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Posted: Wed Sep 26, 12 11:53 am
by Pete
I do not rate Champions (Others will disagree...) I had loads fail in road going motors - both electrical and mechanical - I switched to NGK's and have never had a failure....
Posted: Wed Sep 26, 12 12:28 pm
by Les Szabo
I used BP7ES on iron headed 440 at around 10.2:1 with big cam...race only, found these worked slightly better over 6's with a lot of fuel going in on my set up, never had a problem whether on mtr or on 175hp squirt.
Used 6's on the 340ci with 250hp squirt..not a sign of a tipped plug ..perfect.
If your running an MSD 6 or 7, don't go massive on plug gaps as some will suggest, keep it down to around .30 thou.
Les
Posted: Wed Sep 26, 12 2:18 pm
by AllKiller
Les, Why do the suggest such huge gaps...i think my compression was blowing them out with a 50+ thou gap as suggested ????
I went back to 30 and no probs
Posted: Wed Sep 26, 12 3:00 pm
by Les Szabo
I think its was mostly just advertising splurge Steve, remember pictures of a big massive spark on the ad.....theory being that a big longer duration spark will ignite your mixture better, not technically incorrect...but not quite reality as we know in all applications
Les
Posted: Wed Sep 26, 12 5:17 pm
by mopar_mark
Bigger gaps are OK if you have the extra Zap to bridge the gap & ignite the fuel.
Same as the rest of motor, they are only guidelines & you need to adjust accordingly to suit your own particular engine . . .
Posted: Wed Sep 26, 12 5:22 pm
by Mick
plug heat range is very important when gapping, i was running too colder plugs and closed the gap fairly tight but now i think the heat range is about right but i still run around .035 with msd.
I use the v power non- projected NGK's, although, i prefer the Autolite equivalent but they are more expensive.
Mick
Posted: Wed Sep 26, 12 6:27 pm
by AllKiller
Indexing the plugs also helps...only you'll probably need more than one set or some plug indexing washers
Posted: Wed Sep 26, 12 7:44 pm
by Les Szabo
An NGK plug has a broader more flexible heat range spread in any one given plug number over most other makes, thats why they work so well straight away and give no problems.
Posted: Wed Sep 26, 12 11:50 pm
by Steve
Les, what NGK plug would you suggest for my stock 383 4bbl (68).... May just try some out of curiosity next service....
Cheers Steve
Posted: Thu Sep 27, 12 10:31 am
by Dave-R
Posted: Thu Sep 27, 12 10:33 am
by Dave-R
It would be XR4 or XR5. Being a stock motor and lower compression I would thing probably the XR4 as the part finder suggests.
Posted: Thu Sep 27, 12 10:50 am
by Steve
Thats great Dave, thanks as always for your advice on this!will try those next service (Spring now)
Cheers Steve
Posted: Thu Sep 27, 12 1:28 pm
by Dave81
As Steve said.......Great page for info!
Posted: Tue May 14, 13 3:52 pm
by db
I'm about to swap to NGKs, my current plugs are Bosch FR8DC0 (360, Indy heads, 10.5:1.)
According to here...
http://www.sparkplug-crossreference.com ... _PN/FR8DC0
...NGK equivalent is BKR5E.
Is that ok or should I go to 6 or 7?
Posted: Tue May 14, 13 4:45 pm
by Pete
5 sounds low...go for 6!