1930's Rolls-Royce Cylinder Head Resurfacing

[chuckwin100]

I was wondering if it was an option to try and straighten the head with heat as you have done in the past.

[Kurisuchianu89]

Thanks for the great videos john! I have a question though. What is this Ra you are measuring? Is it basicly a measurement of the surface finish? Thanks in advance!

[Kurisuchianu89]

@Kurisuchianu89 And forgot to add this: How is it measured? And how much is one Ra in a common metric unit?

[krollalfa2]

i wish i could work for you

[KEEPINITRIL]

Would an aged engine like this hold up ok to an increased compression of the original 4:1 to say, 7 or 8:1?

and I think I have an insert you should try, rcmw 12 04,

when we go to Westec we gotta bug Sandvik and Kennametal and Walter

[1974Alfa5Spd]

Holy crap how big is that engine? Six liters?

[1hdsquad]

Great video, John :) I've got two quick questions:

a) Wasn't the head hanging through by it's own weight and the force of the resurfacer? I would have wanted to support it in the middle, seems like it is not necessary?

b) I wonder how exactly the measurement tool works, could you tell me how you call this peace of equipment so I can google its inner workings?

Thanks in advance :)

[fiatnutz]

@1hdsquad - a) This head was over 6" thick and is a very complex casting and does not require support. The welding of the corrosion damage is to blame for the excessive warpage. b) As stated, the gage measures five sections .030" long. See the Mitutoyo website for additional information. There are about 10 parameters that can be measured, the SJ-210 can measure Ra and Rz.

[compucar03]

@1hdsquad If the head was deflecting he would get a surface finish of 1000+. Certainly not 18.1 which is damn good. John you should bill that customer for a new PCD insert since his tungsten dribbles probably chipped it! The tool to measure the RMS surface finish is called a profilometer.

[P8NTBALL60]

V12 or 6cyl inline?

[fiatnutz]

@P8NTBALL60 - Inline six.

[73Shakes]

That surface was all caddywhompused

[volodymyrm1]

@fiatnutz hey John isn't this one an airplane engine cylinder head?

[fiatnutz]

@volodymyrm1 - No, it's a car engine.

[volodymyrm1]

@fiatnutz ok thats pretty cool i do have a question i was MIG welding a turbo oil downpipe fitting on my oil pan which is cast aluminum 2.2 ecotec '07 cobalt and you guessed it, it warped should i just resurface it on stationary table top sander? or go to a shop?

[citydriver]

5:1??!! hand cranked or what?

[jts895]

How does this resurface job fall on a scale of your best/worst improvements? 113.3 down to 18.1 sounds like a pretty damn good improvement. Have you had any heads (or blocks for that matter) come in worse than 113?

Good job with the videos. I enjoy watching them. I get excited when i see a new one is posted, regardless of what work is being done.

[fiatnutz]

@jts895 - Yes, over 250 Ra. They might as well drug the block across the cement.

[joehunt1980]

@jts895 Its not really surprising it had a rough surface to start with.

Automotive machinists used to purposely leave the surface finish a little rough when using composite Copper/fibre head gaskets. Apparently it gave the gasket more "bite" onto the mating surfaces and made for a longer lasting seal.

[86Ivar]

When the cyl head has warped that much and you dont straighten it out, will you have to straighten out the camshaft bearings by line boring/honing?

[fiatnutz]

@86Ivar - The cam is in the block on this engine.

[timgowd]

How much do you think you raised compression and will it affect how the engine runs?

[fiatnutz]

@timgowd - raised the compression by about .3 points, not enough do worry about with 4.5:1 to 5:1 compression ratio.

[mikldude]

i would have expected to see the head made of cast iron, i always thought the use of alloys in heads was a modern thing.

[macspud28]

@mikldude The British manufacturers were having success with alloys way before the US in fact US manufacturers had a lot of help from the Brits in this field. Different technologies were were swopped back and forth between the two countries over the years. Lots of competition but also sharing.

[macspud28]

@macspud28 I remember a story of my fathers from the sixties where an American company sent a sample drill bit over here with lots of fan fare about how it was the smallest bit ever made. It was duly sent back. A few weeks later there was a letter saying come on where's the credit for our amazing feat, at the a reply was sent back "look closer at your drill bit" what they'd been done was drill through the centre of the bit and sent it back without a note.

[macspud28]

@macspud28 Later they got a reply "well done you got us this time" with this kind of competition a lot of breakthroughs were made.

[mikldude]

@macspud28 ok , cheers mate.

[Chevypower265]

Before you said what the compression ratio was I was just thinking, that with such HUGE combustion chambers it must be a very low compression Engine.

[Morkvonork]

Was it hanging through by its own weight?

[MyanmesKenny19]

Is that pretty much a gantry mill with a flycutter?

[fiatnutz]

@MyanmesKenny19 - Sort of, but a true gantry mill would have supports on both sides of the cutter. This is a specialty mill designed to do this job.

[macspud28]

It would be nice to see you setting the head up to be surfaced, be good to see how you get it leveled out prior to milling.

[hondannyboy]

I wish there was a machine shop with this kind of labor quality in my country.

Awesome work!

[reverendbigred]

GOOD VID!!!

[VMATT500C]

Nice job. What's with the oval combustion chamber? Interesting.

[fiatnutz]

@VMATT500C - This is a twin-plug head and you want to keep as much of the combustion gasses as close to the flame front as possible. Kinda cool, this design.

[VMATT500C]

@fiatnutz, sort of an early squish head.

[pantherxx010]

@fiatnutz wow never seen this kind of those combustion cambers.

[aj9270]

beautiful work ! love the videos !