06-03-2012, 08:33 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,741
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Quote:
Originally Posted by bobcowan
Inch for inch, I think the mod motors are pretty darned good. They are an excellent option for people who want a good solid crate engine that starts when you turn the key, will get the groceries on Friday, and streak down the drag strip on Saturday.
If you want big power numbers, it seems that you need forced induction. Blowers seems to be the most popular in the US - probably because of the ease of installation. But there are some turbo kits available.
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I would agree with you in a NY minute Bob. The turbo guys actually make some scary big HP numbers but in terms of a high torque value at the crack of the throttle and the attendant precision feel it returns to the cockpit and driver the positive displacement blowers are pretty darn impressive.
Quote:
Originally Posted by bobcowan
However, there is one important consideration - heat. I'v raced with a few of supercharged cars - a couple of blown Mustangs, and and a blown Corvette. They are really fast for 2-3 laps, and then they're done. They heat soak and the computer shuts them down. OTOH, my NA stroker is making the same lap times at the end as it is in the beginning. There's a lot to be said for that.
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Heat soak on any of the blown engines is a big issue. Increasingly there have been incremental improvements in handling the problem. One of the most creative and certainly continuous because of the process energy source has to be these guys, click here => Killer Chiller
Their chilling system employs a very creative approach using an AC pump and a dedicated chiller to ice down a one or two gallon reservoir of coolant for the air to water intercooler. The chiller can take two gallons to freezing (you need to run some anti-freeze) in about two minutes if you run a two pump system. One pump recirculates coolant between the chiler and the reservoir and the other between the reservoir and the intercooler.
The after blower air temps can get down to ambient or less pretty easily. The system is quite impressive.
Ed
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