Club G40 Forum
Technical => Engine and Transmission => Topic started by: ereeiz on May 01, 2018, 02:28:23 pm
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I was looking about for a cheap Haynes manual, ended up on their site and noticed as I was browsing through the examples of the content in the manual that it states to use a bosch WR 56 plug for a PY (G40) engine. Anyone ever heard of this before?
Is that a new plug?
I can't remember the ins and outs of plug codes.
The reason I ask is they're £3.50 each. A damn site cheaper than W5DPO's at about £15 each!
*edit* I've emailed Bosch enquiring about this. I'll update when they reply.
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Spent a bit longer looking about on various Bosch sites and came across a list of everything they make for a G40;
http://www.bosch-automotive-catalog.com/en/internet/ECAT-RS/vehicle-info/-/vehicle/equip/VWW/986/as2p4bulrf591csfrpeec32hr1ujjpna
Long story short, it states W5DPO;
Spark plug, Double platinum (W 5 DP 0) 0,70 mm Electrode gap 0 241 247 500
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Bosch W5DPO spark plug specifications;
Type formula Spark plug, Double platinum
Thread diameter 14 mm
Center electrode core material NiY+Cu+Pt
Electrode gap 0,60 mm
Interfer. supp./burn-off res. 0 kOhm
Spark position 3 mm
Search number (KSN) W5DP0
Marketing number W5DP0
Type formula W 5 DP 0
Ground electrode material NiY+Pt
Type formula (old) W 235 P 21
Tightening angle 90 °
Centre electrode 0,8 mm
Thread pitch 1,25 mm
Thread length 19,0 mm
Production discontinuation -
Number of ground electrodes 1
Sealing seat flat-mouldable
Center electrode material Pt
Type of connection DIN/SAE nut included
Independent aftermarket part (IAM) 0241247500
Designation Spark plug, Double platinum
Width across flats 20,8 mm
Tightening torque 28 Nm
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Bosch WR56 Spark plug specifications;
Type formula Spark-plug set, Super 4
Thread diameter 14 mm
Center electrode core material CrNi+Cu
Electrode gap 0,90 mm
Interfer. supp./burn-off res. 6 kOhm
Spark position 4 mm
Search number (KSN) 507
Marketing number 507
Type formula WR 56
Ground electrode material CrNi
Tightening angle 90 °
Article status Discontinued item
Centre electrode 2,4 mm
Thread pitch 1,25 mm
Thread length 19,0 mm
Production discontinuation 10/2017
Number of ground electrodes 4
Sealing seat flat-mouldable
Center electrode material CrNi
Type of connection Detachable DIN/SAE nut
Independent aftermarket part (IAM) 0242242802
Designation Spark-plug set, Super 4
Width across flats 20,8 mm
Tightening torque 28 Nm
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I have tried WR56
they didn't work at all
lots of missfires
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Boooooo. I was hoping it was going to be a new source of cheap plugs.
thanks for letting me know, I'll inform them when they reply!
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my haynes manual have the champion N6BYC spark plug
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most people use ngk due their affordability
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I thought nothing worked except W5DPO's due to....... whatever bit of witchcraft it is that only makes W5DPO's work?
Could you tell me which specific NGK plug works please Pete?
Anyone else with working plugs feel free to pipe up with what has worked for you too!
Thanks.
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ngk bpr7eix is the w5dpo equiv.
some people run w4dpo which are slightly colder, if you are running higher boost.
Never had any issues with ngk's. When I melted a piston I was running w5's but wasn't running meth injection which is probably why I detted the engine
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this haynes manual states Champion NGBYC of which I can't find on the net.
http://www.volkspage.net/technik/manuaisecatalogos/02/haynesrepairmanual_polo86c90to94.pdf
Looking at the spec differences between W5DPO's and WR56, I'm not surprised it made a PY run like a bag of shite