Technical Compression

I was at the auto show and came across the Ford exhibit then saw this, I thought anything higher than 10-1 was not wise anymore with the gas at the pumps??


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I have 12.5-1 in my L-88 clone destroyed 454 tunnel ram street mill, just ad octane...650+ponies

 

Its direct injected, no fuel to detonate.

 

I might be mistaken but if that's a new engine, they are able to get away from detonation with high comp numbers by way of knock sensors, chamber design, aluminum heads, and other stuff which I am not sure of. Could be wrong, but I'm pretty sure most new engines are running pretty high compression ratios relative to what they did a long time ago.

 

what did that motor run on? E-85? what octane is E-85 anyway?

 

Pretty sure E-85 is 100+ octane

 

Some modern cars can get away with 13:1. When you have knock sensors, direct fuel injection, variable valve timing, and sophisticated ignition timing, these things are possible. Old school= not so much.

 

Aluminum heads along with direct injection allows for much higher compression, there is also a lot of computational muscle thats been thrown at the chamber design to help optimize it along with the engine electronics.

The current mazda skyactiv motors run 14:1 outside the US and 13:1 in the US (on regular no less), the next gen is aiming for 18:1 so they can ditch the spark plug and run like a diesel.

 

Couldn't do it without computers..., on board that is.
-Dave

 

It's the new technology and a wake up call, all rolled into one.

 

Yes there was E-85 signs there can't remember if it was on this engine, they had a lineup of 5-6 engine cutaways


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It's not just the higher compression ratios. Everything from the block/head gasket design to cam timing and the computer that keeps track of it all. You can spend thousands of dollars building a jewel of a Flathead that maybe makes 200HP or buy any cheap Korean import that will blow it's doors off. It all depends on what you want in life.

 

My pickup is a 2013 F-150 with 3.5 twin turbo direct injection. I've installed an Edge Monitor to watch different functions. One I have selected is the distributor advance, now this is digital and you cannot believe how much it moves around because of the inputs from the engine. Just sayin, it's not grandpas carb,points, and advance can anymore.

 

I run 11:1 compression in my Mondello Olds 455. It does have aluminum heads, as explained to me the heads dissipate heat much more efficiently than cast iron allowing for the higher compression without detonation issues. I do run 92 octane clear (corn is for food, not fuel). Been built for 5 years, light drag racing duty (1/8th mile, 7.42) no issues.

 

Corn is just feed that hasn't been turned into steaks yet.

 

Geee, isn't E-85 fuel?

 

yeah, I'm ready to see the motor run without fuel....