UR5 or UR6?

92 Ty 1173

92 Ty 1173

Active member
30 over, 2.02/1. L-35's, 422 cam, 20g. A mechanic friend recommended going ur6 and tighten the gap to .030. Thoughts?? Recommendations? I've read the explanation of heat #'s but still confused. Thanks.
 
0966Sy

0966Sy

Code what?
92 Ty 1173 said:
30 over, 2.02/1. L-35's, 422 cam, 20g. A mechanic friend recommended going ur6 and tighten the gap to .030. Thoughts?? Recommendations? I've read the explanation of heat #'s but still confused. Thanks.
Click to expand...


Are you spraying alky? What boost #'s do you run? I moved down to .030 gap from .035 when I started running 18-20psi. I've used the UR6's, they are not as easy to find in stock as the UR5's. If your running pump gas and over 18psi I'd recommend trying the UR6's gapped at least .030. Depending on your results at .035 with 18-20psi it could help. It eliminated some ignition breakup I was having at 18-20psi by going to UR6 at .030. I'm currently at .028 on UR5's with same results. Make sure your wires are in good shape before making changes
 
92 Ty 1173

92 Ty 1173

Active member
Re: UR5 or UR6?

0966Sy said:
Are you spraying alky? What boost #'s do you run? I moved down to .030 gap from .035 when I started running 18-20psi. I've used the UR6's, they are not as easy to find in stock as the UR5's. If your running pump gas and over 18psi I'd recommend trying the UR6's gapped at least .030. Depending on your results at .035 with 18-20psi it could help. It eliminated some ignition breakup I was having at 18-20psi by going to UR6 at .030. I'm currently at .028 on UR5's with same results. Make sure your wires are in good shape before making changes
Click to expand...


18-20 psi will be my street setting. No alky now bur I have it and hopefully get it in this winter. Wires are good. Both wires and plugs were new. Replaced two of them with old plugs and realized I had a bad plug. Thanks for the info.
 
Don W.

Don W.

Stab it and steer it
Re: UR5 or UR6?

Here it's Autolite Racing AR93 @ .028 FWIW, the few folks that I've talked to at tracks all run Autolite.
 
sytyguy

sytyguy

Moderated User
Re: UR5 or UR6?

If anyone is interested in the AR93 plugs, I sell them for $3 each ($18 set of six + S&H).
 
atkonkler

atkonkler

Is this your bush?
Re: UR5 or UR6?

Which iridium plugs and what gap do you run? Cloneman...do they run hotter or colder than stock or ur5 or ur6? I think the ur6 is colder than a ur5...but I'm not sure so don't quote me on that...I've never heard of that's ar93...what's the advantage?
 
SY2455

SY2455

70's Veteran
Re: UR5 or UR6?

The UR6IX Iridium is a colder plug then the UR5IX. The normal UR6 is colder plug than the UR5 plug.
 
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