so i have a HF manni and a T25 turbo, and for some reason its just not sealing too good with just the bolts holding it everything together, so i thought i could some how find 3/4 in thick plate of cast iron and just weld the bastards together instead of just using bolts how does that sound or would i be better of just trying the hi temp sealant that i've heard will just melt and creat a good seal between the adaptor plate and the manni and the turbo??

 

if you use the bolts to hold it on then you dont even need to worry about good penitration just make sure it is sealed

 

I have the same problem, but I forgot to put the gasket on the bottom of the hf mani. You can get one at your honda dealer for like $12 or something.

 

I tried welding an old steel adapter to a cast hf manifold, and trust me...don't even bother. Even with an arc welder with some heavy duty rods the welds still broke and leaked like crazy, not to mention warped the turbo mounting surface from the heat. Try doubling the gaskets if you have to.

 

ive welded quite a few things to hf manifolds and everything has held

Beau

 

I bet you used a torch to heat the cast iron first no?

 

I would try making a thin metal gasket first. That is the cheapest way. Just use a soda can.

 

have have done it too...and no...but after a while of welding on it, that mother was hot

 

Even heating with the torch, the welds would hold for a little while, but eventually would end up cracking on me. Bad penetration for some reason i guess.