how close is too close?
05-17-2005 | 10:42 PM
#1
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From: Bangkok, THAILAND
how close is too close?
Hello All,
I bought a slimline moki 2.1 pitts inverted muffler for my MVVS 2.15. I live in Thailand and certainly took my chances hoping I could make it fit. Im very pleased with the quality of the product and even more pleased that I should be able to make it fit with minimal modifications.
There are two options I have right now, one is to mount to the existing rear hole of the muffler, mill out the exhaust port to match the MVVS then weld a small tab to the outside of the muffler to secure to the forward hole. (I dont really like this method)
My second option is to mount to the existing forward hole on the mufler, mill the exhaust port to match and drill another rear hole to secure. I would then just have to plug the original rear mounting holes. This is by far the nicest approach except for one small detail, the "can" part of the muffler comes into contact with the rear of the cylinder just as the forward hole lines up. So to make clearance I could mill 2 fins down about 3-4 mm on the cylinder head to provide clearance, or, put a radius dent in the can section to provide clearance. ( I dont like the dent idea, not easy to do properly).
So my question to you all is, how much clearance is necessary between the cyliner and the can section of the muffler to provide adequate clearance for cooling?
FYI, the general consensus over here is, if the muffler doesnt physically touch the cylinder then its not too close.
Regards, Johan
I bought a slimline moki 2.1 pitts inverted muffler for my MVVS 2.15. I live in Thailand and certainly took my chances hoping I could make it fit. Im very pleased with the quality of the product and even more pleased that I should be able to make it fit with minimal modifications.
There are two options I have right now, one is to mount to the existing rear hole of the muffler, mill out the exhaust port to match the MVVS then weld a small tab to the outside of the muffler to secure to the forward hole. (I dont really like this method)
My second option is to mount to the existing forward hole on the mufler, mill the exhaust port to match and drill another rear hole to secure. I would then just have to plug the original rear mounting holes. This is by far the nicest approach except for one small detail, the "can" part of the muffler comes into contact with the rear of the cylinder just as the forward hole lines up. So to make clearance I could mill 2 fins down about 3-4 mm on the cylinder head to provide clearance, or, put a radius dent in the can section to provide clearance. ( I dont like the dent idea, not easy to do properly).
So my question to you all is, how much clearance is necessary between the cyliner and the can section of the muffler to provide adequate clearance for cooling?
FYI, the general consensus over here is, if the muffler doesnt physically touch the cylinder then its not too close.
Regards, Johan
05-18-2005 | 01:18 AM
#2
Senior Member
RE: how close is too close?
Johan,
Since the important cooling flow is between the fins, and this is not impaired, I don't think you will have a problem with cooling, if there is 1-2 mm between the silencer and the engine's fins.
Matching the ports for a good flow is the problem you are facing.
Why did you not buy a silencer, that was designed for the MVVS 2.15?
Is there some kind of adapter available?
Your modification can either work well, or not...
Since the important cooling flow is between the fins, and this is not impaired, I don't think you will have a problem with cooling, if there is 1-2 mm between the silencer and the engine's fins.
Matching the ports for a good flow is the problem you are facing.
Why did you not buy a silencer, that was designed for the MVVS 2.15?
Is there some kind of adapter available?
Your modification can either work well, or not...
05-18-2005 | 03:25 AM
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From: Bangkok, THAILAND
RE: how close is too close?
Hello Dar,
Good to hear that you think that cooling will not be a problem. Matching the ports is a minor obstacle, since I have access to a mill it is not a big deal to enlarge the port on the muffler. It will still seal properly so no worries there. The engine will go into a World Models giant scale P-51, there is very little room for a silencer and so the slimline was the only thing that I could find that would even come close to what I needed. There are very few mufflers available specifically for the MVVS 2.15, even less if you are looking for a compact one. I will send a picture soon to help clarify my situation.
Regards, Johan
Good to hear that you think that cooling will not be a problem. Matching the ports is a minor obstacle, since I have access to a mill it is not a big deal to enlarge the port on the muffler. It will still seal properly so no worries there. The engine will go into a World Models giant scale P-51, there is very little room for a silencer and so the slimline was the only thing that I could find that would even come close to what I needed. There are very few mufflers available specifically for the MVVS 2.15, even less if you are looking for a compact one. I will send a picture soon to help clarify my situation.
Regards, Johan
05-18-2005 | 03:15 PM
#4
Senior Member
RE: how close is too close?
I agree,
Cooling will not be impared by the muffler. It is the air that goes through the fins that does the cooling, not the air that flows around.
Cooling will not be impared by the muffler. It is the air that goes through the fins that does the cooling, not the air that flows around.
