smitty1001

My Feedback: (29)

Has anyone ever had this problem? I haven't flown the plane yet b/c the header bolts break from the vibration during taxi. I am using a JMP tuned pipe and the header that comes with it. Is there another way to secure the pipe to the engine using the stock OS header? (it lacks the hole for the retaining clip bolt)

Thanks in advance!


James

ZERODOWN

My Feedback: (4)

Is the engine mounted directly to firewall. If not sometimes rubber mounts cause my bolts to break because there is more vibration with no where to go.

Thud_Driver

My Feedback: (1)

In 12 years of trying just about every possible way of keeping pipes and headers together, I've only found one way that works for me for more than a couple flights.

Go buy the Violet pipe collar with retaining wire ~ $25-$30. Worth every penny. Use the OS header and 2 Viton (Black) or 2 Silicon (Orange) #116 o-rings. I usually take a flat needle file and clean up the o-ring groove on the header which allows the o-rings to seat just a little better. It will be a little difficult to slip the pipe over the o-rings but some vaseline or white lube will get it. Then tighten the retaining wire and collar to hold it in tension. Loctite the header bolts. Throw the OS o-ring away. It erodes and gets smaller each flight. This arrangement gets around 30-40 flights per o-ring set.

The big baseball bat JMP pipe needs to be hung so that the pipe hangar carrys the entire weight of the pipe at the pipe Cg, i.e.; balanced. Otherwise it vibrates and breaks things like header bolts or the pipe itself.

On another note, I prefer the standard Violet pipe for whatever that's worth.

Good luck!

ZERODOWN

My Feedback: (4)

sorry forgot it was a jet. I have the same set up in my starfire and had no problems

SKYPILOT

My Feedback: (9)

hi james,

we can probably help you out, but if you could provide us with a few more details, ie, the specific set up, fan type, is the header a jmp header, the one with the large orange bumper/heat seal, and the steel hook that bolts, to the top of the header .

the jmp system correctly set up with a dynamax fan/os91 is what we recamend for all yellow a/c d/f jets .

other combos. will surely work, but allways seem to have a much higher level of vibration .

Terry Holston

My Feedback: (1)

Check www.tgajets.com ......

They have a pipe retainer simular to BVM's that uses a wire held in place with setscrews instead of a strap with holes drilled in it. A little less expensive ,too.

I substitute a piece of 1/16" steel cable for the wire, makes it easy to pull tight. Balance the Pipe as stated above, and I have never lost a pipe.

Good luck,

smitty1001

My Feedback: (29)

I try some of these suggestions and then get back!!

James

Danger38

I had the same problem with the screws always comming lose on the header it happen with the ya/F-18 and the JHH F-4,i used the angle header and the bolts would not stay tight so my friend took my engine body to the machine shop and had steel insert put in and that fixed my problem. Hope this help.

Danger38 Out

Shaun Evans

Smitty,

Are you sure your pipe hanger is intact? Sometimes it breaks, then the pipe is just hanging on the header bolts. Also, I use double split washers on the bolts, and I haven't had them come loose since. Good luck.

smitty1001

My Feedback: (29)

The pipe hanger is intact. I will try the washers. "double split washers"? Particular brand or does it matter?

The good news is that I ran the engine today for 15 minutes or so and everything still seems OK. Maybe the original bolt was a little "soft" or something ?!?!

Smitty