THIS LOTUS TWINCAM CYLINDER HEAD GETS FULLY REFRESHED
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- Опубліковано 4 січ 2023
- 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
- Авто та транспорт
The more video's the merrier!!
I was going to say the exact same thing.
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 👍
Great to watch you at work. Looking forward to more of the same.
We used to soak inserts in liquid nitrogen, saves knocking them in.
where do you buy liquid nitrogen lol ? 🤣 and all the gear and safety equipment needed to use it lol, ??? please tell?
@@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
@@andyk1882 Both the machine shops I use(in the UK) for this type of work have liquid nitrogen for seat and guide fitting
A Barum engines video is always welcome Lee, yeah thanks.
The “Guys” are back in town….. 😊
I look forward to all of your videos. Be good.
Lee, correct me if I'm wrong but it looks like that engine has had a past encounter with valve seats coming undone.
The no more ‘guys’ is going well 🤣🤣🤣
great episode! keep em coming
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....
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.
I thought the same cos it broke through on one side
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
Good job, looks like a winner, all the best to yous and your loved ones
just watched-- Titans of cnc machining -- Smal engine shop fights back. worth a look 5 min clip
Extremely interesting video ang nice machine also!
You can't make too many videos Lee 😜😂
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.
are you sure? surely if the valve was in the wrong position the compression ratio would be the last of your worries lol
Wow! You've practiced haven't ya...?
Interesting self centreing head on your boring jig .
Christopher from Down Under
Nice work.
I have watched a few of your videos.
I am going to subscribe to your channel.
Take care, Ed.
What did you use to heat the heat before fitting the inserts? How about pressure test? These heads are very prone to been porous.
Thanks lee Can you show us how you do the vacuum test?
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.
Centre punch? Really? Wow
@@99hjhmYes. In the aluminium which flares a small bit over the seat outer diameter.
Whatever happened to the guy in America with all the modern equipment he was going to give to you?
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?
omg, you animal 😂
Did you manually lap the valves with lapping compound, to perfect the sealing of each one???
would it be worth using an old valve to hammer the seats in and keep them centred?
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.
Heads got an inlet manifold cast in.
Removing the old valve seats by machining looks
very tricky and fraught with danger. I wouldn't have the balls to attempt it.
The more the merrier.
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?
Would the valve seats need doing to run on unleaded fuel or are they ok as original seats.
Faaakin ell that thor no.3's seen some miles!
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.
6:15 Anyone else notice the state of the hammer shaft?
So much for his recent pledge to improve H&S in the workshop.
Do you ever get any old Ford Pinto lumps come through? Random comment but ....
Guys guys guys..... I thought you weren’t going to say that anymore
Gave up on the 'guys' already 🤣
Hi, what cutter are you using to skim the heads.?
One that needs new inserts lol the surface finish looked atrocious lol
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?
lol yeah i saw that and immediatly thought it would be so much easier if the Hammer was slightly squared up
You should have asked Santa for a new copper hammer
Bet those lotus heads have been skimmed many times must be struggling to get good ones now
QED do them new in conjunction with Lotus from £2275 hth
How do you align the plane of the valve seat with the perpendicular of the valve guide?
It's set by the insert pocket really, plus when the insert is cut any discrepancy will be removed anyway because it's centred on the new valve guide.
@@samrodian919 Duh! I knew that in another part of my brain.
What was the result on the V6 oil pressure switch Thread repair or have I missed a video🤔
I think it will be In tomorrows video
lee you said guys.mmmmmmmmm
I think you need a new copper hammer!!
did you heat the head or freeze the valve seats or just bash it all together at room temperature i would have frozen the seats
how would you freeze seats lol ?
@@andyk1882 you letz em go
@@jackiemay9471 ok pal
@@andyk1882 house hold freezer works pretty well… lol
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
Warranty 😂
In Deutschland sagt man dazu Pfusch hoch 3
As an aid to pointing things out safely why not get a laser pointer.
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 that an Esprit engine by any chance?
This is the Ford based 1558cc engine fitted to Elans, Lotus Cortinas and some Europas. Esprits had the later Lotus 901 16 valve engine.
@@kevinbradley172 Thank you 🙂
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!)
Love the content but you are still saying 'guys'....
That's the worst looking copper hammer i've seen this year.!!
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 👍
you been watching too much tv, why not replace the floor aswell incase the concrete cracks lol