1G ENGINE REBUILD

4G63Tlove · Oct 17, 2015

Okay guys so I got myself a 1g with 84k miles and this Mods
20g turbo
Hks wastegate
Intake English racing front mount Intercooler
Apexi Boost Controller
Down pipe n cat back

I did a compression test and here are the results
1.120 2.90 3.120 4.120
So cylinder 2 is really low and I thought dsm had 164 across and I don't know if the previous owner did a low compression build or what but anyways
I just want to rebuild the engine I want to leave the head stock and just rebuild the button to oem specs because I know they can hold 400 to 450 reliable. What do you guys think?

u lost · Oct 18, 2015

1G (90-94) T/E/L 2.0L Turbo engine
Compression ratio 7.8:1
Standard compression 164 psi
Service limit 121 psi

A rebuild wouldn't be a bad idea..the stock parts can go a long way..if your upgrading make sure your have a good tune.And keep up service maintenance it goes a long way

It is strange that a engine with low miles has compression that low.Are you sure you are testing it correctly?

BogusSVO · Oct 19, 2015

A leak don needs to be run... it could be a slight bent valve in #2 causing low compression.

edged1g · Oct 19, 2015

BogusSVO said:
A leak down needs to be run... it could be a slight bent valve in #2 causing low compression.

True, but seeing as how the other 3 cylinders are below the service limit I would bet a "refresh" is in the OP's future.

4G63Tlove said:
I just want to rebuild the engine I want to leave the head stock and just rebuild the button to oem specs because I know they can hold 400 to 450 reliable. What do you guys think?

A good OEM rebuild is not a bad method. Make sure you have the head freshened up at the same time. Also, I'd recommend getting a good set of forged pistons and trash the OEM cast ones. They are the weak link in the bottom end (*assuming 6 bolt). The rods and crank are solid.

BogusSVO · Oct 19, 2015

Its a waste hanging forged pistons on stock rods, 6 bolt or otherwise,

With a 20g and decent tune, the NPR 63DT will support that.

The reason the other 3 cylinders could be low , is bigger cams and/or the timing belt off a tooth.

At 84k miles, The timing belt was changed once.

Pull the balancer and front cover line up the crank marks, then check the cam marks.

edged1g · Oct 19, 2015

I disagree with your first statement but I don't want to get into an argument.

The 3rd and 4th statements could be true but nothing in the original post said anything to suggest that. Seems like pure conjecture. :idontknow:

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1G ENGINE REBUILD

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