Let me try to understand this...

[csolas]

Coyote gen3 12:1 compression ratio + forced induction + stock internals = blown engine?

I always heard that boosted cars are 8:1 and 9:1 relative low compression.... now I see a few gen 3 coyote blowing up after going forced induction in youtube. so what am I missing here?

Should I go with gen 2 block before boosting?

Do you guys have the same concern I have about way too high compression for boost?

why are people boosting gen 3 coyotes with that outrageous compression for pump gas?

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[Bluelightning]

Modern timing control and fueling make it possible.

A gen 2 from the factory is 11:1, so still what used to be considered high compression for boost.

Outside of Youtube you have guys like me that have their '18s boosted and have no issues. 93 pump gas making somewhere over 700 to the wheels and having tons of fun.

 

[csolas]

Modern timing control and fueling make it possible.

A gen 2 from the factory is 11:1, so still what used to be considered high compression for boost.

Outside of Youtube you have guys like me that have their '18s boosted and have no issues. 93 pump gas making somewhere over 700 to the wheels and having tons of fun.

thanks for the feedback. are you fully stock internals and tranny? do you have the tick or the rattle LOL?

 

[Bluelightning]

thanks for the feedback. are you fully stock internals and tranny?

Fully stock internals down to the crank sprocket and oil pump gears. MT-82, no broken shift forks, stock clutch, no ticks or rattles of any kind. Stage 2 Whipple Kit on 93 octane with a 3.75" pulley.

 

[Boduke0220]

you will be fine. running 850rwhp on my 16 with a whipple at 15psi. Daily Driven on E85. these motors and their variable cam timing can do some amazing things. Get with a good tuner and buy quality parts and you "should" be fine!

 

[Zinc03svt]

Gen 1 = 11 to 1
Gen 2 = 11.5 to 1
Gen 3 = 12 to 1

 

[ahl395]

As said, timing control and a good tune make it possible.

The higher the compression the lower amount of boost/timing you can run, but the extra compression adds power itself to offset this. It certainly makes it easier to blow a motor when people are trying to run the same amounts of boost as you do on a gen 2 motor, tuning and pulley selection have to be made more carefully; and E85 is of course ideal.

 

[gimmie11s]

I made 913whp at 13.5 psi.

Engine is 100% stock including oil pump gears and all.

 

[Jay-rod427]

Static compression has become kind of irrelevant. The cylinder pressure with static compression+boost can be controlled somewhat with the cam timing.

 

[sigintel]

Closing intake valve late drops the compression.
Would be interesting to test compression while adjusting cam phasers to find out how much.

Not sure how much exhaust late close or overlap you can get for blow thru cooling and dropping compression.

 

[onefastmf]

I think low compression and boost was a thing of the 80's and 90's, now with modern electronics its almost like the more the better, lol

 

[csolas]

Thanks guys!

 

[blue5.slow]

Fully stock internals down to the crank sprocket and oil pump gears. MT-82, no broken shift forks, stock clutch, no ticks or rattles of any kind. Stage 2 Whipple Kit on 93 octane with a 3.75" pulley.

You sir are a unicorn

 

[SolarFlare]

Solid 2 year bump

 

[engineermike]

Who else is running the Whipple 3.625 pulley(13 psi), *true* 93 octane, and 18 deg timing?

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