Semi-turbo
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Semi-turbo
I don't mind being pestered. Keeps me on track. Actually, I just ordered my connecting rods today, and will be sending them off to be shot peened as soon as they get here. Now to order the pistons, and have them coated-
Postmaster
Joined: May 2002
Posts: 3,241
Likes: 3
From: Broken Arrow, OK
Semi-turbo
Belt driven turbos have been around since the late 50's or early 60's. We know them as centrifugal superchargers. All they are is the impeller from a turbo that is spun by the crank through a tall overdrive. There is still considerable lag with this design. The impeller has to have rpm to make boost, which means the engine has to rev.
Two small turbos mounted to EFI manifolds would spool faster than the truck will take the power and maintain boost for more rpm than the engine has any business spinning. This is the route I'll be taking when I get around to building my turbo engine.
Two small turbos mounted to EFI manifolds would spool faster than the truck will take the power and maintain boost for more rpm than the engine has any business spinning. This is the route I'll be taking when I get around to building my turbo engine.
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Semi-turbo
Well, I haven't really thought too much about the machine work just yet. I will probably have L&L in Groton do the work on the block, and straighten the head out. They are expensive, but worth it.
knocturnal- that is part of the whole top secret thing. Be patient, everybody will get a chance to see it.
knocturnal- that is part of the whole top secret thing. Be patient, everybody will get a chance to see it.
New User
Joined: May 2002
Posts: 11
Likes: 0
From: California
Semi-turbo
You guys really need to understand how a turbo works before giving advise to this guy. A turbo works off the heat in the exhaust and as it enters the turbo wheel it expands causing the turbo to spool. A turbo don't care how much exhaust pressure comes out. The hotter the exhaust, the more boost you get to a point. The new heavy diesels are now pushing the 32 psi mark. Most turbos that were installed on a gas engine would only produce 8 psi before the waste gate would open.
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Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Semi-turbo
If it's heat that makes the turbo spool, which it's not, then why do the diesel trucks have to pay so much attention to exhaust temperatures when modifying their engines? Air expands with heat, so if air is expanding in the turbo, then it would have to be getting hotter, but the air is already hot from combustion. It might get a bit hotter from the pressure against the turbo, but that's not what is making the impeller spin. Since the exhaust must pass by the impeller as it exits the engine, the more pressure there is on that impeller, the faster it's gonna spin. And as for gasoline engines only making 8 psi of boost, I don't think pump gas will allow a whole lot more than that without pinging like hell. Since diesels run by tuned detonation, the more air they can squeeze in there, the better off they are.
Last edited by EPNCSU2006; Mar 4, 2003 at 10:47 AM.
Posting Guru
Joined: Jun 2002
Posts: 1,288
Likes: 1
From: redding U.S.A.
Semi-turbo
even if the heat is what makes the turbo spool up, it wouldn't matter because a 300 lacks the flow of exhaust to give that heat to the turbo.
The exhaust output of a huge diesel engine is entirely different than a 300 (although i'd like to claim my 300 is a diesel usin gas
) Slapping a huge turbo from a big truck is not a good idea.
The exhaust output of a huge diesel engine is entirely different than a 300 (although i'd like to claim my 300 is a diesel usin gas
) Slapping a huge turbo from a big truck is not a good idea.
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