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Old 12-27-2007, 06:59 PM
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induction options and ideas for a 392 hemi

my plans was to run a 6/71 blower on my 392 for this year. before i make the purchase i just wanted to weigh my options. i have a single carb as well as a dual carb intake for this engine already. or i could go with a fuel injection set up. the blower set up with carbs will come in over $4k, if i could get a fuel injection set up that worked well for less i would consider it.

any ideas?
greg

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Old 12-27-2007, 08:30 PM
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Greg, I've been hard core Pontiac for over 45 years, but I have also had a strong interest in the old hemis. I have a good friend that is rebuilding his '37 Ford, powered by an injected 392, in my garage so I've been browsing for engine parts for him. I find dual quad set-ups frequently, but once in a while I have seen stack injection on places like racingjunk.com, The Hamb or on Hotheads website, in the parts for sale forums. It is my opinion that dual fours will work as good as injection, N/A on gas. With a blower or using alcohol is where FI shines. If you need links to some of the sites that might have injection units, you can either post here, or send me an email, but put something about 392 in the subjest line.

wdcreech@earthlink.net

Bill
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Old 12-27-2007, 09:08 PM
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Quote:
Originally Posted by atotalnincompoop
my plans was to run a 6/71 blower on my 392 for this year. before i make the purchase i just wanted to weigh my options. i have a single carb as well as a dual carb intake for this engine already. or i could go with a fuel injection set up. the blower set up with carbs will come in over $4k, if i could get a fuel injection set up that worked well for less i would consider it.

any ideas?
greg
Hilborn has an electronic 4 hole injector for about $5000.00 I'm saving my money my.
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Old 12-28-2007, 04:42 AM
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Is this a motor that you are currently building, or is it a running motor? What is the compression ratio? Usually, for a blown application you don't want to go far above a ratio of 8:1. Any more than that and you will have to start dialing back the boost. Withe the boost all in, your effective compression ratio should not be more than around 12:1 if you are using premium pump gas. On the other hand, if you have a 7.5:1 motor and want to normally aspirate it with a couple of 4 bbl carbs, you'll be way down on power to say the least..
My point is that your choice of induction system may already be narrowed down for you based upon how the engine was built. How about cam specs, type of pistons, head work, etc?
There are plenty of very knowledgeable Hemi and blower guys here, and with a few more details, we could better come up with some suggestions.
Hope this helps,
Steve
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Old 12-28-2007, 06:10 AM
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the engine is torn down at the moment, waiting for me to decide which way to go with it. the pistons are 9 to 1 right now, at the limit for supercharging i know. i just want a mild to moderate powered engine so i believe that 9 to 1 would work with both a low boost blower set up or a carb or efi set up.
thanks
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Old 12-28-2007, 06:13 AM
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i will buy a cam once i have decided on my induction, the heads will get the work they need at that point too. like i said before, i just want a streetable mild to moderate set up. nothing too hairy
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