Not sure how many view Farsebook but this is one stout "pump gas" Drag Week build.
https://www.facebook.com/jeff.sias/videos/10157704287379826/
Havent been on here in a while, i check in ever few months to see if i am missing anything. How have you been Paul?that's Doc's Notch although seems like he hasn't been here in some time
In my opinion it is all about the combination, these cylinder heads have a VERY efficient chamber, and are dont really need much timing to get the job done. The cam also plays a big role, but there are guys in Australia with similar combos that run a little more compression and much more aggressive cams on pump gas.So what is the trick to getting a 13.2:1 compression engine to run off pump gas?
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What Ed did not mention in the original post is that it is 93 octane from Sunoco, 10 fresh gallons and the other 3-4 in the tank had been sitting for about a year. Maybe the 3 or 4 gallons soaked some oxygen up from sitting so long...What they are not telling you is about the fuel. 93 What? There are many versions of this fuel. Is it true pump gas? Is it race fuel made with less than 10 hydrocarbons> Is it oxygenated? Go figure.
Nothing to hide, I have a thread on the NA section at yellowbullet documenting the engine build... Thank you for the compliment.See, that's what I'm wondering, but the car community has a habit of hiding information and being incredibly dishonest. However, if the car truly runs on pump gas with no additives then that's awesome! What is the science behind running pump gas with a very high compression engine? This information could help the entire community, from every engine size and build.
Very impressive build, and it's also another reason I'm considering a 351 stroker combination.
I'll bite - besides ethanol content, what makes any pump 93 perform different from any other? I know different stations use different detergents/additives/branding, but as long as it meets the 93 octane rating, what measurable performance gains do you see?Not hating anything. Just pointing out facts. Not all fuel is created equal. Sure it my be 93 octane, tell me where you bought it and what refinery made it.
This is something I've harped on a lot. Everyone seems to think that a higher octane rating means that it burns slower, but that's not necessarily true.Race fuels can be the same octane with different flame speeds and more consistent. Try that with pump gas.
To that point, it makes power and doesn’t beat stuff up. We could have been more aggressive but Ed knows i drive the car and gave me something that wont kill the valvetrain in 500 miles. He helped get me the right spring, retainer, locks, and lifter for the engine. T he car drives better than it did with the 700hp highport setup. I can lug the car down the road at 2000rpm in high gear no problem. With the highport stuff it didnt start cleaning up till 2400rpm. Cant say enough good things about how the valvetrain performs in this setupAnother example of how Ed knows how to design a cam to make big power.
Saw on ZSR's website that Ed designed a cam for a 427 with a 240cc HP head that made 750 crank.
If you want to be serious about making power, call Ed Curtis.
Parts from the retrofit source installed by me. Lots of work, but worth the result.I wanna know where he got those headlights from.
Is this it? https://shop.zsrengines.com/products/sportsman-pump-gas-438-760hpAnother example of how Ed knows how to design a cam to make big power.
Saw on ZSR's website that Ed designed a cam for a 427 with a 240cc HP head that made 750 crank.
If you want to be serious about making power, call Ed Curtis.