motordyne 1/2 iso therm spacer
#1
#2
I think you need 5/16 to keep the engine cover.
I have the 3/8" on mine and I was barely BAAARELY able to get the engine cover on. It's actually touching the plenum and ever-so-slightly bowed as a result of touching the plenum with the spacer on there.
With the 1/2" spacer, you will definitely not be able to use the cover, unless your car is newer and maybe they redesigned the engine cover since then.
You don't get much of a difference anyways from the 5/16 to the 1/2", so if you really care about the engine cover... just get the 5/16".
I have the 3/8" on mine and I was barely BAAARELY able to get the engine cover on. It's actually touching the plenum and ever-so-slightly bowed as a result of touching the plenum with the spacer on there.
With the 1/2" spacer, you will definitely not be able to use the cover, unless your car is newer and maybe they redesigned the engine cover since then.
You don't get much of a difference anyways from the 5/16 to the 1/2", so if you really care about the engine cover... just get the 5/16".
#4
#5
#6
My setup is just like partyman's.....I have the 3/8" MD spacer and could barely get my engine cover to fit without slightly touching the liner inside the hood. I had to remove the rubber blocks on the underside of the engine cover AND flip the 4 grommets that the engine cover screws pass through in order to get it to not rub....
I also had to use some silver touch up paint on the engine cover to try and mask the rub mark.![Frown](https://g35driver.com/forums/images/smilies/frown.gif)
....so since the 1/2" inch is thicker than the 3/8", you'll def rub with it (like the others have said) so go with the 5/16".
![Big Grin](https://g35driver.com/forums/images/smilies/biggrin.gif)
I also had to use some silver touch up paint on the engine cover to try and mask the rub mark.
![Frown](https://g35driver.com/forums/images/smilies/frown.gif)
....so since the 1/2" inch is thicker than the 3/8", you'll def rub with it (like the others have said) so go with the 5/16".
#7
Originally Posted by G35fromPA
1/2" will only give you 1-3 more peak HP, while the 5/16" gives you more usable power across the mid powerband. Unless you're doing a lot of high RPM driving, just go with the 5/16" and call it a day.
Last edited by partyman66; 05-30-2008 at 05:41 PM.
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