Ever Tried This To Your Manifold...
 

http://www.full-race.com/catalog_ima...anifold_11.jpg


I have a slight warp in my head flange and I could PROBABLY draw it in or at worse hit it Joseph Davis style with the belt sander. However, I saw this and never understood it until now. Making relief cuts on the in between exhaust ports to acutally make EACH port seal to its own. I personally think it will work better this way and will prevent any kind of heat warpage exhaust leak later on. Before I go grab the Metabo, what do you guys think?


Next, I saw my exhaust ports are smaller and all carboned up. Any benefit, not benefit, worthy my time and skill to grab an airtank attachment and clean it up or maybe even port them a little? Or should I say forget it and leave this for another day or person?


Thanks alot, fellas!!! ;) ;D


JP

Re: Ever Tried This To Your Manifold...
 

if you vcut a manifold flange thats already welded like yours, the bolt holes and ports will releave themselves and youll never get that manifold on the car again.

you need to cut the flange and bolt it down them weld it. i would go belt sander style rather than cut it

Re: Ever Tried This To Your Manifold...
 

Both Peter and I did that to our log manifolds. It's good to relieve stress and it's so simple. I would say do both. Throw the belt sander at it, then get someone with a bandsaw to cut those reliefs in it.

Re: Ever Tried This To Your Manifold...
 

V-Cut? I don't quite understand what you mean. :-\ Sorry.


Thanks for both opinions, buts it's a 1-1 toss up. Sounds like belt sander with maybe a side order of SawZaw.


I have the standard internal WG SS log mani with mild steel flanges if this changes anything.


JP

Re: Ever Tried This To Your Manifold...
 

Yeah we both cut after it was welded, didnt even hit it with the belt sander. shits mint no leaks :6

Re: Ever Tried This To Your Manifold...
 

Seals each port to each its own right? So I should cut inbetween like shown in the pic and I'm straight? Might try it with the old gasket today.


Now, anyone about my 2nd question?


JP

Re: Ever Tried This To Your Manifold...
 

yes sir. dont bother with the carbon

Re: Ever Tried This To Your Manifold...
 

Okay, thank you. :) Dad is leary on the cutting of the head flange. Why? I do not know. He must think a $1300 manifold design by full-race is poopy. ::)


JP

Re: Ever Tried This To Your Manifold...
 

i would surface the manifold before you cut it. cutting it will only make it shift and itll most likely be worse. ive done it before and ill never cut another one again.

Re: Ever Tried This To Your Manifold...
 

This is the nicest you've EVER been to me. Thanks for the genuine help, Josh. :y (and others) It's getting resurfaced as we speak. The cutting is up in the air.


JP

Re: Ever Tried This To Your Manifold...
 

i think your a penis mouth, but i cant see you ruin a manifold thats silly.

Re: Ever Tried This To Your Manifold...
 

I cut mine for my D-series.

I also cut my headers for my 350. The 350 is especially nice b/c you don't have to cut any bolt holes, so the 3 sets of ports all seal by themselves relatively independently.

Re: Ever Tried This To Your Manifold...
 

cray your gay you dont count.

Re: Ever Tried This To Your Manifold...
 

I had a leak.

Cut it.

Leak gone.

Re: Ever Tried This To Your Manifold...
 

I'm REALLY considering doing this now.


I looked at my exhaust gasket and noticed in the 2 upper furthest corners that exhaust was leaking out. The head flange was shaved JUST BEFORE, and it still leaked. I'm really suspicious now.


JP

Re: Ever Tried This To Your Manifold...
 

samson your a pssy. i hate you

Re: Ever Tried This To Your Manifold...
 

surfacing will be fine, since its already welded up just do that and don't bother with cutting.

Re: Ever Tried This To Your Manifold...
 

We cut all of ours after the manifolds were welded.

Cutting it will help it seal better. End of story.

Re: Ever Tried This To Your Manifold...
 

What?



It was surfaced before and I pulled it to have a crack welded up and noticed a leak on the gasket. So it looks as if it warped while on the head. :-\

I want to cut it and I think it WILL seal better too Snafu.


JP

Re: Ever Tried This To Your Manifold...
 

it says to cut them in maximum boost. but like josh said, you cant cut it after its welded

Re: Ever Tried This To Your Manifold...
 

what, a Metabo but no Bridgeport?

Re: Ever Tried This To Your Manifold...
 

Did you ever retorque the nuts after the initial time the manifold was on? Also did you take the manifold off while it was still warm? How thick is the head flange? If you had an angle grinder and nice cut off wheel, im sure you could make those cut rather easily to relieve the stress.

Re: Ever Tried This To Your Manifold...
 

No, I don't recall retightening them. Manual says 23lbs which seems really low to me. May have taken it off still warm. I was sick this week so my Dad drove 1 mile to spend under an hour taking it off. He said it was pretty hot, but it is exactly a 1 mile drive then what; 20 min removal? We have the Metabo and cutting wheels I KNOW that will get the job done well. Thanks Mike. :y


Any kind of warpage while on the car maybe; from the upper outermost corners where exhaust leaked as we could tell on the gasket? Cylinders 2 and 3 had a decent amount of bluing around the ports also. I don't rape hard or boost in 5th and my tune is more rich than lean for sure. Just seems odd it's getting SO hot it seems there and warping it. :-\


JP

Re: Ever Tried This To Your Manifold...
 

says who? i did :6

Re: Ever Tried This To Your Manifold...
 

Ended up not cutting the head flange. If we have this problem again it gets the cut for sure, but we cleaned the surfaces REALLY good and then ripped on it. Seems to be building boost well and holding. Doesn't look like we have the 5+ leaks anymore. :o Thanks for all the help guys.


JP