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Today at Atelier Kaz - Private NSX Enthusiast, ex-Honda R&D engineer with F1, Indy/CART background

Rear bank water guard

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Have been using this for quite some time now and already applied it for some of the owners so thought about sharing the method.

Please note that this is just better than doing nothing and not a perfect solution.
If you need something for permanent fix, please consider using the protector fabricated by our member 'britlude' (Jonathan).


The purpose of this application is to reduce the amount of water dripping over the rear bank valve cover
while the car is parked outside.
It is known to cause extra corrosion at the IG coils or spark plugs if the rubber seal at the IG coil cover is already tired or not installed properly.



I'm not that worried with the water dripping over the rear bank while the engine is running or when the car is moving at speed.



All you need is some sort of thick foam tape or similar that can act as a guard.
The adhesive needs withstand the moderate heat from the eng bay.
I used the Stormguard Jumbo tape (about 20mm width and 11mm height/thickness) but anything similar can be used.

You don't need removing the long black plastic eng bay vent cover but if you do, you'll have better access.














Addition to the tape, I blocked off one of the hole on the vent here using thin EPDM foam but it will cause extra puddle (as described next) so not sure it's better leaving open or not.


It's concealed so you can't see it from outside unless you open the rear glass hatch and look under the vent cover.


















As mentioned at the beginning, this is far from perfect solution.

The water from the rear hatch glass will run down towards the vent cover and it will create lots of puddles.
The vent cover is almost horizontal so unless you parked the car with specific inclination, sooner or later,
the puddle will overflow beyond the tiny lip (probably just about a few mm height) of the vent cover and land on the rear valve cover.

















However, the water entering through the vent will be blocked by the guard and with the shape of the frame,
it will be drained close to the RR damper top mount and towards the side of the engine so
it will reduce the amount of water splashed over the rear bank while the car is parked outside.



Even without this, if you keep your IG coil cover seal healthy, you won't have problem with the IG coil or the spark plug
(my NSX is driven even in the wet and I'm still using the original IG coil covering more than 154K miles over the last 23 years)
but should help in reducing the amount of water splashed over the rear bank.



Kaz



Comments

  1. solidol's Avatar
    Hi Kaz, thanks for sharing. I've been using half an inch tall weatherstrip routed like you have described for few years now. Instead of blocking off vent hole what I did was put small piece of weatherstrip on the shock tower to route water coming in from that vent hole away from the rear bank. I also always apply dialectic high temp grease on the coils mating surface. It's been holding great so far (granted I rarely drive in the rain or parked outside for long when it's raining)