. my bad 
I can not believe this
Thread Starter
TECH Regular
Joined: Feb 2005
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From: Davidson, NC
I can not believe this I did a head/cam swap last year and lost 40rwhp. So I started changing the heads again and found out I didnt plug in one of the fuel injectors,last one on the drivers side 
:boiling . I cant believe I missed that. My question is since I made 303rwhp on 7 cylinders about how much should I have made on all 8?
:boiling . I cant believe I missed that. My question is since I made 303rwhp on 7 cylinders about how much should I have made on all 8? Trending Topics
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Originally Posted by narcszm
303 × 8 / 7 = 346
Your equation would be true if the piston/rod had been left out of the motor altogether.
Formula-T/A, I guess we now know why GM didn't make the LS1 a V7 engine, huh??
Last edited by BurnOut; Apr 19, 2005 at 02:57 PM.
TECH Enthusiast
Joined: Jul 2004
Posts: 546
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From: Washington
Originally Posted by BurnOut
Not really true. What that equation doesn't take into consideration is the dead cylinder that the motor was dragging... not only the friction of it, but also the weight, and the resistance from the compression stroke (with no power stroke in return).
Your equation would be true if the piston/rod had been left out of the motor altogether.
Your equation would be true if the piston/rod had been left out of the motor altogether.
1. You're going to have the friction losses whether the cylinder is firing or not. In fact, due to the lateral movement of the piston at ignition and during the power stroke, the friction incurred is actually higher than if the cylider didn't fire.
2. The work required to compress the air during the compression stroke is actually regained, to some extent, during the power stroke. Because both valves are closed betweed TDC and to a point just before BDC, that higher-than-atmospheric-pressure air charge in the cylinder is helping to move the piston back down. [the spark plug is still sparking, so there is some expansion of air due to the heat transferred from that, as well as from the heat in the combustion chamber warming the air in the cylinder, if you really want to pick nits]
So, you're right, the eight sevenths calculation is not entirely accurate. But it's close enough for him to estimate the amout of rwhp he would have been making had that eighth cylinder been firing.
Do you agree with that, too, itchygomey?
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Joined: Sep 2003
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From: "Tr"Asheville
It's weird but I've started my car up a few times before forgetting to plug one of the spark plug wires in and the car ran perfectly fine. You couldn't tell at all from idle and no codes, weird.
-Sly
-Sly
