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One more time BUILD THREAD I must be stupid

 
Old 02-02-2019, 01:18 PM
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What's the deal on those v2 265s? I haven't seen those?

Btw, this is what the MMS 265s can do on a 468... with box stock MSD intake, some unknown 30 degree overlap Comp cam, and stock LS7 rockers. Just to emphasize more cubes = always good.

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Old 02-02-2019, 01:42 PM
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I haven't seen the data on the V2's, but i remember Tony was targeting 420 cfm. Assuming a bit of port work, likely they are similar to the BR7 273. Flows 420 on 273cc runner. i don't know if he had to open them up any to gain the extra flow or if it is just mad wizardry in the bat cave.
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Old 02-02-2019, 01:52 PM
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Guy's make to big a deal about shrouding.
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Old 02-02-2019, 01:54 PM
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Originally Posted by Smokey B View Post
Guy's make to big a deal about shrouding.
Nah, we don't. We don't make a big enough deal about it.
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Old 02-02-2019, 02:06 PM
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Originally Posted by Smokey B View Post
Guy's make to big a deal about shrouding.
...says the guy who has no clue as to what effect it has on performance.
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Old 02-02-2019, 02:11 PM
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Funny!
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Old 02-02-2019, 02:14 PM
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So what would be the typical power loss through out the rpm band since it's so major? Again Funny!
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Old 02-02-2019, 04:32 PM
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Im pretty sure im gonna go with 4.155 bore and 4.1 stroke. This allows me to still rebuild the block in the future if needed. Also this allows me to get off the shelf pistons. Im really trying to get this thing back together soon.
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Old 02-02-2019, 04:43 PM
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For my last two engine builds I have run JE asyemmetric pistons which have tiny skirts and are extremely light. These pistons come in a 4.155 4.1 stroke off the shelf.

But wiseco offers a 4.155 4.125 stroke off the shelf and i assume the wisecos weigh a little more. Pricing is pretty similar.

I wonder what is more important, 4.1 vs 4.125 stroke or the weight of the pistons.

my old je's weigh 420g in a 4.08 4.0 stroke and matching wiseco's weigh 490g

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Old 02-02-2019, 08:09 PM
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Wiseco's are heavier off the shelf. I prefer the JE design on LS7 stuff, otherwise Wiseco is better, especially with the longer stroke stuff.
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Old 02-02-2019, 09:43 PM
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Originally Posted by Darth_V8r View Post
I haven't seen the data on the V2's, but i remember Tony was targeting 420 cfm. Assuming a bit of port work, likely they are similar to the BR7 273. Flows 420 on 273cc runner. i don't know if he had to open them up any to gain the extra flow or if it is just mad wizardry in the bat cave.
Yes, yes, and a larger diameter intake valve...ti of course.
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Old 02-03-2019, 11:00 PM
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https://www.yellowbullet.com/forum/s....php?t=2560831

Good read on how to pick cylinder heads and not by the commonly used cc methods.
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Old 02-04-2019, 06:17 AM
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Id go 4.185/4.0. Keep the rod to stroke ratio decent and the slightly taller pistons will be more stable in the bores. Less ring flutter is a good thing Piston speed gets really high when spinning over 4 inch stroke stuff. At your power level I really dont think the engine cares about 50 grams of piston weight. On a restricted low power circle track engine its a big deal but not in your case
Your heads and that cam seem really good and Im betting the nosing over you speak of was a push rod and or valve spring thing more than the profile being wrong
running an air pump will be huge on an engine this size
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Old 02-04-2019, 09:01 AM
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The Dart block has much longer sleeves though. They are 5.800" or longer, I can't recall exactly. But the 4.125" stroke is supported better in that block than a 4" stroke is in a production block. I would have zero issue running the bigger stroke. It will make more power with more stroke. Even if the RPMs come down a few hundred RPMs. That's where having a better intake manifold and more cam timing gets the RPM back (and in turn more HP)... But the 4.185/4 is probably the best option for a high revving really powerful engine.
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Old 03-04-2019, 09:06 PM
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Im still trying to get everything figured out for my new engine.

I keep wondering if i should go crazy on the stroke like 4.25 and keep my rpms down? Maybe better on the oiling system

At what point does increased piston speed and extra friction come into play. I know there is no replacement for displacement but alot of these big hp motors have relatively small displacement.

But what is actually faster at the track? bigger displacement or more rpms and hp.

thoughts?
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Old 03-04-2019, 10:07 PM
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Bigger inch engines always make more power but are less efficient. Parasitic frictional losses stack up. Sixty percent of an engines rotational friction is from the rings. Long strokes drive the piston speed (feet per second) of linear travel up
smaller engines with large bores to breathe through big heads will twist high with shorter strokes and always make more horse per cube.
Heres a funny exercise. Figure the feet per second of the big ends of the rods. The heaviest part of the bob weight (two per journal) at like 8000 rpms. Do a 3.622 and compare to a 4.125. Huge difference
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Old 03-05-2019, 10:53 AM
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Another consideration in High RPM longer stroke engines, specifically shorter rod/stroke ratios. While they accelerate quicker
providing more torque in the low and mid-range, at higher RPM they contribute significantly to increasing friction
due to piston/ring side loading against the cylinder bores.

I would choose the 4.155-4.185" Bore X 4.00" Stroke for a NA build it will still make all the torque you can use
in all but the most all out strip builds and maximize Head Flow.

All depends on the combo and application.

Last edited by NAVYBLUE210; 03-05-2019 at 11:01 AM.
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Old 03-05-2019, 01:14 PM
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I know you're doing a lot of this on your own, but call Dustin Lee. He just put together an 8500 rpm 416 LS3 that made a touch over 900 horsepower. It is basically exactly what you're looking for. He used the AFR Ls3 head and a super victor.
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Old 03-05-2019, 01:41 PM
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Originally Posted by spanks13 View Post
I know you're doing a lot of this on your own, but call Dustin Lee. He just put together an 8500 rpm 416 LS3 that made a touch over 900 horsepower. It is basically exactly what you're looking for. He used the AFR Ls3 head and a super victor.
Agreed!
Dustin is a Great Engine Builder (He built my 396") and a Good Guy as well.
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Old 03-19-2019, 07:24 PM
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Unfortunately, i think im gonna have to put this build on hold. Just found out I have another kid on the way. I have decided im gonna go turbo 5.3 until i have more time and money to finish building this new engine. Good news is my headers will work for turbo manifold flipped around. I have a gtx4294 turbo that should work good on a stock 5.3



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