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FrankenFerrari - V12 ferrari 308 part 4
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Author:  TheDarkSideOfWill [ Wed Jul 21, 2021 8:50 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
That was somebody's future barn find dust!
Author:  MerlinTech [ Thu Jul 22, 2021 6:43 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
Are you painting to tighten up the fit?
If I need the piston vise I will let you know. I am good at the moment.
Author:  mk e [ Thu Jul 22, 2021 8:03 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
MerlinTech wrote:
Are you painting to tighten up the fit?
If I need the piston vise I will let you know. I am good at the moment.


Way back about the time I was ordering the lapping bar I "final installed" the liners in the block so I could torque the heads to set up the bearings and just for the heck of it I put the bore gauge in...just to see. It turns out if the cylinders can move they will move. Most were within 3 so...but I think 1 was 17 iirc. i tracked the issue to the liner/block gap. I never measured the block, the shop's notes said 3.572 so I made the liners 3.571...except for the couple that were smaller and the 1 with a 5 thou taper so 3.571 at the oring but like 3.566 at the bottom that then produced 17 out of round. Checking he block, its not 3.572 eight, its 3.574+ at the bottom and most are closer to 3.576 at the oring, hence the 3 out on at the "good" liners.

I decided, in my wisdom to jbweld everything, but the 1st one I tried to clean up it pealed on when it just even close to finish size and it was past time for house work so I parked it. Picking up again now, with a different tool bit I was able to get the 3 worst liners machined round then I sanded to 3.572 and removed the jbweld from the other 9 so I had a set that should work but out 3 thou or so if installed as is.

So yeah, the paint is an attempt to add a couple thou to the spigots so they sit a bit rounder. This morning the read 3.579 so I have more than plenty at the moment. I'm leading toward seeing if I can get a hone into the spigots and straighten them out at around 3.576 and finish the liners to 0-5 tenths and install in a warm block.

I realized I have 1 one over....upstairs in the shop! I'll move these to a shelf up top to bake.

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Author:  kkrace [ Fri Jul 23, 2021 10:37 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
Anyway you can knurl the liners to get a couple thou and then turn them to the correct size
Author:  mk e [ Sat Jul 24, 2021 9:37 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
kkrace wrote:
Anyway you can knurl the liners to get a couple thou and then turn them to the correct size


Maybe....I thought about it but was pretty scared about damaging them and perhaps also damaging the block putting them in.

I put the main caps on and measured the spigot bores this morning.  They are not horrible but not ideal with the smallest reading at 3.573, the largest at 3.576, sadly both on the same spigot.  9:30am and the shop is already pretty hot so back to house work while I ponder what I want to try first to get this a bit straighter.

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Author:  Todd308TR [ Sun Jul 25, 2021 8:29 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
It's looking good still.
Author:  TheDarkSideOfWill [ Mon Jul 26, 2021 7:07 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
mk e wrote:
kkrace wrote:
Anyway you can knurl the liners to get a couple thou and then turn them to the correct size


Maybe....I thought about it but was pretty scared about damaging them and perhaps also damaging the block putting them in.

I put the main caps on and measured the spigot bores this morning.  They are not horrible but not ideal with the smallest reading at 3.573, the largest at 3.576, sadly both on the same spigot.  9:30am and the shop is already pretty hot so back to house work while I ponder what I want to try first to get this a bit straighter.


Move the block into the basement for temperature stability? That's not a joke... with the tolerances you're trying to hold, 20 degrees of temperature difference affects the measurement.
Author:  TheDarkSideOfWill [ Mon Jul 26, 2021 12:52 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
I dunno why I didn't think of this sooner... Line 2 Line does a teflon-based coating that's typically used on Piston skirts and bearings. I believe I've mentioned it on the forum before.
There's no reason it couldn't be applied to the outside of the liners...
Author:  mk e [ Mon Jul 26, 2021 1:43 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
TheDarkSideOfWill wrote:
I dunno why I didn't think of this sooner... Line 2 Line does a teflon-based coating that's typically used on Piston skirts and bearings. I believe I've mentioned it on the forum before.
There's no reason it couldn't be applied to the outside of the liners...


Its been a while but I did have line2line coat the pistons to work with my bores that came out larger than I was planning but didn't really think about that for the liner spigots. At this point the parts are all epoxy painted so I'll probably proceed while quietly thinking I should have just started over and made new liners.......

Good point on the shop temperature. There is flat no way I can move car parts back into the basement but I will keep an eye on temp and maybe get into the habit of micing the 3" standard everytime before I use the mic to know to be sure I know how things are moving around.
Author:  mk e [ Mon Aug 09, 2021 7:59 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
My hope for mornings in the shop did not materialize...3000lbs of leftover commercial 24x24x7/8 creama marble did along with some what bent 60" linear drain that had straightened and cut into the concrete, a wall mounted sink that came with very specific framing requirements, and a wall mirror that needs a dedicated 20A line...don't ask.....a few more weeks it looks like

The drain came out nice though after all the concrete dust settled

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