CVH plug gap???

[Sylvaforever]

1600cc CVH heavily worked head twin 40's cvh 23 plug gag??

I'm struggling to find references for modified engines.

Carbs set up for maximum output [MOT unfriendly lol] running a homebrew concoction of shell nitro and tetra boost to 103 Oct leaded...

Some say gap to .8 mm others 1mm.

Due to fuelling I'm tempted for the .8mm but does anyone have any suggestions?

[stevieturbo]

If your ignition system has the power to fire a bigger gap, then use a bigger gap.

[Sylvaforever]

stevieturbo said:

If your ignition system has the power to fire a bigger gap, then use a bigger gap.

Hmm sports coil and wind up system lol, NGK recommend .8 for the single carbed cvh think I'll stick with that unless any one has anyother info.

cheers

[AER]

the issue you're trying to avoid is HV breakdown at high cylinder pressures. This will normally happen around peak torque where VE is at its highest. Try 1.0mm and if it's not misfiring at WOT through the rev range, you're good to go.

[Sardonicus]

Stock gap on the CVH IRRC was 30/32 thou/imperial or 0.8 mm new money and NGK are generally pre-gapped for the application these specs should work fine on your breathed on motor too