Just completed 3.6 swap into 986 and have vibration. - 986 Forum - The Community for Porsche Boxster & Cayman Owners

BYprodriver · 01-30-2016, 11:18 AM

Are the 993TT mounts solid or hydraulic ? Did you have the engine &/or flywheel balanced? What year 986?

BYprodriver · 01-31-2016, 09:03 AM

Quote:

Originally Posted by BYprodriver

Are the 993TT mounts solid or hydraulic ? Did you have the engine &/or flywheel balanced? What year 986?

996 dual-mass flywheel is different from 986 & none of them are precision balanced so that is probably the main source of the vibration, non-stock engine mounts amplifies it further.

pkp4911 · 02-01-2016, 07:38 AM

Quote:

Originally Posted by BYprodriver

996 dual-mass flywheel is different from 986 & none of them are precision balanced so that is probably the main source of the vibration, non-stock engine mounts amplifies it further.

So prodriver, you are saying I should have gone with the 996 flywheel , vs using the existing FW which was already in car? I had the 986 FW resurfaced as it was in excellent condition.

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pkp4911 · 01-31-2016, 10:37 AM

Quote:

Originally Posted by BYprodriver

Are the 993TT mounts solid or hydraulic ? Did you have the engine &/or flywheel balanced? What year 986?

Ironically, the mounts I replaced ended up being exactly what came out. This 03 had a previous 3.2 exchange (this being 3rd engine now...) so motor had been out by PO. I was surprised and bummed since I bought the replacement mounts thinking it was an upgrade. They were used but perfect.
Clutch and PP were Sachs units. Flywheel was resurfaced but not dynamically balanced as a unit because I wasn't going with anything lightened or changed from OE.
While we shimmed (lowered ) engine and rear trans mounts I don't know that we did same for front engine mount which might cause some of this, since as I mentioned, I can actually feel vibration in the steering wheel...tied to pump being in contact with something towards front of engine...
Pedro mentioned that the Vertex oil pump galley (allowing some oil to go to IMS through hollow shaft) mod tended to cause a noise, but nothing about vibration.

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