VP race fuels

J Kuchel · 04-01-2008, 09:04 PM

I run a BBC that has 9.69 to 1 comp.. I have always used VP C-12 fuel but I don"t need all of the octane so, I was thinking of switching to VP Motorsport 105L fuel. It is suppose to be good to 11 to 1 comp.. It has a motor octane of 101 and a specific gravity of .745 - .760 @ 60 degrees F. Can someone tell me if this is a good choice? I like to stay with VP fuel. It is going to be for a bracket car.

Caperat · 04-01-2008, 09:54 PM

Save your hard earned cash and run the rat on high test pump gas. I've played with the same combo and the blue barrel juice is a waste of money unless you want to run some spray.

greg fulk · 04-02-2008, 02:33 AM

I'd say sunoco ultra 94 would be fine! I ran cam2 in my old bracket car till one day I ran out in the 6th round of elim. all i had was generator gas ...put it in & the car broke out! it was a 9.5 comp. car.

J Kuchel · 04-02-2008, 06:37 AM

Ok does the static comp. and the cranking comp. make that much difference? The static is 9.69 to 1 but it has alot of cranking comp. due to the camshaft profile.

Dave Cook · 04-02-2008, 10:54 AM

Quote:

Originally Posted by J Kuchel

Ok does the static comp. and the cranking comp. make that much difference? The static is 9.69 to 1 but it has alot of cranking comp. due to the camshaft profile.

If you spin it many RPM's, your octane requirement does go up, but I agree, you are probably wasting $$ and performance potential by running more octane than you need. Octane is, in simple terms, the measure of the resistance to ignition....if you are running race fuel in a low compression engine, you have to advance the timing to recover the performance you may get with lower octane and less ignition lead.

B.T.W., my engine is 15.01:1 static, with a fairly long duration flat tappet cam. I run any generic "110" leaded fuel that is available, but never spin it over 6500 RPM's, run it cool, (130 at the line) and run it fat on the carb jetting.

ewgant01 · 04-02-2008, 12:06 PM

C-11 might be a better choice. I'd call VP, they might know what would be your best choice.

J Kuchel · 04-03-2008, 05:10 PM

I run the engine to 6500 rpm"s, so will a unleaded fuel work? I thought I had to use a leaded fuel.

ewgant01 · 04-03-2008, 06:53 PM

http://www.vpracingfuels.com/vp_01_fuels.html
that's VP's page listing their fuels and what they are best used in.

04-01-2008, 09:04 PM	#1
J Kuchel Banned Join Date: Apr 2005 Location: Sterling,Illinois Posts: 111 Likes: 0 Liked 0 Times in 0 Posts	VP race fuels I run a BBC that has 9.69 to 1 comp.. I have always used VP C-12 fuel but I don"t need all of the octane so, I was thinking of switching to VP Motorsport 105L fuel. It is suppose to be good to 11 to 1 comp.. It has a motor octane of 101 and a specific gravity of .745 - .760 @ 60 degrees F. Can someone tell me if this is a good choice? I like to stay with VP fuel. It is going to be for a bracket car. Last edited by J Kuchel; 04-01-2008 at 09:32 PM.

04-01-2008, 09:54 PM	#2
Caperat Junior Member Join Date: Jun 2006 Location: CANADA Posts: 76 Likes: 0 Liked 0 Times in 0 Posts	Re: VP race fuels Save your hard earned cash and run the rat on high test pump gas. I've played with the same combo and the blue barrel juice is a waste of money unless you want to run some spray.

04-02-2008, 02:33 AM	#3
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	Re: VP race fuels I'd say sunoco ultra 94 would be fine! I ran cam2 in my old bracket car till one day I ran out in the 6th round of elim. all i had was generator gas ...put it in & the car broke out! it was a 9.5 comp. car. __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"

04-02-2008, 06:37 AM	#4
J Kuchel Banned Join Date: Apr 2005 Location: Sterling,Illinois Posts: 111 Likes: 0 Liked 0 Times in 0 Posts	Re: VP race fuels Ok does the static comp. and the cranking comp. make that much difference? The static is 9.69 to 1 but it has alot of cranking comp. due to the camshaft profile.

04-02-2008, 12:06 PM	#6
ewgant01 Junior Member Join Date: Feb 2008 Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: VP race fuels C-11 might be a better choice. I'd call VP, they might know what would be your best choice.

04-03-2008, 05:10 PM	#7
J Kuchel Banned Join Date: Apr 2005 Location: Sterling,Illinois Posts: 111 Likes: 0 Liked 0 Times in 0 Posts	Re: VP race fuels I run the engine to 6500 rpm"s, so will a unleaded fuel work? I thought I had to use a leaded fuel.

04-03-2008, 06:53 PM	#8
ewgant01 Junior Member Join Date: Feb 2008 Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: VP race fuels http://www.vpracingfuels.com/vp_01_fuels.html that's VP's page listing their fuels and what they are best used in.