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Spark plug recommendation needed 3.0 euro with Webers
I have a 3.0 euro motor that was converted to webers. No changes to the engine except it is running straight headers with no muffler.
What plug should I run? The plugs that are in it now are Bosch Platinum WR5DP. Anyone run this combo. Thanks Greg
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www.uniquemotorcars.net 68 911, 73 911E, 77 930, 77 911S, 94 968, 69 GT500 convert., 66 Shelby GT350H, 65 R-model replica. |
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05-23-2009, 07:36 PM
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Location: Portland Oregon
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Hi Greg,
Without knowing how you are using the car, its tough to offer specific spark plug heat range recommendations.  WR5's are fine for all around use, but a bit too warm for racing. FWIW, you are giving up a substantial amount of low & mid-range torque without a muffler that doesn't provide a payback at higher RPM power due to your mild cams.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com Last edited by Steve@Rennsport; 05-24-2009 at 12:08 AM.. |
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05-23-2009, 07:45 PM
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I very well could be giving up the low and midrange as you mention.
Eventually I would like to make this into a DE car. The chassis is a 77 that I purchased without a motor and trans. Found a motor and trans on this site and now have it installed. Just now sorting things out and trying to dial in the webers. The pipes I have on the car now come out in the center and I just did this as it was a quick way to do the exhaust. Greg  
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www.uniquemotorcars.net 68 911, 73 911E, 77 930, 77 911S, 94 968, 69 GT500 convert., 66 Shelby GT350H, 65 R-model replica. |
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05-23-2009, 08:01 PM
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Wer bremst verliert
Join Date: Jan 2005
Location: Toronto, Ontario
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I use bpr6r's in my 3.0 with webers
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2007 911 Turbo - Not a toy 1985 911 Cab - Wife's toy 1982 911 3.2 Indiash Rot Track Supercharged track toy 1978 911 3.0 Lichtbau toy "Gretchen" 1971 911 Targa S backroad toy |
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05-23-2009, 11:26 PM
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My god that thing must be loud, you don't run this on the street do you?
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72 911 Although it is done at the moment, it will never be finished. |
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05-24-2009, 04:39 AM
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It is loud but not as bad as my 65 GT350R which has a 331ci, 450hp adn straight pipes. I drive both on the street and have never been pulled over.
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05-24-2009, 06:57 AM
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When I lived in Mill Valley, a guy down the street has almost this same car, same color scheme, etc.. He races it all over the place and it is frickn loud when he fires it up.
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72 911 Although it is done at the moment, it will never be finished. |
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05-24-2009, 07:26 AM
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Yes it is loud. Actually much louder in the car since I have the original R style interior, no headliner, metal door panels etc.... Much fun. I currently do DE with the Nordstern porsche club. Need to get a P car for DE that is why I got the 77 911S with the 3.0 euro.
Greg 
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05-24-2009, 07:35 AM
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Steve,
What heat range would you recommend. I am a bit confused in looking at the spark plug cross referrence guides. The heat ranges vary with brand for the plugs recommended in the cross reference. Bosch wr5dp heat range 6 Auto lite ap63 heat range 3 NGK 2023 (bpr7es) heat range 7 Greg
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05-24-2009, 07:50 AM
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Greg,
I'm not a fan of Yankee plugs in these machines so I only use Bosch or NGK's,... Bosch heat range values get hotter as the numbers go higher; NGK's go colder as the numbers get higher. The WR5DP is a "5" heat range and roughly equivalent to an NGK 7,..its not a one-to-one precise conversion. I would recommend using hotter plugs to initially get the carbs set up (idle & acceleration), then put in the plugs you will use for the final (main & A/C) jetting. Remember, your muffler setup has a big effect on jetting and I'd kindly suggest you review what you are currently using before undertaking the final jetting corrections.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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05-24-2009, 10:58 AM
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Steve,
What heat range would you suggest for doing the tuning. Would you go hotter than the WR5DP? Thanks Greg
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05-25-2009, 05:50 AM
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Tobluforu
