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RB25DET heater delete - loop or block pipes

GeeDog

By GeeDog,
in Engines & Forced Induction

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GeeDog Experienced

GeeDog

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RB25DET heater delete - loop or block pipes

Hi all, the RB25DET is currently out of my R33, but will be going back in tomorrow. I want to delete the heater pipes, but undecided whether to use a small loop of heater hose between the 2 pipes, to block the pipes off, or to loop them with a flow restriction in the loop.

The thinking is that the coolant flows through the heater core all the time (once engine is at running temp), so looping them is the best option. Then I think that the heater core provides a restriction on the coolant flow, and looking at the coolant path not having this restriction would affect flow to the oil cooler (heater) and maybe the turbo.

Has anyone researched this, or have an opinion either way? 

hardsteppa Grand Master

hardsteppa

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Posted

Coolant flowing thru heater core will not make any restrictions relevant to temp/flow across test of engine. Looping is better, blocking creates a dead-spot that collects sludge, contributes to rust& corrosion.

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