Advanced Induction 241's gain 41RWHP/32RWTQ (Stock Valves!)
03-31-2011, 11:19 AM
#41
LilJay...I think you're asking more about DCR or cranking compression (psi)
which is affected by cam timing events (dur.,ICL,LS, etc) and yes given a set
static compression ie(10:1 or 11:1) too small or the wrong cam can build more
cylinder pressure than a certain octane of fuel can support (detonation)
However the unforseen argument which developed here is essentially
how much of the 41HP gain was the port-work worth VS. the 1.5 pt. increase
in static compression. I remember an old artical approx. 20 yrs ago where on
a 440 chrysler wedge they left everything the same but changed compression
From 7to1^9:1 gained about 11%; 9:1^11:1 only 5.5%; lastly 11:1^13:1-2%
Simply put it's a law of diminishing returns and on a street engine probably
affects torque more under 4000rpms or so
I would be shocked if even 8 -10 of this total gain was due to the bump@11.5
Basically IMO gaining about 30 horse from only a 15cc increase in port volume
and flowing that improvement past the production valve is flat out AWESOME
Clearly this fella understands airflow efficiency
which is affected by cam timing events (dur.,ICL,LS, etc) and yes given a set
static compression ie(10:1 or 11:1) too small or the wrong cam can build more
cylinder pressure than a certain octane of fuel can support (detonation)
However the unforseen argument which developed here is essentially
how much of the 41HP gain was the port-work worth VS. the 1.5 pt. increase
in static compression. I remember an old artical approx. 20 yrs ago where on
a 440 chrysler wedge they left everything the same but changed compression
From 7to1^9:1 gained about 11%; 9:1^11:1 only 5.5%; lastly 11:1^13:1-2%
Simply put it's a law of diminishing returns and on a street engine probably
affects torque more under 4000rpms or so
I would be shocked if even 8 -10 of this total gain was due to the bump@11.5
Basically IMO gaining about 30 horse from only a 15cc increase in port volume
and flowing that improvement past the production valve is flat out AWESOME
Clearly this fella understands airflow efficiency
03-31-2011, 11:32 AM
#42
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LilJay...I think you're asking more about DCR or cranking compression (psi)
which is affected by cam timing events (dur.,ICL,LS, etc) and yes given a set
static compression ie(10:1 or 11:1) too small or the wrong cam can build more
cylinder pressure than a certain octane of fuel can support (detonation)
However the unforseen argument which developed here is essentially
how much of the 41HP gain was the port-work worth VS. the 1.5 pt. increase
in static compression. I remember an old artical approx. 20 yrs ago where on
a 440 chrysler wedge they left everything the same but changed compression
From 7to1^9:1 gained about 11%; 9:1^11:1 only 5.5%; lastly 11:1^13:1-2%
Simply put it's a law of diminishing returns and on a street engine probably
affects torque more under 4000rpms or so
I would be shocked if even 8 -10 of this total gain was due to the bump@11.5
Basically IMO gaining about 30 horse from only a 15cc increase in port volume
and flowing that improvement past the production valve is flat out AWESOME
Clearly this fella understands airflow efficiency
which is affected by cam timing events (dur.,ICL,LS, etc) and yes given a set
static compression ie(10:1 or 11:1) too small or the wrong cam can build more
cylinder pressure than a certain octane of fuel can support (detonation)
However the unforseen argument which developed here is essentially
how much of the 41HP gain was the port-work worth VS. the 1.5 pt. increase
in static compression. I remember an old artical approx. 20 yrs ago where on
a 440 chrysler wedge they left everything the same but changed compression
From 7to1^9:1 gained about 11%; 9:1^11:1 only 5.5%; lastly 11:1^13:1-2%
Simply put it's a law of diminishing returns and on a street engine probably
affects torque more under 4000rpms or so
I would be shocked if even 8 -10 of this total gain was due to the bump@11.5
Basically IMO gaining about 30 horse from only a 15cc increase in port volume
and flowing that improvement past the production valve is flat out AWESOME
Clearly this fella understands airflow efficiency
04-02-2011, 10:22 PM
#48
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Lmao taco bell!! can't wait to send my heads to AI I just wanna show my friends under the hood the 241 casting number and the look on there face busting out low 12s high 11s 
01-21-2012, 06:45 PM
#53
Doesn't matter what head you go with whether it be stock ported, 243 stock or ported, AFR, TFS, PRC etc some of the power increase you get is from compression as all of those have smaller chambers than stock. So what is your point other than trying to stir up ****.
01-22-2012, 11:48 AM
#54
Looks like a great setup for a heavy GTO. People now a days get caught up in peak horsepower numbers but unless you have a cutup 3000lb car with a 4800 stall power under the curve. I never get asked how much tq will this setup make.
01-22-2012, 11:51 AM
#55
Also who cares how much the compression added by itself. Why would you ever do a na setup and not optimise compression? I'm sure your customer is happy with the way his car drives and that's what really matters. This is the difference between proper though out parts and just picking out parts.
01-23-2012, 08:31 AM
#57
Your results are about what we saw back in 04 with stock (good) ported heads and smaller Cams -we ran TR224's. The compression helps down low and the torque curve.
Problem nowadays is people instantly look at the peak hp #'s and not what actually makes the car move.So everyone put's in bigger cams.
Problem nowadays is people instantly look at the peak hp #'s and not what actually makes the car move.So everyone put's in bigger cams.
absolutly.......good work backed up with good tuning will yield good results........
OP i made basically the same power with a stock LS2 GTO with a mild lobe AI 226/234 cam and a old FAST 90 intake.......great numbers for a 241 headed 347!!! nice job!!!
01-26-2012, 07:33 PM
#58
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How did y'all get in touch with AI ?
What did it take , A Psychic , I tried to let them do my heads for me an it was no hope, they told me to Email them an I did an left my number , never heard from them but I just moved on the the next person .
What did it take , A Psychic , I tried to let them do my heads for me an it was no hope, they told me to Email them an I did an left my number , never heard from them but I just moved on the the next person .
01-27-2012, 11:04 AM
#60
I have responded to all new inquiries in my Sales @ Ai inbox except for a few I have received since yesterday evening. I have not noticed anything in my spam folder either that looks legit. You can always try again in the future if you'd like to upgrade to a better setup. Good luck w/ your project!
We are a small business, and we do not have operators standing by
. The down side is that you may wait for a response, and the upside is that the work is exceptional in the industry since I still perform all critical machine work myself.If anyone did email and did not receive a response, then it must have not only been sorted to spam, but had an oddball email address/subject line that didn't stand out as legit when I scan through my "spam" every couple days. If that is the case, people can certainly PM me w/ their email address/info and I can get back to them.
Hope that helps!
-Phil