Custom shaker with a Vortech
07-29-2007, 10:45 AM
#22
3rd Gear Member
Thread Starter
Join Date: Jul 2005
Posts: 556
RE: Custom shaker with a Vortech
ORIGINAL: drbobvs
I think it looks great, very neat and clean, but!.... As eluded to, that shield around the filter may be doing more harm than good. The shaker hoods are a very nice looking mod, but they are not as "functional" as one would think.
As you drive down the roadair actually travels several inches over the hood creating avacuum. This is why our hoods will shake or 'lift' as high speed, this, a result of the negative pressure over the top. I'm sure we've all seen commercials and such of the smoky air of a wind tunnel test, and you see the smoke flowing above the car. This vacuum effect is why a heat extractor hood aka the old 'cowl induction" from the late 60's were so much more effective than the 'ram air' hoods of the day.
A truly functional hood scoop has to be approximately 8" high, or higher to actually 'catch' air, unless of course, a scoop is sticking out in front of the car.
But back to my point. The heat sheild may be blocking the usual air from entering the filter as Stkjock mentioned, and decreasing a potentially better air volume. A before and after heat shield dyno run with the hood closed would be interesting to see!
I think it looks great, very neat and clean, but!.... As eluded to, that shield around the filter may be doing more harm than good. The shaker hoods are a very nice looking mod, but they are not as "functional" as one would think.
As you drive down the roadair actually travels several inches over the hood creating avacuum. This is why our hoods will shake or 'lift' as high speed, this, a result of the negative pressure over the top. I'm sure we've all seen commercials and such of the smoky air of a wind tunnel test, and you see the smoke flowing above the car. This vacuum effect is why a heat extractor hood aka the old 'cowl induction" from the late 60's were so much more effective than the 'ram air' hoods of the day.
A truly functional hood scoop has to be approximately 8" high, or higher to actually 'catch' air, unless of course, a scoop is sticking out in front of the car.
But back to my point. The heat sheild may be blocking the usual air from entering the filter as Stkjock mentioned, and decreasing a potentially better air volume. A before and after heat shield dyno run with the hood closed would be interesting to see!
If you look at my design, you'll notice there is about a 2-3 inch gap from the shield to the filter, and the shield is onlyover about 1/3 of the surface area. Taking my ques for this shield directly from Vortech, I guess I am relying on their R&D more than my own.
I'd be willing to wager that there is no appreciable impact on power positve or negative.
07-29-2007, 11:50 AM
#23
5th Gear Member
Join Date: Aug 2006
Location: Los Angeles Ca
Posts: 2,127
RE: Custom shaker with a Vortech
ORIGINAL: lieu910
This gets very convoluted, and here is why.The purpose of a heat shield is to deflect the hot air coming off of the engine from the intake. There is no question that hot air is a power robber, but just how effective a heat shield isthe issue. Many CAI kits make some type of effort to buffer the air intake from engine heat.
If you look at my design, you'll notice there is about a 2-3 inch gap from the shield to the filter, and the shield is onlyover about 1/3 of the surface area. Taking my ques for this shield directly from Vortech, I guess I am relying on their R&D more than my own.
I'd be willing to wager that there is no appreciable impact on power positve or negative.
ORIGINAL: drbobvs
I think it looks great, very neat and clean, but!.... As eluded to, that shield around the filter may be doing more harm than good. The shaker hoods are a very nice looking mod, but they are not as "functional" as one would think.
As you drive down the roadair actually travels several inches over the hood creating avacuum. This is why our hoods will shake or 'lift' as high speed, this, a result of the negative pressure over the top. I'm sure we've all seen commercials and such of the smoky air of a wind tunnel test, and you see the smoke flowing above the car. This vacuum effect is why a heat extractor hood aka the old 'cowl induction" from the late 60's were so much more effective than the 'ram air' hoods of the day.
A truly functional hood scoop has to be approximately 8" high, or higher to actually 'catch' air, unless of course, a scoop is sticking out in front of the car.
But back to my point. The heat sheild may be blocking the usual air from entering the filter as Stkjock mentioned, and decreasing a potentially better air volume. A before and after heat shield dyno run with the hood closed would be interesting to see!
I think it looks great, very neat and clean, but!.... As eluded to, that shield around the filter may be doing more harm than good. The shaker hoods are a very nice looking mod, but they are not as "functional" as one would think.
As you drive down the roadair actually travels several inches over the hood creating avacuum. This is why our hoods will shake or 'lift' as high speed, this, a result of the negative pressure over the top. I'm sure we've all seen commercials and such of the smoky air of a wind tunnel test, and you see the smoke flowing above the car. This vacuum effect is why a heat extractor hood aka the old 'cowl induction" from the late 60's were so much more effective than the 'ram air' hoods of the day.
A truly functional hood scoop has to be approximately 8" high, or higher to actually 'catch' air, unless of course, a scoop is sticking out in front of the car.
But back to my point. The heat sheild may be blocking the usual air from entering the filter as Stkjock mentioned, and decreasing a potentially better air volume. A before and after heat shield dyno run with the hood closed would be interesting to see!
If you look at my design, you'll notice there is about a 2-3 inch gap from the shield to the filter, and the shield is onlyover about 1/3 of the surface area. Taking my ques for this shield directly from Vortech, I guess I am relying on their R&D more than my own.
I'd be willing to wager that there is no appreciable impact on power positve or negative.
07-30-2007, 08:50 PM
#26
4th Gear Member
Join Date: Apr 2005
Location: LI, NY
Posts: 1,065
RE: Custom shaker with a Vortech
Dyno runs with a shaker are inaccurate because the purpose of the shaker is to redirect air from the shaker scoop to the air intake. The faster you drive the more air that is forced into the air intake. On a dyno, the car is standing still. On some dynos, there is a fan that blows cold air in front of the radiator to prevent the car from overheating but it does not simulate the volume of air being forced into the air intake at increasing speeds.
You may be able to get more accurate measurements form a G-Tech. It calculates your HP from the G forces on the car.
http://www.gtechpro.com/
You may be able to get more accurate measurements form a G-Tech. It calculates your HP from the G forces on the car.
http://www.gtechpro.com/
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