Re: [Chrysler300] Radiator Re-core, Additional Rows

["Charlie Valentine" <cross.ram@xxxxxxxxxxx>]

Pressure caps !!! 
While I am no expert on the matter of pressure caps Someone once told me that : In In a  cooling system, a higher pressure equates to a higher boiling point for the coolant. Higher coolant pressures also transfer heat from the cylinder heads more efficiently. We recommend using a radiator cap with the highest pressure rating that the radiator is designed to accept. In general, performance radiators will accept 22-24 PSI, and professional racing radiators will accept a 29-31 PSI.

The coolant will typically only build to 16-18 PSI, due to expansion up to 200°F. However, if the engine does overheat due to external factors, the pressure inside the cooling system could reach as high as 28 PSI. Once the radiator cap has opened and vented coolant, the engine will not cool down until it has been turned off. The radiator cap is basically a "safety valve", so always use the highest pressure radiator cap that the radiator will tolerate. If you are unsure of the pressure rating for your radiator, check with the manufacturer for the maximum recommended operating pressure.

So, putting a lower pressure cap will decrease the boiling point and could cause overheating problems.

Lion Charlie Valentine
300G, 1962 300 Sport Convertible


  ----- Original Message ----- 
  From: Mark Lindahl 
  To: chrysler300@xxxxxxxxxxxxxxx ; Knutsen, Mark C 
  Sent: Friday, August 29, 2008 4:27 PM
  Subject: Re: [Chrysler300] Radiator Re-core, Additional Rows


  Hi Mark,

  I had my stock radiator recored and the guy suggested to add rows to the max capacity.
  When he did this, it actually made the radiator a little thicker and it never overheated.
  That company is now gone, but one that I know does repairs is listed below. Give them a call.

  Lake Zurich Radiator & Air Conditioning
  785 Oakwood Rd 
  Lake Zurich, IL 60047 Map

  a.. (847) 438-4334 
  There was a small leak between the top tank and they were able to repair it after the original company went out of business.
  One thing he told me was that it is a good idea to slightly reduce the radiator cap pressure for some of these old radiators.
  He said the stock cap (14PSI ?) may actually cause the top tank to separate under high pressure/heat and he felt that the stock cap pressure was really not necessary. 

  I would be interested in knowing any comments on this. I still have the stock cap on there with no problems now.

  Regards,
  Mark Lindahl
  '63 300 Conv.

  ----- Original Message ----- 
  From: Knutsen, Mark C 
  To: chrysler300@xxxxxxxxxxxxxxx 
  Sent: Friday, August 29, 2008 2:57 PM
  Subject: [Chrysler300] Radiator Re-core, Additional Rows

  Any suggestions on radiator shops in the Chicago/Rockford Area for a
  rebuild on a 1961 G?

  Also, any thoughts on adding an additional row of cooling tubes to the
  stock radiator? It was recommended to me by some of the local mechanics
  but curious if anyone has tried it yet.

  Thanks in advance

  Mark Knutsen

  300 G.

  <http://geo.yahoo.com/serv?s=97359714/grpId=3732744/grpspId=1706713852/m
  sgId=23179/stime=1216714814/nc1=4430620/nc2=4507179/nc3=4836044> 

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