black smoke?
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
The biggest differences in the turbo 7.3 and the NA 7.3 is the oil cooler has more fins per inch on the turbo motor and the wrist pins are bigger in the turbo motor.
The oil cooler is the only change that was a real improvement for the turbo engine because of the extra heat in the oil from the piston cooling jets and going through the turbo.
The bigger wrist pins are just more rotating weight.
Ever see the bottom end of an IDI engine?
Small is not really a very good description.
If you want to carry all the main caps and crank at the same time, you better eat your Wheaties first.
The oil cooler is the only change that was a real improvement for the turbo engine because of the extra heat in the oil from the piston cooling jets and going through the turbo.
The bigger wrist pins are just more rotating weight.
Ever see the bottom end of an IDI engine?
Small is not really a very good description.
If you want to carry all the main caps and crank at the same time, you better eat your Wheaties first.
Posting Guru
Joined: Sep 2007
Posts: 2,207
Likes: 1
From: Las vegas
There are several other minor diffrences in the factory turbo 7.3 the tops of the pistons are anodized, the rings are diffrent and on the top end they use inconel valves to disipate heat better and a head gasket with beefed up fire rings and a armor wrapping.
I've been told all kinds of myths about the N/A motors compared to turbos 2 guys at work swear that the turbo motor has an 18-1 comprsion ratio. But it is the same as the non turbo IDI
I've been told by my budy that works for ford that the bottom end wont last because of the smaller wrist pins, not his belife but what he overheard some old timers say'n.
Oh also the IP, injectors and dampner are diffrent on the turbo motors most likely due to the diffrence in rotating mass.
I've been told all kinds of myths about the N/A motors compared to turbos 2 guys at work swear that the turbo motor has an 18-1 comprsion ratio. But it is the same as the non turbo IDI
I've been told by my budy that works for ford that the bottom end wont last because of the smaller wrist pins, not his belife but what he overheard some old timers say'n.
Oh also the IP, injectors and dampner are diffrent on the turbo motors most likely due to the diffrence in rotating mass.
Elder User
Joined: Jan 2008
Posts: 576
Likes: 0
From: Central Coast CA
and what is the formula for figuring out what your compression ratio is when the turbo is pushing boost? I know you've got to plug it in with the compression ratio formula. right?
i know
haha
Posting Guru
Joined: Sep 2007
Posts: 2,207
Likes: 1
From: Las vegas
Yup I'm betting either they are confused and were looking at the 94.5 book because they cant seem to find the book they read it in, but know we all agree that its 22.5-1 since i have a 6.9 in there now people are taking bets as to when the turbo blows it up I'm going with when I get all the stuff together to swap a 6bt in it and decide to see how fast i can get that 6.9 to go nah I woulld probly sell the motor intact its not even broke in yet from the gactory 79,000 on it when the buss it was in was parked now running like a raped ape. actualy I dive my truck way too easy i have to take it out on the weekends and beat the carp out of it to keep my millage from going down the toilet.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
No Dave, I haven't, Don't want to either!
Except for pics of someone else's ...
Thanks for the pic!
Pretty beefy!
Shss, Don't tell my motors, but I really do want to get my hands in one.
-Enjoy
fh : )_~
Except for pics of someone else's ...
Thanks for the pic!
Pretty beefy!
Shss, Don't tell my motors, but I really do want to get my hands in one.
-Enjoy
fh : )_~
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
I ain't afraid, been in many hundreds of motors...
It's the light wallet part that bothers me!
-Enjoy
fh : )_~
It's the light wallet part that bothers me!
-Enjoy
fh : )_~
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
I use an online calculator for most of of the questions I am asked about effective compression ratios.
There are several other calculators on the same page.
Here is the link.
SuperMotors Automotive Calculators | SuperMotors.net
That calculator is not exact, but close enough for most applications.
There are several other calculators on the same page.
Here is the link.
SuperMotors Automotive Calculators | SuperMotors.net
That calculator is not exact, but close enough for most applications.
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