BulldogDriver Posted May 3, 2021 Share Posted May 3, 2021 Never saw them referenced as 4036, only 4236 till your post. Shame they are history now. Ray Link to comment Share on other sites More sharing options...
awk409ak Posted May 3, 2021 Share Posted May 3, 2021 Ok. Well did speak with a Bosch tech by phone and he had NO listing for 4236. He could not tell me a thing about the 4236. He did have the listing for 4036 that had been discontinued in 2016. So anyone know what the difference is? Art Link to comment Share on other sites More sharing options...
BulldogDriver Posted May 3, 2021 Share Posted May 3, 2021 if you need to see it on a Bosch box https://www.ebay.com/itm/174750104331?epid=78861461&hash=item28afeafb0b:g:r~AAAOSwzzdgifBj 1 Link to comment Share on other sites More sharing options...
RivNut Posted May 4, 2021 Share Posted May 4, 2021 I opened one of the four boxes of four I got today and took out a plug. On the plug itself is the stamped WR9FP. No mention of a part #. 4236 is only on the box. Link to comment Share on other sites More sharing options...
awk409ak Posted May 4, 2021 Share Posted May 4, 2021 Question, the 4036 is a WR9FP+, the 4236 is WR9FP. What does the + mean, anyone know. Art Link to comment Share on other sites More sharing options...
telriv Posted May 4, 2021 Share Posted May 4, 2021 Those numbers are stocking numbers. I've never noted a + on any of the plugs I've installed. Then again I wasn't aware of that. Only the number on the plug of: WR9FP. 1 Link to comment Share on other sites More sharing options...
XframeFX Posted May 5, 2021 Share Posted May 5, 2021 Searching here in Canada, I found 4 of these plugs at a motorcycle shop in Quebec City but didn't purchase because another 4 are unobtainum and have been for quite some time. Like trying to find a 12" Switch Pitch Torque Converter here in 2021! From Bosch: 1 Link to comment Share on other sites More sharing options...
awk409ak Posted May 5, 2021 Share Posted May 5, 2021 Thanks John, Found another chart that is easier to read. It may not interest everyone, but here is what it all means So a WR9FP (4236) is W=14mm x 1.25mm, hex is 21, R= Resistor plug, 9 heat range (06 to13) 13 being hottest, F= 9.5 thread length, P= platinum, and WR9FP+ (4036) is the same as above except the + which means Super plus technology. Per Bosch, the 4036 was identified as Bosch 4036 WR9FP+ Platinum Plus Spark Plug So they are the same except the +, and we may never know what the Super Plus Technology is. Art Link to comment Share on other sites More sharing options...
arnulfo de l.a. Posted May 8, 2021 Share Posted May 8, 2021 Do these bosch plugs ( WR9FP ) come pre gapped from factory? Tom T mentions .050 in his post. Does that apply to electronic ignition also? Link to comment Share on other sites More sharing options...
telriv Posted May 8, 2021 Share Posted May 8, 2021 Normally as packaged they are between .038" or so to .041" as packaged. I set most to .050". That is IF you have GOOD plug wires & NONE of the date coded repro junk. You must be careful when setting the gap. Don't drag the gapper across the tip, middle of the plug as the platinum on the tip is very thin. Use a gapping tool is the best way. The nice thing about them is as you open the gap they don't get cockeyed. Tom T. Link to comment Share on other sites More sharing options...
arnulfo de l.a. Posted May 9, 2021 Share Posted May 9, 2021 Thanks for the info Tom Link to comment Share on other sites More sharing options...
Riviera63 Posted May 13, 2021 Share Posted May 13, 2021 The 4236 Bosch plugs are still available from Rock Auto for $0.88 each. I ordered 16 last week and got them today. Bill 1 1 Link to comment Share on other sites More sharing options...
XframeFX Posted January 4 Share Posted January 4 Today, January 4th, 2024 RockAuto close-out: 8 Remaining @ $2.05 ea. Get 'em before the Bikers do! https://www.rockauto.com/en/moreinfo.php?pk=272206&cc=1319330&pt=7212&jsn=137 Link to comment Share on other sites More sharing options...
RIVNIK Posted January 4 Author Share Posted January 4 I enjoyed going back & reading this thread. A person did ask what some of you thought was a really stupid question, I must admit. Then(as at other times), someone feels like they have to say sorry, we don't have time to answer your silly question, why don't you perform a search and leave us alone. Others even chime in with the same nonsense. They could have spent less time just answering the question with 3 or4 numerals and possibly a letter, or just not say anything. Notice what followed. A two page, in depth, technical discussion on everything one would want to know about spark plugs. Thanks to everyone who took the time to turn a piece crap question into a meaningful dialog. Including the people who didn't want to answer, then chose to wow us with their vast arcane knowledge of spark plug facts. just sayin' Link to comment Share on other sites More sharing options...
OldGerman Posted January 4 Share Posted January 4 Bosch WR9FP also no longer available here in Bosch Town Stuttgart Germany. Found this replacement table, but No gurantee for correctness. 1 Link to comment Share on other sites More sharing options...
XframeFX Posted January 4 Share Posted January 4 2 hours ago, OldGerman said: Bosch WR9FP also no longer available here in Bosch Town Stuttgart Germany. I chased around for this sparkplug and good ole Rockauto was it! 1 Link to comment Share on other sites More sharing options...
XframeFX Posted January 5 Share Posted January 5 5 hours ago, OldGerman said: Bosch WR9FP also no longer available here in Bosch Town Stuttgart Germany Frank, you're our inside man! Tom T's experience has identified the Bosch WR9Fp as THE Sparkplug of choice. So, if you're on the doorsteps of Stuttgart, perhaps you could knock on the doors at Bosch HQ and demand the return of this sparkplug, LOL😆 Also, we need an inside connection for pancake air filter elements! Link to comment Share on other sites More sharing options...
OldGerman Posted February 2 Share Posted February 2 On 1/5/2024 at 2:04 AM, XframeFX said: Frank, you're our inside man! Tom T's experience has identified the Bosch WR9Fp as THE Sparkplug of choice. So, if you're on the doorsteps of Stuttgart, perhaps you could knock on the doors at Bosch HQ and demand the return of this sparkplug, LOL😆 Also, we need an inside connection for pancake air filter elements! Germany’s politicians and EU parliament decided to prohibid Sales of new vehicles with combustion engines in 2035. So Bosch, Mann-Hummel, Mahle, and all the other old german automotive suppliers have to drive the change towards electric automobiles to avoid bankruptcy. Who cares about a 3years only 60 years old pancake Filter ? It‘s totally absurdity that electric car sales numbers are so low in Germany due to lack of charging infrastructure and way overpriced 3 tons E-SUV‘s built by BMW , Mercedes, Volvo.... chinese brands are filling in with small and medium size cars now. this premium car sale strategy could be a fail...... to stop development of high efficient and clean Diesel and gasoline engines is a big fail as well. Just my opinion. How is it related to pancake filters ? there is no business case for it. Just have to find that one forgotten storage full of NOS WR9FP Spark Plugs. Just a dream. Link to comment Share on other sites More sharing options...
XframeFX Posted February 2 Share Posted February 2 1 hour ago, OldGerman said: How is it related to pancake filters ? there is no business case for it. Just have to find that one forgotten storage full of NOS WR9FP Spark Plugs. Just a dream. Sparkplugs have been found and at clearance prices. Not so for that air cleaner element I'm afraid and never will. Again, thought K&N would've support us. Link to comment Share on other sites More sharing options...
NTX5467 Posted February 3 Share Posted February 3 Might the normal platinum plugs ("P") be the "single platinum" version and the other ("P+") be the "double platinum" variation? Single platinum means the ground electrode has the thin plate of platinum fused/welded to it. Double platinum has the plates fused to both the center electrode and the ground electrode. Yes, care must be used with gapping them. If you don't like the .050" gap, decrease it to .040" or .045" gap. Just some suspicions and thoughts, NTX5467 Link to comment Share on other sites More sharing options...
Wayne R Posted February 6 Share Posted February 6 Just want to back up , re Tom t, recommends Bosch spark plugs, reason why i know is , i owned five Porsche 911 , models 1969 to 1984 mostly when i lived in California years , and all i used Bosch spark plugs,---any Porsche owner will say the same. But i have just stuck with A/C in my Buicks,. Pelican Parts in CA are a good source for Bosch plugs, but probably not cheap these days. Link to comment Share on other sites More sharing options...
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