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Old 05-07-2009, 05:47 PM   #1
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Default how much does a bad mufler/manifold gasket effect performance??

just wondering. Mine is not any good actually half of it broke off. I am getting a new one. Btw. My engine is screamin
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Old 05-07-2009, 05:54 PM   #2
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bumpity
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Old 05-07-2009, 06:01 PM   #3
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i know it's a boring thread but somebody has to know the answer.
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Old 05-07-2009, 06:02 PM   #4
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Glad you got your engine running again.. The gaskets should form a good seal. If they are ripped and torn you should replace them. It will only cause problems if you lose backpressure, but dont take the chance. If your manifold, or pipe are broken, or out of shape it is similar to an air leak, and will cause problems. You can still run, but it will be tuning and idling trouble, as well as a possible lose of power. If you have no backpressure your carb will get no fuel, so you cant run at all
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Old 05-07-2009, 06:13 PM   #5
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thanx jazz. I put my engine back together again. I got those really tiny dental brushes to clean inside my crankcase and rod. i just rinsed my p/s with fuel (all was cleaned with fuel) engine has lots of compression. It was carb sleeve leaking. Idles real well. But the gasket that goes inside my mufler is well I can't find it (i know that sounds crazy) and the one that came with the os has pretty much broke in half. And after tunning it today the engine did not have the punch that i would expect. I would have to be losing alot of compression. I think a new gasket set would make a big difference. Of course i am going to get one before i race this weekend. But do you agree it would account for a sizable loss of power???


oh and i am never running it when it is wet outside ever AGAIN!!!!!
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Old 05-07-2009, 06:14 PM   #6
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Quote:
Originally Posted by Jaz240 View Post
Glad you got your engine running again.. The gaskets should form a good seal. If they are ripped and torn you should replace them. It will only cause problems if you lose backpressure, but dont take the chance. If your manifold, or pipe are broken, or out of shape it is similar to an air leak, and will cause problems. You can still run, but it will be tuning and idling trouble, as well as a possible lose of power. If you have no backpressure your carb will get no fuel, so you cant run at all
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Old 05-07-2009, 06:25 PM   #7
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still a good amount of smoke comming out. But it was kinda eratic
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Old 05-07-2009, 06:59 PM   #8
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it is nice to see that you got it running again and you will be going
to the track good luck this weekend slow is fast
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Old 05-07-2009, 08:13 PM   #9
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You can create a temporary seal with silicone..make sure you buy the correct gasket..they are not all the same size

Yes you will lose power without good backpressure, that is why people spend so much time picking the right pipe
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Old 05-08-2009, 03:43 AM   #10
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Not only will you lose power, it will be erratic as the amount of backpressure changes due to leaking there. This is probably WORSE than a leaking carb. I wouldn't run it AT ALL that way- it can cause you to overheat your engine and damage it. (backpressure goes away, no pressure to tank to push fuel to the carb, engine leans out and overheats...)
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