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RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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#1 |
RCC Contributor
Join Date: Mar 2008
Posts: 505
Rep Power: 18 ![]() |
Are these exhaust gaskets reusable?
I'm thinking engine to manifold gasket is good to go but I'm wondering about the manifold to turbo gasket?
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#2 |
460Hp FullStreetport N/A
Join Date: Jan 2010
Location: Homestead, FL
Posts: 25
Rep Power: 0 ![]() |
i would order a new set bro
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[[Anti-Piston]] ;P ![]() |
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#3 | |
⊙⊙
Join Date: Dec 2009
Location: Great Falls
Posts: 1,258
Rep Power: 17 ![]() |
They do look rough. I would think you will have to over torque everything to get them to seal properly and the stock turbo mani is known for cracking.
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#4 |
RCC Addict
Join Date: Mar 2008
Location: Honolulu, Hawaii USA
Posts: 1,813
Rep Power: 19 ![]() |
Look good to me...
I wouldn't hesitate to reuse them. For the turbo -> engine, inspect the crimp edges around the exhaust port. Make sure there are no cracks or creases running radially. Look for signs of exhaust leaks - black marks that indicate exhaust gases are leaking past the gasket; it will look like a cone-shaped black mark most of the time. For the turbo -> turbo exhaust manifold, basically the same thing/ No cracks...no creases. Warped is okay, since it'll be clamped down during proper torquing of the fasteners. -Ted |
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#5 | |
RCC Contributor
Join Date: Mar 2008
Posts: 505
Rep Power: 18 ![]() |
Quote:
All the crimped edges look great. No cracks, no creases. I am concerned about some darkness on the engine to manifold gasket and also one crack on the exhaust manifold. Tomorrow I'll get some macro pics of the manifold crack. I'll post those in a new thread. It's getting close to extending beyond where the gasket starts sealing, but hasn't yet. I didn't have any problems with leaking while the car was a daily driver. I've got a second S5 manifold but it's in worse shape. Rather than spend on another 20yr old part I'd rather milk the life out of the one I have and use money later for an upgraded manifold. |
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#6 |
RCC Contributor
Join Date: Mar 2008
Posts: 505
Rep Power: 18 ![]() |
Turbo to downpipe gasket. I didn't store it properly and it got damaged. I'm thinking this isn't useable, but wanted some opinions.
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#7 | |
rotors excite me
Join Date: Mar 2008
Location: Iowa
Posts: 372
Rep Power: 18 ![]() |
if the only damage are those scratches ^^^ then it should still flatten out and seal pretty well. I don't see any cracks.
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He isn't a killer. He just wins -- thoroughly. ![]() ![]() '87 TII 240+ rwhp on my DIY streetport, ~13psi on stock turbo, Racing Beat REVTII exhaust ![]() rTek 2.1 awaits a tune Quote:
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#8 |
rotaryevolution.net
Join Date: Feb 2011
Location: Las Vegas, NV
Posts: 248
Rep Power: 15 ![]() |
they all look fine. the downpipe gasket will flatten out when torqued down.
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#9 |
RCC Contributor
Join Date: Mar 2008
Posts: 505
Rep Power: 18 ![]() |
No cracks, just the damaged area shown. Reusing saves me $70
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#10 |
I-had-a-bad-experience...
Join Date: Feb 2008
Location: M'boro
Posts: 1,046
Rep Power: 19 ![]() |
more like $150 for all three!
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'15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD |
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#11 |
RCC Contributor
Join Date: Mar 2008
Posts: 505
Rep Power: 18 ![]() |
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#12 | |
RCC Addict
Join Date: Mar 2008
Location: Honolulu, Hawaii USA
Posts: 1,813
Rep Power: 19 ![]() |
Quote:
This might seal initially, but I think it's going to fail prematurely down the road... This might be worth replacing at this point if you don't want to deal with it within a few months to about a year. The problem with this kinda damage is that the metal gets work hardened and will never go back to it's original (or preferred) shape. Since torque specs are not excessively high - I believe it's only like 30 lb-ft or close to that? - I doubt the fastener torque is enough to flatten it out totally. It'll be a different story if you're able to re-anneal the metal, but I doubt that's possible in this case. The problem with exhaust gas sealing gaskets is that if you give the exhaust gases just a tiny alternate path to escape, it will and will cause a bigger gap the more you run it. The gasket needs to have a perfect seal before running it with any miles or else it'll fail prematurely. -Ted |
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#13 | |
I-had-a-bad-experience...
Join Date: Feb 2008
Location: M'boro
Posts: 1,046
Rep Power: 19 ![]() |
Quote:
you are right. I priced mine through pineapple and they are close to $200 after shipping. I bought the manifold and turbo gaskets through them, and reusing the DP gasket. If it leaks, at least it will be much easier to change than the other two and you have the chance to save some $$
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'15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD |
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#14 | ||
RCC Contributor
Join Date: Mar 2008
Posts: 505
Rep Power: 18 ![]() |
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