Do I need a new gasket if changing over the headers?

[pan]

I've got my newer headers off MacBusa (with stainless mid pipes) and was wondering if I'll need to buy a gasket off Suzuki to do the swap...
"sometimes crime does pay"<i></i>

[Volvi]

i didnt when I had them on and off a few times, theyre just a metal plate not rubber, cleaned them up. but see what others have to say too i guess. <i></i>

[MacBusa]

"she'll be right" New Page 1RegardGrantKing of Stealth Blingwww.blingpartsaustralia.com.au<i></i>

[Blackzook]

Pan,
They are a crush fit gasket one for each header. If yours are crushed or deformed then swap em out. I reused mine when I fitted the pipes but later swapped to new ones next time I had them off. Gaskets are very cheap so its up to you.

Bruce
N2O no laughing matter
<i></i>

[pan]

"One for each header"... so I need 4 separate pieces?

As you know I don't mind spending money on after-market shocks, performance, safety or chrome bits, but I hate paying Suzuki anything, so I was hoping I didn't need OEM spares... but I'll temporarily take the big chip off my shoulder and go in to buy the gaskets... <i></i>

[Tech Doctor]

Yep, you need 4 of 'em. Cheap as hell though. If you do use the old gaskets, just make sure they seal as tight as hell. If gasses can get in or out past them, you can burn the exhaust valve from excessive temps.

Tech. <i></i>

[gazza414]

Can you explain the reasoning behind burnt exhaust valves? due to a gasket leak? <i></i>

[Tech Doctor]

Unburnt fuel in the exhaust gasses is unavoidable with any internal combustion engine. The leaner a motor runs, the hotter the combustion. When the exhaust valve opens and the gasses start to exit, combustion is still occuring in the exhaust port and the start of the headers. Any fresh air that can seep past the gasket will make the combustion lean, and therefore hotter which can lead to excessive temps, and therefore burnt exhaust valves.

Some of you will now be thinking that it can be right because there is pressure in the exhaust port and headers so gasses could only seep out and not in. Wrong. when the exhaust valve closes, another opens on another cylinder. This will cause a slight vacuum within the headers and exhaust port that has just closed. With the vacuum, gasses can seep past the gasket (exhaust scavenging).

Another thing the exhaust gassses which just exited are traveling at a decent velocity, so when the valve close, it will create a vacuum inside the head. This is another way of gasses being pulled into the head.

Any clearer? If you have any questions, just keep posting until we get it all covered.

Tech. <i></i>

[Speedzalot]

Perfectly clear


Arguing with idiots is like wrestling a pig in the mud, you both get dirty but the pig enjoys it!<i></i>

[gazza414]

and very muddy...

I have an exhaust manifold here that has factory fittings for air to be pumped into the exhaust....you might remember ..air pumps were factory standard on some cars in the 1980's <i></i>

[fasterfaster1]

Gazza is that like a PAIR system ...............without the Pump !
I reckon the worst thing was when they put cats in the exhaust ..................... I still can't stop my dog barking at them
FF1
<i></i>

[Fat Busa Racing 1347]

Quote:I still can't stop my dog barking at them


man that shits FARKING funny
Regards Richard

“Racing is living, everything else is just waiting” <i></i>

[RaZ80]

very good tech I learnt something tonight & will be making sure mine are nice & tight "Busa riders always count in three's.... 100, 200, 300"

<i></i>

[Tech Doctor]

I have an exhaust manifold here that has factory fittings for air to be pumped into the exhaust....you might remember ..air pumps were factory standard on some cars in the 1980's

I know what you are talking about. These helped burn unburn't hydrocarbons, but the injection point isn't a sclost to the exhaust valve as the headder gasket. This helped keep excessive temps away from the valve's.

Tech. <i></i>

[gazza414]

at where the air injection is on the std Busa head..you might want to reconsider . <i></i>