In todays video we show how we bring this Lotus Twin cam cylinder head back to life by fitting new valve guides and new valve seat inserts with mew valves
I love watching your channel and like how you guys work, but I have to say please treat yourself to a new copper, hide hammer, a colleague of mine had to have a piece of copper removed from his thigh by a surgeon from his worn out copper hide hammer after a piece flew off when used in anger. Andy AA Keep up the great work chaps 👍
@@andyk1882 Not suggesting that stupid people having a laugh are advised to play with it or indeed sharp instruments that Matron hides away from you. As a responsible trader it is available. Liquid Nitrogen is used quite extensively in high class restaurants these days for example.
@@johnglover9935 thanks but you still have not said where to buy please? where did you work when you used to soak them in it? liquid nitrogen in a restaurant ? rofl
interesting just curious any idea what caused the gouges in the head on the first 2 cylinders. Laughed at how quick you flicked the valve seat away. I had thought that's cut out of centre.
Lee, love all the videos you post, and I look forward to the latest one every other day. Have to pull you up though on your promise from last week to refer to your audience as ‘everyone’, and stop referring to ‘guys’. A hard habit to change. Other feedback, would love to see you do a time lapse (condensed to 30 seconds) build of a whole motor, a full crank grind, or even say all valve seats cut on same head. They are great ways to show how much back and forth repetitive actions it takes to complete something. Cheers, John
Absolutely no reason to apologize. In a way, today's episode was one of the best. Camera held well, minimal movement, dialogue couldn't be any better even if it was scripted. That was an excellent 'show and tell'. That 'mechanically intelligent' centering cutting tool is fascinating. Jigs and clever tools are magical sometimes, and that one certainly is. I watched that intently start to finish, I don't know if I even blinked. One question: Before using the seat bonding compound, wouldn't a quick clean...either a rotor bristle brushing, or a chemical cleaner (Some paint strippers are excellent for removing burnt on carbon, beware of over-etching the metal if alloy) be advisable to maximize the bond between the insert and host? If done judiciously, the micron loss of surface could be replaced by the thickness of the bonding film. Heat transfer might also be increased, the assumption being the bonding agent is conductive. I can see a case to be made both ways, but if done *carefully*, I'd lean towards prepping both the outside of the insert and receiving hole in the head. . The bonding compound might advise against it, I don't know....
One thought for you. When you replace seats the valves can end in a different position creating uneven compression. I always used to CC the head volume at the end to make sure we were where we wanted to be compression wise.
Why don't you run a bead of weld around the inside of the valve seats and the weld shrinks the seat and they fall out just like the big one piece press in wheel bearings?
To remove the seats without cutting into the aluminium, weld around the ID of the seat. As it cools the seat will shrink and fall out. When the new seats are installed, center punch a few places around each seat to prevent falling out. Then the seats can be finished. We used the same technique to remove liners from Isuzu blocks. Dry ice to freeze the liners for installation.
Don’t think whacking an insert in with an old gudgeon pin is a great idea. A proper cantering tool and correct size drift is the way I used to do it. Otherwise always the possibility of damaging the insert or gouging the recess.
Whilst it may be 'accepted' practice to beat the valve guides in and out and valve seats in with a big hammer, it's very crude. You have a very nice Epco hydraulic press there, would it not be better to use that and some appropriate tooling?
Treat yourself to a new Thor copper hammer, that one looks like it's seen better days. Or may be send Isaac on another one of his drunken market missions! By the way, what is the name of the product you use when sealing the oil gallery plugs on crankshafts? Hematite?
Have you ever tried liquid nitrogen to freeze the valve seats and then no need to tap them in? You couldn’t use the retaining compound but can keep a good interference fit without risk of scoring the pocket in the head.
I would be happy with a vid EVERY day from you, i enjoy the content, but it must take time collating the vid stuff, out of your busy work day dealing with warranty nutters
is this engine the rover engine that they put into the 1800 freelander or am I thinking wrong and the more videos the better for me any way thanks for the video
Hopefully a far better job than the notorious head butchers Vegantune of Spalding Lincolnshire who ruined many a twin cam head in the 1980’s (it looks it!)
I love watching your channel and like how you guys work, but I have to say please treat yourself to a new copper, hide hammer, a colleague of mine had to have a piece of copper removed from his thigh by a surgeon from his worn out copper hide hammer after a piece flew off when used in anger. Andy AA Keep up the great work chaps 👍
