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Old 07-13-2013, 07:54 AM
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Grill inserts - effects of reduced windflow?

I've seen a lot of threads about grill inserts, both DIY and the purchased goods. And I agree they look fantastic, but has anybody have any information on how much they reduce airflow through the grill?

I know its kinda an extreme case, but I don't want to make my cooling system work overtime for a little bit of bling. Or have something without a temp gauge like my trans overheat.

On a related note has anyone noticed a difference in mileage? Considering the Wrangler has the aerodynamic profile of a brick I would be surprised if a little mesh mattered, but I am curious.
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Old 07-13-2013, 08:02 AM   #2
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I would not worry about reduced airflow at all. If you were able to hook one of those inserts up to a flow bench I doubt you could measure ANY difference with or without it. It is mesh after all.

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Old 07-13-2013, 08:13 AM   #3
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My TJ ran at 210 before my home made inserts and runs at 210 after home made inserts.
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Old 07-13-2013, 08:26 AM   #4
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It's been a non-issue for me and mine is I think more restrictive than most mesh ones.
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Old 07-13-2013, 08:41 AM   #5
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It's a non issue. For the most part, every other vehicle manufactured has a grill insert/covering of some sort for protection. It actually should be installed from the factory, but I guess it keeps the cost down. It's probably one of the best mods you can do for protection and appearance. There is no affect on cooling. In fact, it can only increase cooling efficiency by keeping foreign material out of the cooling vents of the radiator. Plus, it will deflect any road hazard from damaging the radiator.
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Old 07-13-2013, 09:37 AM
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Thanks for the responses and the information everyone!
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Old 07-13-2013, 10:15 AM   #7
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It's a non issue. For the most part, every other vehicle manufactured has a grill insert/covering of some sort for protection. It actually should be installed from the factory, but I guess it keeps the cost down. It's probably one of the best mods you can do for protection and appearance. There is no affect on cooling. In fact, it can only increase cooling efficiency by keeping foreign material out of the cooling vents of the radiator. Plus, it will deflect any road hazard from damaging the radiator.
This! I made my own. Not for looks, but to protect the cores from damage. Getting rocks, twigs, bugs, & the like in there isn't good. Sure,i will still get smaller bugs in there, but alot of stuff wil stay out.
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Old 07-13-2013, 11:16 AM   #8
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Quote:
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This! I made my own. Not for looks, but to protect the cores from damage. Getting rocks, twigs, bugs, & the like in there isn't good. Sure,i will still get smaller bugs in there, but alot of stuff wil stay out.
We lined the inside of our grill insert with a piece of window screening. Lets the air in, keeps the bugs out!
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Old 09-07-2013, 12:53 AM   #9
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Originally Posted by Raiderfan001 View Post
It's been a non-issue for me and mine is I think more restrictive than most mesh ones.
Did you make your grill insert yourself?
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Old 09-07-2013, 06:28 AM   #10
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I would be more concerned about reduced rock flow.

The jk is the only vehicle on the market that i am aware of with no radiator rock flow reduction device. I also own a truck with a 12 liter turbodiesel engine which came with a rock flow reduction device from the factory. And i think that 12 liter needs all the airflow it can when its pulling an 80,000 lb truck up a mountain
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Old 09-07-2013, 03:01 PM   #11
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I've seen some vehicles that are wide open in the front with no grills, the same as our jeeps. It's really sad that they are like that. I want protection for my radiator units.

On the more air flow. You can always put fans on the outer side to blow & the inner ones will suck. Extra cooling!


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I would be more concerned about reduced rock flow.

The jk is the only vehicle on the market that i am aware of with no radiator rock flow reduction device. I also own a truck with a 12 liter turbodiesel engine which came with a rock flow reduction device from the factory. And i think that 12 liter needs all the airflow it can when its pulling an 80,000 lb truck up a mountain
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Old 09-08-2013, 07:30 AM   #12
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Quote:
Originally Posted by Raziel View Post
I've seen some vehicles that are wide open in the front with no grills, the same as our jeeps. It's really sad that they are like that. I want protection for my radiator units.

On the more air flow. You can always put fans on the outer side to blow & the inner ones will suck. Extra cooling!
You dont need that. You have one hell of a fan from the factory.

If you want to improve cooling get an aftermarket transmission cooler.

Even my hyundai has a mesh there. Seriously, the cheapest crappiest sounding brand name. Seriously, the door panels are just hard plastic.
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Old 09-08-2013, 06:35 PM   #13
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I have the RR ones and love them, and good looking also. No air flow problems at all. Easy to install too.

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Old 09-08-2013, 06:41 PM   #14
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Any tj's have pics of a mesh grille?
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Old 09-08-2013, 06:52 PM   #15
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I have the RR ones and love them, and good looking also. No air flow problems at all. Easy to install too.

Just installed the exact same ones on mine this weekend!
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Old 09-08-2013, 07:12 PM   #16
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Wish I would have put these inserts on mine. I drove through a nasty hail storm the other day and really banged up my radiator.
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Old 03-13-2017, 09:21 PM   #17
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Manufacturer of behind the grille mesh inserts told me industry standard reduction in airflow to engine was 22%, including their own, but that it still should not cause any over heating.
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Old 03-13-2017, 10:45 PM   #18
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Not to pick nits, but you guys do know that what you see through the grill is not your radiator, right?

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Old 03-14-2017, 10:36 AM   #19
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Not to pick nits, but you guys do know that what you see through the grill is not your radiator, right?

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Yes, the condenser is mounted in front of the radiator.
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Old 03-14-2017, 10:43 AM   #20
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That's the AC condensor. The radiator is behind it. Auto's have a tranny cooler that sits in front of the condensor, and covers the top third of of it.

BTW, you can buy a cooling fine comb at HF or most auto parts stores that'll let you straighten those condenser fins.

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Old 03-14-2017, 10:51 AM   #21
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I would not worry about reduced airflow at all. If you were able to hook one of those inserts up to a flow bench I doubt you could measure ANY difference with or without it. It is mesh after all.
Ummm....I would like to note that while I think MOST of the grille inserts we see have a large % of opening, I have seen some that appear to be 50% or so closed (and therefore only 50% open), so while it is still "mesh", to say that it won't have "ANY difference" is just inaccurate....

Will it make the engine overheat or cause performance issues? Perhaps not, but a tight mesh WILL have some difference in measurable airflow...

(For the record, I have one of the DIY "gutter guard" grilles on mine, so I'm not particularly concerned about it as it is very open, but some of them on the market (especially some of the (cool) painted "flag" ones) would worry me....)

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