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post #1 of (permalink) Old 09-06-2006, 06:32 PM Thread Starter
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New engine HP and Torque

Anyone have a good guess as to how much HP and torque my new engine will make. I need to figure out what size injectors to buy for the MegaSquirt TBI.

1981 AMC 360
60 over
Camshaft 466 lift 207 dur 112 lob sep
Edlebrock Performer intake
Completely rebuilt and balanced
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post #2 of (permalink) Old 09-06-2006, 09:17 PM
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Re: New engine HP and Torque

60 over will not change displacement much, and the cam is rather mild. So I would say about stock or a little better then stock, maybe 10% more.
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post #3 of (permalink) Old 09-06-2006, 09:48 PM Thread Starter
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Re: New engine HP and Torque

[ QUOTE ]
60 over will not change displacement much, and the cam is rather mild. So I would say about stock or a little better then stock, maybe 10% more.

[/ QUOTE ]

Were can I find the stock figures that are accurite?
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post #4 of (permalink) Old 09-06-2006, 10:19 PM
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Re: New engine HP and Torque

[ QUOTE ]
So I would say about stock or a little better then stock, maybe 10% more.

[/ QUOTE ]

AMC V8 was never factory injected.

350 injectors would probably be adjustable enough.
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post #5 of (permalink) Old 09-06-2006, 10:20 PM
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Re: New engine HP and Torque

Atually I have been looking for the same for the last 1/2 hour as I did not know the HP off the top of my head. My 72 FSM lists 175 HP @ 4000 RPM and 285 ftlb @ 2400 RPM, these are net values as used from 72+, not gross as was used for 71-.

I have also found the fallowing web page. link Ofcoarse like everything on the web who knows how accurate it is.

As I am sure you know, going a little big will not be a bad thing. Big will make changes in injector open time have more effect, and therefore less ability to regulate low flow, like at idle. However going to small could cause an uncorrectable lean condition under high power conditions. However, going I little large will not significantly compromise lowend and will keep you safe on the highend. I would assume 250 to 300 HP for calculations.

Edit, I seem to remember someone using 350 chevy injectors on 258's without problems.

I have not seen him around lately, but TiminMB on this board did a Megasquirt on a 258 and would likely be a big help here. I think he started with a 350 Fuel map.
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post #6 of (permalink) Old 09-07-2006, 09:43 AM Thread Starter
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Re: New engine HP and Torque

There does not seem to be much information past 1972. It shows 175hp for a 2BBL and 195hp for a 4BBL. It does not look to me like the engines changed after that. I did find one source that says 140hp for 1978-1991. I simply can't believe that. What did they change to make this engine loose 50hp.

What I need to decide is do I get 55LB or 65LB injectors. If the engine has much over 200hp I am going to want the 65LB if it is much under 200hp I want the 55LB.
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post #7 of (permalink) Old 09-07-2006, 09:58 AM
 
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Re: New engine HP and Torque

I'd say 350 injectors will work just fine. A 350 bored 30 over is a 355 if i'm not mistaken. I know people will run 350 tb's/ injectors on a 383 with a custom burned chip. I dug around and didn't have any luck finding hp specs for your engine, i suggest looking on line for old jeep borcures.
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post #8 of (permalink) Old 09-07-2006, 10:19 AM Thread Starter
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Re: New engine HP and Torque

350 injectors come in 55LB and 65LB.
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post #9 of (permalink) Old 09-07-2006, 10:39 AM
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Re: New engine HP and Torque

FYI I can't find HP specs in the '78 FSM, nor was it listed in the engine description of the invoice or window sticker. My guess is that they were ashamed of it; they were really struggling to meet new emission regulations and the power output and driveability were pitiful.
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post #10 of (permalink) Old 09-07-2006, 10:38 PM
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Re: New engine HP and Torque

They also changed from rating by gross hp to net hp. Gross is with nothing on the engine, net is with all accessories.
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