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Which spark plugs?

spyysee

Well-known member
Joined
Jun 15, 2002
Messages
124
Location
NY LI Metro
Corvette
1987 black beauty, all ez mods, owned '62,'78
With or without the washers??

'87 aluminum heads
 

BigRed

Well-known member
Joined
May 23, 2001
Messages
948
Location
Edmonton
Corvette
1985 Bright Red Rocket
I use with washers on my vehicles with aluminum heads.

Never really thought about that before though but Id think with washers the plug and the head would'nt corrode together and you might have a chance getting them out later.

Thats my guess (Think I used them on my Vette to) Cast heads
 

Topless

Well-known member
Joined
Nov 12, 2001
Messages
444
Location
San Diego, CA
Corvette
1992 Convt w/hard top; 2004 Z06 Z16; 1962 327/300
Lots of people on here like the Bosch platinum +4's. I will be switching to those here quick too.

Mike

ps- don't know if they come with washers or not.
 

jeepie

Well-known member
Joined
Feb 6, 2002
Messages
162
Location
Dunmore, Pa.
Corvette
1991 Coupe Blk/Blk
I am running NGK plugs and they do come with washers.
 
S

Shadowing1985v

Guest
umm

im running Bosch rapid fires
se the 4+ makes sure u get a spark each time, whre the rapid fires will fire twice as fast,, sparking more rapidly im not sure which one is better, but im thinking of buyin the 4+ cause i think the rapid fires are messing up my idle
 

spyysee

Well-known member
Joined
Jun 15, 2002
Messages
124
Location
NY LI Metro
Corvette
1987 black beauty, all ez mods, owned '62,'78
The owners manual says fr3ls. they come with washers!!!

yet, the service manual says tapered, no washers!!!!


whats the freaking right answer???
 

cntrhub

Well-known member
Joined
Jun 17, 2002
Messages
390
Location
North Hollywood, Ca.
Corvette
Miss my '62 & '80 4- Sp. Vettes
factory fit

Yes, the manual is correct....stay stock! Here are a few problems using a washer.
1. The plug tip is now recessed (using a washer) and hampers a good spark to begin the "flame front."
2. Recessed plugs expose threads. Carbon build-up will occur. When you, or the next person installs the plugs correctly, (i.e., as per-manual) the now carboned aluminum threads will take the brunt of the spark plug being sent home. Not only will the threads be damaged by the plug, but now, the plug's threads at the tip will become flat. When it's time to pull the plugs out, there goes the rest of the undamaged threads at the higher end of the aluminum plug hole.
3. Using a washer under a tapered plug and/or hole, creates slight combustion loss.
Hope these variables help you to understand why it's so important to stay stock, and stop trying to out engineer the engineer.
 
S

Shadowing1985v

Guest
umm.. forgot to mention

when u buy boshe spark plugs

or just any spark plug, and u put them in yoru self, dont' forget to space them


corvette needs to be at .3500 well for the 85, that is,, i think it is for 84 to 96's



anyways, answer this for me,, my spark plugs keep geting crap on them,, itsnot oil, i didn't hink it was carbon,, its just black dust like stuff,,

so i just stick it in my sand blaster, sand blast it and stick them back in,,,,, also,, for u 85 to like 91 models out there, not sure what models this applies, too,, but,, on my model,, "85",, my D cap kept collecting,, white stuff on each contact,, i neverknew why,, so after sevearl times,, i kept buying new,, caps cuase its a pain to sand those off,, but then i finally,, boguth brass tips,, and its life time warenty,, as well,, hehe,, so then it won't get white stuff on it,,,, then i notice why,, when i replaced my ICM chip one day,, whre the wire goes into the D Cap the little plastic there was lightly cracked,, letting moister into it,, sigh,, so i sliaconed it, hehe,, its the side of the passenager side, guy's,, ,, just wanted o mention this, fo those,, that have this problem
 
D

Drewser

Guest
Huhhh?

Dude...what planet are you from?
Do you really think that your choice of plugs make them fire twice as fast?
Do you speak english as a first language? Couldn't prove it by me!
 

cntrhub

Well-known member
Joined
Jun 17, 2002
Messages
390
Location
North Hollywood, Ca.
Corvette
Miss my '62 & '80 4- Sp. Vettes
shadowing's funny white stuff

There is a constant presence of air inside the D cap. Nature tends to keep things at 14.7 psi most of the time. No matter what you do, short of vacuum sealing the D cap, you cannot eliminate nature and her wet air. The reason you see the "white powder" is because of the arching process, during it's 360 degree cycle. The spark creats the powder from the wet air. This is the result from arching the damp resedue inside the distributor cap.
Most spark plug failures occur (fouling) inside the center electrode... where sand blasting cannot reach. The fine grit lodged in between the spark plug's threads are a matter of concern! You could possibly damage the head's plug thread when installing. Electricity tends to find the shortest path. And if a plug's center electrode sparks before jumping the side electrode, as designed, sand blasting will not help.
 
S

Shadowing1985v

Guest
thanx

hey, was that comment on the rapid fire to the 4+ on bosche,, dude thats how it works,, 4+ has 4 points,, and rapid fire, has wierd looking tip,, that will sit there and stagard the spark,, or something,, if im wrong, ,then how does it work, i may be wrong,, its my guess,,,and so far its th eonly answer i have,, rapid fires are more epensive then 4+ i think,, min ewa slike 7 a piece it was like a dollar differance



and yeah i know why the white stuff is there, i have bras tips now though the white stuff, won't get on it as easy
 

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