I will be receiving my turbo manifold very soon. Its identical to this one. I have read about expansion slots on the manifold that will help prevent cracking. I just wanted to make sure that this is where i should make the expansion slots.

See red lines


I figured just run a band saw through it.. that would be sufficient??? Am i on the right track?





[Modified by DIY_Racing, 4:15 PM 12/26/2002]

 

Where did you read about these 'expansion slots'?

 

they are there to relieve some stress from the expansion and contraction when it gets hot and cold. and that is the place i see them when they are on manifolds.

 

Yup one thing that will happen if you dont make expansion slots or if your bolt holes dont account for heat expansion, is as soon as the manifold flange expands it will shear all the bolts off of the block.

 

the problem actually occurs when the runners are made out of a material that expands more rapidly than the material that makes up the flange. In the case of the max rev manifold shown (at least thats what it looks like to me) the manifold's runners are made out of stainless and the flange is made out of mild steel. Stainless expands more rapidly than mild steel. Without the expansion slots the runners would be putting stress on the flange and cause it to warp when it gets hot.

Pretty sure thats the logic behind it. The manifold builders on here should comment on it too.

I decided to cut them in my manifold, I figured they can't hurt. I think a bandsaw would do the job just fine, and yes you marked them in the right spot





[Modified by racerxadam, 2:41 PM 12/26/2002]

 

FFGeoff put them in our manifold that he did for us.

 

My drag gen 2 has that also.

 

my maxrev has them

 

right, those are the correct locations and a bandsaw works just fine. u may have to surface the flange after its cut. sometimes when the runners are welded to the flange, the heat can warp/distort/stress it. during and after the cut the flange trys to return to its original position and the runners can become uneven. this only really happens when there are gaps that are filled between the flange and the runner. or u could just cut the slots around the bolt holes


[Modified by javierb14, 10:26 PM 12/26/2002]

 

Here I found a better pic:

 

thanks for stealing my picture

 

uhh, I took that pic in vegas..hehe

 

hehe, i carried that thing all over vegas

 

i was talking about the maxrev manifold up top. they guy that posted this thread jacked my photo.





[Modified by lilxvtecxpwr, 2:46 AM 12/27/2002]

 

Ok, so there should be three slots then?? all the way through.?? Or should i just slot the holes for the head only???

Getting mixed answers.. SOme say to cut where i drew, and some say to cut just the bolt holes.....

any more help??


And you have to be kidding me about the picture LILXVTECXPWR. If your gonna cry about me using your picture ill remove it.

 

where the hell are they on that mani..

 

You cut at the bolt holes

 

Out of curiosity, do cast mainfolds like the inline pro need to have slots cut as well?

 

i was wondering the same thing...?


chris

 

ok DIY you see where you have the middle red line? it is right in the middle of the bolt hole. cut all three right down the center! i am surprised a maxrev manifold was not cut. and the reason that the fullrace one is not cut is because it went to vegas not finnised. that was acctually the only thing that wasnt done to it, but i assure you it did get cut before shipping to a customer!

 

No, because its a cast stainless steel.

art

 

Should it be cut completly thru in all 3 positions?

 

yes, cut em all the way through. you want to do this for 1. to relieve stress created during welding and 2. to allow the manifold to "breathe". that is expand and contract at its own will. if the flange is not cut, the chance of a weld breaking goes up drastically. do yourself a favor and cut the flange

 

what is the difference b/w cutting down the middle like on the max-rev as opposed to cutting at every single hole like the full-race?

 

You should do both, and full race does do this. But the pic I have was one that had not yet been finished like ffgeon stated. They did infact finish the expansion slots on the manifold I have pics of.

art