Engine questions
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Engine questions
I have a 1971 f100 that currently has a 302. I am swapping a 390 in it's place eventually. I bought a motor and parts truck from a guy near me. The motor is a 360 block, 390 crank, and 360 rods with special pistons. I would like to put h-beam rods in it and I will be pulling it apart anyway just to check everything and I want it a different color and the gaskets not painted. I want to know if I should put h beam rods for a 360 and keep the pistons or swap everything-rods and pistons. I have also thought about a twin turbo set-up for it. Thanks in advance.
Lead Driver
Joined: Apr 2011
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From: El Dorado, Arkansas
I'm not an FE guy but, if you're building a power adder engine, the riciprocating assembly needs to be strong.
With a power adder (turbo(s) or supercharger) the compression ratio needs to be fairly low --on the order of 8:1 to 8.5:1 to avoid blown head gaskets or worse, detonation.
With a power adder (turbo(s) or supercharger) the compression ratio needs to be fairly low --on the order of 8:1 to 8.5:1 to avoid blown head gaskets or worse, detonation.
Fleet Owner
Joined: Dec 2009
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From: NorCal
Twin turbo? Ditch those heads. Aluminum heads, rocker stands, end supports etc will set ya back about $3500... minimum.
Turbo selection will need to be relatively small to mine turbo lag because they'll be spooling up by the time an FE runs out of RPM. Contact Turbonetics.
Stock beams are good up to 500 HP or so.
I suggest simply freshening up what ya got and get another block for the turbo build because the parts selections will be a totally different animal. H-beams yes.
Personally, I'd consider a supercharged FE before going with turbos.
Turbo selection will need to be relatively small to mine turbo lag because they'll be spooling up by the time an FE runs out of RPM. Contact Turbonetics.
Stock beams are good up to 500 HP or so.
I suggest simply freshening up what ya got and get another block for the turbo build because the parts selections will be a totally different animal. H-beams yes.
Personally, I'd consider a supercharged FE before going with turbos.
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I t was rebuilt, balanced, blueprinted. I want to go with aluminum heads. I will be using h beams no matter what. What's wrong with this block?
What options are available for superchargers for these motors?
What options are available for superchargers for these motors?
Fleet Owner
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From: NorCal
Don't know of a turbo system nor supercharger but a NOVI supercharger would be my preference.
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Sorry. I have all the paper work for it . It has been bored. .040 sonic checked, magnafluxed etc. You name it it's probably been done. I don't have paperwork on the heads though. I will be pulling it down no matter what.
Lead Driver
Joined: Apr 2011
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From: El Dorado, Arkansas
Superchargers react immediately to the acceleration of the engine while a turbo has some delay in needing the turbo to spool up before the power starts coming on.
However, for a 100 hp increase through the use of a turbo, the engine has to give up an average of 11 hp with the turbo for this increase.
The same 100 hp increase with a supercharger will come with an average loss of 30 horse power to drive the supercharger.
The power to run a turbo is more "free" in horse power losses compared to the parasitic power loss to drive a supercharger.
However, for a 100 hp increase through the use of a turbo, the engine has to give up an average of 11 hp with the turbo for this increase.
The same 100 hp increase with a supercharger will come with an average loss of 30 horse power to drive the supercharger.
The power to run a turbo is more "free" in horse power losses compared to the parasitic power loss to drive a supercharger.
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With where I am in my life and how much I want to do to it I think I'll build the motor to handle boost and decided which way is cheaper then.
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Fleet Owner
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From: NorCal
Accidents/incidents happen. What was the malfunction with your pal's system?
Cargo Master
Joined: Sep 2007
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From: Chandler, AZ
What are the current 'special pistons'? forged? what is the compression ratio?
How much power are you trying to make? What is your goal with the truck? EFI or carb? Boost and carbs have their own set of issues.
Good heads aren't as critical on a boosted application.
Nitrous is your friend.
If you want to make big power I think you'll want a forged crank too, at that point get a whole stroker assembly.
How much power are you trying to make? What is your goal with the truck? EFI or carb? Boost and carbs have their own set of issues.
Good heads aren't as critical on a boosted application.
Nitrous is your friend.
If you want to make big power I think you'll want a forged crank too, at that point get a whole stroker assembly.
Thread Starter
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New User
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What are the current 'special pistons'? forged? what is the compression ratio?
How much power are you trying to make? What is your goal with the truck? EFI or carb? Boost and carbs have their own set of issues.
Good heads aren't as critical on a boosted application.
Nitrous is your friend.
If you want to make big power I think you'll want a forged crank too, at that point get a whole stroker assembly.
How much power are you trying to make? What is your goal with the truck? EFI or carb? Boost and carbs have their own set of issues.
Good heads aren't as critical on a boosted application.
Nitrous is your friend.
If you want to make big power I think you'll want a forged crank too, at that point get a whole stroker assembly.
pistons:h304p (.040.) Custom compression height. Milled. .026"
I want to use fitech efi or something similiar. I'm not going to put a stroker in it considering I can buy a forged crank for<$500.
I don't know the compression ratio currently.