on our stock 12a intake manifold there are 2 coolant plugs. would it be benificial to remove the plugs and have a small external radiator instead of leaving it plugged? also i have a quaestion daoe coolant have flow route through those or does it just manifest in there if not i thought that running some fabed lines from the manifold to the external rad right behind the stock then back into manifold would creat a cooler intake manifold therefore creating a cooler intake charge for better atomization. has anyone done this or think its a good idea just a thought let me know my feelings wont be hurt.

 

nobody huh not even a wtf are you talking about. ohh well

 

I read it but wasnt sure if it would work or not. If it does though, please post because I would be interested in this also.

 

Had to think about it for a while. First, youd have to block off the coolant from the motor so it doesnt get into the intake. Im not sure about the routing of the plugs as to whether it would work or not. But lets say it does for a moment.

Something like a small tank full of ice water and a pump to circulate it might work. Only for 1/4 mi or Autox obviously.

Your concept I dont think will work and heres why. The intake air will be near or at ambient as it enters the carb (trust me Ive tested this). Its flowing thru the manny too fast to pick up much heat but it keeps the manny relatively cool on the interior walls. You have hot air comming off the radiator into your "intake cooling" rad. Simple physics. High seeks low, whether temp or pressure. So your warming the intake cooler with warm air and warming the intake with it (cause its cooler). And even putting your intake cooler in front of the rad would just be ambient to ambient, no transfer of heat. No differential, no heat transfer. Good thinking though. Shows your paying attention.

 

It's interesting that you ask this now. I think that Carl is right about the cooling not being effective but I thought I would mention what one of my co-workers did to his 4.7 liter dodge pickup because it is similar.

He doesn't have any hard numbers or anything but he seems to think that this made an improvment.

What he did was run copper lines on his fuel rails that he circulates coolant through and he applied computer Heat Sink paste (the thermat transfer stuff between the cpu and the heatsink) between the copper lines and the fuel rails. He then modded a computer water cooling kit to chill the coolant and installed a garden pond water pump from the local hardware store to circulate it. HE also put in a swith to turn it on and off and wrired it to have constant power so wh can chill his fuel rails while parked with the engine off. (Bet you couldn't tell that I work at an Information Technology firm.)

I don't know how well it works when the engine is running but when the engine is off the cooling block gets quite cold to the touch pretty quickly.

I'm still not convinced that this is doing him any good but he seems to think that it is.

 

i might fiddle **** around with some ideas. my question is though does coolant flow through the manifold? i know there are coolant holes on our motor and when you take the manifold off there are 2 rubber o rings to seal the manny to the block and if you look at the manifold the coolent looks like it goes in1 hole in and out the other. next question what is the temperature of our intake manifold seeing how it is so close to our header i guess a nice heat big and effective heat shield would be good at this point as well. if you intake is running warmer than our cooling system then i still dont understand how looping the 2 through each other wouldnt be benificial. thanks for the interest and rx7 carl i spoke to you about a carb i work on ea6b aircraft for the navy i think you work on 707 for boeing can you post a pic of you modded carbs because i think i might have one off of this raced 81 7 i scored for free. thanks

 

I was reading on how the choke worked. basically when the intake manifold is cold fuel will stick to it. This makes it run funky and that is why the choke is needed when cold. I am thinking that they have coolant lines going through the intake manifold for this reason partially. Maybe, I am thinking it would be a little easier to get the engine in its entirety to run cooler. Would be the same overall I would think. Please correct me if I am way off on the first part about the choke.

 

yes i do agree entirely with having a cooler running engine over stock ie upgrade ot an aluminum rad. or fc rad conversion but i was just getting creative to see if there would be any improvments it wouldnt be anything large just getting creative actually the way i looked at it the car is 20 yrs old if someone hasnt thought if it by now then any idea is just pbly not any good.