KR> rpm and boost pressure- sorry it is so long
Hi Guys, I need some info please. I was getting 1900 rpm max on my 2L,VW, Type 4, Turbo, Fuel Injection. After consulting various people, I rebuilt the exhaust manifold and re-set the hydraulic lifters. Now I manage to get 2800 rpm but still no boost from the turbo. I stripped out the turbo and took it to a local turbo repair shop. They say that the gap between the disc and the casing is 2mm and it should only be 3/10 of 1mm. I gave them the go ahead to rebuild it, but could this really be the problem. What rpm and boost should I be getting?? Apparently it should be 3400-3600 rpm and 40 in boost. Does this sound right? I am turning a 52 x 49 wooden prop. One guy also suggested that I replace the hydraulic lifters with solid lifters, any thoughts? Regards, Jaco Swanepoel Pretoria South Africa KR2S, ZU-DVP - Sneak preview the all-new Yahoo.com. It's not radically different. Just radically better.
KR> rpm and boost pressure- sorry it is so long
Jaco: I am not an expert on this but personally I think the use of a turbo chager beyond that required to maintain max HP at Sea Level Std. Conditions is hard on the engine. In other words use the turbo charger to hold sea level performance to altitude and compensate for high density altitude conditions. RPM has to be limited by propeller tip speed and prop pitch by manifold pressure limits. From thoise you should have some idea of HP developed to compare to base performance of the engine. I am sure there is someone on here that can really transfer understanding better than I. Don Jaco Swanepoel wrote: > Hi Guys, > I need some info please. I was getting 1900 rpm max on my 2L,VW, Type 4, > Turbo, Fuel Injection. After consulting various people, I rebuilt the exhaust > manifold and re-set the hydraulic lifters. Now I manage to get 2800 rpm but > still no boost from the turbo. I stripped out the turbo and took it to a > local turbo repair shop. They say that the gap between the disc and the > casing is 2mm and it should only be 3/10 of 1mm. I gave them the go ahead to > rebuild it, but could this really be the problem. What rpm and boost should I > be getting?? Apparently it should be 3400-3600 rpm and 40 in boost. Does this > sound right? I am turning a 52 x 49 wooden prop. One guy also suggested that > I replace the hydraulic lifters with solid lifters, any thoughts? > Regards, > Jaco Swanepoel > Pretoria > South Africa > KR2S, ZU-DVP > > > - > Sneak preview the all-new Yahoo.com. It's not radically different. Just > radically better. > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html
KR> rpm and boost pressure- sorry it is so long
Sorry Jaco but the only info I can help with is the turbo. That gap is very much the problem. A turbo is just a centrifugal compressor jet engine without the burner cans and just like any jet engine tip clearances are extremely important. I don't know what the tip clearance should be on your particular model but if it is a reputable turbo shop they will have all that info and the experience to rebuild it. I am a big fan of turbos but how they are used does affect engine life. Don't know what kind of oil you are using but if you haven't considered it you might think about synthetic. Good luck and keep us posted on your progress, Stephen Teate Paradise, Texas ste...@compositecooling.com -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Jaco Swanepoel Sent: Saturday, June 03, 2006 11:18 AM To: kr...@mylist.net Subject: KR> rpm and boost pressure- sorry it is so long Hi Guys, I need some info please. I was getting 1900 rpm max on my 2L,VW, Type 4, Turbo, Fuel Injection. After consulting various people, I rebuilt the exhaust manifold and re-set the hydraulic lifters. Now I manage to get 2800 rpm but still no boost from the turbo. I stripped out the turbo and took it to a local turbo repair shop. They say that the gap between the disc and the casing is 2mm and it should only be 3/10 of 1mm. I gave them the go ahead to rebuild it, but could this really be the problem. What rpm and boost should I be getting?? Apparently it should be 3400-3600 rpm and 40 in boost. Does this sound right? I am turning a 52 x 49 wooden prop. One guy also suggested that I replace the hydraulic lifters with solid lifters, any thoughts? Regards, Jaco Swanepoel Pretoria South Africa KR2S, ZU-DVP - Sneak preview the all-new Yahoo.com. It's not radically different. Just radically better. ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
