|
Unless you'[ve got a high reving race engine, you're actually better off to use *lower* octane gas. Low compression engines can get more energy out.
|
for what its worth, i use toluene with 98octane fuel at a ratio of about 10% in my 347 with alloy heads and 10.18.1comp
it dosent really increase performance by the seat of you pants but the throttle response and overall smoothness of the engine is very noticeable |
|
Howdy,
toluene is real safe to use. I know people who use it in their meth labs and they have only burned their trailers down a couple of times ( I'm being serious about this part). Just try not to get any on your paint job!:o |
Okay, so what should I use?
I have a 1966 427 FE with dual carb setup 10.5:1 compression, medium riser.
I think I run okay on Chevron 93, but sometimes it burps alittle bit at start up, more if not really warmed up. Should I use that lead substitute since I have honest pre- unleaded gas engine? What additives if any? thanks, Brett Bolte |
Bret,
If you are still using the original valves, I would say yes. If they have been changed to newer ones, then the lead should not be needed. The lead ( anti-knock coumpound) served two functions in gasoline. One was to increase octane and the other was to lubricate the valves. I heard that when unleaded gas first started being used (1975) the car companies added valve rotaters to solve this problem. I was told that it was 10 times more flamable than gas. I know that it certain building we even had to use brass tools to avoid any chance of causing a spark. Bud |
captain
The deal is not done until tha car is in the driveway but the two under consideration both have 351 Strokers net 408cubic in, 10.50 compression ratio making around 500 Hp.
|
The way it was explained to me is that a long duration cam will bleed off cylinder pressure at lower rpm's, but at the working rpm of the motor, you still need the fuel to have the octane rating that the static compression dictates. So if your cam (and rest of motor) is made to run 8000 rpm, you can put around town on lower octane gas, but if you are going to run it to 8000, you need the proper octane rating. What I have seen is when a high compression motor is putt-putted around on too low octane fuel, it just fouls up the plugs, but when put to hard work on the same fuel, it cracks spark plug insulators. You all do what you want with toluene and your $10,000 motors, I would rather buy sunoco 114 and mix that with 92.
|
Nantucket,
Sounds radical. What brand Cobra? |
cap
Superformance
|
wise choice. There are some good buys around used.
|
captain
Have you ever looked at Factory Five ? They are right here in Mass. within an hours drive.
|
AMSOIL
RE: AMSOIL
2206 Winter St Superior WI 54880 Series 2000 Octane Boost Sent the following e-mail on July 6th, did not receive a reply, your thoughts ? Date: Sun Jul 6, 2003 6:17:16 PM America/New_York To: tom@bestoil.com Subject: Octane Booster Tom: Page 19 from the Factory Direct Catalog: The Series 2000 Octane Booster mentions a 4 to 5 point octane increase from 88 octane fuel. To clarify: * Octane increases from 88.0 to 88.4 or 88.5, or * Octane increases from 88.0 to 92.0 or 93.0 Which of the above is correct ? |
Unless there is a revolutionary new product on the market, It would take far more than a few ounces to bump 88.0 to 93.0......
|
Nantucket,
FF5 compared to Superformance is comparing an Emersom TV to a Sony. Nuf said. |
Quote:
Any of the professional builders in the country could build just as good or better rollers than Superformance, starting with the FFR kit, if that is the direction someone wishes to take. At equal or better pricing. Most FFR owners build their own and take pride in their build as no one on the African assembly line can. |
Toulene
I've been using Toulene (or Zylene) in both my Grand National Buick (Turbo) and my Buick powered Cobra (11.5:1) compression for several years. Simply mix either at 10-20% (no higher) with a good grade of 93 octane and you get a true 96-98 octane fuel. Its cheap and easy to use. I ALWAYS mix it in a can first though.
Also, commercial octane boosters are a joke. If you could put 12 ounces of ANY chemical in a full tank of gas and get 100 octane the oil companies would be doing it. The other alternative is mixing race fuel with 93 octane to get what octane you need. Turbo's need a lot of octane depending on the boost. My Cobra only needs a little over 93 to be "happy". |
Hey Guys:
Just a couple of thoughts - Octane booster is as effective boosting octane as those bracelets are at getting rid of aches and pains. There are some beautiful FFR cars out there, I saw one tonight. Bob |
Bart,
I think you are letting your emotions run away with your common sense. The FF5 chassis doesn't compare to the Superformance. If the exceptional builder throws away the FF5 chassis then all he has left is the donor car and the bill of sale. Just ask Outlaw [a FF5 dealer] how he modified his FF5 to make it safer and better. Also his asking price of $60,000. |
Captain
It is not polite to knock others cars just because you could afford a more expensive car. Kind of like a Porsche Turbo driver saying his car is better than your Cobra right before you spank him in a drag race. I have a Hunter Cobra and to me the chassis is as good as a Superformance as they are both ladder frames and both use a IRS suspension. (Ford on SPF and Vette on Hunter) If you build a FFR with a IRS suspension it is comparable to a SPF suspension and the car is a little lighter to boot. The SPF has a little better body because it has a liner on the hood and trunk but it is made from fiberglass just like all other kits out there. I would guess if SPF sold kits they would look about the same as almost all kit Cobras look like before they are assembled. Don't get me wrong I think the SPF cobra is a great car and one of the best body shapes with a very nice interior. The frame is nothing special except they use a IRS type suspension that is made from all new parts. If you built a FFR that way it would have a similar cost and the quality would be similar. I have seen many FFR cars on road courses and they usually run up front in the Cobra crowd. |
| All times are GMT -7. The time now is 10:20 AM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: