Radiators- single pass vs double pass

[Matt49]

It isn't a moot tiny detail when it demonstrates your lack of understanding in a discussion on this topic. Turbulence means everything in our cooling systems and you can certainly build something into the system to increase it: namely a radiator with smaller tubes to increase velocity which increases turbulence.
My point is this: Just because you used a radiator with thicker tubing and got opposite results, doesn't mean that the thicker tubes caused better cooling. It means there was another variable you're not taking into account between the two radiators. Your real world experience doesn't really trump the scientific facts yet you talk down to those of us that don't choose to accept it. It's truly baffling.

And yeah...
Number of times I've tried to sell something in the tech forum = 0
Number of times you've tried to sell something in the tech forum = stopped counting a long time ago

[fastford]

Single pass cool better.

If you slow the water down with a double pass it is also slowed down in the engine absorbing more heat since it takes longer for the water to get from the inlet to the outlet of the radiator.

another dumb azz post by no it all, stay down there in them street stock section..BOYYYYYYYY......

[Lizardracing]

SCD is like a Chihuahua and a top.....Has a lot of attitude but it doesn't mean anything and if you get him going you can sit back and watch it go! It's pretty fun actually.

[cjsracing]

From my experience with my late model the Double pass reduced my water temp 20 degrees. It takes a really heavy track and a hot night to get it above 210 degrees, usually right around 180 to 190 degrees.

[fastford]

a double pass is good , but down here in the height of summer when its 95 degrees at start of hot laps, a triple pass is even better.

[fastford]

Thanks for being a loyal follower.

one thing I know for sure is I want be following you , unless im lapping you.....now go back where you belong....

[Matt49]

bahaha baffling is you thinking anyone cares about your pissing match with me. You should read all my posts on this much more slowly and about 10 more times. The only radiators with smaller tubes are the super cheap knock offs, none of the more commonly used name brand radiators run that thin of tubes. Maybe you should be messaging the big name radiator builders, Im sure they'll gladly pay your consulting fee!

For sale I have one Matt49= good for spell checking your posts and basically pointing out irrelevant details no matter how small. Often says the same thing over and over worded in a different way because he thinks the more words the better. Very loyal and determined. $.99 please take him, I cant meet his needs any more Im too busy selling race parts like

Ultrashield containment seats for $550 each shipped
Add a brand new Nexgen head and neck restraint with a seat for $1100 total shipped.

If you are saying that a thinner tubed radiator of EQUAL quality (and with a pump adequate to maintain flow) would cool better than a thicker tubed radiator...then I think we agree...which is why I'm trying to have a DISCUSSION about it. To see if we are saying the same thing or if I am misunderstanding and have a difference of opinion.

So I wonder why the "good" radiator manufacturers don't make a thinner tube radiator. Did they find that the flow restriction was the issue and that most folks weren't using a pump adequate to overcome this (meaning the heat build-up from slower flow was more of a con than the pro of additional turbulence)?
Is the flow restriction the only reason for the inadequate cooling or were other factors involved in the design of the more cheaply manufactured radiator at play?
These are legitimate questions I'm trying to ask in the process of having a discussion.
You make it a "pissing contest" when you throw in attempted put downs. Words are a good thing. They aide in peoples' understanding of the ideas you're trying to communicate. I won't apologize for using them.
We can continue with the discussion and perhaps learn something, teach others, etc. Or you can continue to insult people's intelligence. It's up to you.

[Matt49]

The only time our tracks stay heavy past the first couple of heat races is usually in the spring. What are you guys doing to get extra air to the radiators when it's hammer-down?
It seems to become more challenging as we get better at sealing off the nose. I was thinking of just putting some holes in the nose with a screen behind it and then it could always be sealed off later. I'm not a fan of the notch in the valence but maybe that would work better...

[PushinTheLimit]

I just put a new Afco double-pass radiator in my 604 crate this winter and I've also notched the front valence. I'm curious as to how that will affect my water temps as my old radiator was on its last legs toward the end of the season. I've had water temps ranging anywhere from 220-240 which I really would love to see that drop about 20 degrees overall. We'll see possibly next weekend as I'm planning to race then.

[TheJet-09]

In my part of the world (Northern IL) we'll have nights where it is hammer down through the feature. Not often but it happens. I have two ovals backed by screen in my filler panel (like Matt49 eluded to) that I just tape over if cool enough out, or for hotlaps (to reduce the amount of mud getting through). Each is about 3" high and maybe 8-10" across. Cutting the valance isn't something I've tried because you can't really "undo" it, and I've got bigger fish to fry than aerodynamics. My funny little story about this topic is from 3 years ago, when I just got back into racing. We had a lot of rainouts that year and I was just looking to get some seat time. So I made the 4 hour trek down to Quincy, IL one Sunday. As I was taping up my filler panel before hotlaps, I heard a meager voice ask "How often you gotta open them up?" As I began to answer, I turned, and there was Kenny Schrader in a firesuit (he was running a Modifed). My mind kinda went "uuhhh..." but I quickly remembered he's just like us, looking to have some fun on a Sunday night. He did tell me though, that back in the day he'd just cut some "slits" in the filler panel that he could bend up (almost like a scoop) to let air in, then push them back down when not needed. I appreciated his input!

[Kromulous]

I was under the impression that the double and triple pass radiators were used to create a stall in the radiator?

I think they say not to run restrictors and use 1 to 1 pulleys, then the water is faster inside the engine, and then slows down in the radiator.

Anyway, to the OP, get the double pass, 1 to 1 pulleys and a big fan, you will be fine. Thats what we run currently and it works with no shroud, other than a top cover. This year i made a shroud so i can crank up the timing and lean it out alittle.

[RCJ]

Afco's have a taller flange on the top and bottom to hook a shroud to.