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Rad Cap Preference


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#1 croc7

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Posted 29 October 2019 - 05:52 AM

Street car, 1360, 10.5:1 compression. Currently running a 13# cap. Would the mini cooling system like a 15# rad cap?

#2 unburntfuelinthemorning

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Posted 29 October 2019 - 06:59 AM

As standard, in the British market at least, I believe the 13lb caps were used when a 180oF thermostat was used and a 15lb cap when a 190oF 'stat was used.



#3 mini13

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Posted 29 October 2019 - 09:13 AM

realistically its not going to gain you anything, all it does is push the boiling point up a few degrees, using an onlin calculateor i get the below results for the boiling points

 

13lb cap   118deg c

15lb cap   120deg c



#4 nicklouse

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Posted 29 October 2019 - 09:14 AM

only ever used a 13LBs cap. never needed anything else.



#5 Retroman

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Posted 29 October 2019 - 02:29 PM

What thermostat are you running ?

 

Is heat a problem?



#6 gazza82

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Posted 29 October 2019 - 02:57 PM

One problem is usually the length of the rad cap .. some are shorter and therefore don't seal properly .. meaning you lose your coolant when it heats up.



#7 cooperd70

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Posted 30 October 2019 - 02:57 PM

Std up to '74 13lb cap and from '74 onwards 15lb cap. Thermostat was 82c up until '76 and 88c after in the UK.

#8 croc7

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Posted 31 October 2019 - 07:48 PM

What thermostat are you running ?

 

Is heat a problem?

180 degree.  No problem with heat, just curious is all.






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