365 xt into a ported 372

[Ironworker]

After about a tank or so top of piston.

 

[porsche965]

Nice work.

My 365xt "sleeper" is turning 13,850 and still barely 4 stroking. Fools a lot of timber guys

 

[huskyhansen]

I been messing with my 365 turned 372 and everyone is telling me the saw needs to run 12700 but mine seriously runs like crap at that rpm. I have a unlimited coil now so I could run higher but everyone has me freaked out that I'm running it too lean.

 

[huskyhansen]

Also I attempted porting the exhaust side but got nervous and didn't do near what I wanted to. How do you widen the exhaust port like that so much with out messing up timing. I know I can go wider but it looks in your pictures like you took quite a bit all the way around. Do yiu make it funnel getting larger as it exits the cylinder?

 

[huskyhansen]

 

[huskyhansen]

I got excited. Too much?

 

[Ironworker]

I really didn't widen it that much, yours looks good. I'm guessing you removed the divider in the transfer port cover. You can open the bottom transfers, I think that's where a lot of gains are made, it allows more fuel to make it up to the combustion chamber. I also took about .030 off of the bottom of the piston on the intake side to allow more duration (more fuel for the bigger lower transfers)

 

[porsche965]

If it is four stroking turn it up. Xtorqs like a leaner tune. Rich and mine falls on it's nose.

 

[MustangMike]

So Numa, WhenamIgonnagettorunthis?????

 

[Ironworker]

So Numa, WhenamIgonnagettorunthis?????

When ever you want, if you're ever cutting, give me a heads up, especially on this side of the river, I just did a 359 that screams also

 

[huskyhansen]

 

[huskyhansen]

That's all I have done to the lowers. Should I take more out. I'm not sure on this because I'm not even 100% sure what this does. Fuel moves faster into tip end maybe or more efficiently? How did you remove material for piston. All I have is a dremel

 

[huskyhansen]

I'm an idiot you just said that in your post. Excuse my idiotness

 

[Ironworker]

View attachment 461022

Read this
http://www.arboristsite.com/community/threads/project-stumpbroke-365xt.210321/

 

[huskyhansen]

Man that guy don't hold back. Crazy work on those transfers do most people do that much under the caps like that?

 

[huskyhansen]

 

[huskyhansen]

Can I remove that hump or at least a good chunk? Can't really tell in his pictures