waddisme

New motor is ready for synthetic oil now. It is aluminum 402 with oil pressure aound 45-48 lbs at 200* normally using VR1 20-50. At the track, it gets up over 290* with pressure at 30 lbs or less going down straights. I am on Plan E with oil cooler. I now have a stock shroud with no holes to seal the air coming thru coolers. Hopefully that should take car of the heat. There is a good deal going on the Amsoil 10-40 or will that now be thick enough? It is a dd with 1 track day per month, occasionally 2. Thoughts?

PS - will it run any cooler with the synthetic oil?

C66 Racing

Dropped you more info in a PM, but sharing a little of it here. Given that you have been using a 50 grade oil, I'd recommend starting with that and seeing what changes you note in oil temps before trying a 40 grade.

AMSOIL makes two:
AMSOIL SAE Synthetic Premium Protection 20w50 (Product Code AROQT)
(zinc – 1379 ppm, phosphorus 1266 ppm)
AMSOIL Dominator Synthetic 15w50 Racing Motor Oil
(Product Code RD50QT)
(zinc – 1575 ppm, phosphorus 1474 ppm)

The Dominator is the better choice for the track, but doesn't have much in the way of detergents or dispersants needed for a daily driver. But, if you change your oil often, they probably aren't needed.

The Premium Performance is a really good oil with only slightly less ZDDP than that of the Dominator racing oil, but does have the detergents and dispersants needed for daily driving. If you drive more than 3k miles per oil change, I'd go with the former.

Rob's 73

I'm surprised you kept running it. My new motor was a little better than that, low 30's oil pressure, with the same oil. I ran one session and took the motor back to the builder. They tightened up the bearing clearances and I have great oil pressure now with 5w30. Haven't been back to the track yet. What oil pump are you running? I am using the GM High Volume. The thicker oil is not helping with the temps. My cruise temp dropped 10 degrees with the new bearings and thinner oil.

AU N EGL

You guys need a bigger oil cooler and may be a bigger radiator for those 40x motors.

Really should get those oil temps down under 250*

waddisme

Oil pump is a Texas Speed ported and shimmed LS6. Not sure I could go as low as 30W, but seems like a 40W would help with temps, but I would rather address oil temps with cooler.

Like I said, I am already on Plan E with cooler. If new configuration (Vararam and stock shroud) doesn't help, then, I will do fresh air mod and move cooler to bumper. Thanks for input.

Rob's 73

The GM High Volume pump is supposed to be able to flow about 30% more than the LS6 pump. I think they are less than $100. Good luck.

AU N EGL

Get rid of the v-ram. those are for drag racers and may hurt low to mid range performance then help. High Velocity of air not high volume which provides much more torque and better all around performance.

A calloway honker, Hooker or Halltech CAI. Put the oil cooler as a stand alone in front of the radiator. Bigger radiator if you dont already have for that 402.

waddisme

I have the DeWitts, so no issues with coolant temps. Oil cooler is centered right in front of ac condensor. I had the Halltech intake, but it would not fit over shroud without pressing shroud against oil cooler. So I was using it with my MTI shroud which has the hole in the middle. I was getting 20 mins at Lowes in 90* heat before oil temps got to 290+. But this did not completely seal the air flow, so I thought I would just change the whole air intake so I could use stock shroud. Now all is sealed. I will see how this does Friday at HOT Road Atl. Thanks for the input.

I ordered the AMSOIL 20-50 premium from Subdriver so I will see how that does.

AU N EGL

290* is still too high

Good Luck at HOTLanta