using a windage tray during breakin?

[RustyRatRod]

Ok, if you are going to point out FACTS that I can’t dispute I won’t know what to do….

 

[TT5.9mag]

(A)Is there a different approach with conical or beehive valve springs?

They have less seat pressure.**

(B) An rpm limit?**


(?C)I have heard on here not only break-in above 2000 (1*) rpm (and constantly vary the rpm while doing so for about 20 minutes) but also run the engine during break-in at the rpm’s that you will use or operate the engine at.

(D)Yellow rose said (later/afterwards) to never idle an engine below 700rpm for sufficient oiling (1*so then why is running at 2000 rpm so important then?)

(E) is there an rpm limit if the engine doesn’t have the oiling mods?

(F) Any extra considerations for flat tappet cams (besides recommending going roller or solid flat tappet)?

(G) when breaking-in an engine, if we have old iron heads, should we limit seat/valve spring pressure during cam selection because we do not have hardened valve seats? I heard Mopar heads are good but other makes are a roll of the dice without hardened valve seats.


Thank you for all that contribute!!!!!!!!!

Thank you very much for the wisdom that you share!!!

A) no different approach with beehive/conical springs. But you won’t have doubles or triples with those.

They dont “have less seat pressure” as a general rule. They’re just a spring, they have the pressure they have and you can get almost any seat/open you need with em.

B) RPM limit? Not sure what you mean. For break in? You can stop worrying about RPM in all seriousness. Just don’t let it idle for break in. I keep em above 2600 or so and I run em up a few hundred rpm every once in a while during the 30 minutes.

C) see B above
D) because cams are splash oiled and you want plenty of oil on the cam for break in. He’s absolutely correct. I don’t let flat tappet stuff idle lower than about 750 after the engine is broken in.

E) I’m sure there is but you’d have to have a pretty stout engine to make power there. Again stop worrying about it. It will likely make power well below any artificial “rpm limit”. The valvetrain is almost always the mechanical limit. When you loose control of the intake valve you absolutely stop making power.

F) yes, a bottle of zinc added to your oil.

G) you’ll have a hard time finding old iron heads that haven’t been rebuilt at least once, possibly 3 or more times at this point. They’ll likely have hardened seats installed. If you do find a virgin pair, take em to a machine shop for a valve job and rebuild. They will put hardened seats in em. Either way use the springs that the cam manufacturer suggests for your cam without concern for valve seat material.

 

[junkyardhero]

And yes, I have a Milodon tray in my 8 qt Milodon roadrace pan, in the which I rarely run more than 6 qts.

i'd love to see a pic and the dimensions of that pan. i have a milodon one, but it's nowhere near that capacity. if they have a bigger one, i want it for sure.

I had to modify my OOTB Eddys for additional drainback. I just ground some channels at the firewall ends of the heads.

do you have a pic of this modification? i've heard of this, but not seen it in practice. but it just so happens that i picked up a set of heads from [old school known racer] that had some odd grinding done on them and was wondering if they were doing or trying to achieve the same thing.