Once you have the air bled out of the cooling system would it be common for "new air" to accumulate in the top of the radiator? Larry - Cleveland -----Original Message----- From: DeTomaso [mailto:detomaso-bounces@server.detomasolist.com] On Behalf Of Richard Greenblum Sent: Thursday, September 22, 2016 4:52 PM To: detomaso@server.detomasolist.com Subject: Re: [DeTomaso] Top of radiator connected to swirl tank (It doesn't go to the swirl tank) My stupid guess is that it works, if at all, when the system is cool and pressures have subsided. The top of the radiator is lower than the tank, so perhaps the air trapped at the top of the radiator after a heat cycle travels to the tank. Either that, or the speed of the water in the tank while the engine is running creates enough suction that it scavenges the air (and some water) from the top of the radiator. If I recall correctly, when I installed my aluminum radiator from PPC 15 or more years ago, Dennis told me not to worry about that line, it didn¹t do anything anyway. I¹ve followed the raising and bleeding procedures since with no water temp problems (except for erratic gauge readings at times) but no actual overheating. Richard Austin, TX From: DeTomaso <detomaso-bounces@server.detomasolist.com> on behalf of "Joseph F. Byrd, Jr." <byrdjf@embarqmail.com> Date: Thursday, September 22, 2016 at 15:18 To: 'Guido deTomaso' <guido_detomaso@prodigy.net>, 'Chuck and Linda Huber' <lindahuber@cox.net>, <detomaso@server.detomasolist.com> Subject: Re: [DeTomaso] Top of radiator connected to swirl tank (It doesn't go to the swirl tank) I am being serious this post... I couldn't see the pics, but you confirmed how I thought Chuck had plumbed his tanks. I agree that way provides active deaeration and it will be one of the few modifications I plan to include. Joe -----Original Message----- From: DeTomaso [mailto:detomaso-bounces@server.detomasolist.com] On Behalf Of Guido deTomaso Sent: Thursday, September 22, 2016 15:59 PM To: Chuck and Linda Huber; detomaso@server.detomasolist.com Subject: Re: [DeTomaso] Top of radiator connected to swirl tank (It doesn't go to the swirl tank) This (below) is a genius modification, creating a true active deaeration system using suction from the water pump to continuously flow water through the expansion tank, drawing air from the high points in the system. But how common, how many have built a system like this ? The TSB modification, which some here ( Tomas? ) have confirmed was likely incorporated at the factory, connects the relatively high-pressure swirl tank to the lower-pressure radiator, so I conclude while the engine is running, nothing is going to flow from the radiator to the swirl tank, it's not going to actively de-aerate. Initial fill, I can see it helping. After that, I'm scratching my head. Thanks, GD From: Chuck and Linda Huber <lindahuber@cox.net> To: detomaso@server.detomasolist.com Sent: Thursday, September 22, 2016 7:27 AM Subject: Re: [DeTomaso] Top of radiator connected to swirl tank (It doesn't go to the swirl tank) There is definitely a mod that sucks air from both the swirl tank, and the top of the radiator into the expansion tank. The expansion tank is under suction, and this causes any trapped air to bleed to the expansion tank. I did this on my car. I believe that it does its job, especially of removing any trapped air from the radiator. I had to run a new, separate metal hard line down the length of the car from near the front of the radiator, all the way back up the bulkhead past the electrics panel, to near the expansion tank. Here are pictures of my tanks with the appropriate bleed fittings installed. Chuck I think Joe was just joking - His Coriolis post confused me... -----Original Message----- From: Owen Cooke [mailto:owen@tadhgcooke.com] Sent: Thursday, September 22, 2016 5:45 AM To: Julian Kift; Guido deTomaso; detomaso@server.detomasolist.com Subject: Re: [DeTomaso] Top of radiator connected to swirl tank, was Re: DeTomaso Digest, Vol 147, Issue 19 Julian yes you could be right i need to check it all again owen cooke
On 21/09/2016 22:37, Guido deTomaso wrote:
"but my car had bleed pipe from the rad back to the swirl tank"
I'm kinda fascinated by this mod, which I believe is in the TSB's, connecting the top of the radiator to the swirl tank with a long hose. Not sure how it works or what it was supposed to do.
With a completely dry system, I can visualise how it would allow the radiator to fill completely, as air formerly trapped in the top of the radiator would have a path back to the swirl tank, a higher point.
But once the engine is started, water or air is going to move from the swirl tank to the radiator, because of pressure difference. Not sure this is helpful but maybe isn't harmful.
Most difficult to visualize, if the engine is off and there is air in the radiator, can the weight / head / row gee aych of the water in the swirl tank push the air into the swirl tank ? Is there some Archimedes rule I'm not seeing here ?
Also did any cars come from the factory this way, was there an official path and mounting systems for the hose ? Cable ties ?
Thanks,
Guy D.
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