Another Forced Induction Build Done Right! - Page 7 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #61 of 90 Old 1st November 2017, 02:59 PM Thread Starter
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Originally Posted by Patrick_Arnold View Post
Affirmative. I'm happy to check.
Bulldogee rocks the pulley world. He also made my aluminum bumper shock mounts. World class fabricator.

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post #62 of 90 Old 1st November 2017, 03:33 PM
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Fantastic build thread. I just wanted to understand what is the benefit of removing the oil cooler?
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post #63 of 90 Old 1st November 2017, 03:42 PM Thread Starter
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Fantastic build thread. I just wanted to understand what is the benefit of removing the oil cooler?
Thank you!

Can of worms, here, as there are divergent views. Our view, shared by many who have spent a lot of time trying to extract power from the S62, is that the under-plenum oil heat exchanger heats up the metal plenum and thus, increases AITs, without any corresponding or offsetting benefit. Replacing it with an external oil cooler provides the cooling benefit without increasing AITs. Now, to be sure, the heat exchanger also serves to heat up the oil after startup, but on sleeved motors, race motors and other higher performance S62s, that generally is not an issue.

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post #64 of 90 Old 1st November 2017, 04:16 PM
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Thanks for the prompt response Peter. I figured there had to be a good reason for BMW engineers to put it there in the first place. I guess they weren't thinking about future forced induction mods.
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post #65 of 90 Old 1st November 2017, 04:16 PM
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Yeah, I'm always amazed at the blast furnace that is the E39 M5 engine compartment. Starting way back in time here with greg's thermocouple data gathering to living with it now for the past 14 years. I've always opened the hood every time I park the car in the garage to not allow underhood temps to soar and bake everything. The lower plenum is hot as fire most all the time.

There's a profound difference compared to the E90 M3 with the S65 and its external, lower mounted, oil cooler and I suppose better airflow management through the engine compartment. It's nowhere near as crazy hot underhood, even after driving very hard.

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post #66 of 90 Old 1st November 2017, 04:43 PM
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Originally Posted by CSBM5 View Post
Yeah, I'm always amazed at the blast furnace that is the E39 M5 engine compartment. Starting way back in time here with greg's thermocouple data gathering to living with it now for the past 14 years. I've always opened the hood every time I park the car in the garage to not allow underhood temps to soar and bake everything. The lower plenum is hot as fire most all the time.

There's a profound difference compared to the E90 M3 with the S65 and its external, lower mounted, oil cooler and I suppose better airflow management through the engine compartment. It's nowhere near as crazy hot underhood, even after driving very hard.
I know it is very tight under the hood and more so with a supercharger, but has anyone looked at piping fresh air to the under plenum area to get some active cooling going? Even if you could get some air to the lower front of the plenum, I'm not sure there is a good exit path for it. The hood is sealed to the firewall, so the air can't go up and looks like it would need to go down along the transmission tunnel. Time for some louvers on the back of the hood along the windshield?

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post #67 of 90 Old 1st November 2017, 05:09 PM
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Originally Posted by gzig5 View Post
I know it is very tight under the hood and more so with a supercharger, but has anyone looked at piping fresh air to the under plenum area to get some active cooling going? Even if you could get some air to the lower front of the plenum, I'm not sure there is a good exit path for it. The hood is sealed to the firewall, so the air can't go up and looks like it would need to go down along the transmission tunnel. Time for some louvers on the back of the hood along the windshield?
Louvers there would result in inflow, not out. There is a large region of separated air in the zone at the back of the hood/base of windshield in all cars where you get a lot of "pressure recovery" (aero speak for the difference in surface static pressure versus the stagnation point total pressure on the front of the body (car in this case)). The recovery ratio is very high, over 90% in most cases, so that region is a fantastic location for cabin air inlets and engine induction inlets.

If you do anything with the hood, you have to vent it nearer the low surface pressure zone (high surface velocity) near the peak of its curvature up from the front. It's possible to vent radiator air out there as you'll see on many other cars (and some race cars). How that effects the remainder of the car's Cd and Cl is "an exercise for the student."

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post #68 of 90 Old 1st November 2017, 06:28 PM
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That's sick. So you can change the supercharger portion by unbolting? Is that person/place willing to make more?
@TheShafro , Mark's contact info, aka "Bulldoggee", who designed/built my pulley, is: [email protected]
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post #69 of 90 Old 3rd November 2017, 05:25 AM Thread Starter
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Almost done!

A few pics before we finish up!

Valve covers came out nice in matte red!
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post #70 of 90 Old 3rd November 2017, 05:27 AM Thread Starter
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