Engine and Transmission Tech
tips, technology, tools and techniques related to vehicle driveline components
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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: Rad cap mounted temp switch
Slight problem. The crossflow radiators have the fill neck on the suction side. (Of course dummy.) This doesn't work at all. Too bad though, it seemed like a clean solution. Maybe with a much cooler switch point.
Might work with a downflow but only if the fluid can be kept in contact with the bulb. Well, thanks for the assist guys. Fun, if not successful. Jim |
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ex-tyke Graham Creswick Chatham, Ontario, Canada (1165 posts) Registered: 10/25/2007 11:17AM Main British Car: 1976 MGB Ford 302 |
Re: Rad cap mounted temp switch
Seems to me that late model MGB's had the fan sensor stuck in a hole in the upper tank (forward face) and retained with a wire clip. If you're going the soldered bung route, why not solder it into the pressure side end tank, similar to original. Your fan switch needn't be so long and more available, then.
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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: Rad cap mounted temp switch
Yes, it is flat on the end and with some heat sink paste could simply be clamped to the tank. I will give it some thought. Maybe a fairly simple "C" shaped clip with a threaded hole and screw in the sensor as the clamp. Could be a good idea. Make it out of about 10 ga. aluminum maybe.
Jim |
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MGBV8 Carl Floyd Kingsport, TN (4512 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Rad cap mounted temp switch
I have one like Ivor posted tied to my OEM electric fans with the probe stuck way up into the upper hose. This is as a backup to my engine fan.
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302GT Larry Shimp (241 posts) Registered: 11/17/2007 01:13PM Main British Car: 1968 MGB GT Ford 302 crate engine |
Re: Rad cap mounted temp switch
I have a temperature switch that is on a probe that fits into the radiator fins (air space) not water space.core. It is about 1/3 down from the top and works just as intended. It is easy to experiment by inserting it in different parts of the radiator...
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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: Rad cap mounted temp switch
Here's my next attempt:
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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: Rad cap mounted temp switch
Had to trim the bracket a little to fit it through the radiator mounting frame.
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88v8 Ivor Duarte Gloucestershire UK (1041 posts) Registered: 02/11/2010 04:29AM Main British Car: 1974 Land Rover Lightweight V8 |
Re: Rad cap mounted temp switch
You might want to put some heat paste on the sensor where it contacts the rad, make sure it picks up the temp.
[www.amazon.com] Ivor |
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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: Rad cap mounted temp switch
Yeah, I did that but thanks. I need to go back and short the leads to make sure the fans activate. They should but I'm still not getting the right results. More later.
Jim |
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DiDueColpi Fred Key West coast - Canada (1365 posts) Registered: 05/14/2010 03:06AM Main British Car: I really thought that I'd be an action figure by now! |
Re: Rad cap mounted temp switch
Have you checked it out with an infrared heat gun Jim?
Probably the easiest way to home in on the sweet spot. The heat loss around the sensor might be too much as well. Might need some sort of insulation to function correctly. Cheers Fred |
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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: Rad cap mounted temp switch
Turns out the switch was the wrong spec. I'll need to find one that turns on at about 185 and 195F. I think it's a 22 x 1.5mm thread.
Jim |
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DiDueColpi Fred Key West coast - Canada (1365 posts) Registered: 05/14/2010 03:06AM Main British Car: I really thought that I'd be an action figure by now! |
Re: Rad cap mounted temp switch
You need the early VW Audi rad fan switch Jim.
Dual range, 95/84 - 102/91 degree C, on /off temps. 22 by 1.5mm thread. Will run a 450 watt fan without a relay but I always put one in anyway. Part # 321 459 481A Cheers Fred |
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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: Rad cap mounted temp switch
Thanks Fred (just sent you a PM btw)
If I could get one just a little cooler than that I think i'd like it better. Jim |
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