Webra T4-40 A Look Inside

I look inside to see if there is any damage from the unsuccessful run attempt.
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[@Irvine7214x6apc]

Glad there was no damage whatsoever inside the engine, at least that's out of the way as a possibility. Really wishing you better luck on your next attempt David ;) Regards Harry

[@dmrcflyr2]

I think it simply got hot….. It seemed to draw fuel fine when primed. Plug was good. Hope to give it another shot tonight maybe.

[@Irvine7214x6apc]

@@dmrcflyr2Could be, why not. Best of luck on this next run David ;)

[@calvinharned6421]

I always like being able to see inside.

[@TestECull]

6:23 I had that happen with an HP 12 I bought from my LHS for peanuts. I tried for a couple hours to get it to run and it would barely even pop. So, in a fit of frustration, it got chucked in my 'engine drawer' and forgotten about for a couple yaers. Then I get my hands on a SIG Tri-Star kit which calls for an engine of that size, and because the HP 12's snout unbolts, I can easily retime it to run in reverse which opens up a TON of prop options on a pusher plane like that. So, I retime it for reverse rotation, mount it on the stand, go back outside. FIFTH FLIP STARTS UP RUNS LIKE A BLOODY OS! I can't tell you why that's how things transpired but it earned a permanent home on the back of that 10-size canard. On this Webra...I loathe timing belts and I imagine getting replacements for these is nearly impossible, so I would never fly one, but I would like to have one of these Webra 4-strokes in my collection just to say I own one.

[@dcdurbin1]

I wonder if the belt should be installed during reassembling the head, i.e., put the belt on and then bolt down the head. I don't actually know. It just seems worth a try if you ever find yourself doing it again.

[@dmrcflyr2]

I believe the way I did it is best. How would you keep the timing correct if the head is not on first? Having done this on several of these this way works for me.

[@keithgoode9726]

Interesting engine for sure. Glad there were no grind marks. Headed to the short!

[@johnchadwick3237]

Hey Dave. Respect, you kept your cool. Some days best to leave it in the box ( the engine that is). Thought only diesels played hide and seek. I heard calming music, wind chimes, song birds, even the lonesome locomotive! Rotary valve. Wow. Please do a vid on that. Are you sure the plug is OK? As you say, no reason it shouldnt fire at least. Bests fromdieselland john

[@luisgarza2036]

It's good to see there is no evidence of grinding or anything. Really interesting engineering.

[@DonDegidio]

Hi David, While watching the video, I think I see a mark on the aluminum pulley that may be a timing mark. It appears to be at the 8 o'clock position when you replaced the timing belt with the crankshaft at TDC.

[@dmrcflyr2]

Thank you but this issue has already been resolved. Watch the latest videos.

[@donaldhoppe1470]

Dave, looking at how far the OS glow plug extends into the compression chamber, maybe a short thread plug will produce better combustion? Just guessing. Dang, putting the belt on and while retaining the rotation of the crank and the rotary valve seems way to difficult. I suppose Weber’s had a tool that makes this so much easier. Looking forward to the next attempt.

[@dmrcflyr2]

A long four stroke plug is what is recommended. There is nothing wrong with the plug or length. Besides I have the engine running now.

[@airraptor]

You don't have to run a four stroke plug. The F plug is a great plug though as I run it in all my .40 and up glow engines two or four stroke.

[@johntrevick2060]

Interesting. I have the side mounted carb version and the marks are more obvious.

[@b.w.oostdam8875]

I would have liked to see if the rotary valve was not rotated 180 degr. so that the intake port had bomce the exhaust-port.... instead of trusting on how it was put together from the factory.

[@dmrcflyr2]

Oh well. I have faith in how Webra assembles engines. Not so with any Chinese made engine however. The way the valve is retained in the engine, with internal threads on one side only make screwing this up during assembly impossible.

[@johnchadwick3237]

@@dmrcflyr2 Also, comp was OK, was it not?

[@dmrcflyr2]

Yes compression was very good for a new engine.

[@johnchadwick3237]

@@dmrcflyr2 back to the bench, then!💥

[@harveynewman4333]

you can install the rotary valve 180 out from tdc. the engine will still be in time. the rotary valve spins half the rpm of the crankshaft. the same as a camshaft in a engine with poppet valves.

[@SomeGuyInSandy]

Timing. Imagine that.