T head engine by Brian

[brian Rupnow]

After painting and reassembling the engine, it looks lovely but it won't start. It won't start because it has lost compression at the valves.
It started and ran fine earlier this week. The painting process didn't involve any of the things that would make the valves leak. Valve timing and ignition timing have been checked, and they are "spot on". The only difference between this engine and other engines I have built is the exceptionally long guided area of the valve stems. I have a theory that the longer contact area is creating enough friction on the valve stem to keep them from closing properly. First and easiest thing to try will be stronger valve springs. If that doesn't fix things, then my other idea can be seen at the right hand valve in the drawing. The lower portion of the guide area of the valve cages would have a clearance from the valve stem, and an inserted, concentric supplementary guide Loctited into the very bottom. This may well be the reason that Vederstein couldn't get the valves to seal on the t head engine that he built.

[aostling]

I will post one more video of this engine running, and then, as Bugs Bunny would have said--"That's all folks!!!" . . .

Running, and driving a load perhaps?

[Willy]

What rickt said.
The insertion tool will just consist of a 10-24 screw with a protuberance on the end of it in order to catch and drive the tang at the bottom of the insert.
In addition to this and the STI tap the kit will also consist of a drill of the proper size to accommodate the STI tap.

[rickt]

The taps are special. They should be labeled "10-24 STI " for screw thread insert. I have made the inserting tool from a screw or bolt.

[J Tiers]

"Have to"? I know of folks who say no. I have several helicoil kits of various sizes. They have a tap and an insertion tool in them, and that definitely makes it easier. I have not needed to do it without the tool.

Others say the taps are just standard ones, but the ones I have do not seem to measure to be standard.

[brian Rupnow]

Question--do you have to have a special tool to insert helicoils? I have a couple of 10-24 threaded holes in my aluminum cylinder head that are getting kinda funky. I can buy a bag of helicoils for $12, but I I buy a "helicoil kit" the price shoots up to $45

[brian Rupnow]

Tundra--I currently have about 40 engines. About 1/2 are steam and about 1/2 are internal combustion.---Brian

[Tundra Twin Track]

Great Job Brian,the fan looks pretty cool and the orange really makes it Pop.You mentioned you’ve been machining for 13 yrs.,how much Engines have you built?

[olf20]

Great engine, great job! As I have said before, I learn something new about machine
shop work every time you build a engine. Thanks
olf20 / Bob

[Ringo]

Very nice Brian

[chipmaker4130]

Save those farts! A methane-powered model would be a first for the forum!

[Cuttings]

Looks good as usual Brian. You can design and build a half dozen engine while I am still farting around with one.

[Toolguy]

Looks great, Brian! Just in time for Halloween, too.

[chipmaker4130]

Love how it all came together. I really like the color scheme too!

[brian Rupnow]

So here we have the engine dressed out in all of it's pretty colors. I had to get my good wife to take the pictures with her cell phone. Right now it is taking better pictures than my $700 digital camera. I will post one more video of this engine running, and then, as Bugs Bunny would have said--"That's all folks!!!"