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Donut Gasket

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Econoline
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Donut Gasket

Post #1 by Econoline » Sun Jun 23, 2019 5:33 pm

Which donut gasket do you prefer, the blue on or the silver sintered one? I keep getting a leak at the donut, I've been using the blue ones.
It ain't gonna fix itself

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chad
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Donut Gasket

Post #2 by chad » Sun Jun 23, 2019 7:27 pm

"Pic's wortha..."
I know U, U re-tq after a few heat/cool cycles, no?
I aint seen mine since the '80s so don't be mambah...
Use the other this time?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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Econoline
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Re: Donut Gasket

Post #3 by Econoline » Sun Jun 23, 2019 8:59 pm

I'm wondering if people have had better success with one or the other. I don't know why I'm having this problem other than maybe my flange on the pipe side isn't formed right. I added a bracket/strap welded to the head pipe that bolts the head pipe to the block when I redid my exhaust last year. I'm going to add a 4" long flex section in after the o2 bung when I pull it apart next time to have the head milled.
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chad
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Donut Gasket

Post #4 by chad » Mon Jun 24, 2019 1:01 am

U have the cast oe exh mani, correct?
Is there any distortion where the donut goes?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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Econoline
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Re: Donut Gasket

Post #5 by Econoline » Mon Jun 24, 2019 12:17 pm

Yes and the seal area is good.

I think I have found my answer, according to felpro support the silver ones are better.

https://www.felpro-only.com/break_room_forum/showthread.php?tid=2268
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Re: Donut Gasket

Post #6 by rbohm » Mon Jun 24, 2019 2:29 pm

i have had failures with the silver gaskets as well, but then my manifold is cracked all to heck so i need to replace it. when that time comes i will probably also use a high temp sealer with the donut gasket.
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Econoline
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Re: Donut Gasket

Post #7 by Econoline » Tue Jun 25, 2019 9:16 pm

I'm going to try the silver sintered metal one. I can tell by looking at the head pipe flange it isn't "perfect" but it looks like it should seal and it does for 500-1000 miles with the blue ones. I'll let you know. I'm going to dbl check the geometry at the mating surface. When I welded on the block strap I had it torqued up with an old gasket, maybe it's not quite congruent. It's going to be a while but I'll let y'all know how it goes.
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bubba22349
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Re: Donut Gasket

Post #8 by bubba22349 » Tue Jun 25, 2019 9:23 pm

How's the exhaust pipe flange of the head pipe is it still in good shape? The donut needs to have support on the inside part of it going into the exhaust manifold. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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Econoline
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Re: Donut Gasket

Post #9 by Econoline » Tue Jun 25, 2019 9:33 pm

It was newly formed when I put it in a couple thousand miles ago. It's a little off but it has the inner portion. It's the right flange, like a dbl flare formed with a bit of pipe left on the end to support the inner portion of the seal. I wasn't clear about that, it's not just a flare or dbl flare.
Last edited by Econoline on Tue Jun 25, 2019 9:40 pm, edited 1 time in total.
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bubba22349
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Re: Donut Gasket

Post #10 by bubba22349 » Tue Jun 25, 2019 9:37 pm

:beer: ok that's good then, I have had old head pipes that the inside part was missing a section of it and couldn't make the donut last very long until I replaced the end with a new section. The donut should fit fairly snug onto the inter section of the head pipe. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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Econoline
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Re: Donut Gasket

Post #11 by Econoline » Tue Jun 25, 2019 9:42 pm

Thanks. I'm on my 3rd donut since I changed the exhaust out and it's recently started leaking again... :bang:
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Re: Donut Gasket

Post #12 by bubba22349 » Tue Jun 25, 2019 9:50 pm

:wow: :bang: that's not great having to change them out so often hope it's lasts this time! :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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Re: Donut Gasket

Post #13 by drag-200stang » Tue Jun 25, 2019 10:24 pm

I think that a torque strap would help by keeping the motor from moving around a lot , stressing the joint.
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best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
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chad
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Tq strap

Post #14 by chad » Wed Jun 26, 2019 1:17 am

Gene just made up one for the Mav...
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

drag-200stang
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Re: Tq strap

Post #15 by drag-200stang » Wed Jun 26, 2019 8:46 am

chad wrote:Gene just made up one for the Mav...

And a fine one at that. :thumbup:
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

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Re: Donut Gasket

Post #16 by wsa111 » Wed Jun 26, 2019 12:31 pm

There should be a bracket on the headpipe that bolts to the lower part of the block & that will prevent movement at the donut ring.
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