Leaky EMi manifolds
 

anyone have problems with them leakin like a biotch? I'm thinking about welding shut the water passages at the riser and going to dry stacks.

Re: Leaky EMi manifolds
 

Dyno- I feel you pain. I had my leaking mpi manifold off 3 times before I figured out the REAL problem. On my manifold, the brass insert stuck out a little farther than the matting surface of the manifold. To check, lay a GOOD staight edge across the mating surface so one end rests on the brass portion. You should not be able to see much daylight under the straightedge.
On mine, there was so much daylight that the brass was the only part contacting the gasket and every time I would torque the bolts, the brass would cut thru/displace the gasket right around the water passage.
Very carefully, take a good file and lower the brass until it is flush with the surrounding aluminium. Best done by a machinist I guess but the file worked for me. Hasn't leaked since. Hope that helps.

Re: Leaky EMi manifolds
 

maybe I should read these posts better before I reply. I see now that you meant exhaust manifold...not intake manifold. But maybe it will help someone else.

Re: Leaky EMi manifolds
 

Dyno

Are they leaking at the joint beween the manifold and the riser?

Re: Leaky EMi manifolds
 

Thats the guess right now...I replace the gasket every spring and still have problems....

Re: Leaky EMi manifolds
 

been down that road before. weld up the passages they are not needed with the ss risers. those passages are there for the stock type risers that don't use a jumper hose. i've seen quite a few water leaks on emi exhaust & i'm going to spend more for better quality in the future.

Re: Leaky EMi manifolds
 

Ditto what Vette said...I had a gasket actually blow out to the interior on the exhaust passage and chocolate milked my engine/ scrubbed my cam over a damn $5 part!. The crossover passages aren't needed on my 4" risers as they have an external water hose to carry h2o from manifold to riser. I actually high temp RTV'd mine closed and compressed with a SOLID gasket (not cut outs for water provision) and clamped with the riser. Been fine ever since. BAD design from EMI. If they need these passages for their other risers, they should make a kit to eliminate this problem with the 4" Stainless riser...

Re: Leaky EMi manifolds
 

Fred I've been running them for a few years now I doubt if they will do anything

Re: Leaky EMi manifolds
 

dyno.. call EMI, they will sell you solid gaskets that will cover up the water passages. Then you just have to run a external jumper hose from manifold to riser. Most of the EMI's the last few years have no water passages in the manifold anymore, all use jumper hoses I beleive.

Re: Leaky EMi manifolds
 

Dyno buy lightenings and let me have the EMIs.....D