North American Turbocoupe Organization



Rings?
Blade1433 Offline
Senior Member
#1
My car doesn't need rings but I'm about to start an engine rebuild(hopefully) and the block needs rings. To the best of my knowledge, it hasn't been rebuilt so the pistons are stock size. If the bores aren't scored can I just have it honed and put stock size rings back in? Or, if they are mildy scored, could I have it bored .010" over and just get new rings to avoid having to purchase new pistons?

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Blade

"Drive it like you stole it"

88 bone stock TC with 138k, 5spd, burgundy, almost all options with new U-joints, tranny Xmember, front end, FULL tune-up with select MSD products, new horizontal axle shock thingies, custom interior, white face guages. Coming soon: boost guage and air fuel ratio guage on the pillar, Gillis valve, K&N, gutted upper, knife edged lower, gutted E6, T3, and steam cleaned engine bay.
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sctur601 Offline
Member
#2
DONT HONE IT .010 UNLESS YOU ARE GOING TO GET NEW PISTONS!!!!! The engine wil destroy itself very fast. Measure the bores If the bores are still in good shape and still has most of the hone marks I would just leave it or if you are really set on rings in get a set of moly rings and either have the engine profesionally honed or dont hone it at all. Most of the cheap cylinder hones that you can rent or buy have the wrong grit stone and can make the rings not break in correctly. With 138K on the engine it should still be in OK shape. Good luck
Shawn

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My vehicle
1983 Turbo Coupe-
13.83 at 103mph!
273rwhp and 342ftlb at 24 psi with a slipping clutch!
And it still feels slow!
Thanks
Shawn

Please click the link if you want to sign my aftermarket head list

[This message has been edited by sctur601 (edited 01-01-2002).]
My vehicle
1983 Turbo Coupe-
13.83 at 103mph!
273rwhp and 342ftlb at 24 psi with a slipping clutch!
And it still feels slow!
Thanks
Shawn

I also do port work, if you need something ported email me at [email protected]
Reply

Pete D Offline
Administrator
#3
The bores have to be measured. If there is little or no ridge at the top of the cylinder
that might be an indication of the amount of wear but not a substitute for measuring the bores in six locations each. Bores do not wear "straight" up and down, nor do they wear "round" If an overbore is needed, you cannot reuse the stock pistons. For our engines the smallest overbore you can get pistons for is .020 over (that I know of)


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NATO Member
88 TC X 2, 86 SVO, Main TC with K&N, 3"DP to 2.5"duals through Dynamax, Ric valve at 17+ and disconnected KS.
Elite Bodega 16" chrome wheels. Autometer pod w/ A/F and Vac/boost gauges.140 mph Motorsports Speedo New engine: Total Seal rings and TRW pistons, ported and polished head w/ cc'd chambers,1.59"exhausts, SS valves, gutted upper, knife edged lower, A-230 cam, Race Engineering Adj Cam Sprocket, Crowlers, ARP head studs, and rod bolts. Walbro 255 HP pump and Kirban adj FPR, T-3. Centerforce II, KB subs and jack rails.
Pete Dunham


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sctur601 Offline
Member
#4
What he said [Image: smile.gif]

[This message has been edited by sctur601 (edited 01-01-2002).]
My vehicle
1983 Turbo Coupe-
13.83 at 103mph!
273rwhp and 342ftlb at 24 psi with a slipping clutch!
And it still feels slow!
Thanks
Shawn

I also do port work, if you need something ported email me at [email protected]
Reply

Blade1433 Offline
Senior Member
#5
Sctur, it's not the engine in my car, it actually has less mileage. I think I need to rephrase my question. Umm, my question is... if the bores aren't too out of round, and the cross hatch is still ok, do I have to hone it? If I don't have to hone it, can I just just new stock size rings? I also wasn't going to do it myself, I'm not stupid. I was going to take it to a local shop. Will honing it remove enough excess of material to require new, expensive, over size pistons and rings?

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Blade

"Drive it like you stole it"

88 bone stock TC with 138k, 5spd, burgundy, almost all options with new U-joints, tranny Xmember, front end, FULL tune-up with select MSD products, new horizontal axle shock thingies, custom interior, white face guages. Coming soon: boost guage and air fuel ratio guage on the pillar, Gillis valve, K&N, gutted upper, knife edged lower, gutted E6, T3, and steam cleaned engine bay.
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sctur601 Offline
Member
#6
Did the engien have good compression do you know? Personally I would pull the head check for a ridge, and check the cylinder walls for scratches and honemarks. If it looks ok I wouldnt even pull the pistons out. Check the bearings for scratches and use plasti guage to measure clearences. If it checks ok just leave the bearings too. Well I guess it really depends on what you plan on doing with the engine but if its just going to be a street car, I would just spend the money on the head, intake, exhaust, and turbo. These engines really are alot tougher and longer lasting than most people realize. I have a friend that has 380,000 plus mile on his car and just barely blew the head gasket! This engine just barely had a ridge and still had most of the hone marks. He just put on a ported stack valve head, ported intake and exhaust manifolds and a full 3" exhaust, he is running 14.70 at 92mph! this is on a 380,000 mile short block! It has only run synthetic oil though. When you get it apart tell us whats going on, and how it looks. have fun building that sucker!
Later
Shawn

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My vehicle
1983 Turbo Coupe-
13.83 at 103mph!
273rwhp and 342ftlb at 24 psi with a slipping clutch!
And it still feels slow!
Thanks
Shawn

Please click the link if you want to sign my aftermarket head list
My vehicle
1983 Turbo Coupe-
13.83 at 103mph!
273rwhp and 342ftlb at 24 psi with a slipping clutch!
And it still feels slow!
Thanks
Shawn

I also do port work, if you need something ported email me at [email protected]
Reply

Blade1433 Offline
Senior Member
#7
It's JUST the block and rotating assembly so I can't do a compression test. I won't know anything for sure
untill I take it apart


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Blade

"Drive it like you stole it"

88 bone stock TC with 138k, 5spd, burgundy, almost all options with new U-joints, tranny Xmember, front end, FULL tune-up with select MSD products, new horizontal axle shock thingies, custom interior, white face guages. Coming soon: boost guage and air fuel ratio guage on the pillar, Gillis valve, K&N, gutted upper, knife edged lower, gutted E6, T3, and steam cleaned engine bay.
Reply

Chuck W Offline
Posting Freak
#8
I'm not going to get in on the hone or not to hone question, but I will recommend Total-Seal rings when/if you replace them. You can also get them in a file-to-fit version so you can fine tune the ring "gaps" to what your block requires.

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The Cat in the birdcage...
83 TC Clone, 80 Cougar XR-7, 85 Volvo 244 Turbo, AND 88 Scorpio
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