FE-FC Holden Discussion Forum

Just wondering what GO and NO GO means when adjusting spark plug gap on new plugs.

I can't understand how you get two different readings.

Thanks
Dave

While we are on spark plugs does anyone know the correct gap for spark plugs for a red 186
                                      Cheers Rusty

Not sure what you mean Dave  ???. I've never heard this term before.

Rusty,

Correct plug gap for HR is .033 to .038in

Cheers,

Graham

The manual just said:

0.033 in GO and 0.038 in NO GO

I'd never heard the terms before either.

You've answered my question in your last post though.

Regards
Dave

Hi Guys.

This is quite old terminology, but it means what it says.

A .033" feeler will be loose (in other words it will easily 'GO' in) & a .038" feeler will fit in (it will be a NO GO).

Dr Terry.

Thanks gp much appreciated mate,
                                         Cheers Rusty

Rusty,

With modern plugs, good spark leads and a good/new coil you can increase the gap slightly to 40 Thou or exactly 1.0mm.

Better/more complete burn of the fuel charge in the combustion chamber and more power and better fuel economy.

Tuning a car so it runs perfect is one of the best natural highs on the planet. Gotta love the sound of a Holden six when its running great.

Cheers,

Craig.

Thanks Craig,

A little off topic but continuing on what you have just said:

I've just bought myself a strobe light timing gun, and when I get my head back on am going to have a go at tuning it.

At present it is a YT head, stock cam, twin point dizzy, Holly, Headers with brand new plugs, leads, points, rotor arm, dizzy cap.

If I run premium fuel or even BP 98 RON, how much advance do you think I can set at idle?

Cheers
Dave

have to agree craig, theres nothing like a nice tuned holden 6.
I was going a bit further with my gap. 1.2 mm with a blue motor dizzy.

after building my motor the first time, the car wouln't run if you tried to get it near the timing mark.
you would probably be better to get a blue motor dizzy.
as for timing I take a spanner and do a few hot laps with the type of fuel in it I plan to use.

Thanks guys , this is what the forum does best,it gives great advise on any subject and for us non mechanics it is a godsend , you just have to ask and look and ask in the right sections of the forum.
                                         Cheers Rusty

Rusty,

Best bet to find the right timing for a modified engine is to set it to the standard timing setting (8 Degrees Below Top Dead Centre) and then make the final setting using the virtual engine dyno - a drive around the block. Keep advancing it until it starts to ping slightly under full load and then knock it back a few degrees. Sounds a bit rough but it will work and saves a trip to and the expense of a dyno. Ideally with any modified engine you should find someone who regraphs distributors, and has an engine dyno. You would be surpised about the performance  improvement with a correctly set up car.

And I wholeheartedly agree with Leon (FCCOOL) when he says to get a hold of an electronic dizzy off a blue motor. One thing you need is consistant spark at high revs - and you ain't gunna get it with single points and a standard coil. But from my experience 1.2 mm is too much gap, unless you have some serious coil/dizzy setup. At high revs you will get misfiring.

Good Luck and let us know how it goes!!!!

Cheers,

Craig.

Dave set the spark plug gaps at 035" and each set of points at 018"exact. Take your time adjusting the points make sure they are the same gap. Try setting the timing at 8 degs if abit sluggish then try 10 degs.Take vaccum hose off disy while adjusting timing.

  Cheers Al

Thanks Al,

Very much appreciated  ;D

Dave

Great advise guys but since i posted this and brought new plugs i decided to have a look under the dizzy cap to find what sort of points i needed and guess what? no points! so i guess i have an electronic dizzy . i dont know what ive got performance wise in the motor,  the guy i brought it off said  it was a 186 and thats all he knew about it.
                                       Cheers Rusty