Theory on no shroud?

[Bigsyke]

So heres the scoop, temps been pretty much at 150-160*f the whole summer. Durring cruising my altima fans havent ever turned on with the factory cooling fan relay #1. Idle they will trip after 13 minutes. I blew one of the relays, and apon inspection, the fan was pretty much a POS.

Theory is, I dont drift, its a DD. Would airflow hypatheticaly be higher through the radiator without the shroud since the warm air isnt collecting behind the radiator? Or does the shroud help the cooler air pool up behind the radiator durring cruising, soaking into the radiator cooling it better? Also it would seem the shroud would do 2 things, either insulate the rad from the engine, or expose it to the engine heat.

I have cooling fan relay on a switch, so i can still toggle. Anybody run just the OE A/C electric fan? This altima fan is ripping into my radiator

Mishimoto rad
Nismo Tstat
Honda Type II coolant
Swirl tank
Cooling panels
New hoses, water pump etc.

[S14_Kouki]

a shroud helps air flow in return will help cooling

[Bigsyke]

Even when the fan isnt running? im talking about a fan shroud.

[240sxrb25]

factory put it there for a reason. but mine is broken and never ever overheat, even without a fan. idk

[Tom25666]

i wondered about this too. no real input on the matter tho. i'm running electric fans that came with my radiator

[cwd240]

definitely keep the shroud, helps direct cold air

[FaLKoN240]

The shroud directs the air around. However you're not running a clutch fan set up. So I don't really know what to tell you.

If it ain't broke don't fix it? Maybe make some spacers or something to move your fan back so it doesn't rape your radiator.

[ZX88]

ive been running no shroud for over a year highway driving, beating the shit out of it , etc never overheated. should helps airflow but i mean its not necessary.

[Bubbles]

Shroud will always be better.

May not be necessary, but it will always be better than without.

[ixfxi]

you have a very confusing post


are you talking about the lower engine cover that acts as an air guide? those help aerodynamics, but they also retain heat in the engine bay. some people say that running one is more efficient, but i personally feel the tradeoff in aero vs less heat retention and easier serviceability are more of a priority for me.

if you're talking fan shroud for the clutch fan, that can only work with the OE clutch fan. if you have electric fans, you dont necessarily need a shroud although they can help.

btw, why are you complaining? 150-160 is bare minimum in terms of engine heat. nominal operating temp is 190.

i would just look into securing your e-fan(s) properly.

[xpertsnowcarver]

Jesus... 150-160 over the summer? That's outstanding.

Nothing else to add. ixfxi was thorough with his answer.

I'm using a Koyo rad, Nismo Cap, Nismo thermo, 89-90 240 ac fan in front (controlled by ecu), and 91-94 ac fan behind (controlled by switch). Works great. Using Redline Water Wetter. No clutch fan or shroud.

[chibo]

I live in Arizona, it's hot as fuck here. SRs overheat here without shrouds or a very well ducted efan setup. Do the math.

[kalypso123]

shroud is for clutch fans... dual electrics dont benefit.

ducting is always a plus tho

[Slip&Sliden 240]

On my SR Im running a Koyo with one pusher fan. The fan is on a sohc thermo switch in the lower rad hose. In the winter the it runs 160*F in the summer it runs 190*F.

[chrisa]

you have a very confusing post


are you talking about the lower engine cover that acts as an air guide? those help aerodynamics, but they also retain heat in the engine bay. some people say that running one is more efficient, but i personally feel the tradeoff in aero vs less heat retention and easier serviceability are more of a priority for me.

if you're talking fan shroud for the clutch fan, that can only work with the OE clutch fan. if you have electric fans, you dont necessarily need a shroud although they can help.

btw, why are you complaining? 150-160 is bare minimum in terms of engine heat. nominal operating temp is 190.

i would just look into securing your e-fan(s) properly.
Listen to this guy, he said it all. This guy knows what he is talking about.

[!Zar!]

you have a very confusing post


are you talking about the lower engine cover that acts as an air guide? those help aerodynamics, but they also retain heat in the engine bay. some people say that running one is more efficient, but i personally feel the tradeoff in aero vs less heat retention and easier serviceability are more of a priority for me.

if you're talking fan shroud for the clutch fan, that can only work with the OE clutch fan. if you have electric fans, you dont necessarily need a shroud although they can help.

btw, why are you complaining? 150-160 is bare minimum in terms of engine heat. nominal operating temp is 190.

i would just look into securing your e-fan(s) properly.

Removing the bottom one disrupts airflow throughout the engine bay. Which in turn wouldn't allow air to enter and exit the engine bay fluidly.

I know on an FC engine temps rise once the lower cover is removed. Of course a part of it most likely has to do with it being a vmount setup from the factory.

Of course it could also be argued that the decrease in aero dynamics isn't worth the hypothetical engine temp drop due to the engine working harder.

As said earlier, why try and reinvent the wheel?

If you're talking about the fan shroud, leave that on. It's much more efficient then any other setup.

[S14_Kouki]

Fuck fans ahahahahahah I drove my SR with NO fan from PA to FL and for close to a year without a fan. My temp never went above 180 degrees my rad is a koyo.

[chrisa]

^^^ Im sorry but that was so stupid. I hope you get caught in a traffic jam then we'll see where your temp is.

[zenki.life]

^^^ Im sorry but that was so stupid. I hope you get caught in a traffic jam then we'll see where your temp is.

+1 i was thinking along the same lines. haha

[Bigsyke]

I was talking about the electric fan shroud. I would like to remove my altima fans and go back to just the OE A/C fan that has no shroud. I still have the undertray cover, but I removed the clutch fan shroud/setup.

What I was thinking was if the extra resistance of having 2 fans + a shroud will affect airflow through the radiator when the fans are OFF, in a positive or negative way.

Im probably going to try and redo the wiring to see if I cant clean the altima fans harness up a bit, since the whole setup is so ugly.

[!Zar!]

Fuck fans ahahahahahah I drove my SR with NO fan from PA to FL and for close to a year without a fan. My temp never went above 180 degrees my rad is a koyo.

And?

That's like saying you ran around having random unprotected sex and you managed to not catch anything.

There isn't anything cool about saying, "fuck fans".

If fact, it's stupid. But I'm not saying you're stupid or anything.

I'm just saying not running fans is stupid. ;)

[xpertsnowcarver]

That's like saying you ran around having random unprotected sex and you managed to not catch anything.

Lol.. Good simile/metaphor.

[Ceepo]

go to vatozone and get some electic fans wire them up to a temp switch or hard wire them to a switch in the car and turn them on as needed... i have heard that the factory fan shroud and fan are the best at cooling(the mechanical waterpump driven ones) but i have not had anyone clarify that...

[Matej]

Sorry to go off topic, but would anyone on here happen to know how much air the stock a/c fan flows, as in CFM? Just curious.

[Walperstyle]

^lol are you serious?

[articdragon192]

Seems like it. Some people use AC electric fans as their only fan. My buddy runs that fan on his V-Mount set up on his rad and hasn't had any problems, so it seems like a viable option.

[Matej]

Yes. Actually, I have been running it until now, but I would like to switch to a pusher fan. I know pusher fans are not exactly the most efficient setup, that is why I am curious how much the stock a/c fan flows, so I can make sure to at least get a pusher fan significantly stronger than that.
The reason I want to do it is mainly for the sake of tucking the engine bay. I know that may sound silly, but I do not track my car or anything like that, so I think as long as I get a strong enough fan it should be fine.

[Bigsyke]

I would like to compare one of the motors of my altimafans to the AC fan and see if they are the same motor. I know the shroud would assist with a higher positive CFM, but motors I think are the similar.