Can Your Engine Handle BIG Cams Or a Shaved Head?

[@ohboyotero]

Awesome video. You're such an amazing combination of indepth professionalism (the whole video) and totally relatable DIY sketch ball (the vise on the intake stud) that i know I'm in the right hands 😂

[@TheCarPassionChannel]

Lmaooo that's a perfect description of everything I've ever built

[@acornhead50]

When dad says he's just going out for cigarettes, and he comes back ❤️

[@prestonhatherly1548]

greatest comment of all time lmao

[@NappMotorsports]

Nerded out watching this, but now I'm not looking forward to doing all this on my own in the near future... I really appreciate the immense detail you go through when you make these videos, I feel like I could send someone who has never touched an engine to your channel and they could build one from the ground up.

[@miatafied]

Thats literally what I did (accept I had done some vehicle mods before and general maintenance) I saved thousands of $ by watching this channel and learned a ton. Always learning more too. Glad to see Greg is back

[@JungleMotorSports]

be mindful when shopping for head gaskets of "compressed thickness" (aka thickness when it is bolted down) vs. uncompressed (aka out of the box). Cometic does offer several thickness options, and will custom make one.

[@Gios_JDM_garage]

I’ve read all 59 comments and only one person mentioned the Vsauce intro. Absolutely genius Freg. Keep it up. Shit had me hollering laughing😂😂😂

[@edekmito]

Best video you've done. I've just built vvt engine for itbs and it's nice to see someone else go in-depth. Just remember to calculate head gasket volume as your using a thicker gasket. As you might need to skim the head more then 40thou to get the same gain in compression due to the thicker gasket.

[@elwindewitte]

Oooh sweet! How has the build been? Still heavily considering going with a turbo or n/a with itb somewhere down the line.

[@Nasonix2]

I wonder if ARP Head bolts have higher torque values too than factory. It might crunch the head gasket a hair further than stock maybe . Maybe not. Is there a way to measure the head gasket size when it's fully torqued down? My thinking is maybe the gasket manufacturer advertised the thickness at stock head stud capacity. Either way it would probably be a hair at best. Oh and did anyone catch why Greg's engine is an interference engine now? Was it because of VVT? I don't think I remember him using oversized valves. Maybe he did, idk

[@christianzinn7636]

WOW!!! Your math capability blows me away!!! Thank You so much for all your work you put into this video!!! Best Always,

[@Rumnhammer]

Love that "crack" bit at the end!!! Been there with that before, usually after something is all put back together though never usually when the part is just sitting there, I run just as fast though and would have lost sleep till I could confirm it was "just" a hair.

[@kennethwatchorn3821]

I love my wife, but there’s something about Greg’s automotive passion that touches me deep. You’re my people, please play me our song!

[@federicoloffredi2467]

Nice job! Loved it, Jafro takes all of us at school!! I have had problems with the squish area, I went for 0.27inch I destroyed the head making cracks all around the 2 flat faces. Taking off 1 mm I raised the b660 head c/r over 10.7. with 100octane fuel it has begun to detonate continiously. Then I reopened up. Keep on calculating and measuring that's all in those little details that makes the difference.

[@sylvaintexier8609]

Never ever watched a video as packed of crystal clear info as this one: "can your engine handle big cams or a shaved head"

[@TopherHatch]

Been watching you and Jafromobile for years now. So Pumped you tagged him and love the in depth videos. We love miata content!!

[@philjones5728]

Greg, I have already learned so much from your videos, and you start the new season with this gem! So much info, humour and top entertainment ...... just like old times - but camera shots and editing are at the next level.

[@SuperAffe97]

Finally some new content, I'm so glad you are back

[@FDB77]

Finally, I can vibe to your intro again! Welcome back Greg :)

[@jakubtrzpis2595]

the end was great, you raised this head like she was light like a feather

[@WhyIsThatMyHandle]

Omg I felt that at 28:46 lol, I'll be modifying my valvetrain sooner or later, this video might come in handy in a year or two, thank you for that

[@shifty3583]

Excellent breakdown! On my NC, I measured actual clearance with the VVT at maximum advance by modifying a spare gear to remove the locking mechanism. Then I used a combination of feeler gauges and small sockets to hold the thing at maximum advance while claying the engine. By the way the "side" clearance measurement has a name, and that is "radial clearance", and it's usually safe to be slightly tighter than the other measurement. Usually. :D

[@mattkrazit6414]

Sheds much light on why I had valve-piston contact on the BP6D I built 2 yrs ago. .060" head shave, 10mm cams, +1 OS valves, stock 10:1 bottom end except rods and bearings. Engine lasted 200 miles before #4 piston exploded. Accidentally enabled VVT w/o reducing max lift. :doh: Ended up K swapping after that. Stellar content here, Greg. 👍

[@Stranio34]

I'm really glad to see hp academy wants to sponsor you. Even better is that I know from an old video you really also stand behind what they do/teach. Good for your that you got that sponsor deal \m/

[@TheCarPassionChannel]

Their channel is an absolute wealth of motorsports information, I learn no less than 10 new things every time I watch Andrei interview the owner of some record setting drag or time attack car. Can never learn to much!

[@kinglouiesshed8995]

3 small blobs of superglue will hold the degree wheel for purpose but will also break off quite easy once finished 👍🏼

[@TheCarPassionChannel]

Now that's my kind of ingenuity

[@kinglouiesshed8995]

@@TheCarPassionChannel Little things can make a big difference 😂

[@UnsponsoredBuilds]

So glad to see a new video from you bro! Your videos have been a big help for my nb2 cold side supercharger build! 2 months of hard work later and I am off to the dyno next week!

[@Manuqtix.Manuqtix]

I really don’t know why I haven’t subscribed to your channel. This information is really really useful.

[@madmiata1887]

Awesome video! Can't wait to see what you do. Fab9 uses Delta Cams for cold weld/grind. My 264/264 are holding up great after 2 seasons of track/street abuse.

[@Simpyspec]

the vise 😂 I was no expecting that there... it really is like that sometimes working by myself just using random things to hold stuff up

[@TheRobphobos]

Great video, and info. I did my VQ35DE C8 cams/high comp following Jafro and HP Academy and this vid would have been really useful too! 👍🍻

[@colinleder5683]

Exactly the video I needed, planning my N/A build ✨

[@caulkhead5561]

1.5mm is a fair chunk lots of great info in here thanks!

[@muaddib2678]

Your ability to present complex custom modifications that are not only understandably but also very entertaining is total awesome... completely agree with Daniel O Please! keep them coming Miata Dad we love ya! Miata owner for life :)

[@braydoncoate9583]

jafro is THE most underrated youtuber PERIOD. i love seeing him get shoutouts

[@jannevot8515]

YESSSSS I don't give a shit if I'm working tomorrow, I gotta watch this entirely !

[@TheAdatto]

I once set vvt advance to 60o for all rpm for the fun. It ran like a v8 at idle.

[@TheCarPassionChannel]

I have a whole video about that, titled the Ghost Cam Tune 😅

[@TheCarPassionChannel]

I have a whole video about that, titled the Ghost Cam Tune 😅

[@nickchilds3104]

Amazing video. I haven't owned a Miata in almost 9 months but I'm still here learning.

[@robd4163]

One of your best videos so far. Love the discussion on the head work and what you can get away with. Curious to see if you ever go oversize valves or if a 3 or 5 angle job would give you a HP lift on the new build. Keep killing it. Definitely buying you some E85! Cheers from Canada.

[@Belgarion115]

Dude, this video is DYNAMITE. Please, continue.

[@jimmy2002ful]

Yes HPA has some cool stuff, love your vids mate, 🔥

[@blackinblue11]

Man all that measuring..no wonder he was away for months:) Very nice, you can never be too sure, no skipping when squeezing more horsepower

[@BigIsleJ]

Glad you’re back!

[@nicholasfabulous]

Jafro and car passion can’t ask for much better

[@chadl.981]

Dude this is the most informative video you have ever put out. Well done sir!

[@danielpayne3708]

Maybe check valve to valve clearance as well. My +1 intake and +2 exhaust hit each other if the timing belt breaks. A head shave won't impact v-v clearance, but if you're going to bigger valves it becomes important

[@TheCarPassionChannel]

Right - and v-v clearance changes with larger cams too. There's only so much room to work with in that little chamber!

[@cameronyoung2004]

Congratulations. This is quite professional. Good job. Keep going. I like what you did with this episode.

[@LocoRocoNL]

Good to have you back man, super indepth video, love the passion you have!

[@GapMiata]

Yesss good seeing some vids back again!

[@dav6913]

Video required about squish factor and flame front propergation due to compression changes with head gasket thickness and head skim. And the effects it causes ie burned vales and premature head gasket failer

[@oomii97]

I'm always so hyped when kreg posts a new video

[@ginomu]

Yeaaah Jafro is such a meticulous guy on this subject!

[@Cintas1989]

Amazing explanation while keeping it understandable! Fine job sir! Big chop Miata math!

[@na6runner754]

Great video Greg meanwhile I’m over here with a na1.8 block with vvt rods and pistons and 40 thousands off a bp4w head I’m probably super interference as well

[@anthonywendt5834]

A lot of great info in your vid man. thanks

[@stuartrochon9999]

Glad to see you back, hope you got some rest, we missed you!

[@skatedeath2186]

You should do a video about a stock intake with stock tb Dyno run. VS a ported intake and ported TB run. And see what the gains would be. 🤔

[@travdripdrip382]

I knew it was bout to get real when he busted out wit a bench vice clamped to an intake stud.

[@Asomesauc]

Great video really enjoyed the extreme detail involved

[@curlyoakley]

Thanks man for another sick video !

[@k0b128]

Where have you been man?! I need you so I can motivate myself to get my 91' off the stands lol Also, 0:54 had me dying, one of my favorite creators parodying another of my favorites.

[@fifielcoolio]

Would be great if you did a vid explaining all the steps you went through when installing the BP 1.8 vvt into the NA. I have a 92 1.6 and looking to do this swap. Thanks for all your amazing vids!

[@TheCarPassionChannel]

I have a decent amount of coverage on this in my rebirth series, also if you Google "90-97 VVT swap" you'll get a thread from Miataturbo that covers everything in detail

[@trevorwray]

Needed this vid! Thank you

[@flipflop7577]

Hey Greg, a lot of ppl here in Germany say that Miata engines start drinking oil after the head was lifted, because the cylinders are not round anymore. The block starts to deform a little wich is causing a bigger pistonring to cylinderwall gap wich results an oil consumption increase...? Have you ever heared 'baut that? Or experienced that sort of prob?

[@lander917]

Thanks for the leg work. Love this

[@constant333]

Damn , most info i have ever found on thiss , thank you!

[@constant333]

The ending lmao!

[@wesulius]

In the case of a hydraulic lifter, keep in mind also the lifters depression when there is no oil pressure. It is up to 3mm.

[@TheCarPassionChannel]

Yep, see 4:48 🙂

[@wesulius]

@@TheCarPassionChannel Jep

[@olilarsen-wright5404]

Amazing info! Thank you!

[@northernalteration8576]

We need more videos! Have you thought about doing a Supercharger build?

[@GotMilkRS13]

Great video as always Greg!

[@dannymx9486]

The vsauce opening.... So good

[@anthonygonzales6379]

great video ! really wish it was out before my machine shop took too much off my block , and i didnt do any deck height check , ran the wrong sized head gasket and my pistons smacked the head :/ but great video !!!

[@FierceMotorworks]

Fascinating information. Very in depth explanation as always. The MSpaint visuals helped a lot too. Seems like a ton of work just to make sure your valves don't hit the piston though

[@TheCarPassionChannel]

The alternative - is guessing how much I can shave the head, and just letting the valves hit the pistons, and needing to build a whole new motor 🙂 now that would be a lot of work!

[@FierceMotorworks]

@@TheCarPassionChannel Wouldn't it only hit if the timing belt broke and the valves came down at the wrong time?

[@TheCarPassionChannel]

@@FierceMotorworks If I shave the head too much or install cams that have too much lift, the valves could contact as soon as I turn the key for the first time, immediately bending everything in the head.

[@FierceMotorworks]

@@TheCarPassionChannel Do you have to shave the head and increase compression to get more power? Why not leave it the stock height and add power a different way?

[@TheCarPassionChannel]

@@FierceMotorworks Yeah just trying to squeeze out a little bit more. I'm pretty much out of options in other areas unless I want to compromise something. I'm on E85, and the turbo is maxed out. I needed to remove the head anyways, so I figured why not!

[@akautomotive2063]

Shaving material off the head does not compensate for the thicker gasket. Yes the compresion ratio will be restored but the quench/squish whatever you want to call it is changed. The distance form the piston to the head at TDC is increased. The material must be taken from the deck surface. Not the head.

[@jp2246]

Terrific content, and yes jafro has done some great videos

[@castaway__7235]

Wish this dude was my automotive teacher damn.

[@briceburbank]

So glad your back

[@blattwald7650]

Dude, you're awesome!

[@adriangriffiths5801]

Hey Greg, why dont you get a depth micrometer to measure piston to deck height, much easier than a straight edge and feeler gauges.

[@ianfairbanks1318]

who's Greg Peters? lol nice to see you again Greg.

[@Dsalazar917K]

Great info! Haha love the Vsauce intro hahaha

[@Asomesauc]

The ending was great 👍🏻

[@lilmike2710]

Kid you just talked me right out of having my head shaved

[@Zesserie]

Does 9.0:1 to 10.0:1 compression work well with octane rating in mind? That extra amount of compression requires quite a bit more octane to prevent it from knocking. that is if you run on regular pump gas and the same amount of fuel as before. A friend of mine warped his head in a water pump failure and shaved it about 1.5mm(volvo b230f eninge, it was warped pretty bad) It needed a bit more fuel pressure since the narrow band started to complain about it goin lean sometimes

[@str8slayn1]

Watching this while wearing my carpassion shirt 😎

[@miatafan]

Great video, more Miata people need to watch Jafro. Speaking of things that would need to be remeasured, wouldn't your valve seats need machining if you had damaged valves? Seems annoying to have it be an interference engine now, Would a different manufactures pistons solve the "issue"? and have measurements for Squish been considered with changing the dimensions on nearly every part associated with it?

[@TheCarPassionChannel]

The valves are softer than the seats, they appear to be okay. Next Monday's video will verify that. It doesn't matter to me that it's interference, plenty of OEM engines are interference, just don't slack on timing belt intervals!

[@RandomGuyWithaMazda]

20 minutes in checkin, I am not entertained but I am high asf and literally have nothing better to do with my life. Take the wheel miata daddy~

[@hittman8592]

Woohoo! "Winter" season has begun!

[@MikeGonzalez4610]

My boy Egg Beaters at it again

[@chipbaish4012]

Great Video!!

[@Friendsofdonr]

Did you ever find/map out your Intake and exhaust Open and close degrees? Additionally I miss Lumberjack Creigh! Is that where they came up with Tree from?

[@Miatayo]

The Miata dad is BACK 🥳

[@migueljimenez3274]

Miata dad 😎 Epicness.

[@bizkify]

Yeeeeees can't wait to watch this after work! He bacc bois wooo

[@aaronmelchiorre4768]

Great content love it

[@mansonitefirefox]

Doesn't your "where is the engine an interference engine" based on pistons that don't have a valve relief?

[@Itsjustnater]

Dad! Glad you're back. How was MatG?

[@ghostpunkkilla]

This used to be known as blueprinting iirc.

[@chipbaish4012]

Great Video

[@brandonsever2576]

Doing this very soon on a 6.0 LS, but hopefully I'll learn something here lol Edit: I learned that I'm extremely thankful to not have a VVT cam because of this

[@brethrenmathias]

Jafro ftw 💕

[@11dmills]

Dumb question but couldn't shaving the head on a boosted engine create deck thickness issues and cause you to deform the head and lose the head gasket? I'm not super into Miata stuff so I don't know what the factory head deck thickness is but in the foxbody community guys go with cheap ebay heads on their boosted engines all the time and go through head gaskets like candy because of thin deck surfaces.

[@Bocvn68]

Ha. Get your Reps in Gregg. 😂

[@mm8436]

My man is back!

[@dragonbrownies517]

Hey Miata Dad! Hope you're doing well, love your videos dude!