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jmssaws

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But if you drop it more the ring moves up more. you couldn't raise the jug back up.
Correct.
I'm upside down today.

What can be gained by raising the intake roof? I wouldn't think there's any flow to gain. I like the idea of getting started closing it asap.
A 394 is a incredible running saw and has a intake that's a 1/4" tall.
 

David Young

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I see you are polishing the whole duct on the transfers what are you using to get in there?
 

David Young

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it is at least equally a plausible that I am having a brain fart and not thinking of something. if it wasn't so laid back here I would probably keep my trap shut. :)
 

jmssaws

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it is at least equally a plausible that I am having a brain fart and not thinking of something. if it wasn't so laid back here I would probably keep my trap shut. :)
I knew what we were talking about but typed about the exhaust floor.
My brain is going bad.
To much aluminum dust
 

awol

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Raising the intake roof does have its place, but there is a point where it is counter-productive. Keeping the port entry into the cylinder the smallest point in intake tract, will ensure maximum flow velocity into the case. Using the stock intake and carb on the 262, I don't think the roof needs raised at all.
 

drf256

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Raising the intake roof does have its place, but there is a point where it is counter-productive. Keeping the port entry into the cylinder the smallest point in intake tract, will ensure maximum flow velocity into the case. Using the stock intake and carb on the 262, I don't think the roof needs raised at all.
Really?

Then most saws I've ported would never need the intake port touched at all.

Interesting
 

paragonbuilder

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Really?

Then most saws I've ported would never need the intake port touched at all.

Interesting

I find this interesting as well. But the truth is everything I know about porting I learned from someone else. It works. But as we're learning now there are other ways... What's necessary, what's not...
These are the things I hope to learn here!
 

awol

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There are a lot of places to grind on an intake besides the roof. I always square up the floor and widen a bit. For me, deciding how large the port needs to be, depends on length of intake tract, size of carb bore, desired operating speed, and port duration.
 

paragonbuilder

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Raising the intake roof does have its place, but there is a point where it is counter-productive. Keeping the port entry into the cylinder the smallest point in intake tract, will ensure maximum flow velocity into the case. Using the stock intake and carb on the 262, I don't think the roof needs raised at all.

There are a lot of places to grind on an intake besides the roof. I always square up the floor and widen a bit. For me, deciding how large the port needs to be, depends on length of intake tract, size of carb bore, desired operating speed, and port duration.

Now I'm confused. Lol. You said to keep the port opening to the cylinder the smallest part, no? Normally they are already larger than the intake tract. But now you said you widen.
I must be missing something...
 

Chainsaw Jim

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It's pretty lame that this has to be an argument when it isn't religion or politics. It's actually science so start showing your results if it doesn't work. I've showed my results of it working.
 

jmssaws

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It's pretty lame that this has to be an argument when it isn't religion or politics. It's actually science so start showing your results if it doesn't work. I've showed my results of it working.
Who's arguing? Did I miss something?
I'm bad to miss something ain't i. Lol
 

awol

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It's pretty lame that this has to be an argument when it isn't religion or politics. It's actually science so start showing your results if it doesn't work. I've showed my results of it working.

I certainly am not arguing, but am kinda hesitant to post any more here for fear that it will be construed as such.

For an example, the video I posted earlier of Mikes 2171 had the jug lowered .060, and the intake port was only squared up and smoothed, not raised. The carb and intake are completely stock. If I could put a 390 boot and rwj4 on one I would raise it as far as ring travel would allow. The intake port on these 372s are tiny, and also skewed to the flywheel side.

I like to experiment; many have been wildly unsuccessful, and a few have been mildly successful!
 
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Chainsaw Jim

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I certainly am not arguing, but am kinda hesitant to post any more here for fear that it will be construed as such.
Who's arguing? Did I miss something?
I'm bad to miss something ain't i. Lol
Apologies to both of you.
I'd say using the word argue was a bit stronger than I intended the comment to be. I should have worded it more as a debatable belief. Basically to me when a group believes in using a method another group doesn't then there will be a clustertruck of confusing advise when it is questioned. I'm all for seeing some testing but that may be near impossible since different build recipes can take what's known clear off the charts.
 

drf256

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Awol,

I'm listening to what you have to say. Your work speaks for itself.

Your "one size doesn't fit all" statement proves to me even more that you know you're stuff.

I like talking theory. You never know what ideas can arise when many opine.

Nothing negative about it to me.

I'm all ears guys. If you don't like the conversation, politely excuse yourself.
 
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