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RE: 2021 Ram 3500 H.O.

The cam in the pump is not like the cam in an engine. The cam in the CP3 is more like the crankshaft in the engine. Increase the crank stroke on an engine and what does it do to its compression ratio and cylinder pressure? Consider this: When the engine is running at 2500 rpm the CP4 pump is capable of pumping a certain volume of fuel. I don't know what that volume is but say it is 2 litres per minute. The CP 3 might be capable of pumping 2.5 litres per minute. Under part engine loads these pumps need to be throttled back. The injectors might only be injecting .5 litres per minute. There is a mechanism in place for controlling the pressure to what the ECM is calling for and limiting the volume of fuel being pumped. I believe the pump is throttled back by only allowing the required fuel to flow into the pump. Push the accelerator down and the fuel control actuator allows more fuel into the pump to match the fuel being injected into the engine. This is controlled electronically but exactly how I don't know. The thing is, if more pressure is being asked for by the ECM the pump needs to respond by pushing more volume into the rail. I think the change in the cam is likely more to do with providing higher volume for aftermarket HP increases... but I really don't know much about this stuff. That is not exactly how it works.... If you go to the link you posted, they even state. 10mm Stroker Shaft To help increase rail pressure when fueling to higher rpms we have designed these pumps with our industry leading 10mm stroker shaft. This also increases flow along with more pressure.
ShinerBock 12/22/20 01:36pm Tow Vehicles
RE: 2021 Ram 3500 H.O.

The cam in the pump is not like the cam in an engine. The cam in the CP3 is more like the crankshaft in the engine. Increase the crank stroke on an engine and what does it do to its compression ratio and cylinder pressure?
ShinerBock 12/22/20 10:24am Tow Vehicles
RE: New Truck Buyer Needs Help

I believe all of the half ton truck makes offer a truck that can tow that under $37k. It may not be a 4wd with all the bells and whistles though. OP, look at the window sticker or "monroney" label as they call it. Look for things like tow package or trailer tow package and make sure it has the proper axle rating, wiring, and receiver hitch for towing. If it has a N/A(naturally aspirated) V8 or a turbocharged 6 cylinder, then it will be able to tow what you have. I would not recommend a N/A V6 or turbocharged 4 cylinder for your trailer. The more gearing the transmissions has, the less relevant the rear axle ratio. Turbocharged engines can also get away with taller gear ratios(lower number) than N/A. For example, the 3.55 on my old turbocharged 3.5L Ecoboost work truck pulled the same loads better and had a higher tow rating than the N/A 5.0L V8 with a 3.73 I had before. In my opinion, I would not go lower than a 3.55 on a turbocharged gaser and no lower than a 3.73 on a V8 within that price range.
ShinerBock 12/22/20 09:59am Tow Vehicles
RE: 2021 Ram 3500 H.O.

Conversion kit for Cummins I can’t imagine the labour being much on a Cummins. Apparently it doesn’t require tuning which makes me think this CP3 is modified to put out more pressure than the CP3 previously used on the Cummins. It doesn't require tuning because it is not a stock CP3. It has a 10mm "strocker" camshaft which increases pressure over a stock CP3. Something must be different. I don't know much about these fuel systems so I might be totally out to lunch but I thought even in stock form the CP3 puts out more volume than the CP4? Regardless, I thought it was the fuel control actuator (FCA) that let more fuel into the pump when the ECM called for more pressure. My understanding is that the CP3 did not have a pressure sensor capable of measuring 29000 psi. When ECM calls for higher rail pressure the FCA lets more fuel into the top of the pump, increasing the fuel delivery and pressure. The problem would occur when the sensor reaches it measuring limit. At that point the pressure continues to rise but because it's not measured the ECM keeps calling for more. It doesn't really matter how it works .... I hope Bosch is supplying Cummins with a CP3.... it would be even better if the Duramax and Powerstroke could get something as reliable. A CP3 conversion is available for the Duramax but not the Powerstroke ... too bad for us Ford guys.:( Volume and pressure are two different things. Just as with our previous discussion on turbos, volume is the max 82 lbs per minute that my turbo can flow while the max 40 psi is the pressure. A smaller turbo can match the same pressure, but it will not have the same flow at that PSI. The smaller stroke camshaft on the stock CP3 did not allow for more than 26k psi. However, the "stoker" camshaft on the one in the link is able to increase pressure past that. The reason why the CP3 has more volume is due to have a greater displacement with 3 pistons rather than 2 on the CP4. Basically how it works on a diesel is that you have a HPFP feeding a common rail that is shared by all or half(one rail for each side) on V configurations. That pump sucks in fuel and pressurizes it in the rail. The injectors then open and close accordingly and the more pressure you have the more fuel can be injected within this window(or multiple windows with todays multi-fire injectors). This is where having more pressure is beneficial to power and efficiency while meeting emissions. However, there will be point or horsepower level where the pump cannot flow or pump more fuel and it begins to starve the rail or rails. This is where volume comes into play. A 3 piston CP3 may be able easily flow enough fuel for 700 hp while the 2 piston(technically not a piston) CP4 may only flow enough fuel for 550 hp. You can make a lot of power with lower pressure mechanical pumps, but you will be dumping a lot of fuel all at once which will increase NOx and roll a lot of coal until you add enough air to burn it completely. Hence the reason why more pressure is needed to meet emissions and increase power. Things would be a lot different if we did not have to meet such stringent NOx requirements. With todays multi-fire injector and higher pressures you can add a lot more power before the engine starts to roll coal even without a DPF. Imagine dumping a bunch of fuel at one shot a 3k psi versus dumping multiple finer mists of fuel at higher pressures around 26k psi. There will be a power limit to where the engine will start to roll coal on both engines because it will not have enough air to completely burn the fuel, however, that power limit will be much higher on the higher pressure multi-fire injected engine.
ShinerBock 12/22/20 09:26am Tow Vehicles
RE: 2021 Ram 3500 H.O.

Conversion kit for Cummins I can’t imagine the labour being much on a Cummins. Apparently it doesn’t require tuning which makes me think this CP3 is modified to put out more pressure than the CP3 previously used on the Cummins. It doesn't require tuning because it is not a stock CP3. It has a 10mm "strocker" camshaft which increases pressure over a stock CP3.
ShinerBock 12/22/20 06:22am Tow Vehicles
RE: 2021 Ram 3500 H.O.

Although I will say that with the power output of the 2500 or standard output Cummins, a CP3 would still be doable while meeting emissions. I don't think the same can be said with the HO power ratings. Maybe the CP4 is only on the HO and the CP3 on the standard output. Just a theory if that truly is a CP3.
ShinerBock 12/21/20 01:43pm Tow Vehicles
RE: 2021 Ram 3500 H.O.

So it’s official the 21’s will have a CP3. I would not say that because people purposely post false stuff on the internet all the time. I know a few instances where it was click bait and if you clicked on the pics then it would send you to a certain page where they are selling something. I would have to look at the part number on the ESN or go down to the dealer and see it for myself before I would say for sure, but that is just me. I would trust you enough if it were your picture or most of the regulars here, but not someone I don't know from another forum.
ShinerBock 12/21/20 01:30pm Tow Vehicles
RE: 2021 Ram 3500 H.O.

Better? https://i.imgur.com/CEQLaNJl.jpg I was wrong, that is a quick disconnect fitting that the factory would use. If that is a CP3, I wonder how they got the pressure to 29k and why my supplier says 2003-2018 CP3's aren't being made new anymore.
ShinerBock 12/21/20 01:24pm Tow Vehicles
RE: 2021 Ram 3500 H.O.

Shiner, this is a pic off the TDR that the guy took today off a 2500 2021 model. What say you now? I would still say that I would have verify it with my own eyes. Tell that guy to give you an ESN of the 2021 that he took that pic of and I can tell you for sure that it is a CP3 or CP4. Do you have a better picture of that? I cannot tell if that is a quick disconnect fitting or not. It kind of looks like it is versus the video from earlier, but is too dark.
ShinerBock 12/21/20 12:35pm Tow Vehicles
RE: 2021 Ram 3500 H.O.

According to FCA, they did not change the pump from a CP4 to a CP3. They did, however, change the from an asymmetrical to a symmetrical cam design. A CP3 would not look identical to a CP4. FCA TSB 18-060-20 https://i.postimg.cc/TPgms3w9/2021-HPFP.png height=650 width=500 Drivingline article on 2021 Cummins
ShinerBock 12/21/20 07:22am Tow Vehicles
RE: 2021 Ram 3500 H.O.

This is the type of fitting the factory would use. https://i.postimg.cc/JzW9t0Zf/cp3.png height=500 width=550
ShinerBock 12/20/20 10:33am Tow Vehicles
RE: 2021 Ram 3500 H.O.

Fake news. That is an aftermarket CP3 installed to make it look like it was factory. The line with all the paint would not be that type of fitting. The factory uses quick disconnect safety lock style fittings, not a flair style fittings. Although I will give them extra credit for the quality control style paint on the fitting. Man, people just believe anything they see on the internet these days without verifying it first. Just like that and hope is gone. Sorry, but there is no way a factory would use that type of fitting. It would cost them lots of time and money to have someone keep spinning a wrench to install that line on every truck versus a quick disconnect fitting that takes a second or two to install.
ShinerBock 12/20/20 10:26am Tow Vehicles
RE: 2021 Ram 3500 H.O.

Fake news. That is an aftermarket CP3 installed to make it look like it was factory. The line with all the paint would not be that type of fitting. The factory uses quick disconnect safety lock style fittings, not a flair style fittings. Although I will give them extra credit for the quality control style paint on the fitting. Man, people just believe anything they see on the internet these days without verifying it first.
ShinerBock 12/20/20 10:19am Tow Vehicles
RE: 2021 Ram 3500 H.O.

If I called my Dad "OLD MAN" I probably would not be able to type this. He doesn't mind it. He actually called his dad that. Althouh I far exceeded him at the gym many years ago. He can barely put up 225lbs on the bench these days.
ShinerBock 12/19/20 04:42pm Tow Vehicles
RE: 2021 Ram 3500 H.O.

Helped my old man install new injectors and sleeves on his 2003 7.3L today. And by help I mean I did 95% of the work. Man, the stuff I had to remove just to get to the valve covers. There was hardly any room on either side of the engine and the back two injectors were a pain in the arse getting the sleeves out. I can see why taking the cab off is standard practice on major repairs. To be fair though, the back two injectors on the Cummins is a pain as well, however, I don't have to take a bunch of stuff off just to get the valve covers. It would suck if we messed up and had to take all that stuff back off again since we have to put it all back on just to turn it over to verify the job was done correctly. Luckily we(I) got his 7.3l back on the road without a hitch.
ShinerBock 12/19/20 12:31pm Tow Vehicles
RE: 2021 Ram 3500 H.O.

No special tools FISH. Simply use a 5/16" and 10mm socket to remove the air tube from the air filter to turbo and reach in and R&R the filter with not a drop spilled. Also a easy to check the turbo for play. I would also take only having to change my oil filter 13 times over the course of 200k miles instead of 20.
ShinerBock 12/18/20 09:02am Tow Vehicles
RE: 2021 Ram 3500 H.O.

That is about the only advantage the Powerstroke has over the Cummins from a service/repair perspective. Now that I've changed the oil in my truck a few times, I'm actually pretty quick at changing the oil filter from the top with no mess. I'll take that over removing the cab to do just about everything else (the cab was off my 6.0L PSD twice). ;) Yeah, for something that I only have to do once a year or every 15k(versus 10k), it is not a big deal. I just use some plastic shrink wrap to cover the filter as I take it out from the fender well to keep it from spilling. Works like a charm.
ShinerBock 12/18/20 07:21am Tow Vehicles
RE: 2021 Ram 3500 H.O.

When asked for my opinion on the big three I just say go open the three hoods and then tell me. Well that kind of depends. If you are like 4x4ford where you will leave it stock and trade it in every 3-4 years without going past the warranty, then accessibility under the hood is not an issue. For people like us who will either modify, go well past the warrant period/mileage, and/or planning on doing our own repairs then it is a huge factor. I know with my brother's old truck, I would not want to do many of the things I have done with my truck because of all the stuff I would have to remove and what is involved. I would have likely paid someone thousands of dollars to do what I have done on my own to mine. This would also take all the fun out of it because most of the enjoyment of moding is being there with my son showing him how to do it and seeing his face light up when we get to test the results of what we did. Since this truck hasn't needed many repairs, moding is my only way to teach him.
ShinerBock 12/17/20 10:20am Tow Vehicles
RE: Going back to gasser based on needs (need advice)

For what you are towing, you do not need a diesel and having one would be a want. I would recommend trying to find a friend or someone you know with a modern gas HD truck and see if they will let you tow with it. Another option is to see if you can rent one for a day from places like U-haul, Home Depot, and so on. Most of the time they are fairly new and renting one for a day is cheap. This may help in the decision making process and it is better to find out in a rental that you can take back versus a purchased vehicle than you can't.
ShinerBock 12/17/20 10:02am Tow Vehicles
RE: 2021 Ram 3500 H.O.

Yes, there is considerably more available real estate under the hood of the Ram/Cummins compared to the Ford/Powerstroke. This was another one of my reasons for going with the Cummins; more room=easier repairs=less overall operating and repair costs over the long haul. There is a reason why most hotshotters use the Ram/Cummins! :C Yeah, I have done my own work on my engine except for the water pump that was replaced under recall by the dealership. So for I have removed some engine exhaust parts, replaced the turbo for a larger fixed geometry turbo, replaced the exhaust manifold for a higher flow pulse manifold, and installed head studs. I also replaced the after engine exhaust system myself which was kind of a pain in the arse holding the downpipe on the turbo with one hand while trying to the clamp around it and the turbo flange with the other. Never had an issue with space or needing to remove a ton of plastic parts to get to stuff.
ShinerBock 12/17/20 06:59am Tow Vehicles
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