I did read up on the moroso filter and that was interesting that the ability to trap smaller particulate can be working against filtering. I never considered that. It really is why some air filters can let more air through and still filter enough. I appreciate your feedback as I may have been more caught up in the microns than getting the job done.


Posted from Camaroz28.com App for Android

 

I know you may not want to, but have you considered pulling engine and checking the bearing clearances? Even just using plasti-gage will give you an idea of where you stand. I mixed and matched bearing half shells(no more than 0.0005 oversize difference between half shells) to get what I wanted. That put me very close to what I had stock.

Stock I had over 20psi at idle. With the new bearings(I replaced cam bearings too) I have over 20psi at idle. So far, it's turned out well. All I really did was a bearing refresh after checking the condition of my crank.

In this vid, you can get a good look at my present pressure at the 2:30 mark.
http://www.youtube.com/watch?v=5K5G2VkoiCs

Here are my stock main bearing pics and rod bearing pics(with plasti-gage measurements)....
http://www.ace1252.com/images/CC503_..._Bearing_pics/
http://www.ace1252.com/images/CC503_..._Bearing_Pics/

The main reason I changed the bearings was because of #1 mains condition(if I had to do one, going to do them all). Even then, no indication of pressure problems.

 

Wow, isn't that a bit of an extreme step considering he has oil pressure in the acceptable range?

Of course, the perfectionist in me would have measured all those clearances and done the bearing mix-match on assembly but I'm doubting I would pull the engine in this case.

I know we all like to see high oil pressure but the reality is that we really donb't need it to be all that high...we're just trying to 'float' the crankshaft on an oil cushion and 10psi per 1000 rpm is plenty.....

 

I wish I would have just pulled it when I changed the oil pump and learned how to check the clearances. At this point I will moniter it and see what things look like at the next oil change. I opened my first filter and nothing alarming was in it. I also have magnetic plug and after the first change not much on it. I have better than 10psi per 1000rpm until 5000rpm. I dont get above 50psi(warm). I doubt there is really much need to ever spin past 6100-6200rpm with my cam(little bigger than cc503). Plus since the tach is a couple hundred behind actual rpm I probably will be shifting at 6000. Sure I would love to see more pressure at every rpm especially high rpm but I really do think im at that place its "probably" fine lol. Honestly I wish I had taught myself how to build a motor and built this engine myself. I have the old one and it has the desireable heads for porting so chances are I may concentrate my time and money putting it together and hoping I would have it built by the time the current one gives up(was a good runner and blew head gasket at 155,000 miles.


Posted from Camaroz28.com App for Android

 

Well, he said that he sees no higher than 35psi....at anything above 3500, that is not within spec. I would certainly not feel comfortable spinning it towards 6000 with pressure that low. He needs to see 60psi@6000. I would be yanking that thing out to find out what on earth is wrong before some serious damage is done.

Edit:Well that was his spec first post....looks like he said 50psi was max now....that might be okay, but if it were me, I'd be pulling it and checking the bearing clearances. I didn't run mine hard until I figured out my pressure dipping issue.

 

correct the first pump had me maxing out at 35. The new pump I put on is stock volume with higher pressure spring. The dropping was solved by lowering oil level (must have been getting into the crank and cavitating). I would like to see sixty at 6000 but given I dont see anything funny in oil or pressure I will ride it out a little and will try a heavier oil next go and may just try that moroso filter too. If I got it to 55psi with I really wouldnt worry any more because if you think about it it would be a matter of minutes in the life of the engine that it would be over 5500rpm. Considering I started at 35 getting to 50 is a big improvement with thinner oil as mobil 1 synthetic is a bit thinner. I also get a little over 40 on cold start idle so I feel it will respond to a heavier oil.


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