Re-doing my chainsaw hybrid the right way!
- Thread starter Sloppyslopster
- Start date
Sloppyslopster
Active Member
Jb weld will be perfectly fine. Especially the marine weld. Its not going to blow out of the case, if anything the bearings would go first. Jb weld has a compressive strength around 4000 psi and it does not like to come off so I'm not too worried.
robe
Well-Known Member
We like to say, as Mr. Dow said, Better living through chemistry.
Glue up that big hole on a hot motor with masking tape as a backer. Sure, sounds like a long term solution to me. Ha.
Sloppyslopster
Active Member
Well it is better than using a copper plate as a main block off source ha ha. Marine weld can handle 550F at a constant rate and 600+ for about 10 minutes and apparently 5020 psi of pressure. And I don’t really think the bottom of the jug is going to exceed that especially when the fuel will be “cooling it”.
Speaking from experience the copper plate leaks ALOT. I’ve attached a picture that shows how bad it drenches gaskets. And speaking from I guess a physics stand point. The 460 by itself can’t apply direct pressure to the copper plate over the transfer ports. In fact it would be pushing it upward a bit since that 50x55 ish size area is the only part with direct pressure. It will be kinda like a piece of paper floating and you push down on it. What happens? The middle goes down and the edges go up.
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Sloppyslopster
Active Member
Update: Been awhile only because I was on vacation and waiting for parts but good progress has been made! So I finally was able to attach the cylinder the case and modify the piston in order for it to take a 10mm wristpin. The mod actually work super duper well just need to shorten the wristpin a bit but that's not too hard. But one small problem, when I bought an 80cc/66cc crank I'm still getting the intake blowback problem, although it is slightly smaller than with my old crank. I also noticed it is rock solid at TDC which tells me it is a 38mm crank so this might just be a casting issue that I might just fill in with Marineweld. Pictures are below.
Now that I'm on the easy parts. I just need to balance this crank (hopefully around 70%-75%) and fill the transfers and then button everything up.
Now that I'm on the easy parts. I just need to balance this crank (hopefully around 70%-75%) and fill the transfers and then button everything up.
I just read this thread sorry to point this out mate. It's strange nobody has considering your battle
Yd100 bottom and ms440/60 doesn't need cylinder stud redrilling. U just order thread adapter inserts m8-m6 and then file out the holes slightly on the jug. If u want it last more than a few minutes having it accurate helps
The 38mm crank swap is correct and if u have the squish correct at this point?the problem with some of the cheap jugs is the ports can be miles off compared to oem and will be disappointing at no fault of your own
I used af80 rod 12mm pin and swapped it onto a 38mm crank.
Yd100 bottom and ms440/60 doesn't need cylinder stud redrilling. U just order thread adapter inserts m8-m6 and then file out the holes slightly on the jug. If u want it last more than a few minutes having it accurate helps
The 38mm crank swap is correct and if u have the squish correct at this point?the problem with some of the cheap jugs is the ports can be miles off compared to oem and will be disappointing at no fault of your own
I used af80 rod 12mm pin and swapped it onto a 38mm crank.
Sloppyslopster
Active Member
I believe you're mistaking the ms460/40 cylinder with the ms380. The ms460, at least to my knowledge, it 50x55 and this definitely showed after drilling. The ms380 is 50x50 and works with the thread adapters. My crank has a zm80 rod on it and was said to be for a 80cc/66cc engine so I'm just assuming casting were bad and just need to be filled. Squish hasn't been measured yet but but it seems the gasket will give me the desired squish.
Na mate iv built 3 of them
How do u know if u have cross talk if u dont have the cylinder at the right height yet?
Have u measured the stroke? Not only are there big differences in stroke lengths. But the rods are mixed n matched all over the place. Measure it all
