Engine/Transmission (1998.5 - 2002) Bosch 275 Injectors

[aviatorman]

02 H. O. 6 Speed with 130K on the clock. Injectors are getting lazy and I'm wanting to change up to the Bosch 275 units. The Diesel Store advertises a marine 300HP injector for the 2002 ISB engine. Are these the same injectors as the RV 275 Bosch units that everybody talks about? About how long would it take me (average mechanic skills) to change out the injectors? Thanks in advance to any and all responders

 

[HBarlow]

I'm sure the 300 hp marine injectors are NOT the same as RV275s. The Bosch RV275 injector has been a very common but conservative improvement to the 24 valve engines for about ten or more years. They work great on the street and alone won't tear up your drivetrain. They will provide about 285 hp and mid 500 lbs. ft. torque on an HO six speed truck like yours according to tests Joe Donnelly conducted and reported around 2001.

Joe installed a set of 275 injectors in my '01 HO six speed back in summer of 2001 when it only had around 10k miles on it. The same injectors are still in the truck now at 350k miles. I pulled heavy trailers with that truck for most of those miles. You will need and want gauges if you install them to avoid excessive egts.

Marine engines operate in a very different environment. Unless you are willing to step across the line into a more heavily modified engine my advice would be stick with RV275 Bosch injectors.

Some knowledgeable TDR member will provide the p/n of the 275 injector.

 

[Mundgyver]

The difference between the stock injectors and the 275 are tip holes. The stock injectors have 5 holes while the 275's have 7 holes in the tip. The 275 tip holes are smaller the the ones in the stock and provide better atomization of the fuel into the cylinder. This is why you get a gain in HP and TQ and also about 1. 5 mpg increase in economy. I have 250,000 on the clock now and no problems with them. They are a good reliable upgrade and when coupled with an Edge EZ make for a very enjoyable improvement in driveablilty.

 

[KcoleKennyc]

I ran a set of 275's for about 100K miles along with an Edge EZ. The combination worked very well but I lost 1 mpg, don't know why. Most of my miles were pulling heavy loads and it really made a difference.

 

[HBarlow]

Aviatorman,

No one has provided hte p/n for RV275 injectors yet. PM Joseph "Joe" Donnelly if you are still looking for the correct p/n and a source. Joe used to be a good source for them but I don't know if he still sells them.

 

[aviatorman]

HBarlow: Thanks for the quick reply. The Diesel Store says that these marine nozzles are the same as the RV275's , as in "same part number". The PN is 0432193635 and so I took a chance and purchased a set. Since these guys advertise through the TDR , I guess I trust them, ,they were very helpfull and that goes a long way with me. Now to try my mechanical skills at changing the "sticks".

 

[painekiller]

just put a set in my 99', they make quite a difference. took me about 2 hrs. and this was my 1st time.



some good info in this thread

5. 9 Cummins 24V Injector nozzle installation - Diesel Bombers



this company sells them at a good price.

Diesel Auto Power- Get extra Horsepower for your Dodge Cummins, Ford Powerstroke, and Chevy Duramax Trucks

 

[firefighter_2000]

Cheapest

As quoted on another posting:



i did some searching and calling and the best deal i could find was Peak Diesel Performance Inc. (604 532 5700) set of 6 Bosch RV275's shipped to my door was $327 NO core charge.



Hope that helps

Craig

 

[BoeingDiesel]

Aviator, you won't regret going with the RV275's. I'm averaging 21-1/2 MPG on my 99' commute truck and there was a noticeable increase in TQ.

 

[mhenon]

Vulcan has them too. About the same price as Peak Diesel Performance:

New Bosch RV 275 Injectors

 

[drag racer]

The difference between the stock injectors and the 275 are tip holes. The stock injectors have 5 holes while the 275's have 7 holes in the tip. The 275 tip holes are smaller the the ones in the stock and provide better atomization of the fuel into the cylinder. This is why you get a gain in HP and TQ and also about 1. 5 mpg increase in economy. I have 250,000 on the clock now and no problems with them. They are a good reliable upgrade and when coupled with an Edge EZ make for a very enjoyable improvement in driveablilty.

agree 100%. RV275s +Edge EZ = a nice power upgrade that the stock trans. can handle. I love mine. Oo.

 

[HBarlow]

HBarlow: Thanks for the quick reply. The Diesel Store says that these marine nozzles are the same as the RV275's , as in "same part number". The PN is 0432193635 and so I took a chance and purchased a set. Since these guys advertise through the TDR , I guess I trust them, ,they were very helpfull and that goes a long way with me. Now to try my mechanical skills at changing the "sticks".

Thanks for the feedback. I didn't know the Bosch 275 and 300 hp injectors are the same.

 

[mhenon]

So in a 24v HO engine you start out stock at 245HP. Do the Bosch RV 275's give you 275HP or something more than that?. Anyone actually dyno'd before and after an installation?

Mike

 

[jkidd]

HO Injector nozzle has smaller holes so a set of RV275 will = higher HP with an HO, expect 10-20HP more on the HO, but expect about 10-20HP less out of a performance chip on an HO

Marine/rv275 300/275 are both the same its a marketing gimmick

 

[jeepit]

I'd like to get aset of these but don't trust my mechanical skills for this project. Anyone in the eastern Wisconsin area care to help me out or recommend a shop??

 

[BarryG]

I also have had them in my 01 for the last 230k with no problems and as stated previously the 275's and an ez make a very nice driving truck.

 

[DMather]

So, who has rv275's in stock at a good price. Been trying all week to buy a set and have come up empty.



jeepit - where is the barn in WI?

 

[DMather]

RV275's are in... definite difference. On cruise, over the 30 mile loop that I use as a "standard", I was getting 2 mpg better milage OR 10 mph faster for same consumption.

 

[jeepit]

So, who has rv275's in stock at a good price. Been trying all week to buy a set and have come up empty.



jeepit - where is the barn in WI?

Town of Sheboygan.

Where did you end up purchasing the injectors from?

 

[DMather]

You are about the same distance north fo Milwaukee as I am south west of it. Not exactly local. ;-)

I found a good price and in stock from PDR Diesel
PDR Diesel Performance: Bosch 275 RV 40HP Injectors 1998. 5-02 Dodge Cummins

My change out was easy because I had all the injection lines off the engine. I think if the three hold down blocks were loosened it would allow enough "wiggle room" to get the feed tubes out without disconnecting them from the pump.

Torquing #5 & 6 is a bit fun because they hide under the engine "cowl". A pair of plastic sticks served as pry bars to pull the feed tubes and I used a long bolt in the end of the injector to pull out the old ones and set back in the new ones. (Crows foot is needed so you will need to calculate the compensated torque for the length of you crowfoot. This is easy. Measure the distance from the center of the torque wrench socket to the handgrip pull point and also the length from the center of the socket to the center of the crowsfoot. Then multiply the torque desired by the first measurement and divide that number by the total of the two measurements. The result will be the torque you want to set the wrench to. )

I had the rockers off but pulling the injector probably can be done without removing anything but the valve cover.