Need Help With A Slimline Pitts Muffler
08-09-2007 | 05:22 PM
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From: San Jose,
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Need Help With A Slimline Pitts Muffler
Hi guys,
I have a slimline pitts style muffler for a Saito 180. There are two tapped holes. One which is protruding out, I assume is the for the tank vent nipple. The other one is on the side of the muffler intake.
My first question is what size fuel line nipple do I need as the muffler didn't come with it?
My second question is, what is the second tapped hole for? Is it for the breather nipple?
Thanks
I have a slimline pitts style muffler for a Saito 180. There are two tapped holes. One which is protruding out, I assume is the for the tank vent nipple. The other one is on the side of the muffler intake.
My first question is what size fuel line nipple do I need as the muffler didn't come with it?
My second question is, what is the second tapped hole for? Is it for the breather nipple?
Thanks
08-09-2007 | 07:37 PM
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From: San Jose,
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RE: Need Help With A Slimline Pitts Muffler
Yah, I got this new from Tower, but I don't think the second hole is a smoke tap because the picture of the smoke muffler shows the smoke tap on the flat end side of the muffler.
08-10-2007 | 10:15 AM
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From: Kershaw, SC
RE: Need Help With A Slimline Pitts Muffler
Does one of the nipples have a smaller hole than the other? I've never seen one on a Pitts, but some aftermarket 4 stroke mufflers have a PCV nipple (crankcase vent). The hole in the nipple is smaller than the nipple for the exhaust. If so, run a piece of tubing from your crankcase vent to the nipple with the smaller hole.
08-10-2007 | 10:27 AM
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From: Kershaw, SC
RE: Need Help With A Slimline Pitts Muffler
My bad .... Guess I oughta read the whole thing. It didn't come with any nipples .... Ok then , the hole on the side would be the PCV tap. I don't know the exact size, but I know the PCV nipple has a smaller hole than the tank pressure nipple. I don't know if I helped you out any or just confused you more. You might get a better answer in the Glow Engines forum .. or at least a better explanation.
08-10-2007 | 03:38 PM
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RE: Need Help With A Slimline Pitts Muffler
There is no such thing as a Polution control valve or PCV tap on any model aircraft four stroke engine.
The majority of model four stroke engines do have a crankcase vent and most have a nipple to plumb the vent outside a cowling venting to atmosphere. This vent is not plumbed to the fuel tank or muffler! Agine do not plumb this crankcase vent to the fuel tank or muffler.
YS engines are an exception here as they never have vented crankcases and case pressure is used for different purposes with that engine.
If your engine used a pressure tap on the stock muffler then do plumb a pressure tap line to the tank breather from the new muffler. If your stock muffler did not employ a muffer tap the it may not be needed at all.
No matter who or how they got there if your new muffler has two taps or holes you can bet they were intended for !. fuel tank pressure tap 2. smoke oil injection port.
If you don't have smoke then plug the extra hole. If you want to use a muffler pressure to tank pressure then pick one and use it. Usually the best pressure is obtained where the tank first opens up in area. However on those box mufflers thats always a crap shoot but not a big deal.
John
The majority of model four stroke engines do have a crankcase vent and most have a nipple to plumb the vent outside a cowling venting to atmosphere. This vent is not plumbed to the fuel tank or muffler! Agine do not plumb this crankcase vent to the fuel tank or muffler.
YS engines are an exception here as they never have vented crankcases and case pressure is used for different purposes with that engine.
If your engine used a pressure tap on the stock muffler then do plumb a pressure tap line to the tank breather from the new muffler. If your stock muffler did not employ a muffer tap the it may not be needed at all.
No matter who or how they got there if your new muffler has two taps or holes you can bet they were intended for !. fuel tank pressure tap 2. smoke oil injection port.
If you don't have smoke then plug the extra hole. If you want to use a muffler pressure to tank pressure then pick one and use it. Usually the best pressure is obtained where the tank first opens up in area. However on those box mufflers thats always a crap shoot but not a big deal.
John
08-10-2007 | 04:22 PM
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From: Yucaipa,
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RE: Need Help With A Slimline Pitts Muffler
There is no such thing as a Polution control valve or PCV tap on any model aircraft four stroke engine.
08-11-2007 | 11:24 AM
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RE: Need Help With A Slimline Pitts Muffler
Frankie,
You may not have ordered it, but you did indeed get the muffler designed for smoke. A non-smoke muffler has only one tap on the side of it. My best advise is to find a bolt that will screw into the smaller smoke tap and put it in to close up the hole. Then just fly the plane. Under no circumstances should you hook up the crankcase vent line to the muffler tap.
Ken
You may not have ordered it, but you did indeed get the muffler designed for smoke. A non-smoke muffler has only one tap on the side of it. My best advise is to find a bolt that will screw into the smaller smoke tap and put it in to close up the hole. Then just fly the plane. Under no circumstances should you hook up the crankcase vent line to the muffler tap.
Ken
08-11-2007 | 03:27 PM
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From: Kershaw, SC
RE: Need Help With A Slimline Pitts Muffler
ORIGINAL: JohnBuckner
There is no such thing as a Polution control valve or PCV tap on any model aircraft four stroke engine.
The majority of model four stroke engines do have a crankcase vent and most have a nipple to plumb the vent outside a cowling venting to atmosphere. This vent is not plumbed to the fuel tank or muffler! Agine do not plumb this crankcase vent to the fuel tank or muffler.
YS engines are an exception here as they never have vented crankcases and case pressure is used for different purposes with that engine.
If your engine used a pressure tap on the stock muffler then do plumb a pressure tap line to the tank breather from the new muffler. If your stock muffler did not employ a muffer tap the it may not be needed at all.
No matter who or how they got there if your new muffler has two taps or holes you can bet they were intended for !. fuel tank pressure tap 2. smoke oil injection port.
If you don't have smoke then plug the extra hole. If you want to use a muffler pressure to tank pressure then pick one and use it. Usually the best pressure is obtained where the tank first opens up in area. However on those box mufflers thats always a crap shoot but not a big deal.
John
There is no such thing as a Polution control valve or PCV tap on any model aircraft four stroke engine.
The majority of model four stroke engines do have a crankcase vent and most have a nipple to plumb the vent outside a cowling venting to atmosphere. This vent is not plumbed to the fuel tank or muffler! Agine do not plumb this crankcase vent to the fuel tank or muffler.
YS engines are an exception here as they never have vented crankcases and case pressure is used for different purposes with that engine.
If your engine used a pressure tap on the stock muffler then do plumb a pressure tap line to the tank breather from the new muffler. If your stock muffler did not employ a muffer tap the it may not be needed at all.
No matter who or how they got there if your new muffler has two taps or holes you can bet they were intended for !. fuel tank pressure tap 2. smoke oil injection port.
If you don't have smoke then plug the extra hole. If you want to use a muffler pressure to tank pressure then pick one and use it. Usually the best pressure is obtained where the tank first opens up in area. However on those box mufflers thats always a crap shoot but not a big deal.
John
08-12-2007 | 04:01 PM
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From: San Jose,
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RE: Need Help With A Slimline Pitts Muffler
Hi guys,
Thanks for all the responds. Here are some pictures of what I was talking about. You can see both the protruding hole and the one on the side of the intake.
Thanks for all the responds. Here are some pictures of what I was talking about. You can see both the protruding hole and the one on the side of the intake.
08-12-2007 | 06:17 PM
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RE: Need Help With A Slimline Pitts Muffler
The smaller hole on the header portion is in a position for an effective muffler tap to provide pressure to the fuel tank if you choose to use it that is where I would locate such.
The larger hole is centered to the outlet pipes and likely an intended point for smoke oil injection to provide uniform smoke from both outlets. If you have no smoke then plug the hole.
Do not plumb the crankcase vent to the muffler, leave it open to atmosphere or just a length of fuel line to clear the cowling if you like.
John
The larger hole is centered to the outlet pipes and likely an intended point for smoke oil injection to provide uniform smoke from both outlets. If you have no smoke then plug the hole.
Do not plumb the crankcase vent to the muffler, leave it open to atmosphere or just a length of fuel line to clear the cowling if you like.
John
08-16-2007 | 10:11 PM
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RE: Need Help With A Slimline Pitts Muffler
ORIGINAL: rloeb
The larger hole is for mounting a bracket that holds the muffler to the motor.
Rog
The larger hole is for mounting a bracket that holds the muffler to the motor.
Rog
Thanks for everyone's help!
