I've decided to upgrade to the Johnson intercooler pump on my car. 70GT6 turned me on to a good deal from APE and thanks again for that, dude.

When I was looking over the specs I noticed the model they sell has 3/4" fittings. I thought that seemed a little bigger than the tubing coming out of the intercooler on the engine and measured it with a caliper. Sure enough it measures closer to 5/8".

Those of you who have done this upgrade, what size fittings were on your pumps. You would think bigger is better flow wise...and I'm cool with that...but there is not alot of room for adapters down there...
and while stuffing an oversized Johnson in and under sized hole can in other circumstances be a whole lot of fun...I don't believe this is such a case.

Please hip me to the skinny here guys...I'm ready to order!

 

Not according to any of the experts with which I have checked.

You knew that one was coming. I just thought we ought to get it over with.

No! I imagine if you can fit it in the fender bay, it can't be too big. pressure should not be an issue unless there is a system blockage.

 

Sorry to disagree Franc but YES they can be TOO big.
This is an aluminum intercooler and when increasing flow especially the amount at hand internal wear becomes a problem.
There used to be a SRT owner on forum here that had a engineering degree in hydralics he may see this and reply.
But in the mean time I assure you internal ware is a real and serious byproduct of going to big...
Mike

 

You are talking really big then.

What is "ware"?

Did you mean erosion?


I would be more worried about pressure.


roadisaster with a steek.

 

If your johnson is to big.... and your wares are to tight..... then yes I would consider it to be too much pressure

 

I knew this would go bad, just didn't know when....

 

In that case an explosion is imminent.

 

Are "wares' the same thing as ******?...If so, I guess if your Johnson is responsible for a bunch of "wares"....He mus' be a pimping mack daddy...

But seriously folks...I've done a little research and the CM30p7-1 comes in both 5/8" and 3/4" sizes.

Which be da right one fo our application?

Oh BTW, thanks Montana Crossfire for the words of caution...I plan to isolate the intercooler system from the engine setup which should give me a net reduction in pressure on the intercooler core...I think...

 

Internal pressure is minimal when you are sumping what you are pumping so a higher capacity pump isn't likely to be an issue. Pressure is the result of resistance against the pump or a volume increase the result of temperature expansion in a closed captive system. By separating from your engine system, this is to be an open (ambient) system so, I don't think that is an issue here either.

My two rubles worth.

roadisaster with a steek

 

Hey -
I do not see where the CM30 is available with a 5/8" outlet.
You can get a CM10 that is 5/8"

Johnson Models

 

Well, my Johnson is setting on the shelf ready to be used and abused...man, that sounds bad....but, I have a spare, just in case...

 

Check out the Pumpvendor link below:




Johnson CM10P7-1 & CM30P7-1 Series Mag Drive Centrifugal Circulating Pump

 

I think I may have just answered my own question. The 5/8" model is only rated at 5.2 gals/min. while the 3/4 moves 6.9....That's why he's the "BIG" Johnson...

The 5/8" is probably closer to the stocker.

 

well if your johnson go bad on you, good to have a spare

 

My wife has told me on many occasions that my Johnson is too big, but that is another story.

 

Really Bob? Did you have to go there? lol

There are a LOT of different opinions on "going big". I'm one that believes you will not gain a much/if any by moving coolant though the system faster. In order for an intercooler to extract heat, the coolant needs to spend some time in there... just my .02

 

Couldn't that company have had another name for their pump....the "Big" Johnson would be a great marketing "Tool" if they were to use it....I bought the JP, how's that, as a spare a couple of years ago...sooner or later, it will get installed, maybe when I install the separation kit on the coupe....