7mgte 2 blown cylinders

NoRush · 10-04-2005, 06:32 PM

I have 89 supra turbo, but it has 2 blown cylinders. I was wondering what my best option was.

it to bour them out and switch to bigger pistons
buy a new block
or just fix the 2 cylinders

thx

SupraMan1784 · 10-04-2005, 08:19 PM

unless u want to make some large insane amount of power...theres no need to realy switch to bigger pistons....bigger pistons on a stock engine will theoretically slow you down...more mass...more energy to move that mass, so thats kind of useless, though depending on the extent of the damage...if minor you can bore it or have it ported, but if it is major damage i recommend getting a new block...since itll be the safer route....

rnoswal · 10-04-2005, 08:54 PM

Just curious by what you mean by blown cylinders. If the block can be bored out and make it usuable again then go for it. You will have a little heavier pistons granted, but the new the rings will be working in a perfectly round hole again and the weight difference will be offset byt the power you make. The say you can't beat cubic inches. I can pretty much guarantee you won't be gaining more than a few grams per piston, but that is why they make oversized pistons.

Make sure the cylinder isn't cracked anywhere though, your machine shop can do that for you. If it is, then is the time to look for another block. Since you may be looking at bigger pistons then maybe you might want to go for a more performance oriented piston, forged perhaps. This is a good time to have the block decked and the head checked out and made flat again.

It is never good to just fix a cylinder or two with these engines. If you are talking sleeves then that is an option, but they don't alway work. That is the time to find another block or another type engine for that car.

Let us know about what happened with the "blown " cylinders.

Russ

suprra_girl · 10-05-2005, 08:04 AM

^ good answer!!!

rnoswal · 10-05-2005, 04:01 PM

Thanks, that really means a lot!

Russ

10-04-2005, 06:32 PM	#1
NoRush Stock Join Date: Oct 2005 Posts: 3	7mgte 2 blown cylinders I have 89 supra turbo, but it has 2 blown cylinders. I was wondering what my best option was. it to bour them out and switch to bigger pistons buy a new block or just fix the 2 cylinders thx

10-04-2005, 08:19 PM	#2
SupraMan1784 SP58GT Join Date: Jun 2005 Location: Dirty Jerz Posts: 691	unless u want to make some large insane amount of power...theres no need to realy switch to bigger pistons....bigger pistons on a stock engine will theoretically slow you down...more mass...more energy to move that mass, so thats kind of useless, though depending on the extent of the damage...if minor you can bore it or have it ported, but if it is major damage i recommend getting a new block...since itll be the safer route.... __________________ Now: Saving for an MKIV Broken Rides: (Sold) 91 supra turbo 5speed with a 1jzgte motor 421whp 400(399) ft*lbs of torque on tap @ 15 psi "Always outnumbered, never outgunned."

10-05-2005, 08:04 AM	#4
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	^ good answer!!! __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

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10-04-2005, 08:54 PM	#3
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	Just curious by what you mean by blown cylinders. If the block can be bored out and make it usuable again then go for it. You will have a little heavier pistons granted, but the new the rings will be working in a perfectly round hole again and the weight difference will be offset byt the power you make. The say you can't beat cubic inches. I can pretty much guarantee you won't be gaining more than a few grams per piston, but that is why they make oversized pistons. Make sure the cylinder isn't cracked anywhere though, your machine shop can do that for you. If it is, then is the time to look for another block. Since you may be looking at bigger pistons then maybe you might want to go for a more performance oriented piston, forged perhaps. This is a good time to have the block decked and the head checked out and made flat again. It is never good to just fix a cylinder or two with these engines. If you are talking sleeves then that is an option, but they don't alway work. That is the time to find another block or another type engine for that car. Let us know about what happened with the "blown " cylinders. Russ

10-05-2005, 04:01 PM	#5
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	Thanks, that really means a lot! Russ