Did another EFI build for someone on here. The specs are;
.040 over F block
My Custom Racetec piston, 15cc dish, 10.0:1
My Procomp heads, 2.125/1.68
Custom Lunati Hyd Roller, 231/238 on a 112lsa.
Holley Street Dominator intake, bunged for EFI
AEM Infinity 508 ECU, coil on plug
Holley 950cfm throttle body
Eagle Crank and H beam rods
Studded and strapped block
First set of pulls done with Valvoline VR1 20W-50, second set of pulls done with Mobil 1 Synthetic 15W-50
Remember all pulls are done with mufflers and at or close to running temps. These are the second set of pulls. Anyone want to guess the difference in hp between the two oils? I have that sheet too.
Hope this helps. Thanks!

 

Is there really much difference?

 

Take a guess!
And something else you all may want to notice, it made as much or more at 33* of timing as it did at 34. Too many of you are hung up on the "36* all in by 3000" concept. I've done dozens of these and have yet to have one make more power at 36* than at a lower amount of total advance.

 

nice i dream of the day i drop a 500+hp 560trq motor in my car

I will guess 10hp diff in oils based on nothing more than a swag

 

That's one guess.

 

In theory the oils both being a 50W hot should run similar numbers, I say 3 hp. Probably more, please tell.

 

i wonder what it made in torque down lower in the RPM range, its already on the downslope at 3500

 

 

Awesome guess, I thought the difference might be small. Interesting to see on a Dyno, how different oils effect hp an tq.

 

Couple of observations. Why does the oil pressure drop and come back. I've seen a few dyno tests posted by yourself, why is HP peak always seem to be at such a low RPM?

 

IM gonna guess his low RPM numbers are due to customer usage. Now as for the timing I played with timing at the track from 32 to 38 and 34 is the sweet spot.

 

 

Because it doesn't need to be higher. HP is all about moving air through the engine. A 350 needs to rev to 6500 RPM to move as much air as a 455 does at 5000 RPM. Once you factor in reciprocating mass and resulting stresses, it's a trade-off as to where you want the HP peak to be.

 

10w-30 oil would pick up another 5 HP.

 

I always used vr1 . Now Mark explained the importance of a few hp gained by using it! Sweet!!!!!😀 Thanks for all the info and a good read .

 

Which is quicker?

500 HP @ 6500 520 TQ @ 4400
500 HP @ 5300 520 TQ @ 3800

 

Valvoline VR1 20/50 oil is up on power with ring seal challenged engines, used mostly on big bore engines that are harder to seal due to bore size 4.500 on up. If the ring seal is good I would think a 4.185 bore would make more power with 10/30 oil. I've seen big HP gains with 0-20 LAT oil. I also like Maxima a lot, it does not foam, important on my Buick, not big HP though.

 

Depends on the gearing, tire size, weight, etc.

 

Uhh sorry Neely but I think you may have it backwards. The Mobil 1 made 3 more hp that the VR1. But I'll still continue to use the VR1, good stuff.
Thanks.

 

Yep my mistake! I use vr1 because it has enough zinc in it or did. Never used mobile 1.

 

Mark the mobile1 was a full synthetic oil correct? The VR1 is not! Maybe I am wrong but isn't full synthetic oil supposed to be more slippery than non synthetic oil. Might account for the difference.

 

 

The Zinc/ZDDP thing is a consideration with me, because I have older motorcycles that need it. It would be nice to just keep one brand of oil in the garage for everything.

 

The 500@ 6500. Reasoning is you will have to gear the other motor higher (lower numerically) for them to cross the finish line at the same mph (equal size tires, weight, etc). This lessened gear reduction will consequently reduce torque multiplication at the rear wheels.

 

Pretty simple concept isn't it, more RPM more converter more gear, more TQ multiplication, more acceleration.

 

Any pictures of the COP setup?