plugs and gap on tuned 4.3

[chrisdurham]

Hi guys just looking for Some info on the most suitable plugs and gapping for a tuned 4.3. It has an msd ign system and higher comp ratio with a Webber Carb
cheers
Chris

[Sardonicus]

chrisdurham said:

Hi guys just looking for Some info on the most suitable plugs and gapping for a tuned 4.3. It has an msd ign system and higher comp ratio with a Webber Carb
cheers
Chris

I would stick with the NGK B7ECS plugs gapped at 30/35 thou and possibly up to 40 thou 1.1mm

Edited by Sardonicus on Wednesday 9th January 17:56

[ChimpofDarkness]

Or have a read here:

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Others are using the NGK BPR6EIX iridium plugs I fitted to great effect, & are also enjoying similar benefits.

[Sardonicus]

A tuned 4.3 (unknown spec) I would approach with caution hence why I said stick with the 7's better too cool than to hot plug wise

[chrisdurham]

hello guys some interesting reading
Ok here is some more into on spec which I think will effect the responses I get

4.3 litre Rover V8 engine,
approximately 280bhp
High compression pistons 10.5:1
Lightened and balanced bottom end
Lightened 5L TVR flywheel
AP competition clutch
Crower Cam and timing gear
Hi rev anti pump lifters
Stage 3 heads with balanced combustion chambers, 5 angle valve seats, shortened and tapered guides and enlarged throats.
Oil system modified with tadpole pressure relief valve
Baffled trapdoor sump
Remote oil filter
MSD Ignition
Omex Rev limiter
Webber 500 4 barrel carb
Custom Exhaust - 4 into 1 Headers with 1 ¾” dia long primarys, 2 ¼” system, Repackable Stainless Silencers.

[ChimpofDarkness]

chrisdurham said:

hello guys some interesting reading
Ok here is some more into on spec which I think will effect the responses I get

4.3 litre Rover V8 engine,
approximately 280bhp
High compression pistons 10.5:1
Lightened and balanced bottom end
Lightened 5L TVR flywheel
AP competition clutch
Crower Cam and timing gear
Hi rev anti pump lifters
Stage 3 heads with balanced combustion chambers, 5 angle valve seats, shortened and tapered guides and enlarged throats.
Oil system modified with tadpole pressure relief valve
Baffled trapdoor sump
Remote oil filter
MSD Ignition
Omex Rev limiter
Webber 500 4 barrel carb
Custom Exhaust - 4 into 1 Headers with 1 ¾” dia long primarys, 2 ¼” system, Repackable Stainless Silencers.

As Simon says, you're probably better off with the 7's given the above spec.

Use the TVR shrouded type if you like but I still think a projected type would give benefits, just select a 7 not a 6.

[chrisdurham]

Thanks ill try and find out what is in it at the mo
they look very old
but im Sure They are protruding

[chrisdurham]

ok guy, got one of the plugs out -

its a Bosch Super Plus WR7DC+

Anyone know of these?

[Sardonicus]

chrisdurham said:

ok guy, got one of the plugs out -

its a Bosch Super Plus WR7DC+

Anyone know of these?

Bin em Bosch plugs