LLY: Compression Ratio

[A_T_Ver]

Going to start an LLY build. Wondering what CR to go with. Truck will be mainly street driven, with some drag racing and maybe a few pulls. Going to use Fingers oval bowl design. I know stock LLY (05) CP is 17.5:1. So would dropping a point or point and a half be good? Less or more? Pros and cons? Thanks!

 

[TROJAN366]

Just from seeing threads like this in the past I would say higher is better where it will be a daily driver. 16.5-17 would probably work well

 

[smkndmax05]

I went down to 15.5....

 

[sickdiesel]

i did 16.5 as i dont see the need to go lower

 

[S Phinney]

Dont go I to the 15's unless its a dedicated competition truck. I have done it there and the 17/1 that I use now is definitely without a doubt better.

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[A_T_Ver]

I'm thinking the 16.5:1 will work for me. Still daily driven for the moment.

 

[MarkBroviak]

15.25:1 in mine and love it! It all depends on your build and the power you plan to make with it. If you aren't going north of 650-700hp then stay close to 16.5:1 and you'll be fine. If you plan to go pass this by much then you need to drop the compression. Did a workstock built motor with Finger's pistons in race cast at 15.5:1, 100%injectors dual fueled and DP BMW2.5 VGT turbo and made 728hp 1489ftlbs and he is averaging over 18mpg with on 35's. The compression ratio is just a small piece of the puzzle.

 

[A_T_Ver]

Lol, you guys make this hard!

 

[moparkxracer]

We did 15.5 in mine, can't wait to see how it does.

 

[blk smoke lb7]

15.9 here

 

[quinton]

16.5 here waiting to put it in the truck to test it out.