April 02, 2020, 10:37:44 AM

Author Topic: MID sleeved block - Do you like it?  (Read 177 times)

Offline kinger

MID sleeved block - Do you like it?
« on: March 24, 2020, 02:31:55 PM »
Wondering if anyone had a block re-sleeved with the MID wet sleeves not the dry Darton sleeves.  I'm looking a LS7 block with MID sleeves. 

https://dartonsleeves.com/pdf/LS1_manual.pdf

Thoughts on the points copied and pasted in below?

Looking at some of the detail there some points that concern me:

We highly recommend the use of 4032 alloy pistons for normally aspirated street use and 2618 alloy for racing, boosted or nitrous street
use. 4032 is a low expansion alloy best suited for street use where
one would want minimum piston to wall clearance to minimize piston
rock, noise and oil consumption. 2618 alloy has superior strength and
is the preferred alloy for racing use or street use with nitrous. But this
alloy requires significant increases in piston/wall clearance.

The Darton kit effectively converts the block to a wet sleeve configuration as
used on diesel engines. One cannot expect the original cooling system to
effectively cool and engine producing two or more times the power of the
original engine, along with a modified cylinder arrangement. We recommend “Evans NPG+™” coolant be used as well as Evans LS–1 reworked
water pump utilizing a relocated thermostat. High output applications may
also require a larger radiator and coolant fan. Evans coolant is recommended because of the potential for hot spots and cavitation around wet style
sleeves.

We require break–in and
tuning using an engine dyno or chassis dyno as follows:
∑After initial start up, warm up engine at 2000–2500, at no more than
100–150 ft. pounds of torque for 15–30 minutes. Precaution should be
exercised to prevent excessively rich or lean conditions, which will gall
the cylinders. Monitor oil pressure and temperatures.
∑After initial run, adjust valves if using adjustable valve train and re–torque
heads. Check for leaks.
∑Street engines will require multiple run–ins with increasing rpm and load
up to maximum output.

A racing engine is generally
built with sufficient clearance to require no further break–in after dyno tuning and power runs. However, we recommend head bolt torques be
re–checked cold after dyno testing as the head gaskets will take a set.
93 Touring, 6.3L, T56 Magnum, Mamo RPS BC2 clutch, FAST 90, NW 90TB TB, 8.8, samberg everything, AC, PS, TC, Cruise, LED Tails, HID head lights

Offline frijolee

Re: MID sleeved block - Do you like it?
« Reply #1 on: March 24, 2020, 03:09:39 PM »
I'm running a 429ci LS2 that was stroked by the prior owner with Darton dry sleeves.  Not exactly what you're looking at but figured it was worth noting that it's been entirely trouble free. 

About the only oddity I ran into was that oil pressure runs a bit lower than I'm used to, but that should be a function of journals and clearances not so much sleeves.  I switched to 20w50 and it's been pretty easy.
LS2 stroker FC, Mandeville big brakes, widebody, etc
Build thread:  http://www.norotors.com/index.php?topic=1274.0
www.roninspeedworks.com

LargeOrangeFont says: "Joel is right, and I love Joel. But his car sounds like the wrath of God."   ;)

Offline Exidous

Re: MID sleeved block - Do you like it?
« Reply #2 on: March 24, 2020, 04:22:54 PM »
I prefer the dry sleeve for a street strip car. The MID wet sleeve weakens the block since the entire water jacket is removed. ERL used to add webbing to get the strength back. The o-rings are a point of failure as well. Unless you are running a lot of boost or plan on serious road racing stick to a dry sleeve.

The MID are easier to replace, cool better and support more power but you're talking the 1k+ crowd. The dry sleeve is a stock block with a far stronger wall that can be opened up more.

The Powerbore sleeves I have can go as big as 4.200" but that's the limit and power adder not suggested.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline kinger

Re: MID sleeved block - Do you like it?
« Reply #3 on: March 24, 2020, 08:47:51 PM »
That’s what I was thinking as well.  Thanks


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93 Touring, 6.3L, T56 Magnum, Mamo RPS BC2 clutch, FAST 90, NW 90TB TB, 8.8, samberg everything, AC, PS, TC, Cruise, LED Tails, HID head lights