shroud, fan and clutch upgrade - Chevelle Tech
Heating & Cooling Heating, cooling and air conditioning

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post #1 of 8 (permalink) Old Jun 30th, 20, 12:15 AM Thread Starter
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mike
 
Join Date: Dec 1998
Location: lakeville,ma
Posts: 1,014
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shroud, fan and clutch upgrade

currently running the gm truck aluminum radiator with plastic tanks on my 1969 chevelle ss. has the stock shroud that covers about 3/4 of the radiator. also has a high quality 17.5" flex fan. with temp sensor in head seldom goes over 185-190. got caught in heavy traffic at a car show(1 hour idling) in heat and crept up to 225 on me. too hot for my liking. i believe the radiator is supposed to fit a p30 step van. my plan is to add the following parts. https://www.rockauto.com/en/moreinfo...425834&jsn=259
https://www.rockauto.com/en/moreinfo...669832&jsn=261
https://www.ss396.com/chevelle/AFS-7...EaAkLwEALw_wcB
really don't want to go electric. wondering if anyone has done a similar swap. thank you mike


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post #2 of 8 (permalink) Old Jun 30th, 20, 6:46 AM
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Gene
 
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Re: shroud, fan and clutch upgrade

Mike, that is exactly the setup I use and the only issue I have it that it runs TOO COOL! Right at thermo opening. Be sure the fan lays 1/2" or so off the rad. I cant recall if I use a spacer or not right now; dont beleive so. Short pump tho, in a '67.

Gene
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post #3 of 8 (permalink) Old Jun 30th, 20, 9:39 AM
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Greg.
 
Join Date: Apr 2011
Location: Ottawa, On, Canada
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Re: shroud, fan and clutch upgrade

First that Mech Fan only has 3 Rivets in it VS others that have 4

Why would you buy the 71-75 Shroud that only covers part of the Rad Core ?

If your Rad Core is 28" to 29" Wide by 18" High then buy one of these
depending on whether a SBC or BBC and Short or Long Water Pump
and if the Fan is Centered in middle of the Rad Core
AFS-68B
https://www.ss396.com/mm5/merchant.m...&xscreen=prodb
AFS-68BS
https://www.ss396.com/mm5/merchant.m...&xscreen=prodb

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #4 of 8 (permalink) Old Jun 30th, 20, 10:59 AM
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pete
 
Join Date: Mar 2014
Location: virginia
Posts: 48
Re: shroud, fan and clutch upgrade

Quote:
Originally Posted by ratuned View Post
currently running the gm truck aluminum radiator with plastic tanks on my 1969 chevelle ss. has the stock shroud that covers about 3/4 of the radiator. also has a high quality 17.5" flex fan. with temp sensor in head seldom goes over 185-190. got caught in heavy traffic at a car show(1 hour idling) in heat and crept up to 225 on me. too hot for my liking. i believe the radiator is supposed to fit a p30 step van. my plan is to add the following parts. https://www.rockauto.com/en/moreinfo...425834&jsn=259
https://www.rockauto.com/en/moreinfo...669832&jsn=261
https://www.ss396.com/chevelle/AFS-7...EaAkLwEALw_wcB
really don't want to go electric. wondering if anyone has done a similar swap. thank you mike

One hour idling? Auto trans cooled via car's radiator? A/C on? Those are hard conditions to ask a cooling system to handle (don't know if your car has those). But, if it's a 'once in a blue moon' occurrence, I would not do anything to the car. The idiot lights did not glow 'hot' until about 240 F. Many cars got to 225 F in those conditions and the driver never knew it.

If available to you, put the car in N, turn off the A/C, and turn the heat on HIGH. All those operations will help lower the temps.

If you HAVE to do something:

A fixed steel 6 blade fan (installed properly in a proper shroud) will pull more air thru the radiator at idle than a 'high quality' flex.

Fan clutches do not improve cooling. They de-clutch the fan when the engine temps do not require it (the fan) for cooling; freeing up the torque for propulsion.

A transmission cooler will remove that load from the radiator/fan.

Just trying to be helpful.

Pete
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post #5 of 8 (permalink) Old Jun 30th, 20, 9:53 PM Thread Starter
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mike
 
Join Date: Dec 1998
Location: lakeville,ma
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Re: shroud, fan and clutch upgrade

thanx guys. it runs about 160-190 around town in light to moderate traffic. if i put in neutral and brought up revs it dropped about 10 degrees. thats why i was thinking a 7 blade clutch fan and bigger shroud might make a big difference. I have a long water pump and thats why i didnt even think of the 68 shrouds. plus that blade is a full 19.5" in diameter. thanx for your input guys
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post #6 of 8 (permalink) Old Jul 1st, 20, 1:23 AM
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Greg.
 
Join Date: Apr 2011
Location: Ottawa, On, Canada
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Re: shroud, fan and clutch upgrade

It is more important to have the Whole Rad Core covered by the Shroud than a big Azz Fan

And what ever Fan fits in the 68 Shroud Opening/Hole that the Blades of it is 1/2 IN and 1/2 OUT
japete92 likes this.

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #7 of 8 (permalink) Old Jul 1st, 20, 9:28 AM
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pete
 
Join Date: Mar 2014
Location: virginia
Posts: 48
Re: shroud, fan and clutch upgrade

Quote:
Originally Posted by ratuned View Post
thanx guys. it runs about 160-190 around town in light to moderate traffic. if i put in neutral and brought up revs it dropped about 10 degrees. thats why i was thinking a 7 blade clutch fan and bigger shroud might make a big difference. I have a long water pump and thats why i didnt even think of the 68 shrouds. plus that blade is a full 19.5" in diameter. thanx for your input guys
Sounds 'fixed' to me.

Before spending $ on parts you THINK might help, check the ignition timing.

Recommend read this:

https://www.chevelles.com/forums/374...ion-101-a.html

Getting the timing correct is essential to the car running at the proper temp.

Also, recommend reading almost any of the threads in the 'ignition' section written by Dave Ray. His advice on timing and vacuum advance is exceptional.

Your car, your $, do as you wish.

Pete
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post #8 of 8 (permalink) Old Jul 1st, 20, 10:55 AM
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Jeff
 
Join Date: Jun 2009
Location: Pittsburgh, Pa.
Posts: 2,773
Re: shroud, fan and clutch upgrade

I always throw my car into neutral when stopped in the heat. Ever since I installed the Hurst Autostick I shifting manually is second nature..

You could mount a fan under the hood to help lower under hood temps.. I try to keep my underhood as uncluttered as possible. Every nut bolt and bracket you have under there holds heat so if it not needed remove it..
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