Full groove mains and bore up suply?

[NorwayCuda69]

Hey.

As we now have "agreed" hehe to use the HV oil pump in a stroker combo. i have seen some modifications to the oil system, true or false.. lucky as i am i have 2 sets of main bearings laying in the shelf.. some old performance book say: Use 2 upper main shells and bore up the mains oil suply holes, this will make use of the hv pump and constantly suply the rods with oil.

ok now but if you use an upper grooved shell, dont u gett minor bearing surface on the lower mains? as far as i know the main oil feed goes into the left oil galley (therefore some use crossover tube) the rear main i beleave also get the oil directly from the main bore from the filter..

New question: aint it smarter to bore up the holes from the left oil galley and down to the mains. and have full grove cam bearings for constant oil suply to the right galley? If someone has a link to some pro oilsyste mods ill be happy!:read2::read2::snakeman:

 

[moper]

I'm on my way out for a Drs appt... but you have the oil flow and reasons for doing mods wrong unless I'm misreading... And the HV is used because of clearances... not grooves in the bearings. If the clearances are beyond .0025 on the mains, AND the rods are beyond .0025", AND you plan to maintain rpms beyond 6K regularly, then you might want to use the HV pump. The full grooves have nothing to do with the pump. Thye have to do with the load carrying capacity of the rod bearing at speed.

 

[NorwayCuda69]

Yes, been reading on a more reliable source now.. seems like al the old prformance mods like cross tubing.. galley tubing and needle bearings are done to reduce oil flow and leaks so u get adequate oiling with a stock pump to save hp.. ill do that on my next build.. as for now i just have std everything but the hv pump, pan and pickup.

 

[moper]

Ok, back from Drs and sounds like you got a litttle more info... It's all about oil control, not always pressure and volume. In every engine I do I enlarge the main feeds from the lifter galley. Because regardless of pressure... a bigger hole moves more oil. I also drill extra drainback holes in the webbing next to the lifters so more oil goes right back down to the sump. You do not do anythign to the cam or cam bearings to get more oil down to the mains and rods. Also, you can drill extra holes in the steel plate where the oil filter screws on, and radius the hole drilled under the plate. That's it. Run enough oil in the pan and if you run a windage tray, make sure it is clearanced properly and enlarge the escape paths by bending the slots open further.

 

[C130 Chief]

More oil is not always better. The rings must control any additional oil you are slinging upwards into the cylinders. Detonation caused by oil contamination of the fuel can become quite destructive, far more so than any lack of oiling to the bottom end (which Mopar engines were not known for even stock). It also takes a significant amount of power to pump all that oil. Power wasted if it's slung needlessly about the crankcase or directly returned to the pan.

Ask yourself who's design principle you subscribe to more closely, Enzo Ferarri or Colin Chapman...

 

[NorwayCuda69]

hey, i was at school for some days.. srry for late reply.. tnx moper.. im going to bore the main oil feeds from galley (just a tiny bit tough) today i have just bored 3 small holes in the filter plate and ported/rounded the hole behind it.. i have a milodon windage tray.. but i already had to notch the escape holes a bit cus of the rod bolts (4" crank") maybe i just open the other side of the holes lol. anywas now i dot hink lack of oil ever going to be a problem..