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Old 26-03-2019, 08:04 AM
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niknitrous niknitrous is offline
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Steel vs fiberglass hood

Looking at 'upgrading' to a 2" cowl hood
1. for engine bay cooling & 2. for looks.
What do you think about opting for a fiberglass hood for weight saving?? I do some track work (SMSP & Wakefield park circuit)
I know I will have to change the gas springs which is not a problem.

Any other considerations?

(am going to wrap in matt black)
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Old 26-03-2019, 07:07 PM
Geoff 4 Geoff 4 is offline
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Steel bonnets weigh quite a bit, so unless it is a 6000 funeral hearse, FG bonnet is probably worth the trouble. Also helps with weight transfer. I would be using the scoop for cold air induction, not engine cooling. Every 5*C reduction in inlet air temp gives a 1% HP increase, free HP from idle to....
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Old 27-03-2019, 09:06 AM
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Spoke to these guys based in VIC and they can make a 2" reverse cowl hood for 68 Camaro - but will need to make a FG mould... anyone else interested in getting one? (can split the cost of the mould)

https://thefibreglassfactory.com.au/
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Old 27-03-2019, 06:03 PM
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For a bit of circuit work I doubt you'll see much difference between either, I'd probably buy what best suited my wallet and the aesthetics of my car.

Some glass hoods don't have a good name(poorly made), though there are some in the States that some guys like.

I have a Harwood and I'd consider it a "racecar" hood. I'd rather a steel hood.


"Every 5*C reduction in inlet air temp gives a 1% HP increase, free HP from idle to...."

^^^^^^Just like the FG vs Steel, you probably won't notice this either
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Old 28-03-2019, 11:16 AM
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Originally Posted by rodent View Post
For a bit of circuit work I doubt you'll see much difference between either, I'd probably buy what best suited my wallet and the aesthetics of my car.

Some glass hoods don't have a good name(poorly made), though there are some in the States that some guys like.

I have a Harwood and I'd consider it a "racecar" hood. I'd rather a steel hood.


"Every 5*C reduction in inlet air temp gives a 1% HP increase, free HP from idle to...."

^^^^^^Just like the FG vs Steel, you probably won't notice this either
Thanks for the voice of reason Jim. You are right... if it ends up costing more than $1,000 then surely not worth it.
What car is your Harwood FG on?
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Old 28-03-2019, 04:41 PM
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Thanks for the voice of reason Jim. You are right... if it ends up costing more than $1,000 then surely not worth it.
What car is your Harwood FG on?
None, it was on the Nova now it's wall art. I'm rocking an AMD 4" cowl hood and wouldn't go back to FG unless it was perfect.

I do have a contact in the States for FG hoods if that's the direction you wanna go. But with the buck being the way it is.......it's never gonna be cheap
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Old 01-04-2019, 06:43 AM
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None, it was on the Nova now it's wall art. I'm rocking an AMD 4" cowl hood and wouldn't go back to FG unless it was perfect.

I do have a contact in the States for FG hoods if that's the direction you wanna go. But with the buck being the way it is.......it's never gonna be cheap
Yep steel for me then, thanks for the input.
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Old 05-04-2019, 01:12 PM
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Any other considerations?
If you want cold air induction then you need a cold air box around the carb, otherwise you have hot air from the engine bay trying to make its way out the bonnet hole probably clashing with cold forcing its way in; that is, if it's a reverse cowl & the screen angle, aerodynamics, etc. causes the air to flow into the cowl.

s
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