High compression & Oem stock block
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Tuskey your right as it's well known a Aluminum block will move and doesn't make as much HP as the same iron block would.
Weight penalty eats it back up or cam the aluminum block for more Rpm to make up the hp difference.
Weight penalty eats it back up or cam the aluminum block for more Rpm to make up the hp difference.
Why does an iron block make more power than an aluminum block all things being equal? I would assumed the opposite since the aluminum can transfer heat quicker.
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DD ......
its a old known thing that I've heard and read. Ask any Professional engine builder that's making Hp...
62 your on point reason for having the older and newer model 4l80 both gotten for under $700.oo one came with the entire engine and harness.
its a old known thing that I've heard and read. Ask any Professional engine builder that's making Hp...
62 your on point reason for having the older and newer model 4l80 both gotten for under $700.oo one came with the entire engine and harness.
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Joined: Jan 2019
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Here you are DD.....I'm just better than the Avg 🐻.
How's that? I asked it Already from a Professional 😂 or read it.. just ramblings..
https://www.yellowbullet.com/threads...block.1714098/
How's that? I asked it Already from a Professional 😂 or read it.. just ramblings..
https://www.yellowbullet.com/threads...block.1714098/
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Verdad Gallardo From this article that quotes Frankenstein Racing Engines and Tony Mamo, it seems to depend if you're octane limited or not. If octane isn't an issue then iron ftw, but if octane limited then alum will allow a hotter tune up before detonation.
http://www.performanceracing.com/mag..._aluminum.html
http://www.performanceracing.com/mag..._aluminum.html
From this article that quotes Frankenstein Racing Engines and Tony Mamo, it seems to depend if you're octane limited or not. If octane isn't an issue then iron ftw, but if octane limited then alum will allow a hotter tune up before detonation.
http://www.performanceracing.com/mag..._aluminum.html
http://www.performanceracing.com/mag..._aluminum.html
Iron block certainly won’t move around as much at high power/rpm. Did a ton of R&D in my day with pro shop. Teams and other huge shops would pay millions...not kidding...for research and development with us and another shop in proximity to us. This was late 80’s early 90’s. I saw that two absolutely identical engines, one being aluminum head and other being iron head, the iron headed engine would make more peak power because the iron heads keep heat in the chamber longer. So iron heads win the power battle, but I’m talking 6-8 peak hp, which with the weight penalty of running iron heads, aluminum heads will always be faster.
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Iron block certainly won’t move around as much at high power/rpm. Did a ton of R&D in my day with pro shop. Teams and other huge shops would pay millions...not kidding...for research and development with us and another shop in proximity to us. This was late 80’s early 90’s. I saw that two absolutely identical engines, one being aluminum head and other being iron head, the iron headed engine would make more peak power because the iron heads keep heat in the chamber longer. So iron heads win the power battle, but I’m talking 6-8 peak hp, which with the weight penalty of running iron heads, aluminum heads will always be faster.
I will never use an iron block due to the weight and heat penalty.
A dart aluminium block is quite strong from what I read.
Even the LS9 block is too.
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Again I am not the avg 🐻
Larry Meaux
a back-to-back Dyno test on SBC
cast-iron Bowtie Block -vs- alum Block
everything exactly the same, just blocks were swapped
there was 30 HP difference at 600 rpm/sec
another back-to-back Big Block Chevy test = approx 40 HP
another back-to-back SS Hemi test on Cylinder Heads only
with cast-iron -vs- aluminum = 12 HP more w/cast-iron
same flow numbers + port vol CC's
the above were actual Dyno tests,
for theoretical HP/TQ differences between alum -vs- iron Blocks
by using FlowBench CFM Numbers -vs- what HP the different
block materials made on the Dyno =>
the results were=> for the same Flow CFM numbers,
i have yet to see an aluminum block engine make
the same HP/TQ that the cast-iron Block engine makes.
so far in all my Data,
the cast-iron Block always 100.0 % PerCent of time
makes more HP/TQ than an aluminum block
the last Dyno test was a recently as 2 months ago
with Brodix SBC and SB2.2 Heads
again the aluminum Block did not make as much HP
as the Flow Numbers suggested, about exactly the 30 HP
i found in those back-to-back Dyno test i did about 10 years ago
with another manufacturer's alum block -vs- Bowtie cast-iron.
to date, i have never seen an aluminum block make
1-the same exact power/torque as cast-iron
2-make more HP/TQ than cast-iron
it has always been LESS so far....
Older post, but aluminum blocks have gotten better with adding more meat in certain places to help with movement.
Larry Meaux
a back-to-back Dyno test on SBC
cast-iron Bowtie Block -vs- alum Block
everything exactly the same, just blocks were swapped
there was 30 HP difference at 600 rpm/sec
another back-to-back Big Block Chevy test = approx 40 HP
another back-to-back SS Hemi test on Cylinder Heads only
with cast-iron -vs- aluminum = 12 HP more w/cast-iron
same flow numbers + port vol CC's
the above were actual Dyno tests,
for theoretical HP/TQ differences between alum -vs- iron Blocks
by using FlowBench CFM Numbers -vs- what HP the different
block materials made on the Dyno =>
the results were=> for the same Flow CFM numbers,
i have yet to see an aluminum block engine make
the same HP/TQ that the cast-iron Block engine makes.
so far in all my Data,
the cast-iron Block always 100.0 % PerCent of time
makes more HP/TQ than an aluminum block
the last Dyno test was a recently as 2 months ago
with Brodix SBC and SB2.2 Heads
again the aluminum Block did not make as much HP
as the Flow Numbers suggested, about exactly the 30 HP
i found in those back-to-back Dyno test i did about 10 years ago
with another manufacturer's alum block -vs- Bowtie cast-iron.
to date, i have never seen an aluminum block make
1-the same exact power/torque as cast-iron
2-make more HP/TQ than cast-iron
it has always been LESS so far....
Older post, but aluminum blocks have gotten better with adding more meat in certain places to help with movement.