Advanced 2 stroke porting part 1, case trenching.

[@vikingjetnorway13]

Hi. Thank you for a very interesting videos. I am a RC Offshore Heat Race person and we use 2 stroke 27cc and 35cc gas engines. I live in Norway and now the winter has arrived. Keep up the good work! Thank you very much. Best reg., John in Norway

[@fredmetcalf]

Appreciate what you said about engineers......sometimes saw modifiers who don't have a clear/complete picture of how a product is developed and produced come across as haughty and arrogant as if they are better at this than the engineers who develop and produce the saws. It is helpful to see, understand and appreciate that if it weren't for the engineers and the OEM, they wouldn't have a saw to work on and MODIFY. A word to saw modifiers: you're not starting from scratch like we do; you're coming in very late in the game and changing the course of the product by modifying the saw....just as Tinman described.....if you had to pass the QA/QC tests like we do, you would be stopped short every time.....kindly meant, fm

[@frankschwebel8605]

Totally agree . I wouldnt think twice about altering the port timing .

[@Connor33558]

hey tinman sometime you should port two cylinders for the same saw to show what different timing numbers can do. One could be torquey and one could be for high RPM. You could then compare how well each cut with a short bar and then a long bar.

[@rogerstafford-wakeinc.2088]

We call it case matching in 2 stroke motorized bicycle “ world” The Chinese components are either poorly cast or do not match the cylinder to bodies. A lot of us that put your saw heads on China dolls have to do this. I have also done some of this work on a 49mm piston build that came from the factory with only have the transfer space open. You can see what I’m referring to in my videos.Aga thanks for the help. I’m learning with you and from you. Godspeed.

[@CharlesBrisco]

Sometimes you just have to build yourself a monster to me it's worth it for all the time I put into some builds brings the fun factor way up I'm looking forward to your build take it easy an have fun with it

[@powersawtomfoolery6739]

Tinman! You're awesome! Thanks for sharing your knowledge. I recently ported a 064 that needed freshened up. Man it rips! I put a 36" bar on it. I cut a 35" fir yesterday, it really likes it! Now I'm doing a ms180. Domed piston, ported and decked, yep, decked the jug including bearing and seals. Why? Why not! Lol. Keep up the good work.

[@shaint6248]

I just bought a project saw that I don't need lol.I wanted a challenge to see what I can make it do. It ended up being a ms362 and I know nothing about that model saw. Stay warm!

[@Steve_K_MS660]

Glad to see I wasn’t completely crazy. First time I took a grinder to a saw I smoothed all the sharp corners in the crankcase out. Great content as usual.

[@travisweldmaster7815]

And the cutaway jug was ingenious absolutely, love ya buddy

[@shapeshifter7753]

Happy to see you as always! I know you stay awake thinking about these things so… it occurred to me that a strategically placed thermometer may prevent a hot saw from blowing up!? Maybe it’s been done before? Anyhoo, I’m hoping it’ll give ya something to think about😃

[@230e4]

You may not need a ported 394 but it has already put a smile on your face and you haven't even built it yet! I can't wait to see your face when you run this saw with a 32" light bar. This combination of power and a balanced saw in your hands will really make you glad you built it. When I want to fell timber with a 32" bar a ported 394/395 is my favorite choice. Thanks for sharing your enthusiasm.

[@Finom1]

Amazing educational video:) I love all the details and closeups:)

[@SNELLERIZED]

I would consider this case matching or case porting. My understanding of case trenching is a groove cut in the case along the path of the big end of the rod, and/or counterweights, typically required when putting a longer stroke crank into an engine. You end up with a "trench" cut into the case, thus the name. The term is also sometimes used to describe the process of cutting "trenches" into a case to aid in the flow of air. However, this process involves significant removal of material, rather than flowing or building up areas as you have described. This type of trenching might be incorporated into the process of porting and case matching as you are doing.

[@travisweldmaster7815]

HEY FRIEND! lol good info good to see ya and excited to see thos big nasty get...really big nasty!

[@Andyshine77]

God video sir! I personally call it case matching, but that's just lingo. Thanks for sharing.

[@HILLBILLYSFIREWOOD]

Hey hey tinman, have a good week buds.. stay warm...

[@lukeselectric]

Loving it Tinman!

[@rtdc5662]

I made a cutaway today with a custom display stand. Tinman was my inspiration!

[@jamiedalluge9472]

Ironhorse is gna b building himself a 394 as well. Gna b awesome to see the difference in the builds!

[@williamnicholson1853]

Got me thinking about trenching the case on my next build 👍thanks buddy! Spent the last 4 days making my first saw pipes. Grinning ear to ear getting wood. Absolutely awesome.

[@shawncapps1173]

you are doing very well repairing the power saws I am extremely proud of you Mr. Tinman. 😊

[@waydehamm7928]

Awesome job on case trenching, I have an all OEM 394 that I only restored with just new rings in it , can't wait to see this monster eat wood 👍👍

[@tdawg8605]

So much to think about, so little time. Gonna be very interesting to follow this build. Thanks Tinman for your enthusiasm and knowledge, it is very much appreciated. Mahalo🤙🤙🤙

[@KowboyUSA]

Got a Craftsman and a Poulan that are basically a duplicates (size-wise; both are toolbox saws). Been thinking if I ever do it, the Poulan would be candidate for some experimentation in porting.

[@jasonmcclure9335]

Wow the information you put out is amazing!

[@ScrewdriverTUNING]

Great video. Can’t wait for the build. Love hearing your ideas and thought process. Keep being great. !!!!❤️‍🔥🦾

[@stihlhuskyworkin1011]

Hey tinman! Have a good week brother. Great video ✊🏻🤙🏼

[@happy8637]

Nice video I'm following the series! Interested to see how the timan thinks. I've watched all your videos and learned a lot. Thank you sir

[@DaveyBlue32]

Another fantastic video!!! psycho-tin-bash-10,000 style!!! If they get too purdy then I’m afraid to scratch them so I’m less apt to run it!!! Down and dirty!!! It’s not about being smarter than an engineer!!! They are limited and we ain’t!!! Way to say it!!! TinBasher!!! Bash on … my good man!!! Bash on!!!

[@NothingButChainsaws]

Chain bench grinder for life lol, love watching your vids bud. I learn a lot!

[@timwoodger7896]

Iv got an old stihl 070 that I wouldn’t mind playing with, it’s all in bits at the min and was wondering if there’s anything I could do to make it run at its best. Love your way of teaching tinman You just get to the point in clear and understandable way 👍

[@ikesquirrel]

A LOT of times, adding material in key places can do more than removing material. I have added as much as I removed, or more. The engine is an air pump, and it takes hp to move air through itself. The easier the air can move through it, the more power you will free up at the crank. I ported a 350 that spanks my stock 372xp. There is a ton of jb weld in the 350 and the ports are large. It is also VERY fuel efficient. I'm tempted to port my 372 the same way and see what happens.

[@gyulatimko2075]

I can not wait for the result of this port job on this beast :)

[@whatnowstinky]

another great video Tinman. thanks.

[@latinodeathjazz]

Great video Tinman. I’ve been rummaging through IPL’s with one hand and watching my phone in the other joining up dots (been wondering what the innocuously titled ‘flange’ (PN 1119 020 1800)was for in 382’s for ages! Transpires it’s not a stuffer as initially speculated but rather a redirector of flow into the transfers. I don’t know if your 038 build has one under the cylinder but if it does I reckon there’s some gains to be had manipulating it’s flow characteristics). You sir are a scholar and a gentleman. Looking forward to the rest of this series. Al

[@poparamiro]

Great info as always! 🤝🤝🤝

[@rustbeltfabrication4468]

Tinman a friend from Ontario, if I had a dollar for everytime I've heard you're not an engineer I'd still make half the wage to improve there design lol

[@mfsaws8240]

Advanced porting love it! It’s just a bucket of parts tinman. Let er eat!

[@ronsilva516]

Cool look for the whole thing done a it will be a nice journey 👍👍👍😎

[@michaelwhiteoldtimer7648]

Thank you for taking the time to share your knowledge

[@aaronpowell4885]

Great explanation👍 definitely some turbulence going on in those cases!

[@BRKS-fj2jt]

You will increase case volume and loose push up the transfers alot of air moves through piston windows, more gains through cylinder machining base band and numbers changed

[@JohnnyMarshall-qr3pe]

TinMan I just started doing this myself and worst “case” scenario. If you grind into those cutaways on the facing side fill them with JB quick steel. It will hold, or at least it did with my 372 ripper. Keep er WFO

[@MrRmh3481]

Be careful that you dont knock your fuel out of suspension. What is your crankcase compression ratio?

[@stevetheriault4164]

Great EXPLANATION CASE MATCHING get your 394 ready for BUCKINSTOCK, YOULL BE GRINNIG FROM EAR TO EAR 😁😁😁😁😁HOPE THE SAW TURNS OUT TO BE NASTY😎😎😎IM SURE IT WILL GOODLUCK BUDDY YOU DESERVE A WICKED NASTY SAW FOR YOURSELF TAKE CARE TINMAN HOPE SOME OF THAT SNOW WILL START MELTING DOWN FOR YOU

[@JMB676]

I would raise the intake duration a couple degrees too, to suck in a little bit more air into the crank case. Veining the case will raise the overall volume of air allowed in case because of the material your taking out. It's a minimal but it's there. Or you can deck the case a couple thousand instead of the jug base and make a pop up to raise the compression. Basically I'm saying there's a couple ways to go about it but it needs to be thought about. But maybe that's just me. I did it once before and it was a ripper and very hot compared to none veined.

[@stuartramage5933]

awesome peace an love from scotland

[@Saw_Squatch]

I've seen some guys grind those groves into the lobes on saws crank, never got to see it in the wood unfortunately but I've been curious to see what can be done with it

[@KompressorPete]

Great info friend 😊 please keep on sharing your experiences! Could you explain it one more time reeeeel simple - what happens when changing intake, blow down or exhaust. Do you have 5 like basic rules you follow?

[@jacobrowe515]

I'm gonna do some crazy stuff with saws but after watching your channel and dabbling with a few saws now I'm eyeballing my innocent little old jiffy 76 ice auger 😬 it looks just like a chainsaw cylinder on there 🤷🏻‍♂️

[@jacobrowe515]

Also on the topic of having saws way bigger than anything you'd ever need, I put together one of them Chinese Ms 660 knock offs with a hyway big bore... I literally don't even cut firewood or anything 😂

[@anthonypryor2852]

What I am hearing from my saws that I’ve been doing for people is RPM and throttle response. It’s not as responsive as a 500I but it’s much closer. My numbers are often 102-98 ex Blow down 20-30 Squish .020-.025 Intake 75-80 Tonsil shaped and textured intake widened and rounded corners on exhaust. Dual or triple port exhaust at 90% of exhaust port area no screens.

[@SUROBLEDEKchannel]

Nice share

[@bradshawmountainman4473]

Hey Tinman, I have a question. Looking up case splitters, there are many out there. What "universal" case splitter is there or do various brands/models need their own case splitter? What do you recommend?

[@joshholbert9120]

Thanks for sharing and explaining this.

[@davidwisowaty1914]

are you sticking with the 394 cylinder for this build? any thought to going 58mm with the 395 conversation? as always enjoy your content. Dave

[@tinmanssaws]

Yes I'm going 394 top end. I like the intake block setup on the 394!!

[@jessehubbard9133]

Can't wait to see it ripping

[@lukeselectric]

Hey Tinman! When is it a good idea or not a good idea to case match?, I did a 272xp with Harvey's numbers and I did case match because I thought it was a good idea

[@topchoppers7980]

I've got a 272 that I'm gonna do some case matching on but its also gone be big bore with pop up, tight squish and I've got a few other ideas to make it spin faster hybrid ceramic bearings, I'm gonna weight balance the crank rod and piston, have some machine work done to the flywheel and clutch to reduce weight as well that will be eventually shown on my channel, and as tinman said it's all what you want it to do and how you want it to do it hope any of this helps

[@Sensei948]

@@topchoppers7980 oil mix 1:33 is ok ?

[@topchoppers7980]

@@Sensei948 yes just be a lot of smoke, I run my stuff 40/1 but I'm thinking 35 for the 272 I'm building with ceramic bearings I don't want a failure from premature wear or heat so just precaution

[@Sensei948]

@@topchoppers7980 Friend, when used at home, 372 xp 357 xp and 351 1:33 mixture can damage the piston by excessive carbon deposits?

[@topchoppers7980]

@@Sensei948 yes that does tend to build more carbon but If you operate a saw right they get hot enough to keep that carbon burned off and out go watch my video on the two big poplars, that saw did have an air leak in the intake boot but had little to no carbon build up because I ran it hard I don't let it cool down between cuts saws run better when ran hard and hot not overheated just hotter than idle, . . Run your saw, . make the saw, work, engines like to be "under load"

[@justinweaver8787]

Gonna be cool.

[@johnkosheluk1041]

have you ever mod a stihl ms 201 m tronic saw I am a stihl mechanic

[@jensenwilliam5434]

Thank s!!

[@danielcarter7430]

Which JB Weld do you use for that?

[@adambatchelder4121]

So i would call that case porting . In my world of 2 stroke motorcycles case trenching is just grinding a trench for a stroker crank.

[@dans_Learning_Curve]

I have a crazy idea. I have two identical 50cc Olympic saws. I don't have a 100cc saw.... I don't have a 2 cylinder saw... I want a 100cc and a 2 cylinder saw just to play with! I have a mill and a lathe. Have you seen two 2 stroke engines married together? I have some vague ideas where to start. I've searched but haven't found anyone that's made such a mess! LoL 😂😆

[@lukeselectric]

I'll definitely watch that!!!

[@nateolmsted899]

153

[@jeffhuntley2921]

7:10 Engineers are smart?!? Come work at an independent collision repair shop and you’ll hear half the techs cursing about engineers on a daily basis. Engineers are highly educated but not necessarily smart:)

[@fabzacres-blackcat]

IF you are an engineer AND you have a machinist/welding / fabrication background then you are unstoppable 😀

[@jeffhuntley2921]

@@fabzacres-blackcat yea I’d agree. I’ve met some pretty dumb smart people with engineering degrees tho. Most fabricators have a lot of real world experiences not just a bunch of book smarts

[@michaels3288]

They are smart until you get the punchlist.

[@MrFreeknassty]

So much info , I'm really thinking I'm in @tinmanssaw class sitting in the front row and raising my had asking questions... with I could get a college credit for tinmans class or learning. Lol keep the info coming I'm really trying to keep up. More and more parts I got to buy after this video again. Running out of coin .. lol . Great video how lucky for your time to share all you info , tips , tricks etc.... tyvm @tinmanssaw