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Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

Re: Cooling article........ Posted by: BlownMGB-V8 Date: September 03, 2013 10:54AM A good starting point but it did not address coolant flow and that's a big issue in a car that might have the radiator partially above the coolant jacket in the heads. That problem is one that particularly does apply to us. Jim

Scott68B Scott Costanzo Columbus, Ohio (562 posts) Registered: 10/25/2007 11:30AM Main British Car: 1968 MGB GM 5.3 LS4 V8

Re: Cooling article........ Posted by: Scott68B Date: September 03, 2013 12:45PM This is the best article on cooling I've run across. It's slanted toward the LS motor but I think it applies to all. [www.pirate4x4.com]

Jim Stabe Jim Stabe San Diego, Ca (829 posts) Registered: 02/28/2009 10:01AM Main British Car: 1966 MGB Roadster 350 LT1 Chevy

Re: Cooling article........ Posted by: Jim Stabe Date: September 03, 2013 10:08PM I agree the Griffin article is probably the best out there. I referred to it a lot when designing my cooling system.

BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

Re: Cooling article........ Posted by: BlownMGB-V8 Date: September 04, 2013 02:00AM ...not that it's biased or anything... Good reference though. Jim

Moderator Curtis Jacobson Portland Oregon (4577 posts) Registered: 10/12/2007 02:16AM Main British Car: 71 MGBGT, Buick 215

Re: Cooling article........ Posted by: Moderator Date: September 04, 2013 03:59AM I smiled as I read the advice about using Spal electric fans for about the fifteenth time. Lately I've been thinking of removing two perfectly good Honda OEM electric fans after twenty-one years of reliable service. I think I might replace them with a Flex-a-lite belt-driven fan. Simple. Lightweight.

Jim Stabe Jim Stabe San Diego, Ca (829 posts) Registered: 02/28/2009 10:01AM Main British Car: 1966 MGB Roadster 350 LT1 Chevy

Re: Cooling article........ Posted by: Jim Stabe Date: September 04, 2013 06:49PM OEM's make the best electric fans - period! All you have to do is compare the wire size and you can see which has the most power. The big American OEM fans have a minumum of 10 ga and some are 8 ga so they have some serious power.The aftermarket ones have 12 ga if you are lucky and they usually provide a 30 amp relay. You have to have a BIG relay to make the OEM fans work because of the in-rush current when they start up, at least a 70 amp.

BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

Re: Cooling article........ Posted by: BlownMGB-V8 Date: September 04, 2013 07:10PM Yea, I've been thinking about that. Any leads on a plug-in for the standard bosch ice cube relay with a higher than 40A rating? Someone said the Caravan fan was exceptionally powerful. Jim

DiDueColpi Fred Key West coast - Canada (1367 posts) Registered: 05/14/2010 03:06AM Main British Car: I really thought that I'd be an action figure by now!

Re: Cooling article........ Posted by: DiDueColpi Date: September 04, 2013 09:56PM The Bosch " icecube" style relays can actually handle more than 40 amps. The problem is that the terminals can't. So you won't find a reliable direct replacement. Soldering the terminals onto the relay will buy you 55-60 amps. Or a better choice is the VW relay # 357 906 381 B. (just an example. they are available from many euro sources) It's the same size as the ice cube relay but it has bigger power terminals. It's rated at 70amps 12v continuous. Terminal blocks are available for them (with the same footprint) that directly replace the small terminal ones. Cheers Fred

BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

Re: Cooling article........ Posted by: BlownMGB-V8 Date: September 25, 2013 10:16AM Got a link?

74ls1tr6 Calvin Grannis Elk Grove,CA (1151 posts) Registered: 11/10/2007 10:05AM Main British Car: 74 TR6 / 71 MGB GT TR6/Ls1 71 MGB GT/Ls1

Re: Cooling article........ Posted by: 74ls1tr6 Date: September 27, 2013 11:16AM I bought two 83 to 86 dodge caravan fans. I hooked one up to a battery and it blew my hat right off my head before it was up to speed. I will be changing the TR6 fan over to one of these caravan fans, and running one on the GT build. They do have the shroud attached that can be cut down a little. Thanks to Tom A's research to see which one can pull up a piece of sheet medal off the ground. The cost at U-Pull-It was $42 per fan. It moves way more air than what I'm using, and yes it has some serious wire gauge going to the fan.

BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

Re: Cooling article........ Posted by: BlownMGB-V8 Date: September 27, 2013 12:09PM I have a rather generic fan Summit sells for the late model Camaro that looks a lot like the Falcon fan in the link above. Twin fans, sells new for about $140 I think. Moves lots of air. Not suitable for MGB without the wide radiator mod. Jim

BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

Re: Cooling article........ Posted by: BlownMGB-V8 Date: September 27, 2013 12:12PM Here's an oddity since we are now looking into engines such as the Toyota 1UZ and the newer Chevy engines. The 1UZ has both coolant connections near the top of the engine. I would think of that as odd enough, but apparently the connection with the thermostat housing is the water pump supply side and goes to the bottom of the radiator. Does anyone know the reasoning behind these changes? Jim

Scott68B Scott Costanzo Columbus, Ohio (562 posts) Registered: 10/25/2007 11:30AM Main British Car: 1968 MGB GM 5.3 LS4 V8

Re: Cooling article........ Posted by: Scott68B Date: September 27, 2013 03:22PM Hey Calvin, By any chance did you measure the diameter of that fan? Regards Scott

Jim Stabe Jim Stabe San Diego, Ca (829 posts) Registered: 02/28/2009 10:01AM Main British Car: 1966 MGB Roadster 350 LT1 Chevy

Re: Cooling article........ Posted by: Jim Stabe Date: September 27, 2013 05:59PM Go look at the Volvo fans also. They are single two speed fans 16-17" but they have a neat mounting ring perfect for home made shrouds. They also have a nifty relay module for running the 2 speeds

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