High drive pressure will leave more residual exhaust gas in the chamber, much like EGR, which should result in a lower peak combustion temperature and therefore less peak cylinder pressure according to how I understand (or don't) the combustion event, however, on a diesel engine that has no valve overlap there is going to be high exhaust valve/exhaust port temps due to no cooling air passing through on the non existant valve overlap, the higher the temp and pressure the more heat transfer to the engines head/exhaust valve so things might melt on a bloke if the heat/pressure loads get out of hand. Personally, I would follow the popular engine manufacturers engineers method of getting good engine life when turboing an N.A. engine, lower the compression ratio (there is a mathematical way to work how much lower you should go...but don't ask me for the correct answer, I would just copy off the factory), and fit an egt gauge....yes I know that you won't get time to look at a gauge while trying to control an animal tractor during a run, so why not buy an egt gauge that has an adjustable high temp alarm and hook up the overheat relay on the gauge to a simple water injection setup? Here's a cheap but not nasty gauge that works well: http://www.auberins.com/index.php?main_page=product_info&cPath=5&products_id=139&zenid=1b6cf09cc9e005f44cef75787b6a1210 You have to put the probes cost on top of this, so around $100. from memory gets you cheap engine insurance!EDIT: here's a link to the probe: http://www.auberins.com/index.php?main_page=product_info&cPath=5_22&products_id=69
Thats gotta be tough on the starter motor, almost 10 minutes to fire it up! I'm wondering if they have tried some pre-heating techniques. I wouldn't want to be breathing all of that smoke as it's a known carcinogen!
Quote from: Blownoiler on February 18, 2013, 08:54:44 pmHigh drive pressure will leave more residual exhaust gas in the chamber, much like EGR, which should result in a lower peak combustion temperature and therefore less peak cylinder pressure according to how I understand (or don't) the combustion event, however, on a diesel engine that has no valve overlap there is going to be high exhaust valve/exhaust port temps due to no cooling air passing through on the non existant valve overlap, the higher the temp and pressure the more heat transfer to the engines head/exhaust valve so things might melt on a bloke if the heat/pressure loads get out of hand. Personally, I would follow the popular engine manufacturers engineers method of getting good engine life when turboing an N.A. engine, lower the compression ratio (there is a mathematical way to work how much lower you should go...but don't ask me for the correct answer, I would just copy off the factory), and fit an egt gauge....yes I know that you won't get time to look at a gauge while trying to control an animal tractor during a run, so why not buy an egt gauge that has an adjustable high temp alarm and hook up the overheat relay on the gauge to a simple water injection setup? Here's a cheap but not nasty gauge that works well: http://www.auberins.com/index.php?main_page=product_info&cPath=5&products_id=139&zenid=1b6cf09cc9e005f44cef75787b6a1210 You have to put the probes cost on top of this, so around $100. from memory gets you cheap engine insurance!EDIT: here's a link to the probe: http://www.auberins.com/index.php?main_page=product_info&cPath=5_22&products_id=69I had one of these on my modified 1 cylinder alcohol burning Kohler tractor but the vibration killed it in no time. Its the tractor in my ID picture.
so, your telling me that if the engine has 50psi drive pressure, its going to have the EXACT SAME PCP as a n/a with NO drive pressure?i find that HARD to believe...