And what did you set both your gaps to?

 

I did not set them yet as I am still waiting to bring my block to the machine shop to get bored and honed. Having a baby definitely limits my time.

 

Needless to say... I just went and spent a few hundred dollars on those "piston ring squarers". Thanks for the link.

 

Lol.. yea I didn't know that's all they were till I looked them up.
top ring .02"
Second ring .024"
So does that sound good for my gap?

 

Anyone? I need to do this tonight

 

 

Wish you luck, Is that a TAD on the tight side? I guess that's what your trying to figure out because it's not a track only race car. Hope you get some professional answers.

 

84.5 and supertech recommend .0045 for street performance (bore in inches x .0045 = top ring gap), came to .015 for the top ring, and .018-.019 for the second ring, and i allow .001 between all of them. I had one that was .014 and one that was .016. For the most part supertech's rings are usually perfect right out of the box as long as your machine work is good.

 

I'm pretty sure its on the loose side but I don't really have a choice with how the measurements came out for the sexing ring without gaping anything

My machine work is perfect. .004" p2w 3.21" total bore each cylinder. As you can see from the measurements I got the rings have a lot of variance in numbers. And my second compession rings came really loose but I've seen a lot of people with the same problem. There's no way my ring gap can even be close to yours. I will be measuring the ring gaps again just to make sure before gaping them.

Im thinking going with
Top ring .019"-.02
Second ring .024"

Now is that to loose and give me any problems? As I said I don't really have a choice on going any tighter on the second compression ring.

 

Sounds good to me, I say put that bad boy together and get on with the boosting

 

Exactly my thoughts.

 

Thanks guys that's what ill be going for

 

.020 is way too loose for me imo

 

What would be better for the top? I have to go that loose on the second one and shouldnt there be a .004 difference in the rings

 

these are supertech rings right? have the following list here on measurements for my supertech ring sheet...

x factor

street performance .0045
moderate turbo/nitrous .0050
drag/overal track .0055
turbo/nos race only .0065

the calculation is bore in inches x factory = top ring gap

the second ring calculation is first ring gap x 1.25 = second ring gap

so...

with the measurements your showing on you rrings your gonna be setup between drag/oval track and race only ratings for the ring gap, remember these gaps are meant to account for the heat build up as the rings expand, race cars run constant WOT so the heat build up is much higher. On a street driven car that would just be way too loose.

With the measurement you posted 3.21 for bore size your gaps should be...

.016 for the top ring and
.020 for the second ring

and thats for moderate turbo/nitrous setup

thats what i would run, no way i would run the top ring gap at .020 for me personally, you would bleed off too much compression on a street car

 

Yea those are the measurements I had first to but none of my second compression rings are smaller then .023" so I don't really have a choice to run those gaps

 

are you sure you have the right ones for the 1st and second rings? the chrome one is the top ring and the dark one is the second ring

 

Yes I'm sure

 

id be sending them back and getting a new set of rings to be honest, no way i would run them that loose

 

Spawne, His target goal is 400-500hp. I dont think thats a moderate turbo category in my opinion. I would recommend multipliers of .006 top / .0065 middle x bore.

That works out to be .019" top and .021" second ring gaps.

However your second rings unfiled are larger than your intended target gap. This is very common. I’ve seen this in multiple ring sets from CP and Wiseco too. The second ring isn’t very important as long as it's gap is larger than the top ring to prevent ring flutter. Just make the second rings all the lowest common denominator, .024". Or just leave em as is. You can try and get new rings, postpone your build another week but the new ring set will probably be the same.

 

moderate turbo 3.21 x .0050 = .01605
full drag 3.21 x .0055 = .01765
RACE ONLY 3.21 x .0065 = .02086

 

You feel the categories are geared more towards time under load vs total power? To me it would seem more of a combination of the two. What category would you put 600hp street car?

 

Moderate turbo, the ring gaps are determined strictly by heat generated as the piston expands, the differences in gap are accounted for how long the periods are for prolonged WOT. You just wont see that on a street car. Short bursts of WOT wont generate the kind of expansion that those wider ring gaps require.

 

and to clarify further, if he was at say .017 or .018, i would say **** it, just run it, but were talking .020 on the TOP ring and .024 on the second ring, no ****in way.

 

The top rings are in that range. The second rings are just .024". So I was saying to put the tops at .02" to be .004" difference in the 2 ring gaps