HOW TO FLY CUT PISTONS

[@hughobrien4139]

I’ve been an automotive machinist for over 30 years. I’ve never cut valve pockets this way, however it’s a very good way to get it done. This will ensure your valve pocket is square to the valve head. Considering the fact that valve guide centers and angles can be slightly different and not perfect this way can ensure that each and every piston is square to that particular valve and valve guide centerline.

[@b.c4066]

Level up the bank you're working on, fill the valve relief with w/d-40, slow drill speed, steady pressure and you'll have less chatter. Then when done, bond a piece of fine grit paper to a valve of the same size to polish and smooth the newly cut valve relief.

[@reidsanders3552]

Problem with that is the Gen V piston doesn’t have a valve relief on the intake to hold any amount of WD40. Can only really get a coating on the face. But wD would help reduce chatter. The chatter is so fine if you were really worried about it some 400g would fix it quickly

[@chehystpewpur4754]

@@reidsanders3552 chatter is bad so he is worried about it. i would be too honestly. yes a flat surface wont hold it for long but i promise you. machinists and engine builders have mastered it long ago. a dripper or another squirt. gear lube is great when you need a lube that sticks and so is actual grease or assembly lube its nice and sticky/tacky but liquid when hot so it doesnt get in the ways. atf is pretty great too. it cleans and also lubricates . ill refrain from making any ex girlfriend jokes and what not because were adults and im always happy when im single... chatter can cause some pretty bad damage thats unseen before its too late and looks like something else. smooth and steady/slow is always best and sometimes it just takes too long.

[@davidmiller4594]

You actually want to speed up the cutter and/or slow down the feed rate (pressure) #speedsandfeeds

[@HoleshotKFX400]

@@davidmiller4594 to eliminate chatter? lol its the other way around slower speed more feed. you can oscillate spindle rpm also to limit chatter, or hit the sharp edge of the cutter with a diamond file to dull it a bit for more load.

[@whiplashmachine]

@@chehystpewpur4754 We machinists and engine builders usually just do this on our milling machines, never any chatter. This way has been a proven to work backyard method though.

[@dinorains9145]

When I started learning how to work on engines and cars I've messed things up and broke things in the past but I got better at doing it and I've been working on cars most of my life that's one of the reasons why I enjoyed watching your videos because you're teaching me things I didn't know how to do. So keep educating me. 👍😊

[@robertheymann5906]

Anytime someone gets into cutting on pistons usually means they are stepping up their game. That space and shape, not JUST the head, is worth spending time on. Great job

[@britneyautomotive]

I’m skipping a level and going up 2🤪

[@robertheymann5906]

When we built dedication race gas NA motors with 14:1 plus compression piston crown heights/ shapes and valve pocket machining gets critical. Be bold and take big swings at stuff if the budget allows and your learning curve will show it. Skip 2 levels!

[@MrDilley777]

How do you keep the aluminum shavings from getting down in the piston ring area???

[@britneyautomotive]

Just vacuum it out.

[@ericcouch7583]

I love the knowledge you put out there for everyone!! It's nice to have a woman with the experience and knowledge and the drive to actually learn and teach others. Your awesome!!! Happy Thanksgiving!

[@britneyautomotive]

Thank you!!!

[@chrislowery185]

I love that "I'll be in my office" shirt. That's one of the best "car" shirts I've seen in a while.

[@britneyautomotive]

It’s from speed society!😂

[@gentimusic]

I'm learning out here, thanks to Britney Automotive

[@britneyautomotive]

Thank you!!

[@aviciitiesto8076]

I am impressed by your dedication!! Aldo clean and tidy! Gooood! 👍🏼😉

[@britneyautomotive]

Thank you!!

[@tristanh4007]

Just something to note for anyone fly cutting pistons, the piston and valve aren’t closest at tdc, you should probably find out at what degree the valves are closest to the piston and cut the pistons there. A lot of the fly cutters are oversized so it shouldn’t matter much if you don’t though. Keep up the great work Britney, I love a good build series!

[@themotocrossmodchannelWulfMX]

The only way to really determine TDC is with a dial indicator and some sort of way to lock the crank in place for every piston cut so you know when the needle stops moving, you are at TDC. .120" (or 3mm), is a decent amount to cut. Some sort of cutting oil would work to help keep the cutter teeth cool and lubricated for a smoother cut. Im not sure if this mod is specific to interference motors only, but in non interference, not matter what position the valves are at they won't ever come in contact with the piston head. This mod will also inadvertently lower the comp ratio of the engine (not by much), due to the trapped volume of the motor being larger now that less material is in each cyl. Great video!

[@xtfairmontlover]

10 degrees before TDC & 10 degrees ATDC is where the valves are closest to the piston.

[@shanerorko8076]

It doesn't matter though, if you need 120 thou of clearance you can cut it out anywhere on crank rotation, 120 thou from the crown is still 120 thou off the crown.

[@ayuse01]

@@shanerorko8076 True statement sir.

[@reidsanders3552]

@@shanerorko8076 bingo…. Doesn’t matter where you cut it.

[@johntwigg8162]

In addition to the suggestion of WD-40 I find the product that goes under the name of Alumtap is truly fabulous for clean smooth machining of aluminum.

[@minecrafthacker9582]

It makes my heart happy to see another young person who clearly has a passion for engine building

[@britneyautomotive]

Thank you!!

[@earlscheib7754]

This young lady should have a million subscribers by now!

[@britneyautomotive]

Thank you!

[@joecameron3406]

This is kewl. Can always learn something. I've had a lot of 1st time experience over the years building fixing and repairing these 5 wheelers. 4 on the ground and 1 to aim it LOL

[@britneyautomotive]

Always lots of learning to do!!

[@TheJagjr4450]

The sharp edges can cause preignition after fly cutting, softening the sharp edges by handworking with a small drum sander helps immensely. IF not coating the piston tops - lightly glass beading the tops allows the piston to accept a nice even carbon coating which acts as an insulator on the piston top also keeping hotspots from forming.

[@moabman6803]

Seems like even after removing sharp edges that the raised areas could still create hot spots.

[@TheJagjr4450]

@@moabman6803 Unless you are running the engine hard for longer time frames none of this really matters. The things I am talking about are only done in a fraction of a fraction of race engines.

[@moabman6803]

@@TheJagjr4450 I would say it depends. If you have a ridge next to the pistons edge from flycutting I would think it could cause preignition readily. Only way to know would be testing.

[@johnnyholland8765]

I could never argue with you. You can work on my stuff anytime... Never seen that done before. Very unique tooling. Don't sweat it if you screw up. That is how you learn. You need a bigger half inch drill with variable speed and not the battery ones. Get a corded one because they are stronger and more controllable. Use a cutting fluid (Tapmajic) for aluminum works great and use a slower speed. Chatter comes from excessive speed. You can also make a roughing cut at 2/3 depth then come back with a finish cut if chatter is a problem.

[@farukthehandyman3650]

I'm not a car guy. I just found myself here. Salute to men of culture.

[@davidvazquez5795]

Happy Thanksgiving Britney. Thanks for channel

[@britneyautomotive]

Happy thanksgiving!!!

[@davidvazquez5795]

Keep your channel going, & happy Thanksgiving to you & all you're family.

[@Jim-fe2xz]

You can do a lot with knowledge, skill and patience! You don't need the latest most fancy machines to do acceptable work. I've built many engines with my old school (50's ventage) cylinder boring, honing and valve and seat grinding equipment and gotten lots of life out all of them (besides consistently passing emissions testing requirements). Thanks for sharing this skill!

[@Rcchristmas7887]

Good training! I don't know much about the technical side, but trying to learn so i can do a fresh build for my Camaro! All the info you share is great! Thanks! Hope yalls Thanksgiving was great! Take care!

[@britneyautomotive]

Thank you so much! Happy thanksgiving!

[@leonardalcalaii9277]

@Britney Automotive Good job!!! You were taught really well. Your a great teacher. My 1st Intro Automotive College classe was a lady instructor like you ✌😇🔧

[@britneyautomotive]

Thank you!!

[@undisputedtruth4954]

I don't even know what's more impressive, but dang it I am impressed. My repair skills stop at alternator/water pump/radiator/tire & oil changes. Oh, I almost forgot about the battery. I can also change and charge a battery!😂 Someone is gonna get hella lucky wifing this woman. He's actually gonna learn something useful in life.

[@britneyautomotive]

Thank you!!

[@vinnylc]

The piston will always outrace the valve coming down or up in the bore. The reason we fly cut is To compensate for the overlap when the intake valve is opening before top dead center an aggressive Cam. On the exhaust side PTV is not that big a deal unless you're in a full blown race Cam. Keep up the good work! 👍+- 15* TDC is the problem area on split overlap.

[@MrPdforeman]

Great video ! Very pretty & knowledgable!!!

[@britneyautomotive]

Thank you!!

[@WarrenHester1]

Very interesting and useful information. This fly cut tool is exactly what I'll need in future. Thanks for sharing Brits 🤗

[@britneyautomotive]

Thank you!!

[@paulventh7034]

And it is great to see young and older ladies doing this stuff because my Mom did right out there beside my dad so keep the trend burning rubber

[@britneyautomotive]

Thank you!!

[@paulventh7034]

@@britneyautomotive No darling I thank you because other women will see ladies like yall and then other ladies will get out and get greasie with there partner or mother or even their dad so thank you

[@tonyt8805]

Great job Britney....🎊 👏🏾 👏🏾 👏🏾 👏🏾 🎊 I was nervous as hell my first time! 🙈 😕 🙈

[@britneyautomotive]

Thank you!!!

[@timmygiles9554]

I love big cams and that’s the only way your going to run one!!! Happy Thanksgiving girl great videos

[@britneyautomotive]

Happy thanksgiving!!! Thank you!

[@johnwhelan723]

Learn something new everyday, impressive work

[@britneyautomotive]

Thank you!!!

[@MrTimNed]

Nice job Brit, killin it. Happy Thanksgiving to you and yours. Peace and Love, Tim

[@britneyautomotive]

Happy thanksgiving!!! Thank you🤍

[@kennethhacker3014]

Great job girl...I enjoyed it.

[@britneyautomotive]

Thank you!!

[@jbrownnn100]

The look of determination!! Another awesome how to video 🙌🙌🙌

[@britneyautomotive]

Thank you!!!

[@xanderx4131]

I have to rewatch these like ten times bc I keep getting distracted, stupid eyes 😂 Happy Thanksgiving gorgeous ❤️

[@britneyautomotive]

Thank you!!

[@AndyFromBeaverton]

It would be interesting to see some micrometer measurements and maybe a weighing of the pistons before and after. Symmetry is good.

[@britneyautomotive]

Coming soon

[@AndyFromBeaverton]

@@britneyautomotive Sweeet!

[@bluea75]

Awesome job cutting the pistons … happy thanksgiving

[@britneyautomotive]

Thank you!!! You as well🤍

[@opiealvin]

Glad you told it straight. No dancing around. Just your real opinion. Good work Britney. I've been told before not to bother fly cutting unless you have a real clearance issue.

[@britneyautomotive]

I will most certainly have clearance issues with what I’m doing

[@dennisallen9830]

I must say you taught an old dog a new trick. I've heard of this but have never seen it done. Thanks

[@britneyautomotive]

Thank you!! I’m glad🤍

[@Cheechofficial_]

This should be your favorite woman/automotive channel !!

[@britneyautomotive]

Thank you!!!

[@Cheechofficial_]

You’re welcome!!🤘🏼

[@keithjagarnath5137]

We been doing this with older valves cut on face.

[@cameronbarsby4605]

i hope you are doing aluminum pistons if those worl with nitrous i dont know much about nitrous but i have aluminum pistons and they are soo light my next step is a light weight crank which hope you are doing also i have high hopes for this motor

[@YerkitRacingChannel]

You have the right mentality! Get in the shop, get uncomfortable, make mistakes and learn! Have ran fly cut pistons before with no problems also

[@britneyautomotive]

I agree! Uncomfortable means your learning

[@chriscorts3337]

Wonderful. Remember folks, sometimes you have to go slow to go fast.

[@britneyautomotive]

Facts

[@tonyedge540]

I did it on my 302 it worked great just make sure you have good lube on the tool or you will prematurely wear out the valve guides, good job enjoy the beauty of engine modifications 👍

[@jesseswonger9699]

Happy Thanksgiving . Glad to see you haven't acquired any more neck wounds.

[@britneyautomotive]

Haha no more yet😂 Happy thanksgiving!!

[@capcadetNH]

I have never heard of fly-cutting pistons. Learned something new

[@britneyautomotive]

I’m glad!!

[@andrewmichael814]

Thank s for the info Britt, and HAPPY THANKSGIVING to you and ur FAMILY. 🤘🇺🇸.

[@britneyautomotive]

Happy thanksgiving!!!

[@andrewmichael814]

@@britneyautomotive 👍🦃🇺🇸.

[@alexrivera4337]

Happy thanksgiving 🦃 to you and your family. Have a blessed and wonderful day GORGEOUS!

[@britneyautomotive]

Thank you! Happy thanksgiving!!

[@adamaugust9190]

Awesome Video about to do this on my sbc 350 for the first time to clear a nice .600 solid roller

[@Mattlt1]

Very cool! I'm curious if this changes compression ratio. Very little if any I'm sure.

[@1975napier]

Very cool video! Thanks for bringing us along on your learning experiences. Much appreciated!

[@britneyautomotive]

Thank you!!

[@garrettcarpenter3319]

Did you use the same tool for both the exhaust and intake side

[@britneyautomotive]

Yes

[@garrettcarpenter3319]

Awesome I think I am going to buy one and try it do you know if they make one for old generation sbc valves like 2.02

[@agoodneighborautorepair2176]

Very nice explanation;blessings

[@britneyautomotive]

Thank you!!

[@georgesam7805]

Good ole backyard hacking. That’s what makes this stuff fun I once resurfaced a set of Chevy heads with a brick. It worked awesome. Little gasket sealer and it ran all summer. Do you have any other pages to view ?

[@StreetRacingChannel]

Those are some high dollar pistons now that the world famous Britney automotive fly cut them.

[@britneyautomotive]

Haha we will see😂

[@copperh1722]

Awesome content just wanted to tell you that I appreciate your content!

[@britneyautomotive]

Thank you!!!

[@JohnThomas-vb9se]

Was the tool from Lindy? I’ve bought cutters from them before. Great to deal with.

[@britneyautomotive]

It is!

[@gabrielsegura3358]

Awesome video! Have a happy thanksgiving. Eat lots of green bean casserole!

[@britneyautomotive]

Thank you!! I will🥰

[@deandee8082]

you do a fine job, can't you use a cutting oil on that tool? may reduce chatter?

[@tornado_8554]

Se ve genial!sii

[@britneyautomotive]

Thank you!

[@bfed-1220]

Britney great video. Can I ask you where you purchased the fly cutter?

[@brxezo]

Happy Thanksgiving my love enjoy the holidays

[@britneyautomotive]

Thank you!! You too!🤍

[@shanedevlin6097]

Happy Thanksgiving to you and your family and friends

[@britneyautomotive]

Thank you!!! You and yours as well!!!

[@jamest.5001]

Clarence, can't live without him,

[@britneyautomotive]

😂😂😂

[@SILVERBULLETSS86]

Have to keep that in mind, question where the best company to get them from?

[@britneyautomotive]

The tool? It’s from lindy

[@SILVERBULLETSS86]

@@britneyautomotive Thank you, Happy Thanksgiving while I'm thinking about it do you know anyone who has junk ls engine blocks basically the bores can't be be fixed.

[@wtf0101]

Nice video 👍It's top TDC clearance,

[@adamhawkins243]

Her subscriber count seems like it's going up hella fast. That's awesome she deserves it

[@britneyautomotive]

Thank you!!!

[@SirUncleCid]

Attractive mechanic girl LETS GOOOOOO

[@davidmiller4594]

Yup! That's what being an enthusiast is about. Trial and error.

[@britneyautomotive]

I agree🤍

[@ronfreeman4999]

What is the benefit to flycutting pistons? Just curious. Thanks

[@britneyautomotive]

I explain it all in the beginning:)

[@johnmatthews2198]

Very nice work, didn't know you could do that, Great video, thanks for sharing

[@britneyautomotive]

Thank you!!

[@billshiff2060]

That cutter is not designed to limit chatter. It can be designed better than that.

[@britneyautomotive]

Tell lindy that.

[@billshiff2060]

@@britneyautomotive Anyone who designs a cutter like that should have known. Any good machinist will see right away that those teeth will be chatter city. My telling lindy won't do anything they should have already known but don't , but telling you might work because you might seek a better cutter elsewhere. Better still you might recognize that this is a barn yard bandaid procedure to try to substitute for properly cut valve pockets done in a milling machine. You deserve better than that bandaid.

[@danielvick7875]

Great content thank you!

[@britneyautomotive]

Thank you!!!

[@gilbertoquinonez1974]

Yo I can't believe I missed the video when it came out I'm slacking but it is 5:15 am LoL love showing love for the channel...! 🤘🏼💯

[@britneyautomotive]

Haha thank you!!!!

[@rayrussell6064]

I'm proud of you Brittany it was scary the first time I did it back in the day but after that it's just a matter of going slow and take your time. Congrats to you for trying. God bless and as always be safe 👍

[@britneyautomotive]

Thank you!!!!

[@caskisner]

Keep pushing❤😊

[@immanutt4442]

in the days of old high dome pistons were solid dome and were fly cut to finish with no issues - now with the hollow done pistons today ...

[@zeeelander]

Wow, kinda speechless. I could write a book on what I just saw, on so many levels. But good shit fr.. 💯

[@britneyautomotive]

Thank you!!!

[@timothyheller2580]

I think you are doing a great job and happy Thanksgiving

[@britneyautomotive]

Thank you!! Happy thanksgiving!!!

[@DiyAllaroundguy]

Is this to help eliminate detonation ?

[@JoeBeech]

Great video never seen that before and happy Thanksgiving have a nice day 🙂

[@britneyautomotive]

Thank you!Happy thanksgiving!!!

[@muppetgump8522]

Great job 👍

[@britneyautomotive]

Thank you!!!

[@ajw6715]

I learned something new. Thanks.

[@britneyautomotive]

Thank you!!!

[@ajw6715]

@@britneyautomotive Your welcome. Have a great night. AJ.

[@theoldmansgarage]

Good job kid.

[@britneyautomotive]

Thanks bill🤍

[@justinandnickybrock7463]

Been waiting for Richard Holdener and BTR to do this video but there's no way they could hold my attention like you did. 😉 thx for the video.

[@britneyautomotive]

Thank you!

[@_ITSJOSH_]

Have a great Thanksgiving Britney!!! 😁

[@britneyautomotive]

Happy thanksgiving!!!

[@superrodder2002]

Isky Cams has been selling a similar type fly cutters for decades. fly cutting pistons is normal for race engines because high lifts and long durations keep the valves hanging into the cylinders farther and longer than street cams do. There is only so much area in a combustion chamber so pistons has to be modified to clear the valves.

[@britneyautomotive]

Yup

[@alexrivera4337]

Gorgeous and smart! Gr8 information tnx

[@britneyautomotive]

Thank you!

[@artegarcia2184]

hello Britney you are a very interesting person for what you do I like to see you in your videos greetings from Mexico 🇲🇽 sincerely your number one fan

[@britneyautomotive]

Thank you!!!

[@kartguy]

Love your valve spring tool! Nice and bulky! They should sponsor you for them pants as well too, you know what I'm saying :D Whew! I heard of fly cutting, but thanks first time seeing it pretty cool and legit since using the valve guide. Happy Thanksgiving enjoy yours!

[@britneyautomotive]

Happy thanksgiving!!!

[@theegwana2103]

That’s a cool tool I’ve always done them in the milling machine

[@jamesmoore8298]

Have a question on the fly cut. Would this be used for high rev/ high performance engines. Would there be any benefits for stock to slightly modified engines? Your thoughts please.

[@lawofliberty3517]

If you're already at that point, might as well. If not, it ain't necessary for typical dailys.

[@confuse9]

So if you fly cut, do you have to re-balance the motor?

[@britneyautomotive]

You do not!

[@cedricwilson2055]

No mention of where to rent/ purchase that cutter. Isky may still sell one but hadn’t seen it in a while

[@britneyautomotive]

Lindy but isky does too

[@ericsmcmahan]

Where do u order fly cutters like that?

[@britneyautomotive]

Lindy!

[@peted5217]

Using a layer of wide masking tape across the cylinder tops will capture the filings. Had to do this to a set of LT pistons to use on a LS engine since valves are reversed on LT types . Purpose was for more compression the LT piston dome provides.

[@pipermacnabb4537]

This method works fine....but I prefer using an actual fly cutter on a milling machine it goes way faster

[@Tier1Norseman]

She cut it so well, even my pistons went flying!

[@britneyautomotive]

Haha

[@randychong5395]

I'm curious, is it possible your fly cut depths could be off depending on the mating surface of the head and block? Ie. If they aren't decked and the heads aren't torqued to spec when cutting, wouldn't your valve to piston clearance change when the heads are torqued to spec? Keep up the good work, I enjoy your channel 👍

[@britneyautomotive]

You have to measure the actual piston after cutting and determine how to make them the same yes.

[@MrToppox]

😈😈😈😈 yeah girl , awesome mechanistic know how and thankyou for sharing it 😈😈😈😈

[@shadjohnsen8143]

How do you determine how deep to fly cut? And how do you determine the factory thickness of your piston before starting?

[@britneyautomotive]

Believe it or not, Its all about testing. I'm looking at a comparable build so I know how much

[@LexNoLuther]

Nice channel. Your super smart ❤️📝🥂

[@britneyautomotive]

Thank you!!