Plenum Gasket Question.
#1
Plenum Gasket Question.
I haven't been hanging around the 2nd gen section lately, but the plenum gasket on my father's 98 1500 is def. bad. I know most people used to say that the Hughes Plenum Plate and a Felpro gasket with no sealer seemed to do the best. Is this still true? What about the gasket that Hughes supplies?
#2
Hughes is definately an upgrade . The aluminum plate matches the intake , therefore , the same expansion rates between the 2 , different from the stock set up , steel/alum. . There is a solution to the problem , use a small bead of anaerobic gasket maker on both sides of the felpro gasket . This gasket maker remains plyable and is for this purpose , to bond two different metals . I've used this sucessfully for over 1 yr of some very demanding driving in my 5.2 Jeep . I test the plenum occasionally (paranoid) but it's always good . .
There always avoid a plate all together and get the M-1 intake .
Realistically , hughes is proven to be a great never have to touch it again solution , you won't go wrong this way .
Torque to spec is critical , take your time , use 2 cans of Mopar combustion chamber cleaner and a tooth brush to clean the plenum , make it look like the pic . If you don't mind replacing the injecter seals , you can take off a little around the injecters to get a better more unrestricted flow easily with a dremmel or die grinder , you'll see where to trim , if you like that is . Make sure the intake set has the rubber ends for the intake gasket .
As for the hughes gasket , use it . If instructed to go dry , do so , if not , use the gasket maker I suggested above , it's the best IMO
There always avoid a plate all together and get the M-1 intake .
Realistically , hughes is proven to be a great never have to touch it again solution , you won't go wrong this way .
Torque to spec is critical , take your time , use 2 cans of Mopar combustion chamber cleaner and a tooth brush to clean the plenum , make it look like the pic . If you don't mind replacing the injecter seals , you can take off a little around the injecters to get a better more unrestricted flow easily with a dremmel or die grinder , you'll see where to trim , if you like that is . Make sure the intake set has the rubber ends for the intake gasket .
As for the hughes gasket , use it . If instructed to go dry , do so , if not , use the gasket maker I suggested above , it's the best IMO
Last edited by onegoodmason; 07-26-2009 at 02:02 PM.
#4
The Hughes kit instructs not to use any kind of sealant or substance on the gasket. The gasket the Hughes kit supplies may do the job, I don't know for sure, but it sure looked wimpy to me. I used the Felpro gasket, proven that it works well, looks a lot more like a proper gasket than the Hughes unit. Cleaned my filter the other day, looked into the intake out of curiosity. So clean in there you could eat off of it.
#6
The Hughes kit instructs not to use any kind of sealant or substance on the gasket. The gasket the Hughes kit supplies may do the job, I don't know for sure, but it sure looked wimpy to me. I used the Felpro gasket, proven that it works well, looks a lot more like a proper gasket than the Hughes unit. Cleaned my filter the other day, looked into the intake out of curiosity. So clean in there you could eat off of it.
#7
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#8
Yeah, I am. V8 plenums has to be on the top 10 list of things discussed often in here and easily answered by doing a search. Look at the post after yours. A question that has been answered a hundred times already. So, now we have yet another plenum thread cluttering up the place. Along with the half dozen A/C threads currently on pages 1-2. It's always better to post to an existing related thread rather than start a new one. That's basic forum etiquette.
#10
Here's how it's fixed : http://www.jeepsunlimited.com/forums...d.php?t=461371