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  #16 (permalink)  
Old 05-27-2010, 07:43 PM
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Winter Horsepower/summer Horsepower

I know I'm a little late to the party, been busy. I finally found the chart to keep the numbers right.

According to a Marine engine repair manual, rated horsepower is under ideal temperature and humidity.

Rated horsepower is reduced by ~14% during the summer months.

And I quote, " Heat and humidity affect the density of the air similar to high elevations. This is particularly noticeable when your engine is propped out on a cool, dry spring day then seems to lose its pep during hot , humid August days. You may lose up to 14% of the available horsepower.

I have noticed this change in hot, humid months.

When you go to the drags in the fall, everybody is running like crazy. During the heat of the summer, everybodys car slows down.

Could be, some know how to retune for the heat and humidity.

This is something a thermostat ain't gonna cure.

olnolan

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Old 05-28-2010, 07:03 AM
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Quote:
Originally Posted by cobalt327
Going to look at these fellas. Going to pay the USD even though their in CAN

But the front of the impala is pretty tight. There aint much place for to mount the pick ups. Goin to have to get inventive. So I dont think I'll buy the whole kit,just the double horn then off to the hardware store
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Old 05-28-2010, 07:46 AM
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I noticed just now that they have "techs on duty, ready to assist you at (905) 549-6135". Might be worth a call if your cell phone minutes can take the hit! lol

Something I'm wondering, is if taking the air from the cowl area will work on the Impala. They have different styles of housings, some w/a single large inlet, that could be faced "backwards" to do this, if you wanted.

Then there are snorkels that were used OE on some GM cars (they have a variety of snorkels in their "Parts" section):



These shown don't have huge openings, but a pair would surely supply enough cool air. They're available in 3" x 8" and 4" x 11" size, too.

It's an interesting project, in any event- and something that could benefit just about any street machine.
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Old 05-28-2010, 07:49 AM
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Quote:
Originally Posted by cobalt327
I noticed just now that they have "techs on duty, ready to assist you at (905) 549-6135". Might be worth a call if your cell phone minutes can take the hit! lol

Something I'm wondering, is if taking the air from the cowl area will work on the Impala. They have different styles of housings, some w/a single large inlet, that could be faced "backwards" to do this, if you wanted.

Then there are snorkels that were used OE on some GM cars (they have a variety of snorkels in their "Parts" section):



These shown don't have huge openings, but a pair would surely supply enough cool air. They're available in 3" x 8" and 4" x 11" size, too.

It's an interesting project, in any event- and something that could benefit just about any street machine.
We use to make our own out of laundry ( drier ) hose .
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Old 05-28-2010, 12:57 PM
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Those scooped plastic pieces shown in the above pic can also be mounted below the bumper, ala the '68-69 Olds 442.

I have gotten "crafty" with home heating/ventilation formed register openings too, if you doctor them up a little and paint them black they will hide below the core support quite well, and there are lots of shape and outlet variations..
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Old 05-28-2010, 02:23 PM
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Having looked at their stuff I'm of the conclusion its the horn replacing the headlight or bust. Man thats so hotrod it aint funny
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Old 05-28-2010, 05:50 PM
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[QUOTE=sooper]Going to look at these fellas. Going to pay the USD even though their in CAN

don't worry we canuks will get you back...we do every time when no body else will..count on it. And yeah putting aside a light for cool air is when you know there is no turning back your ride...give'r
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Old 05-30-2010, 06:27 AM
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"160 degree thermostat lets things get up to 180"

The thermostat does not dictate the engine running temp., only when coolant starts to flow through the rad.

I have a 355 motor with aluminum heads, rpm intake and BG Speed Demon sitting on a Summit two inch aluminum spacer, cowl induction hood.
It ran fine with a 180º thermostat and 190º on 180º off fan switch but prolonged situations at idle caused the motor to freak out, vacuum dancing around, hesitation and cutting out.
That has gone away since I went to a 160º thermostat and a 175º on 160º
off fan switch.
My oil temp is still as it was, tops out at 180º using a cooler.
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