Fan clutch - Team Camaro Tech
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post #1 of 9 (permalink) Old Jun 14th, 11, 07:39 AM Thread Starter
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jeff
 
Join Date: Jun 2006
Location: texas
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Fan clutch

I need some help. Per Hayden, the correct fan clutch is a 2705 (standard duty thermal) for a 69 BBC Camaro and no HD ones are available. I have come across different posts that recommend different numbered clutches, is there HD version available or is there some confusion on which clutch to use for my car?

Thanks for any help on this, Jeff
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post #2 of 9 (permalink) Old Jun 14th, 11, 05:27 PM
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Steiner
 
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Location: Lyman, SC
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Re: Fan clutch

Do you have a heavy duty fan? Clutches and fans have to be matched. If a heavy duty clutch is installed on a standard duty fan there's a chance it can come apart at high RPM's since it'll spin faster than with a standard duty clutch. With a good cooling system a standard set up should be plenty up to about 6500 RPM.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #3 of 9 (permalink) Old Jun 14th, 11, 05:49 PM Thread Starter
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jeff
 
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Location: texas
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Re: Fan clutch

Yes fan is a 772 with a stock fan shroud, radiator is a Griffin aluminum stock replacement, water pump is a Weiand aluminum, 180 stat with 2 holes and fan clutch is Hayden 2705. Im in texas with 100 degree heat and my temp climbs when sitting at a light, its fine when moving. I am looking for a little extra cooling when stopped and think that the Haden 2747 is a HD unit that will move a little extra air but not sure of the fit.
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post #4 of 9 (permalink) Old Jun 14th, 11, 06:20 PM
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Steiner
 
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Re: Fan clutch

How much of a climb are you seeing and where's your temp probe installed?

Yes, the 2747 ought to be the same physically as the 2705 but will spin the fan faster when it engages.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #5 of 9 (permalink) Old Jun 14th, 11, 06:29 PM Thread Starter
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jeff
 
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Location: texas
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Re: Fan clutch

Sending unit is in stock location on drivers side of block, I have also changed it out and both operate the same. I get a steady gauge climb when stopped but comes down to normal once moving.

Thanks for the confirmation on the 2747, I think it should do the trick.
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post #6 of 9 (permalink) Old Jun 14th, 11, 06:40 PM
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Steiner
 
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Re: Fan clutch

If you mean in the head, it's not uncommon to see a good bit higher temp there than what your thermostat rating is. Also consider that your t-stat just starts to open at 180 and will be fully open at about 195. For instance, I read about 175 on my ECT sensor in the intake when the mechanical gauge in the head reads 190+ with a 180 t-stat. When my car warms up, my mechanical gauge will run to about 195 and then you can see the t-stat open up. I never see over 180 on the intake manifold sensor. Pinging the engine all over with an infrared gun showed the manifold reading was closer to actual.

That said, if you've got the HD fan then there's no reason not to put on the HD clutch as well.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #7 of 9 (permalink) Old Jun 14th, 11, 06:50 PM Thread Starter
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jeff
 
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Posts: 212
Re: Fan clutch

Yes the sending unit is in the head and thanks for the help. Tomorrow I will pick up a2747 and see if it helps.
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post #8 of 9 (permalink) Old Jun 14th, 11, 07:18 PM
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Tom
 
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Re: Fan clutch

if your radiator core is stock replacement you should be OK. the 2747 is 3.34" overall depth, the 2705 is 3.11" so it'll move about 1/4" closer to the radiator

http://www.haydenauto.com/upload/Hay...fan-clutch.pdf

I know this cause I am really tight running a 3" thick Griffin core (3.5" overall) stuffed in my 69 and have been trying to find a HD clutch thats more like 2.75" overall with no luck.
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post #9 of 9 (permalink) Old Jun 15th, 11, 05:41 AM Thread Starter
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jeff
 
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Re: Fan clutch

Thanks for the info Tom. I measured this morning and have a good 1/2" between face of radiator and fan. Should fit with no problems.
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