Hi, I put in a great offer on a 2006 Cruiser with Twin Volvo Penta 5.0V8 GX i engines. I had a proper compression test done and attached are the results. I was kind of shocked surprised with 466 hours at the results. I know is well possible but don't see this much from a 2006 engines at all.
I know that the rule is 10% - 15% across the board of each cylinder within. I researched that this Penta GX i normal compression range is between 125 and 175 PSI. Calculating the average of all 8 cylinders I came up with 170psi on all 8. The test was done a few times for accuracy and this was actually the medium of high and low. The results were always +/- 1-3 psi variable.
The Engines both have 466 hours on them backed up by the ECM hook up readings and hours digital gauges. The info I have on the 1 owner from new previously is that they changed the oil & filter every 40 hours. It's a Freshwater only boat also, and is in very good condition for the age. I was a bit concerned about the 4 lowest cylinders on Port - # 6, 4 & 3, and Starboard - # 6. A long time Tech told me those were well taken care of engine numbers, and he would take those any day.
I really like the Penta GX-i that's its a V8 5.0. Not a V6 and not a 5.7 Gas wise altho I don't think there would be that big a difference in the 5.0 and 5.7 but less gas is less gas, not more. I was actually thinking about have the Heads pulled during this winter and have a guy I know well that does race engines re-do the Heads, Mild stage 1 porting and a nice Valve job. He said he see's anywhere from 30hp - 45hp increase and better fuel usage efficiency. I have had car heads done before on a Flow bench ported and matched and I think he's right. Sorry such a long post. So what are you guys thought? Please share, especially Engine Techs. Thanks.
I know that the rule is 10% - 15% across the board of each cylinder within. I researched that this Penta GX i normal compression range is between 125 and 175 PSI. Calculating the average of all 8 cylinders I came up with 170psi on all 8. The test was done a few times for accuracy and this was actually the medium of high and low. The results were always +/- 1-3 psi variable.
The Engines both have 466 hours on them backed up by the ECM hook up readings and hours digital gauges. The info I have on the 1 owner from new previously is that they changed the oil & filter every 40 hours. It's a Freshwater only boat also, and is in very good condition for the age. I was a bit concerned about the 4 lowest cylinders on Port - # 6, 4 & 3, and Starboard - # 6. A long time Tech told me those were well taken care of engine numbers, and he would take those any day.
I really like the Penta GX-i that's its a V8 5.0. Not a V6 and not a 5.7 Gas wise altho I don't think there would be that big a difference in the 5.0 and 5.7 but less gas is less gas, not more. I was actually thinking about have the Heads pulled during this winter and have a guy I know well that does race engines re-do the Heads, Mild stage 1 porting and a nice Valve job. He said he see's anywhere from 30hp - 45hp increase and better fuel usage efficiency. I have had car heads done before on a Flow bench ported and matched and I think he's right. Sorry such a long post. So what are you guys thought? Please share, especially Engine Techs. Thanks.
