NashSS Posted July 29, 2007 Report Share Posted July 29, 2007 (edited) When I bought my truck im assuming it has the goodmark cowl hood on it. its definatly a cowl hood but maker is unknown but anyways at the end of the cowl it has holes for realesing air and heat but the previous owner put the stock heat sheild back on the bottom of the hood so basically its for looks and nothing else. Can I cut some off of it near the back to make the hood functional, take it off, leave it? This is my first truck with a cowl hood so im unsure on what is ok and whats not because these motors get hot and I dont want to burn my paint or anything like that. I can take pictures if needed and one more thing i do drive my ss in the winter time so I would probably need it back on in winter to help hold heat in. thanx Edited July 29, 2007 by NashSS (see edit history) Quote Link to comment Share on other sites More sharing options...
misterp Posted July 29, 2007 Report Share Posted July 29, 2007 (edited) Opening the hood at the base of the windshield will not vent the heat from underhood; there is a huge amount of pressure there at road speed, you will be forcing air in rather than letting it flow out from underhood. If you want to extract heat from underhood then you need to cut a hole in the hood where the airpressure is negative (not pressurized) and that would be as close to the front edge of the hood as possible yet still behind the radiator - you ideally want the hot air of the radiator to be allowed to vent up through the center of the hood. Look at the hood on the Saleen 337 truck, or this Vette road race hood (the 'white' vent, ignore the vents over the front wheels) Mr. P. Another hint - this is the cure for the common hood lifting at high speed problem (relieve the air pressure underhood, give it a place to escape); I would not be surprised if the truck gained another few mph in top-end MPH too. Edited July 29, 2007 by Mr. P. (see edit history) Quote Link to comment Share on other sites More sharing options...
NashSS Posted July 30, 2007 Author Report Share Posted July 30, 2007 ok so if i were to remove the insulation i would be forcing air in hence cowl induction hood therefore causing a common hood lifting problem or removing it would prevent this? Im not clear right now I dont drive more than 100mph cuz ive seen some shit happen at high speeds and scares the hell out of me im more into getting to around 100 faster not going faster than that. Quote Link to comment Share on other sites More sharing options...
misterp Posted July 30, 2007 Report Share Posted July 30, 2007 I am wanting to improve my truck's aero as well, the truck goes like hell to about 94-95 mph then *bam* like hitting an invisible wall. Only remove the cowl block-off panel if you are going to plumb that air to the fresh air intake (air cleaner); else you are making things worse, and yes you will be adding more pressurized air underhood and it will want to lift more as well as adding a lot more drag, slowing you down and hurting mileage. Mr. P. Quote Link to comment Share on other sites More sharing options...
NashSS Posted July 30, 2007 Author Report Share Posted July 30, 2007 well nevermind then because hurting gas mileage is the last thing I want to do and what do you mean hitting 94-95 then bam? My truck is Zippy tuned so I can pass 95mph if your assuming im stock tuned. Quote Link to comment Share on other sites More sharing options...
misterp Posted July 30, 2007 Report Share Posted July 30, 2007 well nevermind then because hurting gas mileage is the last thing I want to do and what do you mean hitting 94-95 then bam? My truck is Zippy tuned so I can pass 95mph if your assuming im stock tuned. Just saying that my truck pulls hard to almost 95-mph then struggles after that point as the air resistance piles up Quote Link to comment Share on other sites More sharing options...
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