4g63 Turbo Knock Rebuild

[dpuddy]

Ok so right now I am have a 91 talon non-turbo beater. I am looking a getting a 93 TSI for 1000. Everything is great on it except for the engine, it has a knock. I don't know anything specific about the knock. I want to go look at it tomorrow and get a better idea of the car.

I know that the internals of the 4g63 non-turbo and turbo engines are just about identical. Since I am not looking at doing anything over the top with the car I think I should be able to rebuild engine with the 91.

I was thinking putting a turbo in my 91 but its going to cost around the same and in the end I will still have a FWD plus theres other problems with the car as well.


So, to my question, do you think I should be able to get rid off the knock with the parts off of my 4g63 non-turbo engine?

Thanks for your time, any input helps,
-Dylan

 

[duggyb]

well i am not an expert but i was pretty sure the non-turbo motors dont have forged internals?
if so the turbo motors do right?

so you would be swapping unforged for forged and throwin boost an low end internals...which would not turn out so great if you ever cranked the boost up any.

this is all speculation as i am still a DSM noob...someone will chime in with better info tho.

goodluck!

THNX
Duggy

 

[anteversion]

Knock is not generally a word used to describe a physical problem that an engine can have. Knock is the result of detonation in the combustion chamber of the engine head. It is mostly caused by A/F ratio and timing, wich cause temp to reach too hot level in the chamber. If you use the word knock to identify a sound that your engine make, you should be more precise about the aera and the symptoms and things like that.

1g NT pistons are not the same than turbo's ones. the compression ratio is different:
1G turbos are 7,8:1
1G nt are 9,1:1

You can run the 9,1:1 in a turbo setup but it's not the best way to go. The thing is due to the higher compression ratio, it will produce more heat in the combustion chamber and as described earlier, will cause more detonation and KNOCK. so it will restrict you in the amount of boost that you will be able able to run. but in the range of 10-15 psi you will be fine

 

[dpuddy]

I know that the pistons are not the same, sorry I should have said that. I have not heard the engine for myself, the guy selling is saying it "knocks". I am not planing on boosting much more that 15psi with the engine. I will be keeping most of it stock for a while.

 

[4g63Powered]

Try and get more info from the guy. If he's not big into DSMs or FI'd cars, he might say "knock" meaning rod knock. If you rebuild the engine, you could use the same pistons/rods again, just with new bearings, which you would uy anyways.

 

[dpuddy]

Any one else with any info?