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Expiremental OM617 build
atypicalguy Offline
Holset
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Posts: 420
Joined: Oct 2013
Location: LA
#51
RE: Expiremental OM617 build
Great work on your project so far. Sounds like a fun car to drive. I forgot how big your air to water heat exchanger is. Would you mind sharing dimensions? I need to figure out how big mine needs to be. Probably similar to an air to air cooler to get similar heat rejection. I also think most of these systems have inadequate pump flow; I have heard it needs to be quite large to transfer enough heat.
11-19-2017, 12:52 AM
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R-3350 Offline
Dreaming of compounds
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Posts: 132
Joined: Feb 2016
Location: Western NC USA
#52
RE: Expiremental OM617 build
the core not counting the end tanks is 11" wide 6" long and 4.5" thick with 3" in and outlet supposedly its rated to 800-1000 cfm flow at up to 100psi. im feeding it through 3/4 npt barb fittings and 7/8 heater core hose to a bosch cobra pump and a 30 row oil cooler. i need to shorten the plumbing and get a bigger radiator for it but it works well enough for now. ill likely upgrade the entire intercooler circuit once i swap the engine radiator out for a much larger one and add the secondary head rad. looking at additional oil cooling, atf coolers, and a few extra goodies too. lol probably gonna end up with a dozen radiators stuffed in every nook and cranny in the car to keep it cool at high speed.


air to water coolers can be a great deal smaller for the same ΔT capacity due to the much greater specific heat, mass, and thermal conductivity of water vs air. at least if you get one with a true water to air core. i don't have any good photos but if you look the air side should have 2-3X larger passages than the water side. with an air to air you need to flow much more coolant mass to get the same thermal rejection capacity so you end up with a much larger package than you would otherwise with AtW.
85 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
11-19-2017, 02:59 AM
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atypicalguy Offline
Holset
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Posts: 420
Joined: Oct 2013
Location: LA
#53
RE: Expiremental OM617 build
There must be some sort of flow calculator for the proper pump flow rate. And I recall something about turbulators in the water flow being a good thing to increase the heat transfer by preventing laminar flow of water inside the cooler?
11-21-2017, 09:25 PM
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