And some people get a front mount for looks, and aren't concerned with the potential blockage of air to the radiators.

I wanted the most air for everything, so I went V-mount, and opposed to a SMIC, I don't have radiator exhaust blowing on it.

 

A vented hood is in the future, just because it is needed for any RX-7 to vent heat.

It will be at the next meeting.

 

I love you Philip, but I have to call you on this one.

Radiator "exhaust" doesn't flow into or onto a SMIC with a duct bringing in fresh air from the nose.

Now heat soak is a different issue entirely.

 

You don't "need" a vented hood. They are nice but alot of cars do just fine without them.

IMO we are going to have to set you up with an AST elimination becasue of the hose connection mods that we made.

Still tring to talk you into a set of rims as well. Think of the "bling bling" potential.

 

rynberg,

i really like your responses, its a nice combination of being helpful, frustration and sometimes sarcasm.

 

I'm not disagreeing with you as I have the same setup, I'm simply stating the person that I quoted was opening a can of worms. I love my V-mount setup, but I'm going to try and rework the ducting a little bit.

 

See if you can use some aluminum heat tape for this. The stuff works great to seal ducts.

 

Exhaust air is blowing onto the duct and parts of the SMIC. Maybe the proper term for the effect is heat soak, but I place part of the blame on the rad exhaust.

 

Fine, a vented hood "is desirable for any RX-7 to reduce underhood temps because the engine generates a lot of heat, because the radiator and the IC need to vent, and because their is a pair of hot *** turbos generating heat. While not specifically required, a vented hood is desired, much in the same way pain reliever is desired upon waking up with a hangover, but not required." Better?

 

The radiator air blows onto the outside of the duct and intercooler, but not into the fins of the intercooler. That is why I used so much heat tape to ensure a good seal between the duct and the intercooler to ensure proper airflow. Air into the intercooler comes from the nose infront of the radiator which is outside air.

Heat soak is the heat that rises and transfers through convection from the radiator "soaking" the intercooler and everything else in the engine bay.

Radiator "exhaust" air doesn't blow into the intercooler or the duct.

 

Heat Soak, air rising from the radiator and heating different parts of the IC while the car is stationary. Both SMIC's and V-mounts will have this problem. Each will have a little variation on the other but in general the same effect. FMIC's will have very minimal issues with heat soak other than tubing etc. Radiator exhaust air blowing on the IC? Almost all SMIC's use fiberglass ducts, it doesn't conduct heat terribly well.

Intercoolers are not designed with stationary performance in mind, it's really odd to be worried about that unless you're a die-hard drag racer really worried about the first 300 feet.

Vented Hoods, the stock flow system is designed so that air exits the engine bay by flowing over the turbo's and exhaust as well as the spark plug side. This was "supposed to" provide cooling for the turbo's and engine in general. It doesn't seem to have worked too terribly well as the engine compartment stays far too hot. I can't say if there's a downside to not having that air flow around the turbos anymore but a vented hood sure seems to cool everything else off enough to make up for it and more. Will a V-mount work without a vented hood? Sure, just like an SMIC will. The only real difference is the angle the air exits at. With a V-mount it needs to make a more substantial turn to reach the exit point than a SMIC but the real difference to performance because of that is probably so small that it's not able to be measured. With a vented hood both SMIC's and VMIC's should have much improved performance in cooling, with the same immeasurable difference due to angle of air exit, but this time for the SMIC. FMIC's shouldn't see any significant improvement other than the overall system improvement of a cooler engine bay and associated parts from the heat release.

Hope that was neutral enough to not rub anyone the wrong way.

Kevin T. Wyum

word selection edit

 

How did you relocate the radiator without it interfereing witht he oil cooler thermostat? Could you take any pictures to show where everything is mounted and the clearance issues"? I had trouble putting in a FMIC before when relocating the radiator due to the oil cooler thermostat blocking the way. I just want to make sure it wouldn't be the case with a VMIC as well

 

I don't see why you would need the undertray anymore. It seems airflow would be better without it, since the air needs to escape out the bottom now.

 

It rains a lot in Houston. Thats why its needed.

 

Seeing as how my radiator sits lower, so does the fan shroud (it is below it pulling air down) and the PS lines are there also. I would rather have rocks or speed bumps hitting the undertray instead of the lines and fans/radiator directly.

I have lost a bit of clearance, and have noted this on speed bumps I can't take as fast as I used to, and some lousy road patches/repairs.

 

I'll take a shot later. It isn't an issue, the back of the radiator is up, at the level of the stock IC support bar. The mocal thermostat is below it. The CWR kit has a right angle line coming off oil sump/whatever, and the thermostat is connected there.

 

NICE setup!

 

FORMERPORSCHEGUY

that picture in your signature is driving me nutz!

where can i find one of those?

will

 

Both of these show what you want.


Below the top pulley, you can see the 2 lines from the oil supply, and the return to the filter. Below the belt and the first rubber hose, you can see some of the thermostate (aluminum). Under the last of the next 3 lines you can see the IC support bar. Next down from that is the top of the radiator. It is above the IC bar, and the thermostat is below it.



Reverse angle picture.

 

That's an idea but I I'll cross that bridge when I get there... right now there are some fundamentals to the ducts themselves that I need to change or would like to before I worry about sealing all the small gaps. Thanks though.
-Nic

 

Oh yes. FormerPorscheGuy can tell you all about duct fundamentals that need to be addressed

 

hm...when it comes to that question about the soak heat, it don't really bothers me as i can change to a better performance radiator. All i'm worried is more towards the turbos especially the single line turbo as it gets more heat!

 

You have no idea what you are talking about.

 

Eh?! Heat soak is an issue you'll deal with in regards to the IC not the radiator. So switching to a higher performance radiator would mean that radiator is dissapating more heat which then in turn gives you more heat soak when you're sitting still.... your statement didn't make sense

Anyway another thing I've thought about trying is coming up with a duct to place in between the radiator and IC. I'd place it parallel with the ground as a splitter to not only seperate some of the air coming in, but it may provide some heat shielding for when I'm not up to speed. I'll draw something up and cut it and then run some tests without it in and with it in to see if there would be any benefit to having something like that.

 

If you're going to the trouble of making such a splitter, you should make the angle adjustable. When you have it installed, you can monitor coolant and post-IC temps, and adjust the splitter to achieve your desired cooling balance.