Just wondering if anyone is familiar with dual pass radiators or if anyone is running a custom designed one. Why doesnt anyone sell them for the RX7, are there any spacific problems with them???

STEPHEN

 

I had one built for my car from C&R Racing. I haven't installed it yet. the double pass type is more efficient

 

K2RD unit is double pass.


-Ted

 

Ted, I thought I had read that somewhere but I couldnt find any info on that product on the website.

Do you happen to know the size of the K2RD and also the fin count per inch?

STEPHEN

 

I have a double pass radiator. My car isn't completely together yet, so I can't make any claims, but seeing as though its twice as thick (2 row) as after market drop in (Koyo, Fluidyne etc) with the same frontal are and its all aluminum and double pass, it should work extremely well in my soon to be 400+ rwhp turbo II with ac.


https://www.rx7club.com//showthread.php?threadid=188420


~Mike..............

 

Can you do me a favor and get the fin count? All you need to do is count how many fins there are in one inch.

Thanks,
STEPHEN

 

Why do you want one SPO?
Have you read something about them that makes them better?
And are they simply built like RacerXtreme described them or is that not correct?
If it is then Chuck could probably fix you up with his if that interests you.
Because the one I was describing to you is identical to the diagram that racerx describes, but simply using one core and welding a divider inside the center top tank


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^dual pass.... actually made up of two cores (one stacked on top of the other) flowing horizontally instead of up and down.

 

here is a better pic i found
again paste it into a new window without the [/url]

http://www.nopistons.com/forums/uploads/post-13-1083001614.jpg[/url]

 

Yea, a radiator company told me dual pass is approx 7% more efficient if done right. The only prob is I read online that they can cause a flow restriction that is harder on the water pump. Seeing as though I have no air pump the water pump pulley doesnt make real strong contact with the belt and that had me a little concerned since i MIGHT be adding a restriction into the system. Now that I see there are pleanty of people running them and Chuck's selling them I'm not so worried about it. I just didnt want to spend money on this one off radiator I'm doing to have water pump problems.....course then I would have an excuse to go w/ electric water pump hmmmm LOL

BTW - I posted this thread the other day before you posted in my 3rd gen section thread.

STEPHEN

 

SPOautos,

I'll do a fin count tonight when I'm home were my rad is.

The rad I'm using is 2 rows of 1" cores with the fins furnace brazed (not loose or epoxied). So there shouldn't be a flow restriction. Its not actually 2 cores stacked up on one another, its a single with one side divided, just look at the pic I attached in the thread I posted. I could see there being a flow restriction if it were a single row (like most drop in aftermarket "high performance" radiators are), but its 2 row.


FWIW, as I stated in the other thread, I have less then $300 in my rad.

~Mike................

 

If you are worried about your water pump not getting enough contact than switch to a dual pulley system. It may not give it double the surface area but it will improve the amount that makes contact.

- Steiner

 

I was going to suggest this, but in his profile it says hes got a third gen. And it actually does double the contact area.

~Mike.................

 

And that’s why I came up with this solution, while I actually haven’t got a chance to try it (will shortly) I think it takes care of the issues associated with deleting the WP
https://www.rx7club.com/showthread.p...hreadid=270788

 

Here's one I bought for my FD



My brother has the exact same one on his FD and his car runs really cool. And the best part is it's 3" thick and is the same price as the Koyo rads.

 

NICE SET UP LT-1!

{QUOTE}And that’s why I came up with this solution, while I actually haven’t got a chance to try it (will shortly) I think it takes care of the issues associated with deleting the WP {END QUOTE}

You mean AP, not WP right?? AP=Air Pump, WP=Water Pump?

Mines 3" thick also, and again, less then $300, actually less the $250 (Koyo's and Fluidynes go for over $350-400 plus shipping) but I still need to have some sensor bungs weded in a long with a heater core supply line.

~Mike.................

 

ya ap not wp

 

Nice radiator LT1
You obviously run that vert mount yes?
What are the dimensions on the radiator?

 

Where did you get the little pulley and how is it mounted up?

Any of you guys running a fan other than the stocker? If so how is it working and what fan is it?

STEPHEN

 

I think people have come to the conclusion that the stocker flows pretty well already, no need to upgrade it.

The pulley is a stock alt pulley with high speed/load SS bearings.
I am thinking I might duel point mount it rather than cant it, even though it should be strong enough with the size and type of material I used

 

Yea, I know the stock fans are good but I'm wanting to keep the same over all size (rad + fans) as stock but with a much larger rad which means I need some different low profile high flow fans. I was looking at some Spal fans but not knowing what the stock cfm is its hard to decide what I need. Thats why I was wondering if anyone else has run different fans, and if so what they were.

STEPHEN

 

So did you just make a bracket off one of the water pump bolts and a front cover bolt and mount that pulley to the bracket?

STEPHEN

 

Just off the WP, and caught like the bottom 3 bolts. It seems plenty strong as the distance to the pulley isn’t very long. Still think I might make a bracket that goes around the pulley so it is not canted off of the bracket so the bearings work a little better.

 

SPOautos,


My rad has a 14~15 fin per 1" density.


~Mike...................

 

16 fins per inch
http://www.secureperformanceorder.co...ProductID=2515


-Ted

 

Nice find Ted, looks to be the exact thing I have (spec sheet reads exact), but I ordered it 24X19 instead of 26X19. It just fits better. I might of been off on my fin count, I counted as I was leaving for work in a hurry. I didn't order it from these people, it was around the same price.

~Mike..............