October 8, 2015 at 11:13 pm #9963
Firstly I’m talking about V7ysi blowen Holden 355 stroker
im sure this will lead into LS talk as well witch is fine as they take same plugs I believe but behave slightly different
who has used non resistor pulgs with efi ?? Did it cause any issues ?
Goin to try 8 heat range but seams all are none resistor when goin this cold
Right now iv got BR7EFS in it
goin to try race plugs NGK R5671-a-8 as I want a none projected tip
if you where N/A in a full on race engine and wanted the projected tip I know others using
NGK R5724-8October 9, 2015 at 12:01 am #9966
Im running non-resistor BP7EFS’s in my turbo 355. Yes projected tip. Runs fine with haltech efi, don’t get any radio noise through my stereo or anything like that either.
E85 and 0.8mm gap.October 9, 2015 at 12:10 am #9968
Yeah cool as
there is nothing saying projected tip is right or wrong with boost, lots do it
I have a had projected tips in myn as well and didnt notice any difference at all and worked perfectly well
are you running MSD 8.5mm super conductor leads?
All i have read that where using these and non resistor plugs had no problems at all, couple others have had issues with serial cable while tuning with lap top and eradic idles but not sure what leads they where using, had never heard of the brand before
believe ver some have had coils stuff out as wellOctober 9, 2015 at 7:18 am #9970
Just running the genuine bosch leadsOctober 9, 2015 at 8:05 am #9973
Have you looked at the Autolites Manta?October 9, 2015 at 6:49 pm #10001
No I have never looked at autolites
would have to search there parts to find a 8 heat range, to suit Holden engines and in a non protruding tipOctober 10, 2015 at 6:32 am #10007
I use a non projected 7 for EFI heads. I assume they make colder plugs. They made a fair bit of difference to cold start and idle on E85.October 10, 2015 at 10:19 pm #10014
Iv been looking and it would appear auto light is absolutely f#cked for trying to find a parts list with the relevant info to there plugs to choose a set
Only thing I can do is find a parts reference to find comparable plug to another company’s part number
that’s shit, it gives me the same auto light plug (103) for comparsion of NGK tr6 plugs and br7efs
2 very different plugs, different heat and ones projected and one isn’t
I want to see there list of plugs so I can pick one and after using
them either choose a set hotter or colder depending on the plugs conditionOctober 10, 2015 at 10:52 pm #10015
Ok so still having trouble finding a list of there plugs but am getting there slowly
iv found AR474 witch is in the racing plug section
so thats equilevent to b8efs In NGK terms
so 14mm thread
5/8 hex head
equilvent to 8 heat range in NGK language
and a non projected tip
only thing I go I can find in a 7 heat range comparable is 103
thats got a projected tip though, the ar474 is the hottest of the racing plugs and has 2 colder plugs but I really really doubt I will need any colder then the ar474
problem is 7-8 heat range is where it bounces from resistor to none resistor so they are listed in different sections
what autolite plug part number is it that you are using narva that is resistor, none projected and equilvent to 7 heat range to NGK ratings ?
All i I can find 103
October 11, 2015 at 8:31 am #10017
- This reply was modified 3 years, 5 months ago by vs manta 218.
Initial advice I received was to try:
From Micron Engineering…NGK – R5671A-8
AutoLite – AR3934 (My preference)
Champion – C61CX (My second preference)
These are all around the 8 range. But…. I am just about to put my engine back in after some upgrades and my machiner / engine guy (absolute guru) put a variety of plugs in my heads (Yella Terra -9’s) and told me to ditch the Autolites. They were too short. The electrodes were actually around a 1/4 inch recessed into head, ie not protruding into the chambers. Luckily I was using a 7 amp MSD system which pretty much lights anything.
He suggested (and trial fitted with heads off) a tapered seat plug like NGK BP7EFS. They also come in 8’s. I’m not sure if this is an issue particular to YT or would apply to all EFI heads.
The the initial plug advice was received by another pretty switched on bloke. Not sure if this helps you too much Manta. The above plugs recommended are all EFI plugs, 8 range, non projected and non resistor. I guess you can only try them and look at the plugs after trialsOctober 11, 2015 at 8:33 am #10018
Not sure what’s going on with the above garbage. I can in box if it’s too hard to read or you can buzz meOctober 11, 2015 at 10:36 am #10022
The above happens when logged in on multiple devices
Samsung phone and apple hate each other, if you have short cuts on your home screen on both devices that are already logged in delelte them both then create short cuts that are of the forum that are not logged in, and if you go from one to the other make sure you close the page down
I get it some times
now I know exactly what your talking about and I was wondering the same as Holden heads are ment to be 3/4 inch length but it seams racing plugs from either company don’t come in this and are 0.708 thou witch is about 1.2mm short
i have in ngk in none projected tip the options of
only difference is the 8 is none resistor witch in 8 is normalApril 19, 2016 at 12:15 am #16184
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