Radiator cap for Koyo's FC radiator

Pete_89T2 · 02-09-2011, 03:31 PM

I just ordered a Koyo AL radiator, Koyo part # R1144N, which fits the series 5 FC's, but I forgot all about the radiator cap... Does anyone know for sure if the stock cap will fit this radiator?

If not, Koyo makes a cap for this radiator, but it's a higher pressure cap than stock - 1.3 vs. 0.9 bar, IIRC. I realize that a higher pressure cap is good from the standpoint of raising the coolant's boilover temp, but was a little concerned the additional pressure might not be good for seals in a rotary or could make leaks more likely -- is this a valid concern?

02-09-2011, 03:31 PM	#1
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	Radiator cap for Koyo's FC radiator I just ordered a Koyo AL radiator, Koyo part # R1144N, which fits the series 5 FC's, but I forgot all about the radiator cap... Does anyone know for sure if the stock cap will fit this radiator? If not, Koyo makes a cap for this radiator, but it's a higher pressure cap than stock - 1.3 vs. 0.9 bar, IIRC. I realize that a higher pressure cap is good from the standpoint of raising the coolant's boilover temp, but was a little concerned the additional pressure might not be good for seals in a rotary or could make leaks more likely -- is this a valid concern?

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