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Power steering pump options

patooyee said:
Maybe the two bolt holes are spaced the same as the two opposing ones on a TC? I called up there a while back and asked this question and they confirmed that they were the same. I seem to recall they had 3 holes back then though so maybe they have changed the design since then.

I wonder if the belt spacing will work? :dunno:
I am sure I can get the pump mounted. But I would rather not have to make a pulley. :(
 
this is the pump i purchased… doesn't have multiple views of the part but there's only two bolt holes and they are the same spacing as the opposing holes of a TC, i had a PSC "built" tc pump previously but it didn't keep up..

http://www.krcpower.com/ecommerce/cast-iron-pumps/cast-iron-steering-pump-without-pulley.asp

KRC has any pulley you could need to fit their pumps, but that may not be what you were asking..

What engine are you running? they have brackets for SBC and SBF, and there are factory brackets out there for LS motors to mount this style pump
 
The only thing that weirds me out about KRC is that the iron pumps are limited by RPM and there is not a big enough pulley to get the rpm's into that acceptable range on an LS engine. I've never heard of anyone who had an issue with a KRC but they will tell you that if you are using the iron pump on an LS they won't warranty it. They say you need the $700+ aluminum pump on an LS engine. They even sell LS brackets for the iron pumps but still won't warranty them.
 
Is this guy running an LS?

I guess since Im not in LS mode on this build, I'd forgotten that piece of tech…

What about running a slightly larger crank pulley on LS? seems like a slippery slope cause it would slow down the water pump and alt also, I would think the PCM could compensate for the alt speed.

Makes me wonder why they limit the speed on one type pump vs the other, seems like the internals could be designed the same.

I really like your long term mission of debunking PS pumps and what makes them different and better than others….
 
zjtrey said:
Is this guy running an LS?

I guess since Im not in LS mode on this build, I'd forgotten that piece of tech…

What about running a slightly larger crank pulley on LS? seems like a slippery slope cause it would slow down the water pump and alt also, I would think the PCM could compensate for the alt speed.

Makes me wonder why they limit the speed on one type pump vs the other, seems like the internals could be designed the same.

I really like your long term mission of debunking PS pumps and what makes them different and better than others….

In his first post he mentioned "truck bracket." Generally when people refer to that they are referring to LS. The rest is just my assumption.

You would need to reduce the crank pulley size, not increase it, to slow the pump down. There are smaller than stock crank pulleys but like you said, it screws with the water pump and alternator also. They make matching alternator pulleys but not water pump for LS. Plus, the aftermarket crank pulleys are really expensive and more than most people care to invest just to get a PS pump working properly.

I also wonder why the speed limit on the iron pump. I can say that the only obvious thing I've seen done on aftermarket pumps that is any different than properly reman'ed pumps is that the intake on the housing will sometimes be ported. That indicates that someone somewhere seems to think that intake becomes a restriction when seeking additional flow. If KRC was somehow unable to get enough intake on the iron housing and designed the aluminum to correct / improve on that I could see a higher rpm rating. KRC really seems to have the science of the pumps figured out IMO. That's why the rpm restriction on the iron housing worries me. Its like if they have it all figured out so good they must know their pumps doesn't like higher rpms for sure. But then I hear of lots of people over-revving them without issue and wonder ...

PS pumps really intrigue me. I wish I had a good flow meter to accurately gauge pumps. If I did I would rig up an engine on a stand just to run PS pumps and publish some actual findings. I've killed so many pumps in the past and now I've looked inside so many that I feel very confident in saying that a lot of companies are not putting out what they say they are.
 
The overspending of pumps is something i've been paying attention to for several years now also, back when my zj rig had a 4.0 in it I was absolutely sure thats why I was killing pumps.. I found a bracket at PSC to mount a LS style P pump on there and my issues went away with the 4.o setup and I continued on that trend when I did the 5.3 swap. I've had great luck with P pumps lasting and not completely dying on me although i did shear a pump shaft once.

I've aluded to it in my posts but didn't want to put PSC down and start a pissing match but your comment is basically what the KRC rep said to me on why he sent the pump with the same settings that PSC advertises, he basically said the PSC pumps don't really put out what they say they do as a rule of thumb. He said you may get one that does but its hit or miss, he said their pumps function as advertised outputs… but I'm with you, I'd like a way to verify this stuff myself…

I've read that TC and other bouncers are running KRC stuff, I wonder if they are all running the aluminum pumps or if they've discovered that you can overspeed the cast iron pump and be ok..

My 3800 rev limits at like 5800, stock LS is 6k right? Is the pump speed that much different given such a small rpm change… I know its common to increase the rev limiter on the LS's but how far out of KRC's preferred rpm range is it?
 
The problem with LS engines is only partly the higher redline. (Stock LS engines come from the factory anywhere from 6000 - 6300.) Its also that their crank pulleys are 1-1.5" bigger than most other engines. So the bigger crank pulley compounds the higher rpm issue exponentially. Just an example:

A stock 7.5" LS crank pulley at 6300 rpm spins the stock 6.5" ps pulley at almost 7300 rpm.
A 6" crank pulley on an engine with a 5800 rpm redline spins the same 6.5" ps pulley at 5300rpm, 2000 less than the LS.

I think the biggest pulley KRC sells is 6"? That means the KRC on an LS is at almost 7900 rpm. I think their stated limit on the iron pumps is down in the 5000's if I'm not mistaken.
 
cool, makes sense…

KRC wants the iron pump limited at 5500.. the biggest pulley they have for the cast iron pump is 6.5… thats what i have on the 3800.. the stock pulley was 5.75
 
So even at 6.5" on an LS the iron pump is able to spin 1800 faster than they want.
 

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