Need help with the spark plugs FD 1999

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Feb 1, 2018 | 11:45 AM

sergejcik

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Joined: May 2016

Posts: 33

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From: mason, ohio

Need help with the spark plugs FD 1999

hi
i do have streetported 13b engine, 550cc 1300cc injectors , power fc, 450lph walbro, full 3 sport cat exhaust, 99 spec twins, intakes
please help me to choose correct spark plugs
i been offered :
1- all 4 9 heat
2 - 2 9 and 2 10
3- all 4 10
4 -2 10 and 2 10.5

please help me out here

Feb 1, 2018 | 08:41 PM

newtgomez

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Joined: Aug 2015

Posts: 323

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From: Eugene, Oregon

It really depends on how much boost you're running but 2 7s and 2 9s should be fine. If not, the option for 4 9s would work too but you shouldn't need that unless you have high boost or a big single.

Feb 2, 2018 | 10:12 AM

Sgtblue

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From: Mid-west

^Agree. If stock boost level, stock heat-ranges leading and trailing. Otherwise you tend to have a lumpy idle on cold start and they’ll probable foul quicker. If you’re running beyond stock boost (10psi) then all 9’s. You shouldn’t need anything colder with those mods, because you shouldn’t be running more than about 12 or 13psi on the twins....though I’m not sure what a “full 3 sport cat exhaust” is.