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Lower KR ?

stlmo_gtp

stlmo_gtp

New member
As i do understand what KR is I was just wondering what mods will lower your KR ? i already know that an Inter Cooler will do it but what else ?
 


About anything that helps the engine breathe, as less restriction will keep it cooler and less prone for hotspots which cause knock.
 
stlmo_gtp said:
ok so like a breather
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A crankcase breather? No, that's not going to help knock. Completely different type of breathing.

stlmo_gtp said:
a throttle body heat shield,
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Good idea in theory, but hardly does squat. Still, it's thinking is in the right place (cooler intake charge).

stlmo_gtp said:
CIA or FWI,
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They will help cool down the intake charge, and cooler air helps.

stlmo_gtp said:
and IC ?
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That will help a lot. You're missing some of the big ones, though. Plog/ported rear manifold/DP or headers. Rockers. That sort of thing.
 
o i meant the breather for the valve cover, but i have a feeling that it doesn't do to much either, i figured that headers would do it, i didn't think that rockers would but.... what about push rods that have the bigger holes for the oil to go threw ?
 
stlmo_gtp said:
o i meant the breather for the valve cover, but i have a feeling that it doesn't do to much either,
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That is called the crankcase breather. It's purpose is for ventilating the crankcase when you have to remove your PCV system or if you have more blow-by gases than the PCV can handle (such as with a turbo).

Like I said, it's not for knock. It keeps you from blowing certain seals and gaskets in your block.

stlmo_gtp said:
i figured that headers would do it, i didn't think that rockers would
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Why not? They're opening the valve a lot more so more air can enter and exit more quickly.

stlmo_gtp said:
but.... what about push rods that have the bigger holes for the oil to go threw ?
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I don't see why that would have any effect on knock...
 


you're looking to get two things done to lower KR:
First is getting cool air efficiently into the engine, whether it be by a less restrictive and well insulated intake, to an intercooler, rockers, cam, etc.

Second is getting the air that you suck into the engine, OUT of the engine. All the above won't help you unless you have a way to expel the hot gases out of the combustion chamber. Believe it or not, you can't always get everything out of the chamber, and some does end up getting left behind.

First and foremost with these engines, you want it in good running condition. Carbon buildup will cause KR, this is because it tends to create inconsistent temperatures on the pistons, valves and such (carbon retains heat). Spark plugs play an important part in this (as Lee and I have gone over this issue time and time and time and time again). I will go as far as to say that just "certain" types of plugs are not good for forced induction engines, as they will also retain heat and remain a hot spot depending on the material they are made of and the shape of the electrode. I will give Lee credit on this issue, as he has somewhat disproved certain platinum/iridium plugs.

I guess what I'm saying is, be prepared ahead of time for what you plan on doing, and then go a step further. If it's running like poo now, then it's not going to be in the best performance condition later.
 
cool thanks it runs great right now, like a champ for have 155,xxx miles, here where my plans finish my exhaust (i have the cat-back on the way but i am still going to get some headers) then order a machined intake, IC, and a ported blower. Then get some ported and polished heads and probably go ahead and get the valve ports bored a little more to go with a oversized valve, rocker arms, then a cam, i don't really know if there is a certain order that i should go in but here where my thoughts: first finish my exhaust, then buy some extra heads to get ported and polished and basicially build those outside the car add oversized valves, the rocker arms, etc.... then order the machined intake along with the ported blower and IC and then just go ahead and install all that stuff at one time, and then throw my cam in there. Is this somewhat of a good way to do it ?
 


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