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dleachOffline
Post subject:   PostPosted: Jan 30, 2012 - 03:13 PM
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You may be right about te efficiency being "over rated".
I have some doubt about the efficiency of a push/pull fan arrangement. It sems to me that the stronger fan has to push or pull, as the case may be, through the weaker fan. There may be some increase in air volume but one fan has to "drive" the other one, with a serious loss in efficiency.

Don
Building a 6.0
 
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jdinnerOffline
Post subject:   PostPosted: Jan 31, 2012 - 11:46 AM
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I am doing away with the four fan setup and going to run just the two Zirgo fans.
My results will be posted here in the Spring, March or April.

I think my biggest issue is the thickness of the rad and difficulty the fan has in drawing air through it.

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cribbjOffline
Post subject:   PostPosted: Jan 31, 2012 - 02:17 PM
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Jim, I know you're already committed to the Zirgo's but in case something goes awry, and IF you have the space, check out this 16" SPAL:

http://www.spalusa.com/store/main.aspx?p=itemdetail&item=30102803

Lore has it that SPAL developed this fan for applications where their previous highest output fan the 30102113 couldn't handle the high deltaP's of certain engine bays. If you look at the curves of CFM vs deltaP, you'll see the differences, and if you compare this fan's construction with the 30102113, you'll notice the blades are more robust.

I happen to have a certain red Italian hotrod that is equipped with a pair of the 30102113 fans, and it overheats in Houston traffic in 105 degree summer heat. The later model of this hotrod is equipped with the 30102803 and it doesn't overheat.

Might be worthwhile checking out as a backup to your Zirgo's.
 
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jdinnerOffline
Post subject:   PostPosted: Feb 01, 2012 - 09:56 AM
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It looks good but how many amps is that drawing? It looks like around 25 to 30 Amps. Is that right?

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wire2Offline
Post subject:   PostPosted: Feb 01, 2012 - 03:48 PM
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31 amps. 1950 cfm.
http://www.universalpartsinc.com/detail.asp?part=30102803

Oddly enough, the 30102113 is rated 26 amps, 3000 cfm;
http://www.universalpartsinc.com/detail.asp?part=30102113 and is $70 more.

Go figure.
 
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cribbjOffline
Post subject:   PostPosted: Feb 01, 2012 - 06:14 PM
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Yep, these are power hogs, but I really think most of the other manufacturers overstate their CFM's. We all know there's no such thing as a free lunch. Probably the most powerful fan on the market - the Lincoln MKVIII fan, consumes around 65 amps at startup, and better than 30 amps continuously in most "normal" applications. But it will deliver where no others will.....

@wire2, I think the Universal Parts website may have overstated the current consumption of the 2803 a bit. Here are the ratings directly from SPAL's website:
................@in2 H2O......CFM........Amps
2803 Fan:.......0............1953........26.6
2113 Fan:.......0............3000........26.0

NB: The full ratings and curves for the 2113 fan are not generally available unless you contact the factory, but if you're lucky enough to get them, and plot them against the 2803 fan, you'll see that the output of the 2113 starts out well above the 2803 (at 0mm H2O), but drops off quickly as the deltaP gets higher.

By 20mm of H2O (about 0.78 inches of H2O), the 2113 fan's output has dropped below the 2803, and by 28mm, the 2113 is struggling to make 500 cfm, while the 2803 is double that.

The 2113 is a great fan for a skinny radiator in an engine bay where you can get the air out. But the 2803 is the fan to have if you're in a high deltaP situation with a thick radiator and/or a well sealed engine bay.
 
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sbeckman7Offline
Post subject:   PostPosted: Feb 03, 2012 - 10:40 AM
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Jim,

I'm a recently graduated High School student. I've been following your build for several months now and I am continuously blown away by your work. I'm also using a BMW V12 in my own project, more of which I'll write about in a separate introduction thread. Anyways, is there a specific reason you chose the Haltech 2000 system for the engine management? I'm going to be purchasing a standalone system and this kept popping up as a good candidate. Thanks, and I look forward to more sound clips and videos!
 
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jdinnerOffline
Post subject:   PostPosted: Mar 19, 2012 - 02:30 AM
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I ordered the Zirgo fans last week and when the order desk at Performance Improvements learned of my order they called me back to talk me out of it. Zirgo has indeed overrated their fans cfm's and their quality is not that grat according to them.
I changed my order to SPAL 13" instead. This way I can shroud it in better.
I just updated my blog with a short video of the Haltech Platinum Sport 2000 running my engine. The reason I choose this computer is it will run the 12 cylinder where others won't. Great customer support too.
http://jimdinner.wordpress.com/

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dleachOffline
Post subject:   PostPosted: Mar 19, 2012 - 06:15 AM
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Isn't the SPAL 13" the OEM fan for the 6.0. At any rate its what I am using. I have 3" core, "out and back" crossflow circulation radiators. I expect to have good results even with my LS1.
One question that I have though: Are the dorsal inlets the only air that the radiators receive?

Don
Building a 6.0
 
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andpgudOffline
Post subject:   PostPosted: Mar 19, 2012 - 09:42 AM
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Did I get it right that you put a m70 engine int oa lambo replica?
That motor is sweet :O
 
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jdinnerOffline
Post subject:   PostPosted: Mar 19, 2012 - 10:28 AM
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andpgud wrote:
Did I get it right that you put a m70 engine int oa lambo replica?
That motor is sweet :O

Yes.

I also have some grill work in my inner fenders. The rad can get some air from there too. I'm not sure if the air turbulence on the highway is a negative factor. Still testing.

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jdinnerOffline
Post subject:   PostPosted: Apr 09, 2012 - 09:49 PM
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So I just installed the Spal 13" fans
http://www.spalusa.com/store/main.aspx?p=itemdetail&item=30102045

I ordered puller fans but pushers came instead, not sure who screwed up but I thought I'd mount them as pushers anyway.

OMG what a difference.
Before - 4 fans would come on idling at temperature and stay on until it was shut down. Both rads would shed heat out the grilles about the same temperature (testing with my hands)
Now - With 2 Spal fans only the first rad is blowing heat out the back significantly more powerfully. The second rad is blowing much cooler air out the back and the return line to the engine is virtually cold. The inlet to the first rad is too hot to touch and the outlet from the second rad is cold. The fans cycle on and off now, never did that before.
Of course this is just idling and revving but I think I have the problem solved. More to come next week.

The Haltech has a whole bunch of configurable outputs. I made one of them control the fans on and fans off. I should be able to regulate the temperature to maintain a nice 200* or so.

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dBOffline
Post subject:   PostPosted: Apr 10, 2012 - 01:25 AM
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Hi,

I have Spal 13" pullers on my quad core D&R Griffon rads.
They are on all the time.
I have not put a thermal relay in there.

dB..........
 
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dBOffline
Post subject:   PostPosted: Apr 10, 2012 - 01:33 AM
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Hi,

I have Spal 13" pullers on my quad core D&R Griffon rads.
They are on all the time.
I have not put a thermal relay in there.

dB..........
 
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rodrieguzOffline
Post subject:   PostPosted: Apr 10, 2012 - 02:41 AM
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Sweet info

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