Gonna run a compression check on my 4.8L. Just wanted to know what the normal cylinder psi should be when I do it.
Gonna run a compression check on my 4.8L. Just wanted to know what the normal cylinder psi should be when I do it.
~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~
Should be around 170 or so.
2004 Silverado Crew Cab, forged iron 5.7, STS w/MP turbo, 10+ psi, FMIC, Tial 50mm BOV, Vic Jr, Snow performance meth, MTI Stealth cam .220/.220 .581/.581 115lsa, Comp chromoly pushrods, Yank TT3000 stall, LS1 Efans, 160 tstat, Trucool 40k trans cooler, 60# injectors, Walbro fuel pump, Patriot springs, Built 4l65E w/billet input & output shafts, Eaton posi, SD tuned...all installed by Klein North Automotive
mine is only 155???? in my 4.8 i mean 408 ...... remeber your last cylinders may be a little less if the battery gets low.... dont let this alarm you
Mine were 165-170 last time I checked and the bad one was around 90 or so. It will be evident if one is off.
2004 Silverado Crew Cab, forged iron 5.7, STS w/MP turbo, 10+ psi, FMIC, Tial 50mm BOV, Vic Jr, Snow performance meth, MTI Stealth cam .220/.220 .581/.581 115lsa, Comp chromoly pushrods, Yank TT3000 stall, LS1 Efans, 160 tstat, Trucool 40k trans cooler, 60# injectors, Walbro fuel pump, Patriot springs, Built 4l65E w/billet input & output shafts, Eaton posi, SD tuned...all installed by Klein North Automotive
Well, all cylinders were between 160 and 190. I'm assuming the higher cylinder pressures were due to excess carbon build up on the piston heads. Gonna fire it up as soon as my rebuilt turbo arrives and gets installed.
~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~
sounds good
did that broken rocker damage your turbo, or is this just a routine rebuild?Originally Posted by jetmech
No, the broken rocker arm did not induce the turbo rebuild.....the oil-pissing turbo is a long story. I figured since my truck is not drivable at the moment, it was time to get it rebuilt.
~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~
Ah I see, definitely the right time to do it
Wish me luck guys. It's Monday night and all I have to do tommorow is install the rebuilt turbo. Then it's game time for my engine after the broken rocker arm episode. I'm tired of driving that damn SLOW-bra so with any luck, my truck will be back on the road soon.....and did I mention my truck is faster than that damn SLOW-bra???
~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~
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