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Index > Engine/Drivetrain > Thread: Sparkplugs?
Thread: Sparkplugs?
mwpayne


Hauling
Posts: 195
posted April 25, 2005 03:12 PM

Sparkplugs?

My new 74 REPU has the engine pretty much all stock, so I'm curious as to whic spark plugs are best. I've has several RX-7's and know the NGK's to use for those, are those BUREQ7's and 9's ok for the truck? It had two different type of champions it it, they had two electrodes.

       
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bliffle


Revvin Up
Posts: 95
posted April 25, 2005 03:59 PM

If you have the old points-type distributor you need plugs with a .025 to .050 gap, while electronic ignition uses a gap of .050 to .060, which is the factory gap for BR7EQxx plugs. As I recollect, my 74, which still has the old points sytem (I promise to upgrade this summer - I have the parts!), has something like "BR4" plugs installed. (Maybe that "E" means 'electronic').

All these multi-electrode plugs are perma-gapped, so it's important.

Beware of plugs that are too long: they can clip the apex seals and blow your engine.

B

       
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bliffle


Revvin Up
Posts: 95
posted April 25, 2005 09:03 PM

Oops! Sorry about the typo: that's .025 to .030 for points and .050 to .060 for electronic. I can attest that the wide-gap plugs don't work good in the points system!

B

       
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klaus42


Rotorhead
Posts: 1877
posted April 26, 2005 09:28 AM

You're looking to run...

...the old '4-sidewire' plugs, ideally... I seem to recall designations such as BR 8EQ 14 ...

For your application, the four sidewrires beat the three or two-sidewire models --like the 'ET' series-- , because so much depends on the final position of the plug in the combustion zone.

       
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Brad


Rotorhead
Posts: 1672
posted April 26, 2005 10:23 AM

NGK BR8EQ-14

are just fine. 4 ground electrodes, pre-gapped. plug and play.
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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