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> Mystery engine is out
Tdskip
post Mar 31 2020, 06:17 AM
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@Rand - yep, your superior intellect nailed it. I'm a Luddite, if that is even how you spell it...

Thanks for making the forum a better place.
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Tdskip
post Mar 31 2020, 08:13 PM
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Anyone know of these dots in the cylinder head, which look drilled, are normall? Purpose? Don’t think these are standard...

Hope everyone had a good day.

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Tbrown4x4
post Apr 1 2020, 04:42 AM
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Don't know about the ding in the valve face, but the dimples in the chamber wall are to affect the flow characteristics of the intake charge. Not sure how effective they are in a combustion chamber. I would be worried about carbon buildup in the dimples causing pre-ignition.

BTW, I can't tell if that picture is upside down or not. (IMG:style_emoticons/default/confused24.gif)
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Tdskip
post Apr 1 2020, 07:14 AM
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Good morning, thanks for the response @tbrown4x4

These are laying on the garage floors so sorry that rotation of the picture was 180 off.

Thanks for the info on the dimples, looks like custom work then by prior owner.

Valves look bigger than expected so I measured and intake is 50mm, exhaust is 40mm so significant bigger than stock.

That was just debris on the valve in that picture above ( it’s all going to get taken apart so I haven’t been super worried about cleanliness on the heads), but look at the nicks on the surrounding area.

Think that was foreign matter or something else?

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JOEPROPER
post Apr 1 2020, 07:38 AM
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Looks like something was inside there trying to get out.
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Tdskip
post Apr 1 2020, 07:43 AM
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QUOTE(JOEPROPER @ Apr 1 2020, 08:38 AM) *

Looks like something was inside there trying to get out.


Good morning, hope you are doing well.

So looks more like foreign matter rather than detonation? I'm still very new at engine internal diagnostics but I believe denotation generally looks different than this.
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Tbrown4x4
post Apr 1 2020, 08:44 AM
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Those are impacts. See how the metal is displaced around the marks?

And I was joking about the picture orientation.
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live free & drive
post Apr 1 2020, 09:37 AM
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The dots around the intake are laminar flow enhancers (golf ball dimples) you usually see these dimples machined into intake manifold runners on high end porting/flow jobs - the other ones looks like a nut went down the intake and smashed around a bit.
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Tdskip
post Apr 1 2020, 09:42 AM
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Thanks guys, sorry I missed the joke @TBrown4x4 !

So does that scrap the head or "just" require more money to repair IF I try to use these again.
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Tbrown4x4
post Apr 2 2020, 02:30 AM
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I don't see why you couldn't use them as they are. After a trip to the machine shop, of course.
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falcor75
post Apr 2 2020, 04:11 AM
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Wow those dimples are funky, I doubt they contribute anything but imaginary horsepower. And a 50 mm intake valve, especially on a turbo engine where you force the charge past the valve... Feels like the builder ticked all the most expensive options without really knowing what it would result in...
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Tdskip
post Apr 2 2020, 02:30 PM
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Thanks gentlemen, appreciate the insight.
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Tdskip
post Apr 17 2020, 11:06 AM
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Pulled the flywheel - 12.3 pounds.

Note to self - blow off the clutch dust before bringing it inside next time.
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UROpartsman
post Apr 17 2020, 12:02 PM
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Great stuff, thanks for sharing.
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Tdskip
post Apr 17 2020, 12:05 PM
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QUOTE(UROpartsman @ Apr 17 2020, 01:02 PM) *

Great stuff, thanks for sharing.


Yes - I thought the tip to avoid getting brake dust on your bathroom scale was super useful. Ha, I am such a dope. Vacuum, don’t try to wipe it up btw.

:-)

Hope you are doing well.
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sixnotfour
post Apr 17 2020, 12:08 PM
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picture of backside for reference pls. (IMG:style_emoticons/default/beerchug.gif)
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Tdskip
post Apr 17 2020, 02:27 PM
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Here you go

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Tdskip
post Aug 17 2020, 05:42 PM
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Hello gentlemen - just an update that after lots and lots of cleaning this engine went to Brothers for a rebuild this morning.

Going to run it around 8.5:1 compression so pump gas is OK and not too highly strung. Case being split and everything checking and replaced/addressed as needed.

Appreciate all the engagement on this thread and others (like flywheel questions).

Will be going back in the red car it came out of so will be using Ben’s /6 bits on a different build.

Will keep this thread updated with how it all turns out, going to be a couple weeks.
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PaulFV8
post Aug 20 2020, 05:25 AM
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QUOTE(Tdskip @ Aug 17 2020, 07:42 PM) *

Hello gentlemen - just an update that after lots and lots of cleaning this engine went to Brothers for a rebuild this morning.

Going to run it around 8.5:1 compression so pump gas is OK and not too highly strung. Case being split and everything checking and replaced/addressed as needed.

Appreciate all the engagement on this thread and others (like flywheel questions).

Will be going back in the red car it came out of so will be using Ben’s /6 bits on a toe jt build.

Will keep this thread updated with how it all turns out, going to be a couple weeks.


TD, apologies if I missed a post. Did you determine who built these parts? Pauter?
Thanks
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Tdskip
post Aug 20 2020, 08:08 AM
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Hi Bao-I have not been able to figure that out but a couple of the shops I talked to said the welding that I thought looked sketchy was actually very deliberate to allow the heads to handle more heat and the builder when we went over everything gave it a “Yep, this will work” initial review subject to splitting the case in doing the detailed checking/machine work.

Apparently there have been quite a few of these big motors built in greater Southern California over the years and while they have somewhat fallen out of favor they’re pretty known territory.

Happy to share whatever I learn and will let people know how this goes.
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