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Forum: Duramax Engine Building 01-24-2018, 03:05 AM
Replies: 61
Views: 3,462
Posted By Fingers
Siamese bores are just bores that share the metal...

Siamese bores are just bores that share the metal between the cylinders. That is, there is no water jacket where they meet. They are found in most modern engines these days.

It compacts the motor...
Forum: Duramax Engine Building 01-22-2018, 04:38 PM
Replies: 61
Views: 3,462
Posted By Fingers
Sounds like soon to be issues with the Siamese...

Sounds like soon to be issues with the Siamese area between the bores at the big end of that range.
Forum: Duramax Engine Building 01-21-2018, 04:46 PM
Replies: 61
Views: 3,462
Posted By Fingers
One thing I have always liked about GM is that...

One thing I have always liked about GM is that they tend to leave old bosses and mounting points in tact on new versions of their engine blocks. The bosses may not be tapped in some cases, but they...
Forum: Duramax Engine Building 01-21-2018, 10:56 AM
Replies: 61
Views: 3,462
Posted By Fingers
My wish list: Higher deck Internal...

My wish list:

Higher deck
Internal clearance for stroker++ cranks and longer rods
Sleeves from the get go.
Hermaphrodite mounting holes so parts from most years will bolt up.

But that's...
Forum: Duramax Engine Building 01-17-2018, 04:44 PM
Replies: 12
Views: 405
Posted By Fingers
You can leave one of the slave regulators...

You can leave one of the slave regulators unplugged with no issue.
Forum: Duramax Tuning, Logging, and Gauges 01-10-2018, 09:24 AM
Replies: 61
Views: 1,905
Posted By Fingers
DSP is a great way to test N tune. Load your base...

DSP is a great way to test N tune. Load your base tune for that session on 1 and load 4 candidates with minor changes of that base tune in the other 4. Now go play and log.

Something I did to help...
Forum: LBZ 01-09-2018, 05:01 PM
Replies: 32
Views: 1,144
Posted By Fingers
It is possible that you have a crack in the head....

It is possible that you have a crack in the head. The ones that only open up when things get hot are rare. I have a flaw in mine that only opens up when it is bitter cold. Coolant level goes down...
Forum: LBZ 01-09-2018, 03:06 PM
Replies: 32
Views: 1,144
Posted By Fingers
What was your piston protrusion? Not that that is...

What was your piston protrusion? Not that that is the issue.

What bothers me about your description is that once a head gasket pops, it stays popped, even at lower power.
Forum: Duramax Engine Building 12-26-2017, 05:17 PM
Replies: 38
Views: 3,442
Posted By Fingers
There is just an amazing amount of difference...

There is just an amazing amount of difference between popping a couple good numbers on the Dyno and laying it down frequently on the street or strip.

But, everyone to their own. Your money, your...
Forum: Fingers 412-638-9026 12-19-2017, 07:59 PM
Replies: 95
Views: 18,867
Posted By Fingers
I don't know that anyone has done back to back...

I don't know that anyone has done back to back for any aftermarket piston design.
Forum: Fingers 412-638-9026 12-19-2017, 07:25 PM
Replies: 95
Views: 18,867
Posted By Fingers
Take a strong piston and make it, well, stronger.

Take a strong piston and make it, well, stronger.
Forum: Fingers 412-638-9026 12-18-2017, 08:49 PM
Replies: 95
Views: 18,867
Posted By Fingers
Very nice.

Very nice.
Forum: Fingers 412-638-9026 11-25-2017, 01:00 PM
Replies: 12
Views: 960
Posted By Fingers
Video

https://youtu.be/o1lloyhPJFI

https://youtu.be/tq5Le6laeyQ
Forum: Fingers 412-638-9026 11-25-2017, 12:45 PM
Replies: 12
Views: 960
Posted By Fingers
Pin clearances are good. Hard pack indications...

Pin clearances are good. Hard pack indications are only on the top of the pin bore from the obviously significant chamber pressures. Pattern is even. Bottom half of pin bore shows normal/minor wear....
Forum: Fingers 412-638-9026 11-24-2017, 09:19 PM
Replies: 12
Views: 960
Posted By Fingers
There could be several causes of the oil not...

There could be several causes of the oil not cooling the pistons. Considering it was a drag truck, it could have starved the pickup at launch or even overloaded the top end with oil. Internal wind in...
Forum: Fingers 412-638-9026 11-24-2017, 08:29 PM
Replies: 12
Views: 960
Posted By Fingers
Cracked Piston

Well, it finally happened. Although it was preventable. Two Cast Oval Bowls cracked in a full on race build running well over 1000 HP. The cracks are on the outside of the piston and run from the pin...
Forum: Limitless Diesel Performance LLC- Evan Drosehn 413-770-3585 10-27-2017, 06:33 PM
Replies: 47
Views: 2,350
Posted By Fingers
Just think how many chips gave up there existence...

Just think how many chips gave up there existence for that pan to come to life!
Forum: LMM 10-23-2017, 07:13 PM
Replies: 1,021
Views: 68,112
Posted By Fingers
Some of the cover plate bolts get close, if not...

Some of the cover plate bolts get close, if not into the water jacket on the block. Did any of the bolts have coolant residue on their threads?
Forum: LMM 10-23-2017, 06:10 AM
Replies: 1,021
Views: 68,112
Posted By Fingers
Looks like it leaked between the cross over to...

Looks like it leaked between the cross over to the bolt holes then out from under the heads of the bolts.
Forum: Duramax Engine Building 10-13-2017, 07:42 PM
Replies: 22
Views: 1,093
Posted By Fingers
Very hard to tell from the injector marks. They...

Very hard to tell from the injector marks. They are made as the piston is already on the way down.

Dude, that piston pitting at the top is usually an indication of water in the cylinder. (steam...
Forum: Duramax Engine Building 10-13-2017, 03:44 PM
Replies: 22
Views: 1,093
Posted By Fingers
Maybe some, but it is mostly because the pistons...

Maybe some, but it is mostly because the pistons run much cooler than stock. Keep in mind the available quench area on a piston with valve reliefs is very small..

The exposed area on the top of...
Forum: Duramax Engine Building 10-13-2017, 06:17 AM
Replies: 22
Views: 1,093
Posted By Fingers
Very small distances between the metal surfaces...

Very small distances between the metal surfaces in the chamber cause "quench". That is, they snuff out the combustion in that area by drawing off the heat in the air/fuel charge below the combustion...
Forum: Duramax Engine Building 09-15-2017, 05:06 PM
Replies: 56
Views: 3,032
Posted By Fingers
Longevity of the pistons would not have been an...

Longevity of the pistons would not have been an issue with the Ovals, though the blow by can get high with the higher compression. (18:1 and higher) I sell the gapless second rings now to keep that...
Forum: Duramax Engine Building 09-14-2017, 05:14 PM
Replies: 56
Views: 3,032
Posted By Fingers
Who Quoted you those Prices for my pistons? Way...

Who Quoted you those Prices for my pistons? Way out of line.

Jon
Forum: Duramax Engine Building 07-19-2017, 08:24 PM
Replies: 58
Views: 4,018
Posted By Fingers
Once the piston cracks into the oil gallery, the...

Once the piston cracks into the oil gallery, the engine oil itself burns like a super hot torch destroying the piston more. Small cracks turn into big holes fast.
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