Top compression ring on the bottom?

[Mishakol129]

I just rebuilt my accord and I now realized that I probably put the top compression ring 2nd and 2nd ring on the top. They were OEM rings and I instinctively put the one labelled "T1" on the top and "T2" 2nd.


The car is running very well, like new, but could this cause problems?

[ProSouth]

What kind of compression do you have? One is the compression ring and one is the "scraper", still both are similar and are often confused. You may never see a problem since your oil ring is still on the bottom. Call your local honda dealer and see if a service writer or adviser will look it up for you. Sry that's not a real answer man.

[Mishakol129]

What kind of compression do you have? One is the compression ring and one is the "scraper", still both are similar and are often confused. You may never see a problem since your oil ring is still on the bottom. Call your local honda dealer and see if a service writer or adviser will look it up for you. Sry that's not a real answer man.

When I checked it at about 1300 miles (or maybe it was 300 i don't remember), it had 185 PSI across all cylinders. This was on a cold engine and not a WOT. I didn't take all the spark plugs out either.

What I am concerned about is what I read online. Someone said that the top ring on top cars is made stronger than the 2nd ring. For instance, the first ring takes more heat than the 2nd, 300o as compared to 600o on the top. Therefore the top maybe made from stronger materials such a moly.
But, I also heard that the "moly" is only a coating for the break in period

[ProSouth]

Holy crap, that's pretty high for a cold engine and not WOT. What kind of setup are you running? I would look at your link but I'm on my phone and don't really want to skim through an entire thread. The moly is just a coating, but I'm not sure if it wears off after its broken in. Generally removing the plugs doesn't make a huge diff. I say test it again. Warm and WOT with all plugs removed for the most Precise test. Remember to ground your coils.

[Mishakol129]

Holy crap, that's pretty high for a cold engine and not WOT. What kind of setup are you running? I would look at your link but I'm on my phone and don't really want to skim through an entire thread. The moly is just a coating, but I'm not sure if it wears off after its broken in. Generally removing the plugs doesn't make a huge diff. I say test it again. Warm and WOT with all plugs removed for the most Precise test. Remember to ground your coils.

I'm just using 0.50 OS pistons and OEM rings, nothing too extraordinary. I guess the machine shop I took it to did a really good job of boring it out. Also the cylinder valves were re-seated by a machinist after he replaced 2 burnt valves.

What does "ground your coils" mean, hook it to a battery charger?

[wed3k]

how'd you do a compression test with the spark plugs in?

[ProSouth]

he means the other 3 plugs. so you have standard sized rings and .50 over pistons. if so i'd tear the motor down. thats not a correct set up. when you go .50 over your supposed to do the same on the rings. in other words, youll have engine blow by, and incorrect ring end gap. also ask your machinist what tolerances he went by. .003-.005" should be piston to cylinder clearance on a new bore.

[Mishakol129]

he means the other 3 plugs. so you have standard sized rings and .50 over pistons. if so i'd tear the motor down. thats not a correct set up. when you go .50 over your supposed to do the same on the rings. in other words, youll have engine blow by, and incorrect ring end gap. also ask your machinist what tolerances he went by. .003-.005" should be piston to cylinder clearance on a new bore.

They're OS rings too, forgot to tell you.

[ProSouth]

ok makes more sense lol. do your test like i said man. warm, WOT with all the plugs out. sounds like your alright, honestly if you've made it (i assume by previous post) over 1300 miles.

[Mishakol129]

ok makes more sense lol. do your test like i said man. warm, WOT with all the plugs out. sounds like your alright, honestly if you've made it (i assume by previous post) over 1300 miles.

Its at 7,000 miles now

Will do, thanks for your replies. I have an oil leak though and I think that's more important to get to right now.

[wed3k]

he means the other 3 plugs. so you have standard sized rings and .50 over pistons. if so i'd tear the motor down. thats not a correct set up. when you go .50 over your supposed to do the same on the rings. in other words, youll have engine blow by, and incorrect ring end gap. also ask your machinist what tolerances he went by. .003-.005" should be piston to cylinder clearance on a new bore.

That piston to wall clearance is way off

[dj_ender]

he means the other 3 plugs. ave standard sized rings and .50 over pistons. if so i'd tear the motor down. thats not a correct set up. when you go .50 over your supposed to do the same on the rings. in other words, youll have engine blow by, and incorrect ring end gap. also ask your machinist what tolerances he went by. .003-.005" should be piston to cylinder clearance on a new bore.

.004 is the OEM MAX piston to wall clearance.

[Mishakol129]

.004 is the OEM MAX piston to wall clearance.

So is that what it means when it says the "limit" is .005 mm, .004?

The manual says the limit is .005 mm. I never knew it meant .004. Interesting.

[oyajicool]

(mm) or ( ") ????

It will be big diff.

I would have put T1 ring on top facing inscription up ward if there's no instruction telling it otherwise.

I think I had D15 engine built that way. I had my son do the work back then, so I really don't remember that part well,,,,,,,

[ProSouth]

That piston to wall clearance is way off

and you think it should be what? .003-.005 INCHES which is 3-5 thousandths of an inch is what i run on EVERYTHING. strokers, big bores, no matter what. granted, i don't build car engines every day. but per HONDA MOTOR COMPANY motorcylce, ATV, and watercraft manuals, unless its a goofy engine. they all run these tolerances. guess cars are different. sry bro
EDIT:I apologize, I do .002-.003 inches with a max tolerance of .005. Again I apologize.