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Note RUF's intake ducting in picture below:

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Originally Posted by zeb930 View Post
100% homemade.. Found the ducts at the local hardware store, I knew the placing was good from the nato-Ruf BTR car.

Would have made a similar tube version as the Ruf if I had the room but my full-bay IC made me do a narrow version.

If you decide to do a fresh air intake remember to make a couple of small holes in the bottom of the airboxlid for water evac.. And a lid for the tube if you expect to park it in extremely heavy rain/ washing




Old 09-26-2010, 02:26 PM
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This would be a nice kit to copy for ducting the IC and intake for a non A/C car. Note the air filter snorkel and block off plate at the grill:

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Originally Posted by zeb930 View Post
911st - voila.. WERK I - yes I believe it is PVC ventilation ducting..

Old 09-26-2010, 02:28 PM
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No, hot air should not enter the intake. Thorough ducting includes a cool air duct for the air filter housing.
Heated air from the intercooler will however be going into the engine fan and used to cool the cylinders.
I'm not a fan of misting or fluid injection on a street car. You need something robust and maintenance free for the long haul; a larger intercooler.
I am certain you will be surprised at the difference once the intercooler is properly shrouded and all the holes are plugged.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-26-2010, 02:32 PM
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Crotchety Old Bastard
 
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Keith, I would think that setup too restrictive as the footprint of the intercooler needs to be full bay to allow as much air to the engine fan as possible.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-26-2010, 02:35 PM
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If properly managed, The available inlet area in the engine lid can be used to both provide air flow thru the I/C core and support the cooling fan and induction system.

The solution is to provide a inlet ahead of the I/C so a percentage of the air flow will enter the top rear of the engine compartment on its way to the cooling fan,
This allows to air temp closer to ambient at the air cleaner inlet,

So the trick is not to close off all the engine lid (grille) area that is not over the I/C but rather provide other inlet areas as well so that we can manage the requirements of the other sub systems .
Old 09-26-2010, 02:44 PM
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Brian,

You may be right especially in reference to the stock 930 IC.

Check out what Porsche did on the C2 with no A/C condenser to work around. More like aerodyne is describing. They did however still limit the air intake side to a degree. My favorite is what Porsche did on the 993TT. That is closer to a full bay as you note. So good question.

The Andial half bay is closer to the RUF unit I suspect. I know Andial supplied it with some ducting to match.

RUF knows more than me. I am not 100% sure that the snorkel on the wide body 3.4 BTR is RUF but it sure looks like it.

I might add that Corky Bell say's that air flow over and around the end tanks and plumbing can show a measurable benefit and to not discount it.

In most cases the stock IC's are tube and fin and they are supposed to flow cooling air more efficiently through them than the aftermarket bar and plate. So I guess that could be another variable making the C2 intercooler more like a full bay in terms of restriction.

So who knows what is the perfect set up it and it probably varies depending on if it is a street or track car but it is fun to speculate and experiment.

I think we can agree that we do not want the intake air to be preheated by the intercooler or motor in any way or the intercooler will have to work harder to achieve the same exit temps. And, that we want as much air flow through and around the intercooler as possable.

Cool!
Old 09-26-2010, 04:07 PM
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Crotchety Old Bastard
 
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I do not want to get off topic but this is the solution I ended up with using a B&B half bay intercooler.
When all was closed off but the intercooler itself the cylinder head temps rose a bit. I then took out the shrouding at the back of the lid near the small filter atop the air meter assembly. That allowed air to enter right at the intake. Head temps were still higher than typical. That is a GT2 wing so I opened the dual snorkels on the sides and all was good.

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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-26-2010, 05:18 PM
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Makes sense.

You did what Aerodyn930 was saying and what Porsche did on the 91-94 C2 turbos.

Air will take the path of least resistance. If we restrict air flow to much at the grill it will get sucked in from other less desirable places like from under the car where the hot cooling air is expelled and the hot turbo and exhaust live. Thus, we should probably take note of post 17 & 18 here as to sealing our motor compartment.

Old 09-26-2010, 08:05 PM
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