How any guys are using an undertray with thier v-mount or are you not? if not what are you doin?

 

Nothing, since you need a low pressure area behind the Rad, and not having a tray will lower the pressure behind the rad, and the try was created to increase the pressure infront the rad, and that's eliminated with the flipping of the rad....

 

So i guess no undertray?

 

I'll be posting a thread later this week about why it's stupid to run without an undertray, no matter what intercooler setup you have -- and it's not coolant temp related....

 

you mind pming why? or posting cuz i need to know before my undertray gets here

 

Let's just say it involves a rock....I'll try to take pics tomorrow and post a thread about it. Worst case is that my fresh rebuilt motor with about 2k miles on it is damaged.....

 

Wow, a moderator admitting he did something stupid... that's a first

 

 

Damn dude!! I'm sorry to hear this

I took my car up to the mountains the day after I got her back on the road, and forgot to put the undertray on...coolant temps shot up on hill climbs, never thought about road debris has a potential hazard...needless to say, I haven't run without one since.

 

I run without the belly...but I am an LS1 guy....*****...I better put that **** back on.

 

The undertray is necessary with any IC. Without one your not going to get any air flow through your rad.

Then you have the problem the guy above mentioned about hitting any objects on the road. It a clean shot into the engine bay without a tray on.

 

not true with a vmount, look at how the rad sits... it doesn't matter, trust me, i know.

however, i did put my undertray back (needs a lil modification (*ie cutting) with a vmount) just because i was using it to help stabalize my front bumper and what not. and yes, it can help deflect some road debris.

harrison

 

Its works , but your never going to max out the air flow if it doesnt have a straight path ...as in the undertray. Air will always find the easiest way out and without a tray your not getting much if any air flow.

 

You don't seem to understand the principle - in a v-mount setup, the undertray hinders flow because it increases pressure behind the radiator. In a stock mounted setup, in increases pressure in front of the radiator which is helpful in that case. The best solution for a v-mount is some kind of screen that still allows good airflow out under the car but protects against road debris flying up into the engine bay. I'm going to have to fabricate something like this after I get my v-mount setup done.

 

How about an undertray with louvers? Or better yet, cut louvers in the stock undertray.

 

Really? I must have admitted to stupidity before....maybe before I became a moderator...

 

Yup, a louvered undertray would be perfect. Just harder to fabricate than a screen probably.

 

Heh, sounds similar to running the Xcessive cast oil pan, hitting a really large rock which proceeds to split the cast pan in half and ruin your brand new $7K engine. I've never done anything like that, sigh, but I digress....

I'd somehow modify the stock splashguard with a group of say two or three square holes, maybe elongated rectangles, and then affix some screen on the top side to keep rocks out. Best of both worlds. I cut the wheel liners for my Mocal oil coolers to breathe a bit better and I've been lucky so far in that I haven't punctured either one with a rock. I plan on screening in that section asap.
Michel

 

Nah, the stock undertray can be done pretty easy it would just take some time to complete. All you would need is a sharp utility knife w/ new blades, a louver template, a 2" putty knife, and a heat gun.

 

Yeah that would probably work. I'm probably going to go a different way though. Maybe I'll even go so far as to do a fg louvered undertray. We'll see what I'm in the mood for when I get to that point.

 

Even with a stock undertray, there should be significant space for air to exit, roughly the distance betweeen the tray and the cross member. It really wouldn't be bright to run with the thing exposed for "flow."

 

I replied to the other thread...but did this to assist flow through vmic...

 

Very Nice

 

Nice work Hedgehog! And ptrhahn I agree with you but I think the optimal scenario is without it.

 

I would still rather run the undertray then to risk a big rock jumping up and smashing into the radiator or worse. So I will be retaining my undertray with my VMIC. Had to cut it a little to make it fit but nothing major.