What octane fuel to run.

[2007R]

I purchased a Wiseco 13:5:1 piston and am wondering what fuel i should be running with this piston my motor is stock besides this piston and a stage II hotcam. Would a half and half mix of 110 and 91 work? I cant run just staight 91 can I?

[chronicsmoke]

I wouldnt run 91.. not even if youre stuck..

I have a 13:1 piston and I'm running 94/VP110 mixed 50/50 and it runs good. I could probably run a leaner mixture of say 70/30 but for the little bit of extra assurance, I'll stick with 50/50

[Balaz_73*00]

AV100LL

[fastredrider44]

I run 50/50 93/110 with that same compression.

[99_300ex]

I've got a 14 to 1 piston and a cam and have been running straight vp112 could I do 50/50 of 92 and 112?

[airmobile101]

Originally posted by fastredrider44
I run 50/50 93/110 with that same compression.
Same here with no issues.

[evild911]

i run a 97mm big bore with 10:1 pistion and a hrc cam and i run pure sunoco 110 in it and it rips

[chronicsmoke]

Originally posted by evild911
i run a 97mm big bore with 10:1 pistion and a hrc cam and i run pure sunoco 110 in it and it rips

Would that be using the true potential of the 110?
with 10:1 I thought you'd be able to run premium pump fuel? (not calling you out, just wondering haha)

[440ex. ehhh!!]

you can run pump gas up to 12...12.5:1 compression. some say 13:1. but you for sure do not need 110 octane at 10:1, your probably doing more bad then good.

[BlaineKaiser450]

For your 13.5:1 you would be fine with a mix of pump and 110, when I had 13:1 I ran 104 and when I had 14:1 I ran 110