Quick Spark plug question

[JPSmit]

Jeff Schlemmer says NGK BP6ES on his website

ON the NGK website, it says BPR5ES for MG Midget

thoughts?

please answer ASAP as I want to go the part store

thanks all!

 

[JPSmit]

never mind - just found a post where Hap confirms Jeff, thanks all.

 

[recordsj]

any idea on why the discrepancy?

 

[Spridget64SC]

Could be Compression ratio differences. Early 1275s (8.8) used the Champion N9Ys while later ones (8.0) used the N12Ys. N12's are colder than N9's. Probably the same arrangement for the 1500s. A while back, I made recommendations for spark plug heat ranges based upon compression ratio. From a NGK part number perspective, I started with the BP6ES and worked up to the BP9ES (actually going colder) based upon compression ratios from 8.0 to 1 to 14.0 to 1.

8/9 to 1 gets 6's
10/11 to 1 gets 7's
12 gets 8's
13 to 14.5 gets 9's
14.5 and above get's 10's (Note: Usually BP10EV's [Exotic metals & Fine Wire] are usually used at this high of a compression ratio)

Colder plugs justs means that the burn heat is "wicked" away quicker by the spark plug metal construction. Usually means less ceramic insulator.

Also, the sparkplug design changes depending upon application BP are "projected nose" plugs. B is regular nose. BPR would be a projected nose resistor plug.

Run as "warm" a plug as you can safely accomodate. Start colder and work hotter. This is the conservative approach and avoids bad things happening. Warmer plugs are good for stop and go driving, while colder plugs are better to highway type crusing and sport applications.

HTH
Mike Miller

 

[Spridget64SC]

OOPs, Got my colder mixed up in the Champion statement. N12Ys are "HOTTER" than the N9Y's. Mea Culpa!!!!!!!!

 

[sswarin]

Hello JP and others,

I have a tough time finding NGK plugs in the Detroit area. Does Canadian Tire carry them? If so, the next time I make the trip across the river, I'll pick some up.

Thanks.

Steve

 

[Jer]

Hello JP and others,

I have a tough time finding NGK plugs in the Detroit area. Does Canadian Tire carry them? If so, the next time I make the trip across the river, I'll pick some up.

Thanks.

Steve

www.rockauto.com

$1.61 each, just enter the BP6ES part # & NGK as manufacturer in the search.

Have had good success with this company, only a couple dealings but so far so good.

 

[JPSmit]

Hello JP and others,

I have a tough time finding NGK plugs in the Detroit area. Does Canadian Tire carry them? If so, the next time I make the trip across the river, I'll pick some up.

Thanks.

Steve

I got them from Partsource - and they had to order them, not sure about Canadian Tire - except to say that generally their automotive section is getting smaller. Certainly paid more than Rockauto quoted.

 

[sswarin]

Thanks Jer and JP...I have added Rock Auto to my favorites.

Steve

 

[Billm]

I use both Rockauto.com and Drivewire.com - if one doesn't have then the other usually will and they are both really great to work with and FAST delivery!
BillM

 

[Pythias]

I just drive down to NAPA and pick up a set.