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Compare 89 leaded gas to 91 10 percent ethanol

General engine tech -- Drag Racing to Circle Track

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tjs44
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Compare 89 leaded gas to 91 10 percent ethanol

Post by tjs44 » Thu Oct 10, 2019 11:29 pm

Taking a 9.5 CR iron headed engine to dyno.They have 89 leaded and I will be running 91 10 percent ethanol in the car.Is it worth me taking 10 gal of my pump gas with me or use the dyno gas.The operator suggest a one step colder plug.Tom

enigma57
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Re: Compare 89 leaded gas to 91 10 percent ethanol

Post by enigma57 » Fri Oct 11, 2019 3:06 am

I would suggest dynoing the engine running whatever fuel you will run it on in your car. And if the dyno room is set up (not all are) so you can run whatever exhaust you will run in your car as well, so much the better.

Good luck with your build,

Harry

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Re: Compare 89 leaded gas to 91 10 percent ethanol

Post by FC-Pilot » Fri Oct 11, 2019 3:57 am

I agree, take what you will end up putting in your tank. There is no point in finding the sweet spot on something that may be very different than what you will end up using. Now if you are just planning on getting an idea of the curves so you can get the right converter built or something like that, and then plan to do carb tuning in the vehicle then ok. But I still would prefer to tune it on the end result fuel.

Paul
"It's a fine line between clever and stupid." David St. Hubbins

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Re: Compare 89 leaded gas to 91 10 percent ethanol

Post by Coloradoracer » Fri Oct 11, 2019 9:41 am

When I had my junk dyno'd my guy wouldn't even supply fuel unless I was running what he had in stock. Told me to bring what I was running in the car....
Mark Goulette
Owner/Driver of the Livin' The Dream rear engine dragster
Speed kills but it's better than going slow!
http://www.livinthedreamracing.com
Authorized Amsoil Retailer

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