Good reason to run a 6.2 on premium fuel

[Geotrash]

Caddy engines have higher compression and that’s why you can’t run them on 87. Can’t tune for 87 on an engine that has 10:1 compression.

The L92 in the 2007-08 Escalade and the 2007-08 Denali are mechanically identical (trust me on this One ), but they were "rated" at different power ratings in the marketing literature.

 

[swathdiver]

Caddy engines have higher compression and that’s why you can’t run them on 87. Can’t tune for 87 on an engine that has 10:1 compression.

Wouldn't mind seeing documentation on that. All of my information states that the L92s are 10.5:1.

 

[a4edwin]

Caddy engines have higher compression and that’s why you can’t run them on 87. Can’t tune for 87 on an engine that has 10:1 compression.

So what’s the compression ration on the Denali for 07-08?

 

[wsteele]

Everything I have ever read is all three L92, L9H and L94 all had 10.5:1 compression ratio and made 403hp.

 

[wsteele]

From the 2007 shop manual

ENGINE MECHANICAL SPECIFICATIONS (RPO L92 VIN 8)

General Specification

Application
Metric
English

 Engine Type V8

 Displacement 6.2L L92 376 CID

 RPO

 VIN 8

 Bore 103.241-103.259 mm
4.065-4.065 in

 Stroke
92.0 mm 3.622 in

 Compression Ratio
10.5:1

 

[Snowbound]

Yes, your right. The Denali and the LTZ Tahoe have the same power plant as the Caddy. But I didn’t know you can run it on 87, thought it was the same as the caddy with premium only.

 

[wsteele]

I am thinking those knock sensors would be pretty active with a tank full of 87.

 

[Snowbound]

Right from owners manual for an 08 Yukon Denali.

Link for reference.

https://my.gmc.com/content/dam/gmownercenter/gmna/dynamic/manuals/2008/gmc/yukon_xl_denali/2008_gmc_yukon_xl_denali_owners.pdf

 

[Snowbound]

Same thing for an 08 Escalade.

Reference.

https://my.cadillac.com/content/dam/gmownercenter/gmna/dynamic/manuals/2008/cadillac/escalade/2008_cadillac_escalade_owners.pdf

 

[Snowbound]

So will it run on 87, sure. So will my chainsaw but not very long. The Cadillac has a better tune which gives it a higher horsepower rating but the Escalade, Yukon Denali and LTZ Tahoe all have a fuel recommendation of 91+.