Why no boosted strokers?
12-30-2019, 10:13 PM
#1
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Why no boosted strokers? I don't recall reading a single thread on here about a stroker engine getting boost of any kind. Is there a reason for this?
Building an engine for boost normally requires forged internals. Why not make it a stroker, since the parts cost the same either way? If there's no down side to having a boosted stroker, then why aren't there any boosted/stroked 5.3s? That would be the cheapest engine to build, which is probably why there are tons of boosted 5.3s out there. I just haven't seen any stroked 5.3s. I'm just wondering why that's not a popular choice.
Building an engine for boost normally requires forged internals. Why not make it a stroker, since the parts cost the same either way? If there's no down side to having a boosted stroker, then why aren't there any boosted/stroked 5.3s? That would be the cheapest engine to build, which is probably why there are tons of boosted 5.3s out there. I just haven't seen any stroked 5.3s. I'm just wondering why that's not a popular choice.
12-30-2019, 10:50 PM
#2
There are a lot of boosted strokers
Ever heard of a 408? That's been boosted so many times how can you not find one in a search.
The new trend is smaller crank and spinning them higher. So the piston does not come out of the bore and is more stabilized.
Ever heard of a 408? That's been boosted so many times how can you not find one in a search.
The new trend is smaller crank and spinning them higher. So the piston does not come out of the bore and is more stabilized.
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G Atsma (12-30-2019)
12-31-2019, 10:07 AM
#3
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Nope, I've never seen one boosted. I have heard of the 402/408/409s. I just haven't seen one boosted.
Would there be anything wrong with stroking a 5.3, and then boosting it?
Would there be anything wrong with stroking a 5.3, and then boosting it?
12-31-2019, 10:08 AM
#4
The importance of cubic inches is greatly reduced with boost. You'll make the same amount of power with a stock stroke or 4" stroke most likely.
12-31-2019, 10:13 AM
#5
X air makes Y power. When you force the air in, the actual CI of the engine isnt much relevant. Smaller CI lets you run smaller bores, shorter strokes, which increases relative piston/rod combo strength due to pin placement and compression height, as well as thicker potential cyl walls.
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01CamaroSSTx (12-31-2019)
12-31-2019, 11:08 AM
#6
On The Tree
https://ls1tech.com/forums/forced-in...estimates.html
...and this one in the Dyno Results section...
https://ls1tech.com/forums/dynamomet...8-results.html
12-31-2019, 11:14 AM
#7
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That's interesting. I figured with the extra torque that the stroker makes, it would just make that much more hp on boost.
I read a thread on here about the extra energy that a stroker exerts on the rods, pistons, and pins. The piston has to move faster, so there is more inertia generated. I understand why that puts more strain on the components. I just wasn't sure if that's why strokers don't get boosted often.
I'd like to see a before/after dyno chart of a stroker that got boosted. That's where the question of "is it worth it" gets answered.
I read a thread on here about the extra energy that a stroker exerts on the rods, pistons, and pins. The piston has to move faster, so there is more inertia generated. I understand why that puts more strain on the components. I just wasn't sure if that's why strokers don't get boosted often.
I'd like to see a before/after dyno chart of a stroker that got boosted. That's where the question of "is it worth it" gets answered.
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12-31-2019, 11:15 AM
#8
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12-31-2019, 11:34 AM
#9
Increase the boost pressure to achieve your goals. Using stroke is more expensive and increases wear.
12-31-2019, 11:35 AM
#10
That's interesting. I figured with the extra torque that the stroker makes, it would just make that much more hp on boost.
I read a thread on here about the extra energy that a stroker exerts on the rods, pistons, and pins. The piston has to move faster, so there is more inertia generated. I understand why that puts more strain on the components. I just wasn't sure if that's why strokers don't get boosted often.
I'd like to see a before/after dyno chart of a stroker that got boosted. That's where the question of "is it worth it" gets answered.
I read a thread on here about the extra energy that a stroker exerts on the rods, pistons, and pins. The piston has to move faster, so there is more inertia generated. I understand why that puts more strain on the components. I just wasn't sure if that's why strokers don't get boosted often.
I'd like to see a before/after dyno chart of a stroker that got boosted. That's where the question of "is it worth it" gets answered.
The 6.0L blocks seem to have problems with cracking between the cylinders after about 1000whp. Not all do as some people have good luck above that power level and some don't. The 5.3L blocks don't seem to have as many problems since the bores are smaller and therefore, have more cylinder wall thickness. If you don't plan to go above 1000whp, it might be more cost effective to use a stock stroke 6.0L block rather than a forged 5.3L stroker.
12-31-2019, 11:48 AM
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Originally Posted by Utinator
That's interesting. I figured with the extra torque that the stroker makes, it would just make that much more hp on boost.
I read a thread on here about the extra energy that a stroker exerts on the rods, pistons, and pins. The piston has to move faster, so there is more inertia generated. I understand why that puts more strain on the components. I just wasn't sure if that's why strokers don't get boosted often.
I'd like to see a before/after dyno chart of a stroker that got boosted. That's where the question of "is it worth it" gets answered.
I read a thread on here about the extra energy that a stroker exerts on the rods, pistons, and pins. The piston has to move faster, so there is more inertia generated. I understand why that puts more strain on the components. I just wasn't sure if that's why strokers don't get boosted often.
I'd like to see a before/after dyno chart of a stroker that got boosted. That's where the question of "is it worth it" gets answered.
12-31-2019, 12:18 PM
#14
It is relevant for the fuel system. The more fuel pressure you need to overcome boost pressure, the less the pump flows, and the harder the electrical system has to work. It may not matter to some, but it is worth considering at least.
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G Atsma (12-31-2019)
12-31-2019, 12:26 PM
#15
There are no available fuel pumps that will lose a large enough % flow with 6 extra PSI of fuel pressure to cause these issues.
An aftermarket regulator would allow you to lower your base pressure enough compared to the stroker that you end up with the same net fuel pressure with increased boost.
It isn't really worth considering.
12-31-2019, 12:52 PM
#16
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Used to see them here and there in GMHTP magazine. Too bad that magazine isnt around around anymore.
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G Atsma (12-31-2019)
12-31-2019, 01:31 PM
#17
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434 with an F1 running 16# of boost makes right at 800 to the wheels. The only issue I had early on was pushing the head, went with 1/2" ARP studs and the problem has gone away
12-31-2019, 01:35 PM
#18
Its a shame to see so many of them gone now, with a few more having just recently died off.
Source Interlink Media was always pretty good to me.
12-31-2019, 02:15 PM
#19
TECH Veteran
Right out of highschool, I worked at the factory that printed those (along with about 50 other car magazines) before moving into the magazine industry itself.
Its a shame to see so many of them gone now, with a few more having just recently died off.
Source Interlink Media was always pretty good to me.
Its a shame to see so many of them gone now, with a few more having just recently died off.
Source Interlink Media was always pretty good to me.
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G Atsma (12-31-2019)
01-01-2020, 10:42 PM
#20
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Yeah, I don't plan on going anywhere near 1000whp. My 4L80 is good for 750 whp, so I don't want to go past that. I figured I would need about 550-600 whp to run 10's in the 1/4 mile. I'd be happy with that. I'm not sure if I could do that with a NA stroker or not. An NA stroker would be cheaper than a Pro Charger kit, but the Pro Charger would give me more room to grow if needed. I want to keep my car daily drive-able for now, so I don't want any extreme build.