?v=HUUxhb4Rd9w
(11-30-2009, 01:15 AM)ForcedInduction The DV isn't a restriction to flow on the M and MW pump. Cutting the collar results in a very unstable idle, lots of smoke and extremely quick increasing EGTs. It had good power but the EGTs made the power unusable.
http://www.youtube.com/watch?v=HUUxhb4Rd9w
(11-30-2009, 01:33 AM)ForcedInduction No, just the collar profile.
(11-30-2009, 01:33 AM)ForcedInduction No, just the collar profile.
Yes, Just cutting the collar. The height difference is an optical illusion of the camera.
Yes. Remove the lines, remove the 15mm nuts and they will be directly under. They will need a new copper crush washer as well.
Yes, I did them myself using a crude air drill/lathe and a dremel.
What about cutting a "channel" in the collar? Would that in theory allow more fuel, but not as much as totally cutting them? Maybe better idle results?
The DVs from the P7100 shown above show that on the brass looking one, the collar is still there but just "thinner". This would allow more fuel and still have a collar to reduced the risk of double injection.
Thats what I could come up with the collar does from reading other threads.
I take it from your user name, that is from a 606?
I couldn't tell ya. I feel that a Cummins forum might be helpful right now.
I'd be looking into a set of Tomnik's "Holly" 6.5mm elements and a VNT for the most bang for the buck.
I'm getting some 7.5's from him and it would probably be a good time to get some other things right now to save on shipping. I could send them to you once I got them here in the States.
Ian, I'm afraid I haven't had time to put them in yet...
(12-02-2009, 08:03 AM)E300TSC Ian, I'm afraid I haven't had time to put them in yet...
Indeed, larger diameter elements are the way to go for more fuel with proper delivery, as well as being very cost effective (for more power).
(12-02-2009, 08:03 AM)E300TSC Ian, I'm afraid I haven't had time to put them in yet...
(12-02-2009, 06:45 PM)DervTuning Indeed, larger diameter elements are the way to go for more fuel with proper delivery, as well as being very cost effective (for more power).
(12-02-2009, 08:03 AM)E300TSC Ian, I'm afraid I haven't had time to put them in yet...
Don't worry, we will soon change that for you
(12-02-2009, 06:45 PM)DervTuning Indeed, larger diameter elements are the way to go for more fuel with proper delivery, as well as being very cost effective (for more power).
(12-02-2009, 08:03 AM)E300TSC Ian, I'm afraid I haven't had time to put them in yet...
Don't worry, we will soon change that for you
(11-30-2009, 01:15 AM)ForcedInduction It had good power but the EGTs made the power unusable.
(11-30-2009, 01:15 AM)ForcedInduction It had good power but the EGTs made the power unusable.
(12-07-2009, 09:06 PM)ForcedInduction That was with the VNT.
(12-07-2009, 09:06 PM)ForcedInduction That was with the VNT.
(12-08-2009, 02:51 PM)ForcedInduction It was thick gray, not black.
(12-08-2009, 02:51 PM)ForcedInduction It was thick gray, not black.
(12-28-2009, 10:44 AM)ForcedInduction For about 500rpm with it spools up at 4000rpm!
(12-28-2009, 10:44 AM)ForcedInduction For about 500rpm with it spools up at 4000rpm!