Update??? How's it looking for making PP 2022?
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Rome wasn’t built in a driveway...you got this.
RUSH55
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- #2,644
Still a bunch of painting and coating to do before assembling doors and installing glass. Kinda waiting for it to warm up some more and the wind to stop blowing so much before really getting back into that. The engine block, heads, rods and pistons are nearly done at the machinists place. He also picked up some other parts for me as well. He sounded pretty impressed with the headers. Oil pan is here. Updates should start trickling in more pretty soon.
RUSH55
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I cant wait to get rid of my extra rig!
PabloCruise
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Nice to have friends with cranes!
RUSH55
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Engine block, heads, and rods with new pistons are back in my garage. Machinist was able to get away with a .020” over bore. Heads and valves were all cleaned up with a new set of springs installed.
He also picked up most of the internal replacement parts I need - oil pump, timing chain, lifters, gasket and seal kit.
Need to acquire a few more odds and ends before beginning the build up.
He also picked up most of the internal replacement parts I need - oil pump, timing chain, lifters, gasket and seal kit.
Need to acquire a few more odds and ends before beginning the build up.
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Wow!
That thing is going to be a new upgraded rig by the time you are done!!!
That thing is going to be a new upgraded rig by the time you are done!!!
RUSH55
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- #2,652
Getting there….
Was hoping to knock out a few more things before updating, but I’ll go ahead with what I have and throw out this little snag and see if you have any experience in this department…
Cam bearings are in! Wooo!
Spent several hours over the weekend cleaning the block up the rest of the way.
Wanted to get rings installed on the pistons last night so started doing an end gap survey. I have specs for end gaps for the OEM bores. The rings picked up by the machinist have end gaps much larger than the OEM specs.
After rechecking the bores and piston diameters the average bore is now 3.7995” which comes out to be about.020” over. The rings he picked up are also for a .020” overbore. There’s no end gap specs in the box that the rings came in, so I’m pretty much at a loss now for what they’re supposed to be.
The specs for the top ring at OEM bore is .009” - .018”.
The new top ring measures out (on cylinder #1) at .024”.
Specs for the second ring say .017” - .027”.
I got a gap of .035” on the second.
Searched around for a bit trying to find any info saying either the gaps should stay consistent or they should be larger due to the increase in bore size, but so far haven’t found anything. Was planning on calling the machinist today to see what he says.
Was hoping to knock out a few more things before updating, but I’ll go ahead with what I have and throw out this little snag and see if you have any experience in this department…
Cam bearings are in! Wooo!
Spent several hours over the weekend cleaning the block up the rest of the way.
Wanted to get rings installed on the pistons last night so started doing an end gap survey. I have specs for end gaps for the OEM bores. The rings picked up by the machinist have end gaps much larger than the OEM specs.
After rechecking the bores and piston diameters the average bore is now 3.7995” which comes out to be about.020” over. The rings he picked up are also for a .020” overbore. There’s no end gap specs in the box that the rings came in, so I’m pretty much at a loss now for what they’re supposed to be.
The specs for the top ring at OEM bore is .009” - .018”.
The new top ring measures out (on cylinder #1) at .024”.
Specs for the second ring say .017” - .027”.
I got a gap of .035” on the second.
Searched around for a bit trying to find any info saying either the gaps should stay consistent or they should be larger due to the increase in bore size, but so far haven’t found anything. Was planning on calling the machinist today to see what he says.
Is that Greek you are writing?
Larger second ring gaps help any pressure that gets past the top ring to be able to effectively escape into the crankcase. It should be larger than the top ring. Here's an article discussing some different aspects of the second ring vs top: https://www.enginebuildermag.com/2019/04/what-does-the-2nd-ring-really-do/
EDIT: I may have misread your original post. I thought you were questioning the different gap sizes between the two.
EDIT: I may have misread your original post. I thought you were questioning the different gap sizes between the two.
So, the new rings are tighter than oem with the 20 thou added, right. Maybe they made them that way in order to file down to where you want the gap?
, sorry I was adding 20 to the new rings , too. Good I'm glad you got that figured.
RUSH55
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- #2,660
Some more meandering details for the thread…
Even though Jim the machinist thinks a .024” gap is OK, I’m under the impression that a stock set of rings ended up in a box marked for .020” over. Found two instances so far verifying that the proper gap should be in the .014” - .018” range. Gonna go ahead and just buy another set of rings and see what happens.
Also bought some ARP rod bolts to replace the OEM’s. Getting drowsy just thinking about how much better I’ll sleep at night having that done.
Even though Jim the machinist thinks a .024” gap is OK, I’m under the impression that a stock set of rings ended up in a box marked for .020” over. Found two instances so far verifying that the proper gap should be in the .014” - .018” range. Gonna go ahead and just buy another set of rings and see what happens.
Also bought some ARP rod bolts to replace the OEM’s. Getting drowsy just thinking about how much better I’ll sleep at night having that done.
