what motor would you turbo?
#701061
05/18/10 12:53 AM
05/18/10 12:53 AM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
OP
master
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OP
master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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I'm planning out a turbo for my 74 club cab dually. Automatic. Will be used for regular driving, and some hauling. The truck is set up for a big block already, and I have 2 motors that are prime candidates. Both are stockers, unmolested, and run awesome, with no smoke or ticking. Kinda cool. 1)76 400. it's out of a cordoba/charger. untouched, with the tq still on. 452's yadda yadda yadda 2)69 383 2bbl. Also untouched, 906's, and runs smooth as glass. With eiher one, My plan was/is to leave the motor as stock as possible. Basic intake and carb change to match the turbo. A small turbo for quick spooling(torque is goal more than all out power). Intercooler to keep it from pinging under load, etc.. My debate is, does the larger displacement of the 400, and lower compression ratio, make it clearly more desirable for this build?(I agree it should make better power) OR does the steel crank and the still pretty low comp a 2bbl 383 has make it the better choice? Both are in mine already, so there is no money involved. I'v measured 400's to typically be around 7.5:1 compression. I measured a 68 2 bbl 383 once, and it was on the low 8's, so I would expect this 69 to be similiar. Any input appreciated 
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Re: what motor would you turbo?
[Re: dave571]
#701062
05/18/10 03:21 AM
05/18/10 03:21 AM
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Joined: Jan 2003
Posts: 2,697
Renton Wa
topfueldart
master
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master
Joined: Jan 2003
Posts: 2,697
Renton Wa
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I'd probably build the 383, just for the crank. I built a 318 instead of a 360, for the same reason. The little bit more compression may help the truck with pep at low RPM's as well. 7.5 is really low, even for boosted applications.
Put a performer on it with a 650-750 DP, blowthrough mod it, mild camshaft, surface the heads and use good gaskets. Theres a guy on theturboforums (and maybe here?) that goes by CW25 that did something pretty similar I believe.
Last edited by topfueldart; 05/18/10 03:23 AM.
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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Re: what motor would you turbo?
[Re: 72sat]
#701068
05/19/10 10:11 AM
05/19/10 10:11 AM
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Joined: Sep 2009
Posts: 24
Pasagetdowndena
Cranky
member
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member
Joined: Sep 2009
Posts: 24
Pasagetdowndena
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Quote:
400 has lower comp & bigger dia. pistons.It also has better heads(452).906s need to be ported & hard seats installed.both have cast pistons.steel crank does not matter because you are not going for max boost with cast pistons.No detonation,this will kill cast pistons.
How much difference are the ports between the 452's and the 906's?
Well, I'll tell ya...there's not enough difference between the ports of the two head to worry about but the good part about the 452's is that they have the hardened valve seats already...not that I ever sunk a valve in 906's.
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Re: what motor would you turbo?
[Re: Cranky]
#701069
05/20/10 02:39 PM
05/20/10 02:39 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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For a low-boost application in a truck I think either one on paper will be too similar to make a difference. I would do a leakdown check and use whichever one seals better. Oil leakage into the combustion chamber leads to detonation. OTH, I read somewhere that everyone destroys their first home-built turbo, so use whichever engine you like least. 
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Re: what motor would you turbo?
[Re: TheOtherDodge]
#701071
05/20/10 08:16 PM
05/20/10 08:16 PM
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Joined: Oct 2006
Posts: 4,590
Indy
joshking440
Lunch is on me!
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Lunch is on me!
Joined: Oct 2006
Posts: 4,590
Indy
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Quote:
"I read somewhere that everyone destroys their first home-built turbo"
Better not be true!  
Mine made it through the dyno session.....thats a start i hope, but i read the same thing
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Re: what motor would you turbo?
[Re: feets]
#701073
05/21/10 12:36 PM
05/21/10 12:36 PM
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Joined: May 2005
Posts: 1,642
Chicago, Illinois
donscuda
top fuel
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top fuel
Joined: May 2005
Posts: 1,642
Chicago, Illinois
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Quote:
Quote:
Would it be better if he said everybody drives their first turbo into the wall?
Not really...... 
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Re: what motor would you turbo?
[Re: feets]
#701075
05/23/10 06:04 PM
05/23/10 06:04 PM
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Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
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Quote:
Quote:
"I read somewhere that everyone destroys their first home-built turbo"
Better not be true!
Would it be better if he said everybody drives their first turbo into the wall?
OUCH!!! That will smart...lol.
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Re: what motor would you turbo?
[Re: ahy]
#701079
05/26/10 11:28 PM
05/26/10 11:28 PM
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Joined: Feb 2005
Posts: 350
Grande Prairie, Alberta, Can.
CW25
enthusiast
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enthusiast
Joined: Feb 2005
Posts: 350
Grande Prairie, Alberta, Can.
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Quote:
I guess I'd turbo the 383 with the heads from the 400. That gives you the forged crank and hardened seats. For your build, the few cubes difference won't matter and that saves the 400 block for your second engine.
That is exactly what I did but the large 452 chambers made for 7.4:1 compression. That makes for pretty soggy low end power. Had to crank up the boost to 15 psi but made 450+ HP with a basicly stock 383. Built the 400 with a stock 383 crank and 9:1 compression. It is a terror on the street and drives as super good.
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