Electric fan size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Lippyp · 09-23-2009, 07:43 AM

What is the largest size dual fans you can fit on a standard radiator? I have a line on some cheap oem electric fans but they are about 18" diameter including the guard/housing etc. Wil I be able to get two on if I stagger them up and down slightly or are they just too big? I guess I should go and measure the rad but its raining and it means wrestling my truck cover off too.

rwolf9653 · 09-23-2009, 08:10 AM

I think that two 18" fans would be too big to be set up on the same side. You could set one on the inside as a puller and another on the outside as a pusher.

Lippyp · 09-23-2009, 08:45 AM

Would one 18" fan be enough to cool a mild 350 with a decent shroud? At the moment it has a fairly small electric fan bodged on in one corner by the previous owner and to be fair its never overheated and as its on a manula switch I only really need to put it on in heavy traffic.

rwolf9653 · 09-23-2009, 11:17 AM

Quote:

Originally Posted by Lippyp

Would one 18" fan be enough to cool a mild 350 with a decent shroud? At the moment it has a fairly small electric fan bodged on in one corner by the previous owner and to be fair its never overheated and as its on a manula switch I only really need to put it on in heavy traffic.

There are a lot of other factors that can make this statement wrong, but one 18" fan can properly cool a 350.
I run my 85 K5 350 with a one 16" fan and a second pusher fan that is there in case I need it. I have not needed it yet in four years. BUT, I have a manual trans so there is no hot tranny fluid running through my radiator, and I have a four core radiator.

Lippyp · 09-23-2009, 11:57 AM

Its an auto, not sure on the rad thickness, I'm guessing two or three core, probably whatever would have come with the original straight six. Its only a weekend toy now so won't get driven much or worked too hard but if I'm gonna do it I may as well to do it right.

**Classic Heartbeat** · 09-23-2009, 01:00 PM

1, 18" fan will keep you cool. The largest fans that you can run duel is 12". There just isn't enough space for anything larger. WES

84_4x4 · 09-23-2009, 08:35 PM

im running a single 17" and it covers from top to bottom and keeps it plenty cool

67chevemall · 09-25-2009, 01:16 PM

I have a single 18" from Summit Racing that works great.

Lippyp · 09-27-2009, 11:35 AM

Thanks guys. Can anyone tell me off hand what size the inside diameter of the bottom radiator hose is as I'm hoping to fit an elecronic fan controller in there. Also owuld 16g aluminium sheet (well it would be 1.5mm so slightly thicker) be thick enough for a shroud? I inted to make my own along the lines of Classic Heartbeats shrouds (sorry Wes, can't justify the shipping costs at the moment or I'd have bought one of yours!)

09-23-2009, 07:43 AM	#1
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Electric fan size What is the largest size dual fans you can fit on a standard radiator? I have a line on some cheap oem electric fans but they are about 18" diameter including the guard/housing etc. Wil I be able to get two on if I stagger them up and down slightly or are they just too big? I guess I should go and measure the rad but its raining and it means wrestling my truck cover off too. __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

09-23-2009, 08:10 AM	#2
rwolf9653 more ideas than money Join Date: Dec 2008 Location: spring grove, pa Posts: 1,068	Re: Electric fan size I think that two 18" fans would be too big to be set up on the same side. You could set one on the inside as a puller and another on the outside as a pusher. __________________ Randy 1948 Chevy 3100 5 window 1966 Chevy C30 Dually 1967 Chevy K10 1972 Chevy K20 1972 Chevy C10 1972 Chevy K5 Blazer 1987 Chevy V10 2003 Chevy Suburban

09-23-2009, 08:45 AM	#3
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Re: Electric fan size Would one 18" fan be enough to cool a mild 350 with a decent shroud? At the moment it has a fairly small electric fan bodged on in one corner by the previous owner and to be fair its never overheated and as its on a manula switch I only really need to put it on in heavy traffic. __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

09-23-2009, 11:57 AM	#5
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Re: Electric fan size Its an auto, not sure on the rad thickness, I'm guessing two or three core, probably whatever would have come with the original straight six. Its only a weekend toy now so won't get driven much or worked too hard but if I'm gonna do it I may as well to do it right. __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

09-23-2009, 01:00 PM	#6
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: Electric fan size 1, 18" fan will keep you cool. The largest fans that you can run duel is 12". There just isn't enough space for anything larger. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

09-23-2009, 08:35 PM	#7
84_4x4 Registered User Join Date: Oct 2006 Location: Louisville Ky Posts: 179	Re: Electric fan size im running a single 17" and it covers from top to bottom and keeps it plenty cool __________________ 1971 c10 350ci long bed fleet side

09-25-2009, 01:16 PM	#8
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: Electric fan size I have a single 18" from Summit Racing that works great. __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

09-27-2009, 11:35 AM	#9
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Re: Electric fan size Thanks guys. Can anyone tell me off hand what size the inside diameter of the bottom radiator hose is as I'm hoping to fit an elecronic fan controller in there. Also owuld 16g aluminium sheet (well it would be 1.5mm so slightly thicker) be thick enough for a shroud? I inted to make my own along the lines of Classic Heartbeats shrouds (sorry Wes, can't justify the shipping costs at the moment or I'd have bought one of yours!) __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

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