CLASS RACER FORUM - View Single Post

Adger Smith · 05-18-2007, 12:26 AM

Steve,
Mark Kidd sees the same HP improvement I have seen in High compression engines. That could be due to VP reformulating the C-12 a couple of years ago. It seems to work better in higher compression engines now. I would assume there is little difference in low compression engines. Lower compression engines might even do better with the lower octane fuel.
In testing I have expereienced a 26 Hp difference in VP C-14 & Sunoco Maximal in the Splayed Valve V-6 I run. This V-6 engine is a very high RPM & high compression engine. It just likes the VP C-14, but makes even more power on VP C-25. Just try the fuel & see if it works for your combination. Each engine & engien combination could be different. I guess that is why VP lists over 50 different fuel mixtures.

Adger Smith

05-18-2007, 12:26 AM	#14
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Steve, Mark Kidd sees the same HP improvement I have seen in High compression engines. That could be due to VP reformulating the C-12 a couple of years ago. It seems to work better in higher compression engines now. I would assume there is little difference in low compression engines. Lower compression engines might even do better with the lower octane fuel. In testing I have expereienced a 26 Hp difference in VP C-14 & Sunoco Maximal in the Splayed Valve V-6 I run. This V-6 engine is a very high RPM & high compression engine. It just likes the VP C-14, but makes even more power on VP C-25. Just try the fuel & see if it works for your combination. Each engine & engien combination could be different. I guess that is why VP lists over 50 different fuel mixtures. Adger Smith __________________ Adger Smith (Former SS)