Butters "Winter Upgrades". . Starting a Little Early

[Dantra]

I think a lot of those oil specs were also because of the MDS, not necessarily clearances. The MDS system was pretty picky on oil weight and would give people issues when they ran thicker stuff at least from what I recall reading. Not that bearing clearances couldn't play into that, but I know a lot of the banter came from MDS. Bearing material might have something to do with the clearances as well, but I'm by no means an expert or even all that well versed in bearings. Modern street cars tend to run aluminum bearings though, which I could see maybe having tighter clearances due to being marginally softer maybe?

You're right.. tighter clearances for thinner oil to keep that system happy. But on the flip side.. not all had MDS, but kept the same spec. Lighter oil is also more efficient etc

 

[Dantra]

Interesting. I'll admit, I know nothing about all the varieties of bearings. I did just watch a Steve Morris video where he spoke about bearing clearances. He had one a touch big or small (don't remember) so he was ordering the next size up and only planned to use half of it. This would essentially give him the clearance ne needed. I've never heard of mixing bearing sizes, but if anyone knows, it would be him. But he also builds 4000HP engines that get torn apart very often. Might not be a good idea for a street engine. Do you know what the clearance is on a factory 6.4?

Back to this.. I tried my new dial bore gauge last night. It's sensitive! 10 marks on it are equal to 1 mark on my other gauge. What I was coming up with was right around .0018.. maybe .0017. But I did compare every weapon of measurement that I have.. my .001 db gauge, .0001 db gauge, .002-.005 red plastige and the .001-.003 green plastigage. Really splitting hairs across the board. They're all close to each other but minute differences. Maddening! I have to trust the .0001 db gauge, since it's the most accurate. I've got a set of +.001 bearings hitting the door today and a set of 6.4 std hitting the door Saturday. I really hate that I can't use what came with the kit but it is what it is. Even if they were the right gap, they're still not the correct 2 hole 6.4 version. Even tho they'd probably be fine, my brain just would not accept it. I'll wait for the standards to hit, install them and check the gap. If they are still reading under .002, I'll have to do the split bearing and use the lower halves of the 1 over set. Right now, if used a 1 over with these readings, it would put me above 25. With a little luck (pfft) I wont need to open the 1 over set. So $300 later (not including the set I returned and awaiting credit, hoping to not get dinged for a restock fee)... I might get this thing buttoned up. Still have the daunting task of gapping rings. Rod bearings seem to be in spec.

 

[DionR]

Ahh ya know, you're right. They did make 3 & 4 bolt. I think there's a break there and then another break for 32 and 58 tooth.. I could be wrong. Too many rabbit holes haha

And then a third break when the 58 tooth ring changed again.

The later sensor can't read the earlier 58 tooth ring, but the early 58 tooth sensor can read the later ring, so there is that advantage.

 

[Dantra]

And then a third break when the 58 tooth ring changed again.

The later sensor can't read the earlier 58 tooth ring, but the early 58 tooth sensor can read the later ring, so there is that advantage.

Yup.. teeth got taller around 12/13.