I'm not really a new member but clearly I don't post a lot.
I have a question that I have not been able to find the answer by searching.

I am adding dual oil coolers (used NASCAR) to my FD. They have -6an fittings on them. Is -6 too small of line to use? If so, should I convert at the oil cooler up to -8? I don't have them in my hands yet so I'm not sure if the fittings can just be changed or what.

The engine has a half bridge, Carlos Lopez balanced rotating assembly (scalloped rotors), 3mm Goopy seals & a 35R T4 w/fully divided manifold. It does have a Koyo radiator too. I am hoping to be around 450-500rwhp.

Thanks for any input.

 

06AN is a bit small and would choke flow more than I would personally feel comfortable with. For reference, 06AN is 3/8" ID. This would be an appropriate size for feeding oil or coolant to your turbo. For the oil cooler lines, most people use 10AN (5/8" ID) to promote good flow. 08AN (1/2" ID) could possibly be used in a pinch, but I would be concerned about restricting flow.

The difference between the AN adapters for the engine between 08AN and 10AN is about $1 each at Jegs. Same thing with their push-loc hose and hose ends. My own 20B FC has 10AN lines for this reason. Remember, oil cooling accounts for roughly 1/3 of total cooling in a rotary. A Nascar vehicle isn't as dependent on oil cooling as a rotary of comparable power. Nascar engines aren't turbocharged either

The only way that I know of to implement the Nascar coolers without bottlenecking the flow too much is to plumb them in parallel. There has been some discussion every now and then about series vs parallel oil coolers in the 3rd Gen section, but I am not aware of any decisive outcomes. To be honest, this is a bit out of my area of knowledge, so I would like to refer you to someone much more informed than I am.

Since you're in Groveport, you may wish to stop in at Defined Autoworks (555 Corbett Rd, just off of Hamilton Rd) and talk to Logan & Peter about your cooling needs. Chances are that the shop's demonstration 20B FD will give you a few ideas on what will be the best solution. It may be as simple as cutting the 06AN bungs off of the Nascar coolers and welding on some 10AN bungs. Either way, you'll be much better armed to tackle the problem correctly after talking with Logan & Peter.

 

Ive always used -10 fittings for my oil cooler stuff. I believe the above to be very true, you could create alot of problems running something smaller.

 

Dual 6AN doesn't seem like a problem, as long as it's 10AN when the two lines combine