Jump to content
SAU Community

Water Pump Differences

Roy

By Roy,
in Engines & Forced Induction

 Share

Recommended Posts

Roy Grand Master

Roy

Posted
Posted

Was considering running a Davies Craid Water Pump and controller, but dont really have enough time to get it working right between now and when i will be trashing the guts out of the car.

So will be replacing the timing blet, idler/tensioner etc etc this week and on the topic of water pumps wondering what is available off the shelf.

I understand that the problem at big revs is cavitation with the std water pump. So you can go to an N1, only that affects the lower rpm flow on the street. Hence the Davies Craig which would have been the best of both worlds.

Is there any difference between off the shelf Nissan water pumps and flow. RB20, 25, 26, 30 etc. Does anyone have acces to Nissan FAST and able to tell me the respective flows of each. Perhaps conform that a RB25 pump can be used on an RB20?

The whole cavitation, high revs and high temps at the track will hopefully be less of an issue with the header system im going to setup instead of running the EWP.

Be much appreciated if someone with FAST can also tell me if the RB20 and RB25 idler and tensioner bearings/pulleys are the same

Link to comment
https://www.sau.com.au/forums/topic/128169-water-pump-differences/
Share on other sites
Roy Grand Master

Roy

Posted
  • Author
Posted
The pumps are the same.

The idler and tensioners are the same also.

Oil pumps are the same.

Cam and crank seals are all the same.

Timing belts are the same.

hmmm....I could go on

So an RB20 water pump is the same as an RB25 water pump??? Doesnt sound right but wouldnt surprise me.

Duncan..ill let you know how the header system goes, I may install it after a session at the tack and see if it makes any difference. If it doesnt ill just bin it

legend01 Experienced

legend01

Posted
Posted

I fitted an rb25det water pump to an rb20det and only 1 bolt hole didnt line up didn't make any differance to the car didn't leak water seamed the same to me apart from the 1 bolt hole

Cheers Peter

Duncan Grand Master

Duncan

Posted
Posted

I don't know about the 20 and 25 water pump, but there are differences in the blades between 26, 30 and n1 pumps.

Also there is a difference in the bolt holes between 32 and later rb26 pumps, later ones have a longer slotted hole so there must be a difference in bolt point

discopotato03 Grand Master

discopotato03

Posted
Posted

Roy one on this boad runs the EWP but not for road , I really like the idea but I worry about the reliability of the plastic body . If it failed the engine could die quickly and there's too much money at stake for an RB30 . It would be entertaining to see if Davis Craig is prepared to wear the rebuild cost or only replace their bastard pump if it failed . I guess the only way to be almost safe would be to have the pump up near the highest point of the system so if it lunched itself there may be time to shut down and save the engine .

I may sound like a wuzz but I've seen expensive engines die because of plastic rad tanks failing so anything plastic in an engines cooling system I think is a risk . If and when they make an aluminium one I'm all ears . I don't suppose anyone knows pumping rates of the RB20/25/26/30 so we could fiddle pulleys to get a good/cheap solution ?

Cheers A .

PS: can the impellers be changed ie one off stuffed RB26 pump on cheap new RB30 pump or as the case may be ?

Roy Grand Master

Roy

Posted
  • Author
Posted
PS: can the impellers be changed ie one off stuffed RB26 pump on cheap new RB30 pump or as the case may be ?

LOL...your a thinker :pirate: I was expecting that the shaft / pulleys ect woudl be the same. Was hoping to get my hands on an old RB20 water pump and see if i can get a new impeller and bearings for it?!?!?!?!

As for the EWP beign plastic, it is some composite, so i hadnt really worried about that

Beer Baron Grand Master

Beer Baron

Posted
Posted

plus i dont think EWP failure would mean instant death. as long as you watched the temp gauge you would have plenty of time to shut the engine down. i would just install and idiot light to show when coolant temp goes 93 degrees+. I mean the water is just cooling stuff. and if the pump failed at least the engine etc would all still be full of coolant (unless it just literally fell to pieces - unlikely).

I think it's a great idea, the only thing that has stopped me is the unknowns.

  • 2 years later...
cruzin33 Veteran

cruzin33

Posted
Posted

Sorry to bring up a old thread but im about to service my rb20det eccs redtop and im in need of a water pump. My local motor mate has a rb30e water pump in stock for $65, i know they fit but will the rb30e pump flow completely different to the rb20 water pump?

STATUS Grand Master

STATUS

Posted
Posted

i have pulled many rb's apart and there are three impeller types i have come across plus the countless after market profiles (powermax, GMB, silverline etc) i will see if i can round them up from the scrap metal pile and post them up.

  • 3 weeks later...
cruzin33 Veteran

cruzin33

Posted
Posted
i have pulled many rb's apart and there are three impeller types i have come across plus the countless after market profiles (powermax, GMB, silverline etc) i will see if i can round them up from the scrap metal pile and post them up.

Any progress on the pics :)

QUOTE from a ebay seller: Please note that RB20 water pump is not the same as the RB25/RB26 water pump due to one of hole is different size. Water will leak out if you install RB25/26 water pump on the RB20

Is this true for the rb26 aswell?

Duncan Grand Master

Duncan

Posted
Posted

kind of....32 needs a single hole, 33 and 34 blocks have an elongated hole. r32 part is no longer available from nissan so no matter what you buy you get the elongated hole.

You can either over use the silicone gasket sealer, or have the hole tig welded up. I did the second option on my first motor but haven't bothered since

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      So, I put my boat on a boat. First of all, I'm going to come out and say it. Why is Tasmania not considered a holy goal, an apex that all road-legal modified cars go to, to experience? This place is an absolute wonderland of titanic proportions. If people are already getting club runs for once in a lifetime 30 person cruises to Tassy then I've never seemed to see it. It is like someone replaced the entire place with an idyllic wonderland for cars, and all of the people living there with paid actors who are kind, humble, and friendly. Dear god. After doing a lap of almost all of the place I've found that it's a great way to find out all of the little things that the car isn't doing quite right and a great way to figure it all out. All in all, I drove for 4 hours a day for a week and nothing broke. I didn't even need to open the engine bay. This is by all means a great success, but it has left me with a list of things to potentially address. I also now have a 3D printed wheel fitment tool which annoyingly hasn't got any threads in it to actually assemble it. I might be able to tape it together to check the sizing I actually want to use, but it'll likely involving pulling the shocks out to properly measure travel at least at the front, and probably raise the car while I'm at it, at least in the rear. I scraped on quite a few things and I'm not sure how else to go about it. I was taking anything with a bump at what felt like 89 degree angles. And address those 10 other tasks. And wash the car. God damn it is dirty. And somehow, the weather was perfect the entire time - And because I was on the top of Mt Wellington it turns out it was very much about to freeze up there. I did something I typically never do and took some photos up there in what must have been -10 and the foggy felt like suspended ice, rather than mere fog. If you own a car in Australia, you owe it to yourself to do it.
    • QB6SAGR
      Battle of the broken skylines

      By QB6SAGR · Posted

      Damn that was hilarious, and a bit embarrassing for skylines in general 😂 vintage car life ey. That R33 really stomped. Pretty entertaining stuff
    • cosline
      R32 gtr transmission strength, billet plate

      By cosline · Posted

      Hi, I have a r32 gtr transmission. Does any of you guys have an idea how much power it will hold with the billet center plate and stock gearset? At what power level and use did yours brake with or without billet plate? Thanks, Oystein Lovik
    • Rezz
      Spotted on the street....

      By Rezz · Posted

      Saw this replica police car based on a Mitsubishi Starion XX parked next to a 'police box' (it's literally a box) in Hirohata, Himeji City in Hyogo prefecture the other day. It's owned by Morii-san who is a local Mitsubishi Starion enthusiast. According to a local radio station blog post, he always wanted to make a police car himself based on ones he saw in his favourite Manga comics.  As it's illegal to modify a car to look like a police car and drive on the road, Morii-san tried many times to get permission from Aboshi police station headquarters nearby. They refused initially by after they got tired of that they granted him permission. However, the car can only be displayed on private property and obviously can't be registered as long as the police livery is present. The car was completed at a cost of 1.5 million yen (US$ 10,000) in addition to the car cost. A location was chosen outside Hirohata Police box where the car can easily been seen from the street. Morii-san has two other Starion road cars, both widebody GSR-VRs.
    • Murray_Calavera
      What should I do next to hold the head on

      By Murray_Calavera · Posted

      Ah coolant overflow, previous discussions make way more sense now lol. 
×
×
  • Create New...