Clearances on short block internals.

[05stroker]

Onto ring gap. For a boosted application. Does top ring .022 to .024 and the 2nd ring .012 to .014 and the oil ring .035 to .080 sound correct? I would rather make sure than just taking the word of someone that someone told.

Those are the same top and 2nd ring specs I came up with useing Manleys chart for there rings and pistons. I set mine to the loose end of those #s at .024/.014/.035.

 

[US-1]

 

[05stroker]

If thats incorrect then now would be a good time to know . That is there spec.

 

[Freaknazty]

You're kidding.....right?

Look above , I said it was just for picture reference come on man I know better than that . I mean shit he's building a motor with harbor freight tools .

 

[US-1]

Look above , I said it was just for picture reference come on man I know better than that . I mean shit he's building a motor with harbor freight tools .

I know.....horrifying.....isn't it!

 

[tmcolegr]

Not trying to stick my nose in someone else's thread but when I called JDM to ask this very same question about the 298 forged stroker rotating group I purchased from them, their engine builder suggested the following ring end gaps for the Total Seal piston rings in my F/I application:

• Top Ring - .022" (1.5mm Wide Chrome Steel Barrel Face Ring)
• 2nd Ring - .024" (1.5mm Wide Cast Taper Face Ring)
• Oil Control Ring - .015" min. (3.0mm Wide 3 Piece Stainless Steel Scraper)

I realize that end gap spec. for the 2nd ring is contrary to what the ring manufacturer recommends.

 

[05stroker]

Those are the same top and 2nd ring specs I came up with useing Manleys chart for there rings and pistons. I set mine to the loose end of those #s at .024/.014/.035.

I went back and looked at my notes and the oil rings were at .020 .

I called Manley today and they stated the same specs that I quoted before . I then called a few builders and they were all very close at .020-.022 on the 1st ring , .022-.024 on the 2nd and .015 -.020 on the oil ring.

Its pretty bad that Manley recommended these specs I quoted for a blown gas engine when this is known to so many builders to be incorrect.

 

[Natural1]

I called Manley today and they stated the same specs that I quoted before. Its pretty bad that Manley recommended these specs I quoted for a blown gas engine when this is known to so many builders to be incorrect.

Well they aren't always correct..

I then called a few builders and they were all very close at .020-.022 on the 1st ring , .022-.024 on the 2nd and .015 -.020 on the oil ring..

Those numbers look familiar....

 

[US-1]

Not many people know about gapping the second ring bigger on a modular. Just one of those things. Depending on who you talk to at a piston or ring company you might get the "book answer" or you just might get lucky.