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under engine plastic shroud ???

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#1
Todd Tagget

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Do I need it ?? Or throw it out ? Or aerodynamically do you guys run them?
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#2
Muda

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You need it.
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#3
Jim Drago

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Do I need it ?? Or throw it out ? Or aerodynamically do you guys run them?


If you remove it the car will run hot in most climates.
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#4
Todd Tagget

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Ok thanks guys,,
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#5
dstevens

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Great, another thing I don't have that didn't come with the donor. :bash: :spin: If they haven't crushed that 93 at a local salvage maybe it has one.

I looked at the FSM and on MSM and couldn't find a reference to said piece. I called MSM a couple of times last week and they were closed (though my order still shipped) so I'll see tomorrow if they've taken the holidays off. That's a pretty common thing for the non show operations people in our biz to shut down from the week before Xmas until the 1st or second week of Jan. As for show staff, well they (the people that take the holidays off) add more shows and we can't take it off. :guinness: It's all in the game, yo....

Anyone know what section or part number it is?

#6
Jim Boemler

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#7
Jamz14

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That seems counter intuitive. Why would the engine run hotter with the shroud off? It would seem that if you increase the air flow around the engine by removing it, it would run cooler.
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#8
Mike Collins

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The shroud forces the air through the radiator and past the engine. Otherwise you would loose a lot of air flow.
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#9
FTodaro

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It you look at it closely its actually a pretty well designed piece. I replaced my original one that got bent up and busted pretty good. It does a nice job of channeling the air where it needs to go efficiently and out the rear.

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#10
Jamz14

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Thanks guys
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#11
dstevens

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Thank you Jim! :cheers: :thumbsup:

I got a 10x10 drive up/ roll up storage today for a couple months to store what I'll take off and sell or scrap from the stock car. It's already mostly full. With the removed parts from the SM build..... DOH!!! And that's not counting the couple of shelves filled with the new/refurbed Miata stuff still in the shop. There are a lot more parts on that chick car than I thought.

#12
Funracer

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I don't have it on mine (it was not on the car when I got it) and my car has never overheated.
Is there another reason to have it, like its required by the rules or the car goes faster (less drag)?

Still waiting for NOLA to open.

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#13
dstevens

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I don't have it on mine (it was not on the car when I got it) and my car has never overheated.
Is there another reason to have it, like its required by the rules or the car goes faster (less drag)?


Could be a weenie protest in the making. Rules say nothing about removing it. I'd defer to Drago and Meat and if they suggest having one, use one. My local guys say that haven't crushed that 93 yet.

#14
Todd Tagget

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Thank you Jim! :cheers: :thumbsup:

I got a 10x10 drive up/ roll up storage today for a couple months to store what I'll take off and sell or scrap from the stock car. It's already mostly full. With the removed parts from the SM build..... DOH!!! And that's not counting the couple of shelves filled with the new/refurbed Miata stuff still in the shop. There are a lot more parts on that chick car than I thought.

Dont' things in storage units in Vegas start to melt in April or May ???
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#15
Tom Hampton

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Could be a weenie protest in the making. Rules say nothing about removing it. I'd defer to Drago and Meat and if they suggest having one, use one. My local guys say that haven't crushed that 93 yet.


Not necessarily a weenie protest. Suppose one found a way to change the air flow through the engine compartment that resulted in cooler air entering the intake. Part of that solution involved the removal of the undertray? If you could do that AND still keep the engine cool....

As you said, id it doesn't say you can.... then. It's required.

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#16
dstevens

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Dont' things in storage units in Vegas start to melt in April or May ???


About June is when the desert makes hell look like a vacation spot and stays that way until mid Sept. I forgot, for locals Vegas is hell....and a vacation spot. :king: Spring and Fall are pretty nice. Even if the town is a shithole.

Right now in the shop it's 47* F. Or as the locals say, freezing.......

#17
dstevens

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Not necessarily a weenie protest. Suppose one found a way to change the air flow through the engine compartment that resulted in cooler air entering the intake. Part of that solution involved the removal of the undertray? If you could do that AND still keep the engine cool....

As you said, id it doesn't say you can.... then. It's required.


Tom's got his Adrian Newey hat on. :pimp:

You know what they say, once an engineer, always an engineer. If you figure out a way to do such a thing, let me know. I promise I won't do it or tell anyone else (that I'm doing it). :spin: No, really, Scout's honor....... :whistling:

#18
Keith Novak

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The car may not have overheated yet, but have you driven it on a really hot day and flogged it for all it's worth? If you find out it does start overheating on a day like that, you'll wish you had an undertray handy.

We used a retired SM in a 24hr chump car race where daytime temps reached the mid 90s. On the test day we didn't have an undertray and it immediately started overheating. We scabbed something together with cardboard, duct tape and zip ties and the car ran much cooler.

Just like the air blowing in your windows doesn't do nearly the job keeping the driver cool as a duct pointed directly at the driver, the turbulent air coming up the bottom without an undertray doesn't do nearly as good a job cooling as forcing it through the radiator. It's probably not as good for overall aero either but I can't confirm that. Its one of those parts where if you don't have one or you have a mangled one and can't get your hands on a junkyard one, the Mazda part isn't very expensive and unless you mangle that one, it's a one time purchase that buys you better performance, legality, and piece of mind.
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#19
dstevens

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We used a retired SM in a 24hr chump car race where daytime temps reached the mid 90s. On the test day we didn't have an undertray and it immediately started overheating. We scabbed something together with cardboard, duct tape and zip ties and the car ran much cooler.


Plus it fits the motif of Chump Car. Nicely done. The tray is still pretty cheap from MSM and I bet the salvagers have them a plenty. And the 93 Miata they said they didn't scrap was no where to be found on the yard. They are still telling me they have a 79 Miata (after telling them a few times there is no such thing). It's one RX-7 looking Miata that's for sure.....




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