Routing Ea81 Coolent lines after webber attn: TomRhere

[BobBrumby]

I am porting out an ea82 manifold for my webber and was hoping the get rid of the carb heater line, for hitachi autochoke, and the other one that goes to a barb on the t-stat housing. I was just wondering if these two lines cool the block at all because I was thinking about blocking the two barbs on the manifold and conecting the two barbs on the block together. Any thoughts?

 

Hey Tom I though your photo gallery is great. I read on one of your pictures that you need to cut a bit of the altinator bracket away, is this because the heater return pipe on the manifold hits it. Ifso could you cut the pipe shorter instead?

[TomRhere]

Sorry for the delay in getting back to you on this BB, been busy here, and I kinda over-looked this thread.. :-\

 

Yeah, you can pull the tube out of the T-stat housing, then drill-n-tap for a pipe plug. I'm also under the belief that one could loose the tube under the carb port also, and route the hoses as you stated. I would also have a local welder heli-arc the square shaped water passage at the carb mount of the manifold, then smooth things back down.

 

I appologize for the size of the text in that photobucket link. I didn't know it would come out so small, and that one isn't able to re-size it by downloading it to their system.

 

I can send you a full-size zip file of the write up if you would like it, just send me a PM with your email addy and I'll send it your way.

[GeneralDisorder]

A less expensive way (and it works good - many of us have done it) is to put a bit of screen into the hole, and fill it with JB weld. You can smooth it out before it dries, and it makes a really tough seal.

 

GD

[BobBrumby]

I have just about finished porting, on the water jacket side i have 3-3.5mm of surface, at the worst, for the gasket to seal. Note that this was a virgin manifold with only minor scraches I have made.

 

I took the head side of the manifold out to 35mm, jeez subaru really dropped the ball on the inside of this bend. All i can say now, is mine looks like a circle. The two extra depth ea82 carb stud nobs are nearly all gone except a ridge where the dremmel would not reach.

 

I have another ea81 big barrel manifold spare so I might post some comparison photos tomorow.

 

For anyone wanting to do the same i sugest you use the dremmel high speed steel shapers. The grinding stones clog up and never cut as well as the steel ones anyway.

 

Three questions:

3-3.5mm enough to hold back the coolent?

 

Like where should I expect power gains when I bolt it on?

 

Is the standard metric 12mm headed bolt fine or course threaded and what size hole?