[DeTomaso] DeTomaso Digest, Vol 46, Issue 9- Oil Cooler

Sat May 10 17:10:38 EDT 2008

I thought that the C&R and Fluidyne oil to water heat exchanges both have a coil in a chamber, but I think the oil is circulated through the coil and the water flows through the chamber.  It seems like the same coil inside a dry sump tank would have about the same result.  Might have to take the oil inlet or outlet into the tank into consideration to make sure the oil was moving over the coils.  Ultimately, it's just surface area and temperature gradient.

  I like the idea of less plumbing and maybe saving a little space.

  Ken

Tomas Gunnarsson <guson at home.se> wrote:
  A simple coil in the dry sump tank would not be very effective. For efficient heat transfer you need a large contact area and/or a high difference in temperature between the cooled and cooling media. The Laminova has a very large contact area against the oil due to its internal design but if the water cooling the oil is very hot the cooling efficiency drops dramatically.

Tomas

----- Original Message ----- 
From: "Ken Green" 
To: "Curt Hall" ; "John Taphorn" ; "Julian Kift" ; ; ; 
Sent: Saturday, May 10, 2008 10:23 PM
Subject: Re: [DeTomaso] DeTomaso Digest, Vol 46, Issue 9- Oil Cooler

>I think at least some Nascar guys use C&R oil to water oil coolers. I think they are all dry sump, and it seems like that would change some things because the oil is held in a tank not attached to the engine. It seems like it would be obvious to circulate water through a coil submerged in the dry sump tank to obtain oil to water heat transfer, but I've never seen that???
> 
> Ken
> 
> Curt Hall wrote:
> What do the Nascar guys use? They are up in the high RPM's most of the race? 
> 
> John Taphorn wrote: Julian
> 
> I had the opportunity to be a small part of a conversation with Bob in the 
> Hospitality Suite at Vegas regarding his high oil temp dilemma.
> 
> My positive experience with the Laminova cooler is based on keeping revs at 
> or under 6000RPM. Bob commented that at those relatively lazy RPMs he has 
> no oil temp problems at all with the Water to oil style coolers.
> 
> However, the situation changes when he uses his 6800 RPM shift point. It is 
> at this level the water to oil cooler alone has been unable to keep his high 
> temps at bay.
> 
> JT
> ----- Original Message ----- 
> From: "Julian Kift" 
> To: ; ; 
> Sent: Saturday, May 10, 2008 10:21 AM
> Subject: Re: [DeTomaso] DeTomaso Digest, Vol 46, Issue 9- Oil Cooler
> 
> 
>>
>> Bob,
>>
>> It sounds like you've already experimented a lot, but most other people 
>> have had best success with the water-oil (laminova style) coolers, so the 
>> question is what is the underlying problem here?
>>
>> What is your water temperature? My oil temp stays at a pretty constant 35 
>> degrees above water temperature and I've heard similar deltas from others. 
>> a) Are you sure the readout you get from your oil temp gauge is a true 
>> temp? (I've seen mismatched senders and gauges i.e. a 280 degree sender 
>> rigged to 300 degree gauge, so full scale deflection when oil reaches 280 
>> tells you 300 on the gauge!) b) is your oil temp sender in the oil pan or 
>> in the block? I've heard of 40 degree higher temps if its measuring in the 
>> block.
>>
>> I'd be tempted to do a little more up front investigation and physically 
>> measure oil temp prior to spending more $$.
>>
>> Tomas: Now that is a bright idea and as you say can be done using off the 
>> shelf dry sump parts.
>>
>> Julian
>>
>>>> After my recent run at the Vegas Track event>> I have decided that the 
>>>> only way I can cool my>> oil down below 300 running at 6800 on most of>> 
>>>> the corners is to put a air to oil cooler up front >> as Charlie Puckett 
>>>> told me to do several years ago>> He and I have tried other locations, 
>>>> oil to water, fans>> etc... I give up so up front we go or I am going 
>>>> to>> eventually roast my motor.>> >> I think 5/8 hard lines under the 
>>>> car but as most>> have told me I will need to pump that far... I will>> 
>>>> leave the stat in the filter adapter and the only>> time I really need 
>>>> to use the cooler is when we>> track the car... put ithe pump on a 
>>>> switch would be best>> (electric).... now who... what size.... 
>>>> pressure???>> any thoughts???? maybe off the new vette, ford gt???>> >> 
>>>> Bob Benson
>>>Tomas Gunnarsson had what I think is a great idea. >Instead of running the 
>>>oil at full pressure to the front and back, >install a separate low 
>>>pressure oil pump and just circulate the oil >from the oilpan to the 
>>>cooler and back into the pan. >You could drive the oilpump from one of the 
>>>driveshaft flanges. I >guess a single stage drysump pump and a gilmer belt 
>>>drive would >work. Thomas
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