Free Mods?

[RoCKet]

Free horse power ?!?!?!?!?!?! let me know what yall think.....
http://www.ultimateresourceguides.co...-freemods.html

[DJJSR]

Indexing plugs can help with some combustion chamber designs, but the gain is miniscule at best. HOWEVER, that method of just tightening until it points in the right direction IS ABSOLUTELY WRONG. Sparkplugs have a torque specification. Tighten the plug to that specification and if it points in the wrong direction, get some indexing spacers.

Insulating fuel lines used to be pretty important, especially with older carburated engines that have been modified with headers or rerouted fuel lines. It's not much of an issue these days, but if you do have a fuel line that's close to a heat source, you can buy insulation that's make specifically for that. Check Summitt or Jegs catalogs.

[gomarlins3]

Originally Posted by DJJSR

HOWEVER, that method of just tightening until it points in the right direction IS ABSOLUTELY WRONG. Sparkplugs have a torque specification. Tighten the plug to that specification and if it points in the wrong direction, get some indexing spacers.

To build upon this point, the Insight has three cylinders. Each cylinder is designed to take one of 4 different spark plugs. Each plug has the same part number except for the last letter. Stamped into the block is an "A", "B", "C", or "D". That is the plug that goes in that cylinder. You have to order that EXACT plug, you can not mix them. If you do the car will run, but not as effectively as designed. Each plug (A, B, C, D) have their electrode in a different position in relation to the threads so that as you tighten to the specified torque, the electrode will face a specific way. I lucked out and each of my three cylinders take the same plug type (A), no worries about mixing up by accident. Not all Insights have the same plug for all cylinders.

[jagg]

Not all Insights have the same plug for all cylinders. Today 03:18 PM

Why?

Are they funneling exhaust gas from # one cylinder forward,
to be reburned 2 times on each engine cycle? I can see where this would be a more efficient way to reduce pollution, and build fuel economy in the process,
but the valve plumbing would be crazy, and the cylinders might have to be of slightly different sizes......or the timing could be infinitely variable and super-fast at adaptation....or, hmmmmm.
I've got studyin' to do.

I'm just askin' GM3, why the mismatched plugs?

Best Regards,
Jagg

[gomarlins3]

I am assuming that the electrode has to sit facing a specific way inside the cylinder for optimal burn. I guess the threads in the plug and the threads on the block have to line just right as you start them into the head and you must use the EXACT amount of torque to make sure THAT plug lines up perfectly in THAT cylinder. If you use a different plug, the threads won't line up just right and the electrode would face a different way inside the head. The engine would still work of course, but you would not get the optimal burn and efficiency.

This is just my reasoning, I could be completely wrong. I DO know that I am suppose to use the correct plug in each cylinder.

You would be really amazed at what was done to get 70+ MPG out of this car. The under side is so aerodynamic it's not even funny. It's not flat like a race car, but they put like things under to help with air flow and to keep areas from creating a low pressure zone.


OP- I am sorry for the OT discussion.

[DJJSR]

Go - I think you're right. I know when they manufacture sparkplugs, the side electrode is not always in the same place relative to the thread position. Honda must sort them by index before assigning the suffix to the part number. Then match them to the variation of the threads in the head. Good idea.

[MattG]

Here's another free mod (read the whole thing - it's good for a laugh)

http://www.mlazz.com/projects/14/index.htm

[DJJSR]

LOL!!! Best thing you could ever do to a Sentra, short of towing it to a junkyard.

[kgf3076]

This was an episode of the British car show (BBC on Monday night at 8:00pm). They took a sentra and by the time they were finished it was essentially 4 wheels, steering gear and a seat..everything else that could be unbolted, broken off or taken off with a sawzall was gone.