How to Machine custom valve pockets into COSWORTH pistons
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- Опубликовано: 10 сен 2024
- We show you the machining process in machining valve pockets into COSWORTH pistons. The reason for this is to enable greater piston to valve clearance when Erving hard or running bigger camshafts. Also, update on the Cosworth block with dropped liners
I think the machining videos are my favorite. Thanks for sharing.
Nice to see the workings of a real shop with all that entails. Thanks for sharing.
Almost as sketchy looking as your td5 manifold setup, but it obviously works just fine so no need to change it 😎
Although i do this every day i still enjoy watching how other people go about solving the same problems that i face at work. Keep the content coming 👍
you never know when you will see a "shortcut" that produces good or better results than what you have been doing for years.
edit: time is money in your world, less time is more money.
Definitely becoming my favourite channel. Showing how everything is done. Keep them coming
Great video love see video of you pushing old liners out really interesting 👍
We used to set boring bar to smallest bore then run it carefully down liner they then fell out, saved all that pushing and swearing and possible block damage.
What an awesome video..nice to see how these jobs are done..👍
Not trying to tell you how to suck eggs, but from much experience with liners of all types just bore with smallest radii that your bar will do down one 'side' of liner they will then lose the interferance fit and just fall or push out with fingers. Saves much cursing, pushing and block damage, liners are toast anyway. Whoever did the work prior is some form of engine butcher, i admire you for taking it on and not just saying not touching that take it back to the butcher.
The extra lip on the odd liner might be covering a a chafing imperfection in the block surface bore edge. I suspect there's a story in there somewhere, only one way to find out.
@@stephensaines7100 oh yes theres a story with that, as you say a cover job, will be interesting to see when liner out.
Absolutely nothing wrong with your Heath Robinson set up, it works so that all that matters. I have made sum rare looking jigs over the years to machine components and they work perfectly fine. Looks like an Abewood angle vice you have there, great vice for set ups like this.
Enjoying the channel, love watching the machining, especially on nice older machines.
I work on an old Lathe and Miller too, always have the doubt of 'did I tighten it up?'
My only concern when watching is put some safety specs on fella, swarf in the eyes isn't nice, or fun.
Keep up the good work, keep the videos coming.
Always fascinating! For that Cosworth 'for Dave' with the problematic liners that most likely will be pressed out, if you can, some vid on that operation would be most welcome. Bit of intrigue on the outsize one, only one way to find out the story. That block may have been destined to never be balanced and optimal with an odd liner.
Enjoy this channel very much
I'm enjoying watching your videos, very interesting, I wish I had your presentation skills,
Interesting video. I learned a lot. Thanks 🙏
Very interesting to see you put in the valve cut outs . Top job 👍🏻 ,wasn’t expecting the material to come away quite so quickly. I was surprised to see piston rings fitted, but I do suppose the alloy pieces are fairly coarse and clean away easily.
Very eye opening work on the cosworth block. Wondering why cylinder the liner had been fitted that way.
be nice to see if it’s been done for a reason or genuine mistake. Keep up the good work 👍🏻
Dave is a legend 😁😉
Hi Simon how you doing
I'm looking forward to the recovery job on the cosworth block and liners
Great to see the venerable old Bridport mills are still in use. Cut my teeth on these machines more years ago than I care to mention.
You're not supposed to use them for dentistry.... ;-)
@@peterh1386 lol...you beat me to it. I got flossed.
looking forward to seeing those liners come out cursing included
Very interesting indeed 👍
Another quality video mate keep them coming
I have seen a few seized bearing inner races removed by running a bead of weld around them, then as they cool they contract the race a little and loosening the race. Wonder if this technique would work with the liners ?
Nice work.
"bit of a moan"...LMAO! I love the difference in your version of English and our CORRECT version here in the states. 😜
4:39 The finger of precission 😁😁🤣🤣.
Hi, What make of milling machine is that please? It looks very solid and also has a horizontal spindle. Looking at the autochuck there seems to be a gap between the locking nut and the body. I was taught to screw the locknut loosely up to the body before screwing in the milling cutter and then locking securely with the spanner. Not sure how much of a difference it makes but might be worth checking just in case.
With the inlet valve relief leaving a thin material wall on the outside of the cut, do you not suffer hot spot preignition, or run-on as these are high compression engines? I actually like how you mount the pistons for machining, heath robinson or not.
The American version: Rube Goldberg
Hi . Would you weigh each piston after machining to ensure they are the same weight ? Also are you taking the same amount of material for all 4 recesses , which technically would mean they should still be in ''balance'' ?
Love the insight you are sharing with us , many thanks. Rgds Don.
Excuse my ignorance, but what cars are all these Cosworth engines being fitted to ?
No such thing as Heath Robinson think the point is Mate you have to do to get to where you want to be and if it works then that’s great well done mate enjoy your videos, you should’ve seen some of the weird gigs that I’ve worked on an aircraft factories that make your eyes water🤣🤣🤣
Totally agree if it works its good, ive done far worse with huge fly cutters and barest grip on work piece.
Question about the valve pocket sizing, is it ever adjusted to give a specific clearance volume (the un-swept volume of the cylinder at the end of the compression stroke) or is it a generous dimension to avoid new pistons being required if the cam profile is changed?
Its always the minimum needed to clear the valves, valve cutouts can affect flame front or cause a heat spot which can cause pre ignition.
Have you flat bottomed the slot drill or left it standard?
one question about your piston holding setup - I dont see any side to side location at all , so how can you be sure of cutout location ? I need to do the same to a set of pro stock bike pistons (running 16.5-1 compression with oversize valves) and very little clearance anywhere....
Can you do one on crank lightening and matching to the rods and pistons.
Not just balancing please.
Great vid , what are you using to locate the piston in the X axis ? I couldn't really see .
I've machined many piston crowns and I used a similar setup but had a boss diameter locating in the skirt ID and two towers either side of the gudgeon pin bores for a dummy pin to go through with flats on it for grub screws to clamp 👍
👍
When u say abouy heath robinson shop, the way i was taught would u trust a sparkeling workshop that looks like it hasnt ever been used or one thats a bit dirty with stuff out thats clearly been used a lot?
I would have thought having the cut outs so close to the edge of the crown would cause a hot spot area and potential failure ? As for it being safe. When I was trained with mills and lathes, we used magnetic guards to prevent swarf flying and arms and hands getting close to the chuck. Yes, its an old machine and stuff I used in years gone by but safety its paramount especially when you show videos that documents no protection etc. Just saying , nothing more. Otherwise a good update as normal.
Evening
What ! No eye protection whilst machining .
I never used it, can see perfectly from my good eye...
Great videos, I’m having issues with your websites contact form, have sent you a email
1:58 - Template unit
Tape that hammer handle before it splinters someone...great video
Don't let health and safety see it
possibly the worst setup for pockets ive ever seen...It may work but not a particularly good advertisement for yourself imo.
It's the troll you see that video didn't harte did it that is what you should be doing 😉. Not making excuses.
Busy day licking windows Martin? Seriously it’s time you stop drinking, nothing you ever write makes any sense 😂😂😂
@@mrbakerr1 dont think his lift goes all the way to the top. Failing that hes whacked right out of his skull and aint never coming back.
IT'S TOO LATE. WITH ALL THE BAD ENGINE/WARRANTY VIDEOS....I HAVE COME TO THE CONCLUSION YOU GUYS ARE NOT A GOOD SHOP. I THINK YOU INHERITED...OR FELL INTO THIS BUSINESS....AND ARE IN WAY OVER YOUR HEAD WITH A BUNCH OF ANCIENT EQUIPMENT AND OUTDATED TECHNIQUES.
Dont watch then, move on
Really why are you SHOUTING ?
I imagine more than half of the worlds engine machine shops are using outdated equipment, but the old stuff is the best. Anything new usually just comes from china and cnc machines are no good unless you're doing repetitive work.
Fancy shiny machines would not do the job any better, this chap has a very high reputation for his skills.
I should know I am a local.