#1  
Old 05-28-2020, 12:51 PM
TransAm 474's Avatar
TransAm 474 TransAm 474 is offline
Chief Ponti-yacker
 
Join Date: Jun 2004
Location: Cape Fair,Mo
Posts: 683
Default NGK Plug

Good day everyone... Does anyone know if a NGK Spark Plug exists that is the same as the NGK R5673-8, but in a Resistor plug? They are for 6X heads, and need to be 5/8" wrench, .460" reach, tapered seat, perferably "Non-Projected" tip. The engine is a 461 with a single SXE480 billet turbo making maybe 800+hp with 10-15 lbs of boost. 100% street car on pump gas. I will be running the Holley XFlow 1375 EFI, and it recommends "Resistor" plugs to keep RFI problems in check. I think the heat range of the R5673-8 would work great for me, but I need it to be a "Resistor" plug. Anybody have a recommendation for a part number? Thank You

__________________
1978 Trans Am
Pump Gas 461 Stroker

Last edited by TransAm 474; 05-28-2020 at 01:16 PM.
  #2  
Old 05-28-2020, 01:00 PM
Scott65's Avatar
Scott65 Scott65 is offline
Ultimate Warrior
 
Join Date: Jan 2002
Location: Houston, Texas
Posts: 1,486
Default

Subscribed, cause I'm having trouble finding non projected tip, resistor NGK's as well. Different application though... Hope you find what your looking for.
https://www.sparkplugs.com/Data/uplo...ug_Chart_1.jpg
This will help, but I'm not sure you'll find non projected tip...

__________________
'65 Tempest 467 3650# 11.30@120.31
  #3  
Old 05-28-2020, 02:33 PM
TransAm 474's Avatar
TransAm 474 TransAm 474 is offline
Chief Ponti-yacker
 
Join Date: Jun 2004
Location: Cape Fair,Mo
Posts: 683
Default

Quote:
Originally Posted by Scott65 View Post
Subscribed, cause I'm having trouble finding non projected tip, resistor NGK's as well. Different application though... Hope you find what your looking for.
https://www.sparkplugs.com/Data/uplo...ug_Chart_1.jpg
This will help, but I'm not sure you'll find non projected tip...
Thank You. I'm actually starting to lean more towards a "projected tip" plug for this application, since it is street driven. I have came to that conclusion after reading a comment over on one of the turbo forums, where a NGK Tech had responded and explained that, even with boost, it is better to run the projected tip in a street application, since it keeps the tip of the plug burned cleaner, keeping it from fouling. The coldest "Resistor" plug I can come up with in the NGK, with a tapered seat, .460" reach, 5/8" wrench is the NGK UR6(7773 Stock Number)plugs. The NGK Tech says it is 2 steps colder than stock Heat range, so that should work for me. I have since read quite a few people using them with great results in Street boosted applications as well. Anyone see any problems with the UR6 plug in this application?

__________________
1978 Trans Am
Pump Gas 461 Stroker
  #4  
Old 05-28-2020, 03:27 PM
Scott65's Avatar
Scott65 Scott65 is offline
Ultimate Warrior
 
Join Date: Jan 2002
Location: Houston, Texas
Posts: 1,486
Default

I guess NGK tech is saying a "4" heat range would've been stock? I run a "6" heat range (BKR6E, for an edelbrock head) normally aspirated. And I don't disagree with the projected tip for normal driving. Mine are as well. But I was hoping to find a non to try as well. Same deal as you, electronics that won't tolerate noise.

__________________
'65 Tempest 467 3650# 11.30@120.31
The Following User Says Thank You to Scott65 For This Useful Post:
  #5  
Old 05-28-2020, 07:05 PM
Larry Navarro's Avatar
Larry Navarro Larry Navarro is offline
Ultimate Warrior
 
Join Date: Dec 1999
Location: Spring(Houston) Tx. USA
Posts: 6,366
Default

I use the extended or projected electrode in all my 2-stroke MX bikes since the '70's. High revving 2-strokes are brutal on plugs.
The electrode actually runs cooler as it is the the direct path of the air/fuel mixture, as opposed to the "shrouded" (regular) electrode.
Another advantage is more efficient burn with the electrode extended further in the combustion chamber.

__________________
Home of WFO Hyperformance Shaker induction.
The Following User Says Thank You to Larry Navarro For This Useful Post:
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:39 PM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 

Cold Case Radiators

Cold Case Radiators is a Max Performance company that produces high end aluminum performance radiators at a price point that won't break the bank. Polished and stamped tanks. 2 rows of 1" tubes. Lifetime Warranty.

GTOG8TA.com

GTOG8TA.com is a Max Performance company that manufacturers parts for the 04-06 GTO, 08-09 G8, and 93-02 Firebird/Trans Am platforms.

Copyright © 2017