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Blow-by ?
- Thread starter spydsense
- Start date
groundeffect
Registered User
From my experience it mostly drips down on the right side of the Spyder, from the airbox (just behind the coolant tank), and drips onto the Radiator on the right side. It can then drip in front of the fan, which blows it rearwards slightly making it land on the black panel that the air from the radiator exists. You may get an oil burnt smell from where it cooks on the top of the radiator. It may run down the side of the fan on then onto the ground or your garage floor - take a peek underneath when you're parked for a while.
I am running stock and recently cleaned my airbox for the second time. Taking the panels off and cleaning the airbox is not so bad and it gives me a chance to check out other things under the panels while I'm at it.
There are a number of solutions. Mostly common is installing a catch can system that catches all of the blow-by oil in a small container so you can easily see it and depose of it when it gets near full.
The other option that I considered is installing a small section of sponge in the vent tube - this is supposed to keep the oil out of the airbox and I think keeps it in the engine and oil tank, really.
Are you seeing oil on your engine? Where? If you think you are seeing blow-by oil, it is easy to verify that's what it is:
1) Open the trunk on your Spyder
2) Remove the service panel - so you can see the coolant tank
3) Get a flash light and shine it passed the coolant tank at the airbox
4) You'll need a good bit of light - and look at the seam in the airbox where the top meets and seals to the bottom half - right in the middle of the airbox.
5) If you see oil there that looks like it seeped from the seam, it is likely just blow-by oil. You may want/need to clean your airbox, very soon.
6) Since you're in there, use the flashlight to backlight the coolant tank and check your coolant levels
If you are seeing oil in any rate, outside of the engine, the source needs to be found, just to be sure it is not a serious issue. From what I understand blow-by is a normal characteristic of these engines and other engines that are so high strung. Blow-by oil is not a serious issue, it is just a mess, but does need to be cleaned up once it starts to seep outside of the airbox.
I am sure others will post, also.
Hope that helps for now and please keep us updated on your findings.
Cheers from Newfoundland.
SpyderWolf
New member
Good post Dean. That is the same thing I have experienced so far, nothing on the engine itself up to this point.
From my experience it mostly drips down on the right side of the Spyder, from the airbox (just behind the coolant tank), and drips onto the Radiator on the right side. It can then drip in front of the fan, which blows it rearwards slightly making it land on the black panel that the air from the radiator exists. You may get an oil burnt smell from where it cooks on the top of the radiator. It may run down the side of the fan on then onto the ground or your garage floor - take a peek underneath when you're parked for a while.
I am running stock and recently cleaned my airbox for the second time. Taking the panels off and cleaning the airbox is not so bad and it gives me a chance to check out other things under the panels while I'm at it.
There are a number of solutions. Mostly common is installing a catch can system that catches all of the blow-by oil in a small container so you can easily see it and depose of it when it gets near full.
The other option that I considered is installing a small section of sponge in the vent tube - this is supposed to keep the oil out of the airbox and I think keeps it in the engine and oil tank, really.
Are you seeing oil on your engine? Where? If you think you are seeing blow-by oil, it is easy to verify that's what it is:
1) Open the trunk on your Spyder
2) Remove the service panel - so you can see the coolant tank
3) Get a flash light and shine it passed the coolant tank at the airbox
4) You'll need a good bit of light - and look at the seam in the airbox where the top meets and seals to the bottom half - right in the middle of the airbox.
5) If you see oil there that looks like it seeped from the seam, it is likely just blow-by oil. You may want/need to clean your airbox, very soon.
6) Since you're in there, use the flashlight to backlight the coolant tank and check your coolant levels
If you are seeing oil in any rate, outside of the engine, the source needs to be found, just to be sure it is not a serious issue. From what I understand blow-by is a normal characteristic of these engines and other engines that are so high strung. Blow-by oil is not a serious issue, it is just a mess, but does need to be cleaned up once it starts to seep outside of the airbox.
I am sure others will post, also.
Hope that helps for now and please keep us updated on your findings.
Cheers from Newfoundland.
Just a note the oil drips out the weep hole bottom right side of the air box .
SpyderByter
New member
:agree: Mine was doing the same, just as groundeffect described. I have since cleaned out the airbox and put a foam filter inline and so far. a few hundred miles and no oil drips.
TexasTripod
New member
Blow-By
The first time I noticed the oil seepage it was on the black panel that groundeffect described. I thought that it was anti-freeze leaking because it was also on top of the radiator. I started replacing hose clamps until I found the answer here on this forum.
The first time I noticed the oil seepage it was on the black panel that groundeffect described. I thought that it was anti-freeze leaking because it was also on top of the radiator. I started replacing hose clamps until I found the answer here on this forum.
groundeffect
Registered User
Thanks for your comments.
Ah, that is what I thought, initially, that it was coolant. However, I discounted it being coolant since it didn't smell sweet like coolant normally does and it had a brownish color like oil. A little further looking and you got it, it was blow-by oil.
So for those of you who did the 'in line sponge in the tube' - do you have any pictures to help describe the type of material you used and which hose you installed it in, to help explain the installation?
Thanks in advance.
spydsense: Are you getting a lot of oil? Have it been identified as blow-by oil, from the airbox, or do you think you have an oil leak in a line, or the tank?
Thanks
krb1945
New member
Groundeffect stated it...
correctly. I would hope rotax would install an internal engine vent tube splash guard but as of this date they have not done so. Even with an internal splash guard there may still be blow by because of the speed of piston travel. One of the engineers or master mechanics can probably explain this phenomenon much better. /Ken
correctly. I would hope rotax would install an internal engine vent tube splash guard but as of this date they have not done so. Even with an internal splash guard there may still be blow by because of the speed of piston travel. One of the engineers or master mechanics can probably explain this phenomenon much better. /Ken
spydsense
New member
thanks groundeffect.....I don't think that is my problem. I dropped the spyder off at the dealer the other day purge valve is bad again...and asked them why there was oil on the left side of the motor I saw it when I was checking the oil they told me is was blow-by oil from the airbox. I am not so sure. I think I will have them check that out. Will let you know what I find out..
thanks again
P.S. I have had my spyder for 2 years on 4-12 YEA!!!!!!!! still love it
thanks again
P.S. I have had my spyder for 2 years on 4-12 YEA!!!!!!!! still love it
NancysToy
Motorbike Professor
Highly unlikely to be oil from the airbox, which is on the right. More likely a bad valve cover gasket, or another leak. Time to lean on your lazy tech.
:agree: If it's coming from the air box like the tech said the oil would be dripping out of the bottom of the box on the right side .
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