V1 LNF full manual

[TheNuker]

Not sure if this has been posted before, But its pretty helpful. It has all of the diagrams and torque values too.

Nuker-

 

[RouteAbel]

Thanks Nuker.

 

[JBINTX]

Does anyone have the correct pressures for a LNF cylinder compression check? I have found all kinds of numbers quoted on other forums, but none referencing GM explicitly.

 

[Gtstorey]

I can see if the service manual has any numbers this evening. I really thought that it was all fairly close for all gas engines.

 

[Desert Sasqwatch]

GM Authority (.com) states the LNF is 9.2:1 CR. Wikipedia corroborates the 9.2:1 CR for the LNF.

LDK engines are listed as 9.2:1 CR in both places.

From everything I can locate, in multiple forums on several Ecotec web pages, a cold crank compression ratio (2-3 engine rotations) is stated as 160-175 on a 'new' (crate) engine tested with no or low miles.

A quick calculation for a 500cc cylinder that is compressing ambient air to 9.2 times atmospheric pressure results in approximately 130 psi. But this doesn't account for the dynamics of a motor or a combustible air/fuel mixture.

 

[Gtstorey]

2010 manual

 

[Goblinfanclub1234]

make sure to adjust compression for altitude also...I am a 6,600 ft...my compression numbers were garbage by regular standards haha!!