Rimmer's 4-row radiator

[mole42]

Has anyone tried one of the Rimmer Bros 4-row radiators? They are on offer right now and it's quite a good price.

Richard

[flying farmer]

I bought one for my first Stag when I was experimenting with removing the viscous fan and relying only on an electric fan.

What I found was the temperature would not stay down with ram effect only so I bought the Rimmers 4 row in the hope it would make a difference. Since the exchange deposit was only about £30 I didn't send the old one back as it looked as good as new.

As far as I could tell it made absolutely no difference whatsoever!

I then fitted a TR6 front spoiler and solved the temperature stability problem.

Fast forward a couple of years and I needed a radiator for my project Stag so I dusted down the original 3 row and fitted it with the TR6 spoiler and only an electric fan. So far it has coped with the full 246 bhp on a hot track day (which is more than the brakes did)! and climbing mountains in Southern France in 30 degree temperatures while loaded down with piles of paragliding kit.

It might be significant but the Rimmers 4 row core are not staggered rows, all 4 are in a line. Makes it easy to fit the thermostat for the fan which pushes into the radiator core, but the staggered 4 row design is supposedly more efficient. It just so happens the standard radiator on my TR is a staggered 4 row design which is the same size as a Stag radiator but vertical flow rather than horizontal.
This also cools very well, but only after I fitted a TR6 spoiler!
I have a suspicion that the extra core thickness actually reduces the airflow and this is why it doesn't seem to improve the cooling.

Neil