Ring Gap for turbo

LeninCas · Posted: Sat Oct 03, 2015 3:33 pm Post subject: Ring Gap for turbo

I searched the forum and found that someone else with a turbo used a .020 ring gap for their top ring and a .024 ring gap for their 2nd ring.

I did MY math and according to Wiseco's chart, I should use a .018 top ring and a .020 2nd ring.

This car will see the both street and track. Should I use the numbers I found in the forums or the ones I came up with? I am using Mahle forged pistons (93.93)
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one, two, many
one too many

Howard 111 · Posted: Sat Oct 03, 2015 6:20 pm Post subject:

I went with a Total Seal second ring. It just seemed right for an engine using boost.
_________________
1973 Karmann Ghia
Turbocharged, Fuel Injected
http://www.thesamba.com/vw/forum/viewtopic.php?t=531270

SamT · Posted: Sat Oct 03, 2015 6:34 pm Post subject:

Just use the chart.

No need for total seal rings either. They work great, but the need for them is a gimmick.

Howard 111 · Posted: Sat Oct 03, 2015 7:17 pm Post subject:

What size turbo do you run SamT? What size engine?
_________________
1973 Karmann Ghia
Turbocharged, Fuel Injected
http://www.thesamba.com/vw/forum/viewtopic.php?t=531270

LeninCas · Posted: Sun Oct 04, 2015 12:49 am Post subject:

It's a Garrett T3/T4 on a 1914. Probably won't run more than 11 psi (91 pump fuel) unless Im at the track which probably wont be more than 4 times a year.
_________________
one, two, many
one too many

Eaallred · Posted: Sun Oct 04, 2015 9:00 am Post subject:

I run 22 and 24 gap on my rings with 24 lbs boost. 18 and 20 should be fine at lower boost levels
_________________
Eric Allred

You have to remember something: Everybody pities the weak; Jealousy you have to earn.

mark tucker · Posted: Sun Oct 04, 2015 9:19 am Post subject:

total seal not a gymick unless you have no brains. but then nothing will last and you blame it on something else. as for the wizeco chart...it's also for wizeco pistons.not all pistons are created equal and they retain or shed/reject heat differently. high silocon aloys tend to run hotter witch will make the ring run hotter and gap close up more.
engine labs has a good article by mahle on piston aloys, they also have a very good mahle article on piston rings....and oh so many many more performance related real articles, not internet mombojumbo bob,gene elmo said shit that was miss quoted,miss heard,miss printed,just plain missed allthe way around. and for the "oh but it's a vw crowd" the fucking engine dosent know what it is. Shocked

SamT · Posted: Sun Oct 04, 2015 12:34 pm Post subject:

SamT · Posted: Sun Oct 04, 2015 12:35 pm Post subject:

Fiatdude · Posted: Sun Oct 04, 2015 1:15 pm Post subject:

Howard 111 · Posted: Sun Oct 04, 2015 1:56 pm Post subject:

SamT · Posted: Sun Oct 04, 2015 6:19 pm Post subject:

modok · Posted: Sun Oct 04, 2015 6:50 pm Post subject:

Wiescos chart is OK!
.018 is a good minimum for top ring, and I also agree on the idea the second gap should be the same to a bit more.
This is to make sure the top ring holds compression and the second ring stays sharp.
So lets say the spec is .018-.024,
don't feel bad if you try for .018 and overshoot a thou or two.

LeninCas · Posted: Mon Oct 05, 2015 2:48 pm Post subject:

I guess I could do 18 and 20 with little boost but I do plan on using up to 22psi boost at the track with race fuel once in a while so I'll go with 20 and 24.

I've read on here that Total Seal 2nd isn't always necessary and this isn't going to be a track car only with lots of boost all the time so I don't think I will need it. If I end up getting too much blow by, I will switch to Total Seal 2nd ring next.

Thank you everyone for your help.
_________________
one, two, many
one too many

Stripped66 · Posted: Mon Oct 05, 2015 4:49 pm Post subject:

Howard 111 · Posted: Mon Oct 05, 2015 5:04 pm Post subject:

SamT, I'll bet that thing does scare you. That is so light! Have fun and be careful!
_________________
1973 Karmann Ghia
Turbocharged, Fuel Injected
http://www.thesamba.com/vw/forum/viewtopic.php?t=531270

Eaallred · Posted: Mon Oct 05, 2015 5:29 pm Post subject:

I've run BIG ring gaps before (a bit carried away with filing!) and it made zero difference. Over 0.030" gaps.

So proper gap vs. total seal? Meh.

Better the gap is a little big than a little small. Rings expand when hot and if they expand enough to touch and then some, that's when expensive stuff happens.
_________________
Eric Allred

You have to remember something: Everybody pities the weak; Jealousy you have to earn.

clonebug · Posted: Mon Oct 05, 2015 5:37 pm Post subject:

Fiatdude · Posted: Tue Sep 27, 2016 7:59 am Post subject: Re: Ring Gap for turbo

My total seal gapless 2nd rings are set at .008 gap
_________________
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For every mile of road, there is 2 miles of ditch


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