@ 5 lbs of boost is an intercooler needed?
10-27-2020 | 11:12 AM
#32
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that’s interesting you didn’t need an intercooler at that boost level.
tommy was a hell of an engine builder. If the heads flow really well and you have the right cam, you don’t need to make crazy boost to make good hp.
I def will run an intercooler just make sure it doesn’t detonate as it’s a new combo and I don’t have Tommy’s experience
tommy was a hell of an engine builder. If the heads flow really well and you have the right cam, you don’t need to make crazy boost to make good hp.
I def will run an intercooler just make sure it doesn’t detonate as it’s a new combo and I don’t have Tommy’s experience
10-27-2020 | 11:14 AM
#33
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Joined: Feb 2004
Posts: 2,590
Likes: 173
From: Endicott, NY
that’s interesting you didn’t need an intercooler at that boost level.
tommy was a hell of an engine builder. If the heads flow really well and you have the right cam, you don’t need to make crazy boost to make good hp.
I def will run an intercooler just make sure it doesn’t detonate as it’s a new combo and I don’t have Tommy’s experience
tommy was a hell of an engine builder. If the heads flow really well and you have the right cam, you don’t need to make crazy boost to make good hp.
I def will run an intercooler just make sure it doesn’t detonate as it’s a new combo and I don’t have Tommy’s experience
10-27-2020 | 10:53 PM
#34
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Joined: Sep 2001
Posts: 5,769
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From: tn
I found the article.
5.3 LS motor.
Flat top pistons.
Factory bottom end.
$2,700 heads.
$1,000 intake
$ 800 worth of injectors
Big throttle body..
620/281 hydraulic roller cam
$1,600 dual core intercooler
Twin 76mm turbos
RACE GAS.
695hp at 6600 rpm.
5.5 psi
With that huge intercooler, the motor was "seeing" 5.5 psi at 115 degrees. Before the intercooler, there was probably 8.5 psi at 200 degrees.
Your original post was questioning the need for intercoolers on a 5psi build. You need to understand that the magazine build was NOT a 5psi non-intercooled motor. It was a 8 or 9 psi non-intercooled motor WITH an intercooler. Without race gas, it would have holed a piston in short order.
In a boat, running 91/93 pump gas, you have a lot of things to balance to keep things happy at wide open throttle. Cooling is one of the most significant. Rising intake charge temps are a big deal unless you run short bursts or have sufficient intercooling. 6600 rpm boat engines also need huge oil coolers.
Keeping a stock bottom-end 5.3 together at 6600 rpm and 600hp is its own form of luck.
I would hate for you to beat up the combustion chambers of those nice expensive heads because you were dead set on using junkyard donors to prove some point..
Anybody can slap together something to do a few 1/8 mile runs a month in a S-10 with drag radials.
Building a 600hp engine to run wide open in a boat for 20 minutes solid takes a different approach.
Everybody has to learn at their own pace. It was a lot of years ago that I put a 100 shot of nitrous on a Merc 260/5.7 Alpha. Since the boat was light, it lasted for almost 3 bottles before it put a rod thru the block.
LS Gen 3 motors are superior to the 5.7 in every way, but I hope luck runs strong in your neighborhood.
5.3 LS motor.
Flat top pistons.
Factory bottom end.
$2,700 heads.
$1,000 intake
$ 800 worth of injectors
Big throttle body..
620/281 hydraulic roller cam
$1,600 dual core intercooler
Twin 76mm turbos
RACE GAS.
695hp at 6600 rpm.
5.5 psi
With that huge intercooler, the motor was "seeing" 5.5 psi at 115 degrees. Before the intercooler, there was probably 8.5 psi at 200 degrees.
Your original post was questioning the need for intercoolers on a 5psi build. You need to understand that the magazine build was NOT a 5psi non-intercooled motor. It was a 8 or 9 psi non-intercooled motor WITH an intercooler. Without race gas, it would have holed a piston in short order.
In a boat, running 91/93 pump gas, you have a lot of things to balance to keep things happy at wide open throttle. Cooling is one of the most significant. Rising intake charge temps are a big deal unless you run short bursts or have sufficient intercooling. 6600 rpm boat engines also need huge oil coolers.
Keeping a stock bottom-end 5.3 together at 6600 rpm and 600hp is its own form of luck.
I would hate for you to beat up the combustion chambers of those nice expensive heads because you were dead set on using junkyard donors to prove some point..
Anybody can slap together something to do a few 1/8 mile runs a month in a S-10 with drag radials.
Building a 600hp engine to run wide open in a boat for 20 minutes solid takes a different approach.
Everybody has to learn at their own pace. It was a lot of years ago that I put a 100 shot of nitrous on a Merc 260/5.7 Alpha. Since the boat was light, it lasted for almost 3 bottles before it put a rod thru the block.
LS Gen 3 motors are superior to the 5.7 in every way, but I hope luck runs strong in your neighborhood.
