Spark Plugs Question?
01-03-05, 12:47 PM
#4
Former Moderator. RIP Icemark.
That is an old racers trick back in the 50's and 60's and is generally not recommended on any modern engines with high compression (anything above 7:1).
01-03-05, 12:58 PM
#5
No more 7 or 8
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to be a little more technical. what you are doing when removing the washer, is you are moving the spark plug into the chamber more. this in turn makes the chamber "smaller" and increase the compression just a little. this is one of those things you do when racing. when every last little H.P. counts. on the street you will never even know.
as someone said before, when you have a higher compression engine the piston/rotor is already getting pretty close to the plug. making that gap small is just asking for the piston/rotr to hit the plug and cause catastrophic engine failure.
to sum it up, its not even worth it, it is something we do on our race car to get every last MPH / HP out of it. when you have to 40 race cars going down the streight at 150 MPH and one guy is doing 150.5 MPH, he is the guy who has done this.
does this help any.
and just a side note another racers trick we do is called indexing the plugs. this is when you take the spark plug mark the electrode point on the out side, and use shims to "make" the plug stop when the plug is facing the exhaust port. this will cause the flame front too travel tords the exhaust port that it is going to be exiting anyways, this way the ehaust does not have to change direction when the ehaust opens.
kinda hard to explain without showing you, but this is claimed at 1 H.P per chamber. (V8 = 8 H.P)
as someone said before, when you have a higher compression engine the piston/rotor is already getting pretty close to the plug. making that gap small is just asking for the piston/rotr to hit the plug and cause catastrophic engine failure.
to sum it up, its not even worth it, it is something we do on our race car to get every last MPH / HP out of it. when you have to 40 race cars going down the streight at 150 MPH and one guy is doing 150.5 MPH, he is the guy who has done this.
does this help any.
and just a side note another racers trick we do is called indexing the plugs. this is when you take the spark plug mark the electrode point on the out side, and use shims to "make" the plug stop when the plug is facing the exhaust port. this will cause the flame front too travel tords the exhaust port that it is going to be exiting anyways, this way the ehaust does not have to change direction when the ehaust opens.
kinda hard to explain without showing you, but this is claimed at 1 H.P per chamber. (V8 = 8 H.P)
01-03-05, 01:32 PM
#6
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Originally Posted by speeddemon32
to be a little more technical. what you are doing when removing the washer, is you are moving the spark plug into the chamber more. this in turn makes the chamber "smaller" and increase the compression just a little. this is one of those things you do when racing. when every last little H.P. counts. on the street you will never even know.
as someone said before, when you have a higher compression engine the piston/rotor is already getting pretty close to the plug. making that gap small is just asking for the piston/rotr to hit the plug and cause catastrophic engine failure.
to sum it up, its not even worth it, it is something we do on our race car to get every last MPH / HP out of it. when you have to 40 race cars going down the streight at 150 MPH and one guy is doing 150.5 MPH, he is the guy who has done this.
does this help any.
and just a side note another racers trick we do is called indexing the plugs. this is when you take the spark plug mark the electrode point on the out side, and use shims to "make" the plug stop when the plug is facing the exhaust port. this will cause the flame front too travel tords the exhaust port that it is going to be exiting anyways, this way the ehaust does not have to change direction when the ehaust opens.
kinda hard to explain without showing you, but this is claimed at 1 H.P per chamber. (V8 = 8 H.P)
as someone said before, when you have a higher compression engine the piston/rotor is already getting pretty close to the plug. making that gap small is just asking for the piston/rotr to hit the plug and cause catastrophic engine failure.
to sum it up, its not even worth it, it is something we do on our race car to get every last MPH / HP out of it. when you have to 40 race cars going down the streight at 150 MPH and one guy is doing 150.5 MPH, he is the guy who has done this.
does this help any.
and just a side note another racers trick we do is called indexing the plugs. this is when you take the spark plug mark the electrode point on the out side, and use shims to "make" the plug stop when the plug is facing the exhaust port. this will cause the flame front too travel tords the exhaust port that it is going to be exiting anyways, this way the ehaust does not have to change direction when the ehaust opens.
kinda hard to explain without showing you, but this is claimed at 1 H.P per chamber. (V8 = 8 H.P)
Guess we can't really do that though... be kinda hard to point the plug straight down. ;D
--Gary
01-03-05, 01:41 PM
#7
Remember the trailing plug holes are not open as are the leading. They have a very small opening into the "chamber". If you remove the gasket you run the risk of damage to the plug/rotor housing.
I'm also not saying the leading will work without the gasket and not strike the seal 'cause I just don't know the clearance.
I'm also not saying the leading will work without the gasket and not strike the seal 'cause I just don't know the clearance.
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01-03-05, 03:20 PM
#8
No more 7 or 8
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Originally Posted by Turbonut
Remember the trailing plug holes are not open as are the leading. They have a very small opening into the "chamber". If you remove the gasket you run the risk of damage to the plug/rotor housing.
I'm also not saying the leading will work without the gasket and not strike the seal 'cause I just don't know the clearance.
I'm also not saying the leading will work without the gasket and not strike the seal 'cause I just don't know the clearance.
i agree, i also do not know the clearances, i am not saying that by doing this you will have a problem, because i just do not know. i was just telling you what the point of all of it was.
also just cause, there is a plug that a rotary racer was running out in Palmdale. i have not personally done this, but he was using them. it was an autolite part number 2526 spark plug. it just a normal everyday spark plug that this guy was using. this allows him to change gap and all that. i thought about trying it out. ohhh yeah and the best part, these plugs are "normal" price. ~$1 instead of $5-$8
anyways, just wanted to let you all know. thought i would share the knowlage.
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