oil mods
Posted: Sat Apr 28, 2012 5:29 pm
Due to some problems encounted at wot & high rpm im planning on doing some mods and need help in deciding what and how to do them.
First the problems at around a 1/4 mile beforre the 3 mile marker I loose oil pressure typically im at wot and over 8k rpm in top gear, I set up a warning light to activate at or below 30psig. Seems the oil migrates to the head and wants to stay there so drain back is a problem any idea what causes this ? secondly im getting a lot of blow by (blown alky ) and the temp of the engine is not getting hot enough ,maybe this is pressurising the return passages ? causing the first problem.when I slow down and decrease my rpm's the pressure returns again .
some solutions
1. plumb in a 10 or 12 an external oil return line from the head to the sump ( where is the best place to return it to above the sump or below the oil line ?
2. Install a windage tray and crank scrapper. sadly no such beast exists for my motor how does one go about making one ??? design, material etc.
3 install a crankcase vacuum pump ( i have an electric pump and can place an exhaust venturi in as well) again where is the best place to draw the pressurised blowby gasses from the existing breather, or the rocker covers ???
4. preheating the oil to above 100 deg C and returning it to the sump before I race ?
5. experimenting with not running a radiator or running without any coolant at all remember im using a lot of methanol for fuel and planning to use some 30% nitro next time out any ideas ?
any one else experence these problems and any solutions
cheers
Gary # 282
First the problems at around a 1/4 mile beforre the 3 mile marker I loose oil pressure typically im at wot and over 8k rpm in top gear, I set up a warning light to activate at or below 30psig. Seems the oil migrates to the head and wants to stay there so drain back is a problem any idea what causes this ? secondly im getting a lot of blow by (blown alky ) and the temp of the engine is not getting hot enough ,maybe this is pressurising the return passages ? causing the first problem.when I slow down and decrease my rpm's the pressure returns again .
some solutions
1. plumb in a 10 or 12 an external oil return line from the head to the sump ( where is the best place to return it to above the sump or below the oil line ?
2. Install a windage tray and crank scrapper. sadly no such beast exists for my motor how does one go about making one ??? design, material etc.
3 install a crankcase vacuum pump ( i have an electric pump and can place an exhaust venturi in as well) again where is the best place to draw the pressurised blowby gasses from the existing breather, or the rocker covers ???
4. preheating the oil to above 100 deg C and returning it to the sump before I race ?
5. experimenting with not running a radiator or running without any coolant at all remember im using a lot of methanol for fuel and planning to use some 30% nitro next time out any ideas ?
any one else experence these problems and any solutions
cheers
Gary # 282