Supra Engine Issue...Want your thoughts

NYSpeed Automotive
1

Just found out that my supra with what i was hoping for was a sweet good engine to build from has bad compression in one cylinder.

I have an NA 2j from the Dos that i can build and put in the car. And sell all the 7m stuff and use it towards building a pretty decent 2j.

I kinda didnt want to do that as I wanted the car to have some :snky: 7m power.

So should I bite the bullet and fix the 7m or go with the No shit, 2jz attitude?

:frowning:

Either way this is cramping the build budget and definelty putting me out of Toronto Grand Prix

2

2jz swap isā€¦ how hard and annoying?

3

just drive it slow for the summerā€¦rebuild in the winter

4

[quote=ā€œDaddie,post:2,topic:29890"ā€]

2jz swap isā€¦ how hard and annoying?

[/quote]

Its pretty involvedā€¦and bare in mind that the 7mgte in the car is ā€œbuiltā€

motor built at d&f performance
ross pistons bored .020 over
shot peened stress relieved rods
new crank bearings
new rod bearings
Toga high volume oil pump
jdm block with oil squirters
fresh head
3 angle valve job

5

Why does that engine have bad compression on one cylinder? Has it been a long time since it was bored? Was the engine not built right? Is that an indication that the build might be fucked up elsewhere too?

6

^^^^^

It could be as simple as a stuck valve or worst case someone did not know what they were doing.

Altho I am glad I am not the one who paid the 4g in machine work in the motor to find out it has bad compression.

7

pull the heasd and check the valvesā€¦if thats notā€¦drive it til it blows then worry about it

8

lolā€¦I am not gonna spend all the $ on it to make it the hp levels i want and blow it up. and risk hurting other parts.

I want to just have it right once and drive it.

9

Well then maybe figure out why thereā€™s low compression, then decide what to do? If itā€™s a quick/easy fix and the rest of the motor is already built and in the carā€¦

10

Yeahā€¦just wasnt expecting this but I think we will definetly have to answer the low compression cause before I make a decision

11

Low compression is never a quick fix, heā€™s either got a hole in the valve, a hole in the piston, or shit rings. Any way you cut it, the engine has to be torn down.

12

cant you do a leak down test with that cylinder and see what % your leaking, and listen for air leak? or put like 2cc of oil down there and try the compression test again to see if it seals the rings? maybe im wrong and confused with bikes and such

13

[quote=ā€œ2TurboZā€"]

I have an NA 2j from the Dos that i can build and put in the car. And sell all the 7m stuff and use it towards building a pretty decent 2j.

[/quote]

so if you already have this motor, why not use it?

and like chris saidā€¦a slow car is better than no carā€¦just get it running so you can have something to enjoy a little at least over the summer, and build it in winterā€¦

whats the point of working on a car all summer to drive it for a month, then just put it away for 5 months and be bored during that timeā€¦

this will give you something to do during the long cold monthsā€¦

14

Build the 7m and call it a day. It will be just as strong as a 2jz for the power level you will probably push it to.

If you want to go fast and enjoy the car, keep it simple. Donā€™t add complication to your life. Avoid all the add ons

Simplify, Simplify, Simplify

Building a 2jz is going to be expensive, stick with what you have and build upon that.

15

Stick with the 7M.

16

I say stay with the 7m like the majority in here.

Or you can sell the car and buy something elseā€¦

i kid. i kid. :slight_smile:

17

7m, donā€™t dig yourself in too deep, and keep the amount of ā€œun-neededā€ work down to a min.

Xā€¦

18

the bad cylinder only picked up 10 pts when oil was added to seal the ring.

I think I am gonna stick with the 7m and get it machined and reassembled.

Put the big turbo on itā€¦hold off on fuel and some of the other major modifications and rock it for a year as is. No fun races for me this year :frowning:

19

everybody, blow up your motor this year. all the cool kids are doing it! whos next?

and on a more serious noteā€¦keep the 7m. it would be silly to try to swap a 2j at this point.

20

[quote=ā€œ2TurboZ,post:18,topic:29890"ā€]

the bad cylinder only picked up 10 pts when oil was added to seal the ring.

I think I am gonna stick with the 7m and get it machined and reassembled.

Put the big turbo on itā€¦hold off on fuel and some of the other major modifications and rock it for a year as is. No fun races for me this year :frowning:

[/quote]

Shouldnā€™t that read put the fuel on it and hold off on the big turbo? Get it machined, assemble it, install it, run it as is stock like work out the kinks (because there will be some) and get them taken care of then mod the car. It is a pain in the ass to track down driveability issues when you start adding other variables (IE bigger turbo, more boost, engine management, larger fuel system, different ignition system) Learn the car through experience, get a handle how the car should feel and run relatively stock. Then when you are extremely familiar with the car start modding it little by little. Trust me, do this and the experience will be much more enjoyable and I guarantee you will see better results. Gary here at the shop is proof. He took his talon from a sorted out stock car to 12.0 @ 115 or so with a small turbo and sidemount. It didnā€™t happen over night but the car never ever once broke.

My $.02