[Dragncar]

Originally Posted by S/st 54

Billy thanks for sharing. I also have seen the #2 main bearing issue. I would just roll another bearing in #2 at the end of the season.I drill out/enlarge the bearing from the oil feed I’m not really sure how well it works but I still do it. I think your onto something with the roller cam bearings giving the mains more oil. I think it was LPI that drilled out the main saddle oil feed hole and the lifter galley’s to make both bigger to increase oil volume. That might be worth a phone call to Mark Luhn.
Also in a extreme case I think Mike and Eric went above and beyond to feed the #2 main extra oil on their fire breathing nitro motor. There is a thread on here about that somewhere about how they got the bottom end to live.

Roller cam bearings are also going to give you 5-10 HP just from all that oil not dumping on the crank. Power to be had there per the folks in the know.
I drill everyone of my main bearings the same size as the oil hole in the block on the singles and on the tri holes the one on the "tab" side of the 3 holes that intersect. It gets the shot of oil.
Heck with that "slot" those bearing as is. Oil still hits the back of those bearings.
As straight a shot as I can get.
BTW, why can,t we get priority main oiling in our aftermarket blocks ? Why cant it get re routed. Is it possible ?

[slowbird]

Originally Posted by Dragncar

Roller cam bearings are also going to give you 5-10 HP just from all that oil not dumping on the crank. Power to be had there per the folks in the know.

I'd be very curious if the person that told you this actually tested this or just guessing based on theory.

[hp 400 dave]

I wanted to seal up my valley area for oil control on my 540 build. My engine builder said there is 0 hp there. He built all of Kenny Koretsky's pro stock engines. One time he was working with Frank Iaconio and they went as far as encasing the cam in a tube with a drain at both ends. Nothing noticable. Maybe someone else has different info.

[RAIV-Z]

Originally Posted by Bill Meyer

Raven: I’m a little confused on the picture. The bearing on the right looks like it has a little skew line hone issue. Maybe it’s the overlay of the other bearing shell. Anyway, is the # 2 main the one that goes first for you guys. Does anyone else see this trend or what can be done to fix it. I would think based on the oiling route that #1 would be more prone to heat, especially with the front load on the crankshaft..........ideas.....

We haven't had enough run-time to determine if #2 is always the worst. This is the first refresh.

[RAIV-Z]

Originally Posted by v869tr6

What oil pressure did you run in 2019?

Comparison of a 2018 and 2019 run attached.

[73 TRANSAM]

Raven, What oil pump do u run? Thanks.

[Scott Roberts]

I would like to know the oil pump as well as pressure, clearance on mains, and rods if you're willing to share..

[Scott Roberts]

Very nice bracket engine by the way Aaron! That's some nice steam..

[RAIV-Z]

Originally Posted by 73 TRANSAM

Raven, What oil pump do u run? Thanks.

Titian Oil Pump.
http://www.titanspeed.com/

[RAIV-Z]

Originally Posted by Scott Roberts

I would like to know the oil pump as well as pressure, clearance on mains, and rods if you're willing to share..

The clearances on the mains were 0.0035 and 0.003 on the rods.
Rod bearings looked like new.

[slowbird]

Originally Posted by RAIV-Z

The clearances on the mains were 0.0035 and 0.003 on the rods.
Rod bearings looked like new.

Fully counter weighted crank i assume?

[RAIV-Z]

Originally Posted by slowbird

Fully counter weighted crank i assume?

Yes, fully counterweighted Crower billet.

[Dragncar]

Originally Posted by slowbird

I'd be very curious if the person that told you this actually tested this or just guessing based on theory.

Someone who has made big NA power with a Pontiac. As good as they get, who am I to disagree? I passes it on, do what you like with it.

[Dragncar]

Originally Posted by RAIV-Z

The clearances on the mains were 0.0035 and 0.003 on the rods.
Rod bearings looked like new.

The 461 I am doing right now is .003 on the mains and .003 on the rods too. I can get my desired .025 with a set of coated Callico bearings. But I already have good bearings that will get me the .003
Maybe its not worth the expense of buying the coated bearings ?

[slowbird]

Originally Posted by Dragncar

Someone who has made big NA power with a Pontiac. As good as they get, who am I to disagree? I passes it on, do what you like with it.

Nothing to do with it, i've ran both.

[slowbird]

Originally Posted by RAIV-Z

Yes, fully counterweighted Crower billet.

What balancer?

[Dragncar]

Originally Posted by slowbird

Nothing to do with it, i've ran both.

Did you dyno the engine with a slipper cam then dyno the engine with the exact same(why would you) grind cam but 50mm and needle bearings instead of babbit ?
That being the only change ?

[WDCreech]

Which flexplate? Pontiac balance flexplate helps keep the crank from climbing up #2 main and knocking out 3/4 rod, Its only a couple ounces light. Its counter balanced, not like 28ounce weighted external balance.


Marty Creech

[RAIV-Z]

Originally Posted by slowbird

What balancer?

Innovators West damper. Updating the damper hub from the stock Pontiac 1 7/8th OD to 2 1/16, also adding a second key way. The BOP belt drive sprocket was opened up to accept the larger size hub.

[slowbird]

Originally Posted by RAIV-Z

Innovators West damper. Updating the damper hub from the stock Pontiac 1 7/8th OD to 2 1/16, also adding a second key way. The BOP belt drive sprocket was opened up to accept the larger size hub.

Alum rods?

Bill Meyer the Callies rods in this build alum or steel?