Motordyne Spacer Users
10-17-2018, 08:04 PM
#1
New Member
Thread Starter
Motordyne Spacer Users
Hey anyone with the Motordyne spacer I want to ask you to do a test to see if anyone else has the same problem I had with mine. I added a oil catch can to my car so I removed the upper plenum to clean out all the pools of oil that collect in the lower half. I installed new plastic spacers that get installed on the six center bolts. After going through the correct torquing sequence I started the car and immediately could hear air being sucked past the six center bolts. After that I could no longer hear air leaking but found that if I pressed my palm against the pocket of each bolt, I could feel a vacuum pulling on my skin. I ended up purchasing bonded washers Like the Z1 spacer kit uses to solve the problem.
Here is the test . Take a cup of water and fill the six fastener pockets at the center of the intake, then start the car and see if the water disappears. If it does you have a small vacuum leak you didn't know about.
Here is the test . Take a cup of water and fill the six fastener pockets at the center of the intake, then start the car and see if the water disappears. If it does you have a small vacuum leak you didn't know about.
10-18-2018, 12:04 PM
#3
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Last edited by Rick*K; 10-18-2018 at 12:08 PM.
10-18-2018, 12:49 PM
#5
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Because it is readily available and creates no problems with the engine. Ever hear of water injection? Some people have even sprayed a mist of water into their intake with the engine running to steam clean the cylinders.
10-18-2018, 03:42 PM
#6
350Z-holic
iTrader: (13)
water? How about some brake cleaner instead
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10-18-2018, 04:42 PM
#8
Registered User
When i ran the 5/16 MD spacer years ago, i put a small amount of RTV underneath the washer that was with the six middle long 10mm bolts to maintain an airtight seal. I even put rtv in between the spacer and top/bottom plenum for safe measure. Way too many spots for a vaccum/boost leak with the oem plenum.
10-18-2018, 04:44 PM
#9
350Z-holic
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I welded mine shut after I cut the 6 towers out...
10-18-2018, 04:50 PM
#10
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I installed brand new spacers when I reassembled my plenum just to make sure they would seal and theoretically they should. As I mentioned I never would have known they were not sealing completely if I had not pressed my hand over each bolt pocket and felt the leaks.
10-18-2018, 04:53 PM
#12
Registered User
Its good that you shared your experience. Because i bet my kidney that folks are driving around right now with a plenum spacer they installed themselves and have a vacuum leak they are unaware of.
10-18-2018, 11:04 PM
#13
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