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Join Date: Feb 2018
Posts: 2
3.4 swap in track car - Motorsports AOS fitment issue

Hi all,

I did a 3.4L engine swap last year on my 986 (1999 3.4L into my 1999 986) and I recently discovered at my first test day (Big Willow in SoCal) that the car suffers from the dreaded white smoke plume after high-g turns (T2 & T8/9). I was black flagged after only 3 laps and my day was done before I could even get heat into the Nitto NT-01s.

The car went back to my trusted mechanic and I did extensive research on the topic. After hours of reading, I ordered the 0.5 qt LN sump extension, X-51 baffle, 997 oil return tubes, and the motorsports AOS. I opted to go with the smaller sump extension since the 3.4L engine already sits 1" lower than the original 2.5L due to the spacers required for the 3.4L intake stack to fit in the engine bay. I don't have the space below the car for the 2qt sump to hang an additional 1" below the already-low 3.4L.

Now that all the parts have arrived and the installations have begun, my mechanic is telling me that the motorsports AOS will not fit for two reasons:

First, the 3.4L 996 engines have a differently shaped AOS than the 3.6 engines so they are not plug and play. My understanding is that custom hoses must be made in order for this to fit.

Second, even if the custom hoses could be made, when the intake is rotated 180 degrees (as is required on the 996 engine to fit the 986 intake layout), there is no longer space to install the larger motorsports AOS.

Does anyone have any advice or experience dealing with this motorsports AOS issue on the 3.4L 996 engine when installed in a 986? Or are there any other ideas I'm missing?

Lastly, if anyone from SoCal is going, I will be up at Willow again this Friday with POC to dyno the car for GT classification.

Thank You all in advance.


Marc Jannone
Old 02-07-2018, 11:13 PM
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