4g64/g4cs

[iTSaTSi]

Alright, so I'm fairly new to DSM's (former Subaru guy) and I see a lot of people using 4G64 and G4CS engines. Whats the advantages of these over a 4G63, and main differences. Can you interchange certain parts? Thanks in advance.

 

[miguelmcv]

I don't want to be a D***, But this question has being answer so so many times.

Just make a search about each of them and compare all of them, a G4cs is the same as the 4G64, But it's a 6 bolt, G4cs (6 bolt) 4g64 (7 bolt).

4g64.---- More power (Spool), Less rev.
4g63 ---- More Rev, less Power (spool).

Good Luck.

 

[Cornfed4G64]

x2

you can make good power with the 2.0 just stick that route. After all the money spent on the 2.4 build its just easier to do a 2.0. I have a 2.4 broke the crank and took two months to find one. (I DIDN'T LOOK HARD BUT STILL) I have the G4CS block.

 

[iTSaTSi]

Thanks a lot for the replies, the only other thing I was wondering is if the 4G64 is as prone to crankwalk as the 4G63

 

[ThunderChild]

Thought this was the newbie forum, so no telling to search. But I see where ## coming from

Anyway, I'm gathering parts for a 6 bolt 2.4 build up, and as far as I've seen, the only difference between a 6 bolt 2.0 vs 2.4 is displacement, oil drainback holes in the deck, and knock sensor boss needing drilled if u want it in the same spot as the 2.0. They both have the same rods.

I don't see the huge difference in builiding cost, other than the pisons ### they r custom. Don't turn the crank, they break usually so just polish if u can. I

If u want more info pm me and ill try to help as much as I can. The 2.0 will be more straight forward and u can definitely make great power. I'm just doing it ### I got a smoking deal on it and I like tq.

 

[Cornfed4G64]

Correction pistons are not custom. Many companies sell 86.5mm and 87mm pistons. Cost is the same to build yes, but finding parts for the 6 bolt 2.4 is harder than the 6 bolt 2.0 is what I was saying

Like the kid said before
2.4 good spool/low rev
2.0 slower spool/higher rev

CRANKWALK IS OVERRATED I wouldn't worry about it. Odds are the motors you will find will have high mileage and haven't walked yet so they probably never will.

 

[ThunderChild]

True, ill retract "custom", but u can't buy a factory piston that would work the a turbo app. They are all aftermarket forged to my knowledge. So the cost could potentially be more than a 2.0.

And yes, conventional thought says a stroker can't rev as high. But I think that's a misnomer. Just because your stroke increases doesn't mean your respond and efficiency goes down. That is more reliant in head and valvetrain. Now will it last as long do to the forces applied? More than likely not, but I consider that a portion of the build quality.

 

[WES_393]

Thanks a lot for the replies, the only other thing I was wondering is if the 4G64 is as prone to crankwalk as the 4G63

I've personally never heard of a 4g64 walking. Not to say it's never happened, but it's not common to hear about.

The main difference between the 4g64 and the 4g63 is the crankshaft. The 4g63 crankshaft has an 88mm throw and 85mm pistons. The 4g64 (g4cs) uses a 100mm crank throw and 86.5mm pistons. Becuase of the extra stoke, you get more low end torque and higher displacement. This extra displacement will also help spool the turbo since more exhaust gas per rev is being fed to the turbo.

 

[Cornfed4G64]

Oops!

 

[FLASH1970]

The g4cs and 4g64 also have a higher deck. Meaning there is more space between the main journals and the top of the block. But there are no oil squirters.

The reason for the lower revs on a stroker is the piston is moving even faster with a stroker. It has to cover more distance in each revolution. Plus there is more pressure on the sides of the piston due to a more extreme rod angle especially at mid stroke.

I just picked up a complete G4CS engine today for a Crower rod/ "X" piston build...

"X" meaning I haven't decided which pistons to use.

 

[WES_393]

The reason for the lower revs on a stroker is the piston is moving even faster with a stroker. It has to cover more distance in each revolution.

That's why those Cosworth V8's can rev to 20k RPM. But they also have to rev that high to make power, so there is an acceptable trade off bewteen stroke and high rev.

 

[iTSaTSi]

The reason I'm asking this is because the Talon I'm buying has a 4G64 in it, its already pretty heavily modded, but I'm getting it for $3k so I can't really be picky. I just wasn't sure if having the 4G64 was a good thing or not. Do a lot of people use the same head?

 

[jamarh85]

Just some food for thought, je released asymmetrical pistons for stroker engines. This reduces the stress on the cylinder walls. I think this is a great alternative to switching out your bottom end. David buscur use to run the 4g64 bottom end with 4g63 crank in his evo, but swithced back to the 4g63 with 4g64 crank and asymmetrical piston combo. For what your paying for your talon i think thats not a bad deal at all. Hopefully i posted this link correctly but this is buschurs discussion and dyno results on it.
if u also search on the forum is a 2.3 better than 2.4 its a lot of great info. on that thread

Bad Bish, episode XXX, picture and new build thread - Page 16 - evolutionm.net

 

[WES_393]

4g64 is a great street engine because of the low end torque and quick spool times. It's much more "streetable" than the 2.0 IMO. The 4g63 turbo head can bolt on to the 4g64 with a few minor mods. I would make sure it really has a 4g64, it doesn't affect the price much but it would be nice to know if it's really there. It also requires a different timing belt and some other odds and ends so that's another reason it would be good to know if it's really there.

 

[iTSaTSi]

4g64 is a great street engine because of the low end torque and quick spool times. It's much more "streetable" than the 2.0 IMO. The 4g63 turbo head can bolt on to the 4g64 with a few minor mods. I would make sure it really has a 4g64, it doesn't affect the price much but it would be nice to know if it's really there. It also requires a different timing belt and some other odds and ends so that's another reason it would be good to know if it's really there.

Thanks for the info on the head but I'm certain thats what I'm getting. The person thats selling it to me is a really good friend that I met when we were in tech school together. He actually built it for a class project, but thanks for looking out

 

[ed1380]

Its not a stroker if its the stock stroke

With a 2.4 you'll have torque that's more likely to break tranny parts.
With a 2.0 you'll need a well built tranny to shift smoothly at higher rpm.

I'd go with a 4g64 as parts for it are dime a dozen.