Most robust engine build? - Page 2

laynlo15 · 12-26-2019, 10:50 AM

These stock block cylinders are always out of round when you take them apart. I've talked to several others that have pulled theirs apart and found out the cylinders are not round including 6genmikes. I don't know if the NA guys are seeing the same or not, maybe its an FI issue with the higher boost levels some of us run.

Goohead · 12-26-2019, 06:08 PM

Idk, if I am sleeving and I thought about it, why not go 4” while I’m at it? The sleeves are already longer giving better stability of the pistons in the hole, (~5.8” If I remember correctly). Rod angle/pistons speed vs higher rpm for Longevity/wear seems like a wash to me...

On that note anyone seems or heard anything about these power bore sleeves? Seems cheaper than darton

parish8 · 12-26-2019, 07:52 PM

Quote:

Originally Posted by Goohead

Idk, if I am sleeving and I thought about it, why not go 4” while I’m at it? The sleeves are already longer giving better stability of the pistons in the hole, (~5.8” If I remember correctly). Rod angle/pistons speed vs higher rpm for Longevity/wear seems like a wash to me...

On that note anyone seems or heard anything about these power bore sleeves? Seems cheaper than darton

I wish more peoples experience led them to this conclusion. I would love to go with a 427. That being said people are saying a 388 is stronger. Seems like the fastest guys spin their motors high.

7WSM · 12-26-2019, 09:08 PM

I like more meat between the cylinder walls if you are going to boost it and spin the hell out of it.

Katech_Zach · 12-27-2019, 08:34 AM

It all depends on what you are doing. The bottleneck of the LT platform is with lacking a 6-bolt based block. You're going to lift a head before you break a block.

Umbriel · 12-27-2019, 08:51 AM

I bought a forged 416 short block from Thompson Motorsports to go with my twin turbo kit and will be looking to make about 1200 rwhp with it, that should be plenty to go 8s with and that will be plenty for me.

parish8 · 12-27-2019, 09:15 AM

Quote:

Originally Posted by Katech_Zach

It all depends on what you are doing. The bottleneck of the LT platform is with lacking a 6-bolt based block. You're going to lift a head before you break a block.

What lifts heads? Peek cylinder pressure? If so what is the best way to increase hp without increasing peek cylinder pressure? More rpm? More stroke? Both?

What is your idea of an ideal lt engine?

Katech_Zach · 12-27-2019, 10:10 AM

Quote:

Originally Posted by parish8

What lifts heads? Peek cylinder pressure? If so what is the best way to increase hp without increasing peek cylinder pressure? More rpm? More stroke? Both?

What is your idea of an ideal lt engine?

Cylinder pressure is the primary reason why a head will lift. Decreasing peak torque and increasing RPM is one way to get around this.

Build your next engine to spin to 8000 or 8500.

laynlo15 · 12-27-2019, 10:17 AM

Dam 7wsm that sounded kinda dirty.

toohighpsi · 12-28-2019, 02:46 AM

Mike's sleeved block leaked water, he's running a stock block with a 416. best solution out there as far as I know now.

parish8 · 12-28-2019, 09:05 AM

Quote:

Originally Posted by toohighpsi

Mike's sleeved block leaked water, he's running a stock block with a 416. best solution out there as far as I know now.

Well crap. Is this a common problem? Who did the sleeves?

oldman · 12-28-2019, 11:15 AM

you can get corner bolts on the LT1 so this may help.

I have had sleeved Honda blocks (Darton, Golden Eagle) for decades now, In general they all weep a little watter. It is NOT uncommon to run a tad bit of radiator sealant in these engines (I do on my type R). None of us like it, it is the unspoken reality of the engine build.

I already had a valve train failure and this new big cam with moderate lift redlines at 7200 RPM... 8000 RPM would require a non-DD valvetrain, IMO of course.

12-26-2019, 10:50 AM	#15
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	These stock block cylinders are always out of round when you take them apart. I've talked to several others that have pulled theirs apart and found out the cylinders are not round including 6genmikes. I don't know if the NA guys are seeing the same or not, maybe its an FI issue with the higher boost levels some of us run. __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

12-27-2019, 10:17 AM	#23
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	Dam 7wsm that sounded kinda dirty. __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

12-28-2019, 11:15 AM	#26
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,316	you can get corner bolts on the LT1 so this may help. I have had sleeved Honda blocks (Darton, Golden Eagle) for decades now, In general they all weep a little watter. It is NOT uncommon to run a tad bit of radiator sealant in these engines (I do on my type R). None of us like it, it is the unspoken reality of the engine build. I already had a valve train failure and this new big cam with moderate lift redlines at 7200 RPM... 8000 RPM would require a non-DD valvetrain, IMO of course. __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires. Last edited by oldman; 12-28-2019 at 02:19 PM.

12-26-2019, 06:08 PM	#16
Goohead Horsepower whisperer Drives: Camaro Join Date: Jun 2017 Location: MO Posts: 185	Idk, if I am sleeving and I thought about it, why not go 4” while I’m at it? The sleeves are already longer giving better stability of the pistons in the hole, (~5.8” If I remember correctly). Rod angle/pistons speed vs higher rpm for Longevity/wear seems like a wash to me... On that note anyone seems or heard anything about these power bore sleeves? Seems cheaper than darton

12-26-2019, 09:08 PM	#18
7WSM Drives: 2017 ZL1 A10 Join Date: Nov 2009 Location: Pearland, TX Posts: 465	I like more meat between the cylinder walls if you are going to boost it and spin the hell out of it.

12-27-2019, 08:34 AM	#19
Katech_Zach Drives: 14 Camaro SS 1LE Join Date: Feb 2019 Location: Clinton Twp, MI Posts: 483	It all depends on what you are doing. The bottleneck of the LT platform is with lacking a 6-bolt based block. You're going to lift a head before you break a block.

12-27-2019, 08:51 AM	#20
Umbriel Drives: 2016 Camaro SS Join Date: Sep 2018 Location: Bartlett, TN Posts: 1,121	I bought a forged 416 short block from Thompson Motorsports to go with my twin turbo kit and will be looking to make about 1200 rwhp with it, that should be plenty to go 8s with and that will be plenty for me.

12-28-2019, 02:46 AM	#24
toohighpsi Drives: 2015 C7 Z06 M7 Join Date: Dec 2012 Location: So-Cal Posts: 654	Mike's sleeved block leaked water, he's running a stock block with a 416. best solution out there as far as I know now.

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