rings and bearings question

joel w · 11-02-2005, 06:09 AM

ok i was just wondering if anyone here has ever had bad "ring" or "bearing" in the 7m-gte motor. if so what kind of boost psi were you running at the time and some of your mods?

j.

rnoswal · 11-02-2005, 07:55 PM

Explain "bad" !

Russ

joel w · 11-02-2005, 10:14 PM

On the rings i mean bad as in a broken piston ring or excessivly warn with alot of blow by or low compression even..

and on bearings, bad as in a spun bearing, or rod knock

opposite of good!! hehehe

rnoswal · 11-03-2005, 04:18 AM

Well when the word bad is used like that, then it sounds like not good. Problems like that are usually a worn out engine. Low oil caused spun bearing due to hard seals and oil loss. Broken rings mostly just fatigue along with heat and maybe even detonation.

Either way, engine rebuild time and with proper care and only occasional runs up to 6500 rpms and 140 mph it should last another 200 thousand miles.

Russ

joel w · 11-03-2005, 08:20 AM

ya im not having any issues yet, just wondering if you have experienced any of these problems yourself, , trying to see how often they occure, in what situations?? im upgrading to full 3" dp w/catless sytem here ina few days and im wondering how close i am to pushing the limits of the stock block on hp. I should be close to 350+- hp or so..
just for my own twisted amusement wondering how tuff these 7mgte's are stock, at what point does it break.rings, pistons, bearings,. i see these vids of guys hitting and holding rev limiter before launching off the line. amazed they hold together this well. amazed mine is still strong after all my abuse and milage....

also, russ, i took your advise and helicoiled all 7 exhaust studs yesterday, all but 2 were pulling there threads out of the head. worked like a champ, tyty

rnoswal · 11-03-2005, 02:27 PM

You are welcome. It seems that Toyota builds some very strong stuff, but you pay the price looking for aftermarket stuff because they are expensive. I think somewhere lately people have been posting horsepower ratings with the type engine, but it seems I have heard at least 500 reliable horses and maybe more with the 7M block.

The engine just has to built with a lot of care to make sure you don't blow a head gasket, but that is true with any engine looking at the kind of hp or more. These engines come stock with forged cranks and very tough and well built blocks. The pistons and rods are what needs to be changed with the high end hp. The heads seem to be up to it and with the correct fuel mixture and a good cooling system the high horsepower should be reliable too.

Do a search to find what can be had horsepower wise and what mods were done.

Russ

Burn N' Up · 11-03-2005, 06:06 PM

Did you helicoil the exhaust studs because of all the boost your running? Were they pulling out or what?

joel w · 11-04-2005, 03:42 AM

i had 2 that felt like they stripped when i put it together few yrs ago and recently it seemed to have loosened up and when i tried to tighten up the others puled the threads, boost probly helped shake em loose ya but i think it would done either way.

11-02-2005, 06:09 AM	#1
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	rings and bearings question ok i was just wondering if anyone here has ever had bad "ring" or "bearing" in the 7m-gte motor. if so what kind of boost psi were you running at the time and some of your mods? j.

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11-02-2005, 07:55 PM	#2
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	Explain "bad" ! Russ

11-02-2005, 10:14 PM	#3
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	On the rings i mean bad as in a broken piston ring or excessivly warn with alot of blow by or low compression even.. and on bearings, bad as in a spun bearing, or rod knock opposite of good!! hehehe

11-03-2005, 04:18 AM	#4
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	Well when the word bad is used like that, then it sounds like not good. Problems like that are usually a worn out engine. Low oil caused spun bearing due to hard seals and oil loss. Broken rings mostly just fatigue along with heat and maybe even detonation. Either way, engine rebuild time and with proper care and only occasional runs up to 6500 rpms and 140 mph it should last another 200 thousand miles. Russ

11-03-2005, 08:20 AM	#5
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	ya im not having any issues yet, just wondering if you have experienced any of these problems yourself, , trying to see how often they occure, in what situations?? im upgrading to full 3" dp w/catless sytem here ina few days and im wondering how close i am to pushing the limits of the stock block on hp. I should be close to 350+- hp or so.. just for my own twisted amusement wondering how tuff these 7mgte's are stock, at what point does it break.rings, pistons, bearings,. i see these vids of guys hitting and holding rev limiter before launching off the line. amazed they hold together this well. amazed mine is still strong after all my abuse and milage.... also, russ, i took your advise and helicoiled all 7 exhaust studs yesterday, all but 2 were pulling there threads out of the head. worked like a champ, tyty

11-03-2005, 02:27 PM	#6
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	You are welcome. It seems that Toyota builds some very strong stuff, but you pay the price looking for aftermarket stuff because they are expensive. I think somewhere lately people have been posting horsepower ratings with the type engine, but it seems I have heard at least 500 reliable horses and maybe more with the 7M block. The engine just has to built with a lot of care to make sure you don't blow a head gasket, but that is true with any engine looking at the kind of hp or more. These engines come stock with forged cranks and very tough and well built blocks. The pistons and rods are what needs to be changed with the high end hp. The heads seem to be up to it and with the correct fuel mixture and a good cooling system the high horsepower should be reliable too. Do a search to find what can be had horsepower wise and what mods were done. Russ

11-03-2005, 06:06 PM	#7
Burn N' Up 3" Exhaust Join Date: Sep 2005 Posts: 238	Did you helicoil the exhaust studs because of all the boost your running? Were they pulling out or what?

11-04-2005, 03:42 AM	#8
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	i had 2 that felt like they stripped when i put it together few yrs ago and recently it seemed to have loosened up and when i tried to tighten up the others puled the threads, boost probly helped shake em loose ya but i think it would done either way.