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Location:
Newcastle, Hunter Valley
Registered:
January 2004
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Running an engine without exhaust?
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Thu, 01 April 2004 01:54
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If u run your engine with no exhaust and extractors, just bare exhaust side, will this cause damage? in any way
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Registered:
March 2004
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 02:28
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Your overlap won't match and you will probably run lean and hot. BMEP will drop. Expect burnt valves if you do it for extended periods.
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Location:
Brisbane
Registered:
July 2002
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 02:59
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| Chas wrote on Thu, 01 April 2004 12:28 |
Your overlap won't match and you will probably run lean and hot. BMEP will drop. Expect burnt valves if you do it for extended periods.
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Not to mention deaf ears unless you keep it below 3 kph ...
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Location:
Brisbane
Registered:
May 2002
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 04:09
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Not to mention your engine bay will probably catch fire! 
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Location:
Rocklea qld
Registered:
February 2003
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 05:30
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Burnt valves here u come.
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Location:
Newcastle, Hunter Valley
Registered:
January 2004
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 06:29
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how long running would it take to get burnt valves?
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Location:
Brisbane
Registered:
August 2003
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 07:31
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I would also like to know about this. I've got my primaries hooked up, but until I get it to an exhaust shop, I can't hook the rest up. I plan to get it towed there, but I need to get it onto the back of the truck first.
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Registered:
March 2004
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 07:54
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Your primaries should create the required reversion, refaction and syphoning if they have been sized correctly. The collectors and secondary pipes are only a flue, although they too should create enough velocity to keep the gas hot and flowing.
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Location:
Newcastle, Hunter Valley
Registered:
January 2004
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Location:
Melbourne
Registered:
May 2002
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 08:06
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Apart from sounding really cool and the most awesome noise your engine will ever make, you'll have bent exhaust valves when the cold(relative) air hits them and you get some neat thermal action.
dodgydan
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I supported Toymods
Location:
Sunshine Coast
Registered:
March 2004
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 12:34
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i dont know what could happen in this case sorry..but i was wandering, i have a crack in my exaust manifold it doesnt sound like its leaking or anything..but looks bad..is it screwed of what? i can get a pic if any one wants
thanks
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 12:43
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start engine
hold cloth over exhaust pipe, blocking the flow of exhaust gases.
if engine stalls, it's not leaking  (or not badly)
note: you can almost always hear exhaust leaks - they're *loud*
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Registered:
March 2004
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 12:46
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Just be aware that if you have an oxy sensor for injection control, any air being sucked in will affect fueling. And yes although the manifold is running at 20ish psi the velocity of the air will create a -ve static pressure on the inside skin of the manifold. In the context of this thread you are panicking for little reason.
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: Running an engine without exhaust?
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Thu, 01 April 2004 14:51
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i think that other then guessing, has anyone actually had burned or bent/warped exhaust valves from this cause??? i doubt it, other then chance & coincidence.
the corvair people used to plug their exhausts at shutdown because of these myths until they figured out that the valves were just crap(in that air cooled engine situation) to begin with.
i've been hearing this old wives tale for too long a time
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