61x FP manifold on 62t cylinder- drilling manifold vs. Timeserts/Helicoils

[JustinB]

I have seen pros and cons for both. This is my first experience with this and I need a little insight. I can order the same Timeserts that come from FP at Fastenal; but I am not sure how long they will take to get here. So I was looking at the Helicoil type inserts. If i use these, can I just screw in the one sized for a M10 hole and screw the M8 bolt into it? Or do I have to tap the hole for the insert? I read lots of posts where people say to simply put the helicoil in; but the info for them says you have to use their tap.

So why not drill the manifold? I read some say they have leaking issues and others with none.

At this point I am leaning towards drilling the manifold out.

 

[kevbo]

As far as I can tell FP modifies their 61X manifold by drilling the holes and cutting the port.

 

[JustinB]

As far as I can tell FP modifies their 61X manifold by drilling the holes and cutting the port.

And I did a little more research and it looks like I would have to use two 8mm bolts (with inserts) on the top center holes of the manifold even if I had the proper 62t manifold. So just drilling out the holes wont make it fit.

 

[200%Absolut]

just put helicoils. the 2 hiddens bolt will be easier to torque.

 

[#ZERO]

Use the heli-coil inserts for the bolt holes and fill the cylinder's exhaust port roof with ultra high temp stainless epoxy so you can keep your existing B-pipe exhaust manifold unmodified.

 

[nightrider05]

I just simply screwed helicoils in the hole..didn't use any type of loctite or anything. This manifold has been off and on 2 times now and it has held torque just fine both times.

The helicoils were cheap and worked perfectly.

 

[jetskidude1113]

Helicoils or Timesert? I believe TimeSert will screw right into the M10 X 1.25 hole, will the Helicoil do the same or do you have to drill and tap? also, do you guys use stainless or carbon steel insert.
Thanks,

 

[Storbeck]

I've done it with helicoils, screw right into the stock hole. I used locktite on the helicoils but not on the 8mm bolts with the idea that I want the helicoils to stay in the hole and not come back out with the bolts, but you would probably be fine with no locktite.

 

[Storbeck]

Use the heli-coil inserts for the bolt holes and fill the cylinder's exhaust port roof with ultra high temp stainless epoxy so you can keep your existing B-pipe exhaust manifold unmodified.

What epoxy did you use and how long has it lasted? I'm surprised there is anything that holds up to exhaust heat but that could be a handy thing to know about.

 

[augustaf]

I've always just matched (ground) the 61x port openings to a 62t gasket, no epoxy needed.....

 

[Storbeck]

For what it's worth I think @JetManiac has gaskets with a 62t shaped port but 8mm bolt holes, so I used one of those and opened up the manifold to match.