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Old 03-28-2019, 07:41 PM
txluke txluke is offline
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Default A temporary fail

When I picked up a #420 chain from the little bike shop in the middle of nowhere that has been there forever, the old man running it and I started talking. He said he saw someone make an adaptor for a pod airfilter with pvc. I went to Lowes and saw this 2" threaded cap. I got home and marked out where to grind out. It looked like it was going to work but I had the wrong side of it up. I will try again this weekend and slap on a $10 filter for the grand total of $15 (including my first mistake.)
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Old 03-28-2019, 08:09 PM
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One question, since I eventually will put a pod on my Briggs.
How well does PVC stand up to the sun?
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Old 03-28-2019, 09:39 PM
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Originally Posted by JTSpeedDemon View Post
One question, since I eventually will put a pod on my Briggs.
How well does PVC stand up to the sun?
My fence is made out of PVC and has been standing there for 15 years now so.....
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Old 03-29-2019, 07:29 AM
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Poly Vinyl Chloride can not be killed.
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Old 03-29-2019, 09:53 AM
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In that case I'll probably make a pod adapter out of PVC someday.
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Old 03-29-2019, 10:48 AM
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In that case I'll probably make a pod adapter out of PVC someday.
If you give your engine a vape pod, it makes more power.
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Old 03-29-2019, 11:09 AM
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Erm, (cough), not that kind of pod.
I think not.
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Old 03-29-2019, 12:24 PM
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I was going to actually try that for my kart instead of buying an adapter. Any drawbacks?
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Old 03-29-2019, 01:19 PM
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PVC is actually NOT a good material for such application IMHO,
while it's rather resilient to sunlight
(it does get brittle over time, but that is a looooong time so nothing to be concerned about)
and it's certainly resistant to most oils I could think of,
it's soluable in Acetone and Ester Ether and.. Benzene
(gasoline fuel is called Benzin in germany .. wanna make a guess why?)

And while there shouldn't end up fuel in the airfilter ..
chances are one unlucky mistake is enough.

And here's the obnoxious part:
it's not about having your filter adaptor softened or broken or lost..
but the dissolved chains of PVC might end up clogging the carb,
and you will have a terrible time cleaning that out
(if you even make the connection between dissolved PVC and a clogged carb that day)

So IMHO.. a gasoline proof plastic is a much better option here

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Old 03-29-2019, 01:38 PM
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Quote:
Originally Posted by itsid View Post
PVC is actually NOT a good material for such application IMHO,
while it's rather resilient to sunlight
(it does get brittle over time, but that is a looooong time so nothing to be converned about)
and it's certainly resistant to most oils I could think of,
it's soluable in Acetone and Ester Ether and.. Benzene
(gasoline fuel is called Benzin in germany .. wanna make a guess why?)

And while there shouldn't end up fuel in the airfilter ..
chances are one unlucky mistake is enough.

And here's the obnoxious part:
it's not about having your filter adaptor softened or broken or lost..
but the dissolved chains of PVC might end up clogging the carb,
and you will have a terrible time cleaning that out
(if you even make the connection between dissolved PVC and a clogged carb that day)

So IMHO.. a gasoline proof plastic is a much better option here

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Old 03-29-2019, 01:43 PM
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Hmm, thanks for pointing that out.
Nevermind with a PVC adapter.
Oh wait though, my carb is an updraft, so the fuel would have to go out of the bowl, straight down, then horizontal at a 90* angle, and then straight up to the air filter.
So maybe that would work.
but after I remove the governor someday, I'm going to give it a new carb, possibly a Mikuni, since the air has to go through, lemme think, 4 90 degree turns!!
YIKES! That's one inefficient carb! 360* before the air gets into the engine! AFTER going through the restrictive air filter!
I've gotta fix that someday.
txluke, any progress on that adapter?
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Old 03-29-2019, 02:47 PM
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Quote:
Originally Posted by JTSpeedDemon View Post
Hmm, thanks for pointing that out.
Nevermind with a PVC adapter.
Oh wait though, my carb is an updraft, so the fuel would have to go out of the bowl, straight down, then horizontal at a 90* angle, and then straight up to the air filter.
So maybe that would work.
but after I remove the governor someday, I'm going to give it a new carb, possibly a Mikuni, since the air has to go through, lemme think, 4 90 degree turns!!
YIKES! That's one inefficient carb! 360* before the air gets into the engine! AFTER going through the restrictive air filter!
I've gotta fix that someday.
txluke, any progress on that adapter?
It doesn't take THAT much energy.

Do you have a briggs with one of those giant tubes connecting to the motor. Keep that. It may take a *small* amount of energy to move the air gets benefitted by a large boost in low end torque. Especially since you have a flathead, which isn't efficient to start with and have no torque converter to help with low-end torque, I'd keep it.

Here is the torque curve between a tiny intake runner and a long one like you have on real car engines. It is making more power over nearly the entire power curve and only loses a bit at the top because of the inefficiency from having a long intake runner. Is a small amount of peak power is a good tradeoff over a better longer powerband?
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Old 03-29-2019, 03:37 PM
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Hmm, good point. Maybe I'll keep the setup and just upgrade the stock carb.
Also, I want to make this thing a wheelie and burnout MACHINE!
But it is interesting, txluke, the idea of PVC pod adapters.
Nice job!
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Old 03-29-2019, 05:42 PM
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Quote:
Originally Posted by JTSpeedDemon View Post
Hmm, good point. Maybe I'll keep the setup and just upgrade the stock carb.
Also, I want to make this thing a wheelie and burnout MACHINE!
But it is interesting, txluke, the idea of PVC pod adapters.
Nice job!
Well low end torque is ESSENTIAL to wheelie machines! Stock carb upgrade or a new jet would probably so wonders.
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Old 03-29-2019, 06:16 PM
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What I meant was: BECAUSE, I want to make this thing a wheelie and burnout MACHINE!
I'll see what I can do without billet parts or governor removal.
My thought is, if I can make it have enough low end torque, I can gear it way high to still get a nice top speed without severely compromising takeoff, all while keeping a relatively longer engine lifespan because the governor stays in.
Anywhoo, I think we should stop clogging up txluke's thread with our chitchat until he updates us. I know I don't like having my threads clogged up with chitchat.
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Old 03-29-2019, 07:28 PM
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Chit chat away. Just got home and the kids and I are going to make seats for my big kart. In the spirit of me being a tightwad the leather was cut off the back of a couch on the side of the road and the foam was from the back cushions. I will start a thread for that.
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Old 03-29-2019, 07:38 PM
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Heheh! Resourcefulness, using a curb couch for leather! I plan to do that for my kart!
'Cause I want a leather seat...
The other people in my church that have a kart don't have THAT I think.
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Old 03-29-2019, 07:58 PM
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roll your kart and the carb my spill gas in BOTH directions..
have a sudden hiccup surprise you while refilling the tank spilling gas everywhere...

have troubles starting your kart and spraying start spray in the airfilter (being too lazy to remove the adaptor)

chances are one day or another every single part on and near by your engine gets in contact with fuel...
And while that's not the end of the world, you might want to avoid such spillage
causing more work than some general rag-ama-wipe, no?

So complexity of the fuel path in your carb is NOT a safety feature from fuel getting out


Also PVC is terribly easy to get to it's transition temp (80C is all it takes to soften it considerably)
so water barely hot enough for green tea is all it takes to deform a PVC part..

You can find PolyCarbonate PolyPropylen several other thermoplasts that are actually fuel proof
(for all I know unplasticised pvc [PVC-U] appears in some lists as fuel proof... maybe treated? IDK.. I wouldn't want to place bets on it tbh)
Most are easy to machine
PMMA if you get a chance PTFE if you can afford the insane pricerange for machinable stock

and JB weld will always be there for you as well

'sid
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Old 03-29-2019, 08:19 PM
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Yeah I know what you mean by getting fuel all over the place.
When my bro and I had a lawn mowing biz, we would ALWAYS spill fuel all over the top of the engine(Honda GCV160 vertical shaft, I'm a geek I know), but ESPECIALLY my brother. He still spills gas on the mower.
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Old 03-29-2019, 08:37 PM
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The hot water out of my faucet is well over 80.
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