How high do you think it's safe to turn a G4CS? I'm looking at 8.5:1 JE's, eagle rods, ARP studs throughout the bottom end, and having the motor balanced. Gonna run a big turbo like an SC61 or maybe even a GT4067, so I wanna decide what A/R housing to run. Do you think a .81 A/R housing would be too much? I know a GT4067 .81 A/R will make 14 pounds of boost by about 6000 on a 1.9 litre honda, so I figure it'll be in the 4500-5000 range on a 2.4?
It all depends on how much boost you want to run, the higher the compression ratio the less boost you will be able to (safely) run. There are tradeoffs for each one, and benefits as well. With higher compression you have a higher chance of knock (knock= http://www.jandssafeguard.com/tech.html ), forcing you to use higher octane fuel to prevent the increased chance of knock. But the higher compression will spool the turbo faster. Basically, you have to weigh out what you want more. I think 9.0:1 is the general acceptance of a compression limit. 8.0:1 or 8.5:1 is a good low compression ratio.
There are many arguments to use lower or higher compression ratios. The general consensus is that lower compression ratio's will be easier to tune/work with, but a higher compression ratio would yield the most effective results (yet would be harder to tune....tradeoffs).
Well I noticed Swordfish posted a link to Use our original 4g63 block with the g4cs crank.. This would make it a 2.3L if im correct and then all that would need to be done would be to bore out the block .40 over to get the 2.4L i think... Plus custom Dish pistons to lower the compression.... This way seems cheaper to me just to find a g4cs crank and buy some forged dish pistons to get the compression ratio at 8.7:1 or 9:1.... why isnt anybody going this route??? is there anything wrong besides the fact that you have to machine a bit of the block and bridges of the 4g63 for the rods to clear them????? Let me know becuase i was planning on going this route seeing that already have a g4cs crank and 2 extra 6bolt 4g63 short blocks laying around...
In order to get 2.3L out of the 4G63/2.4L combo, you need to bore the block .040". Otherwise you only have a 2.270cc motor. Boring it out .040" gives you 2378cc.
Id like to know how you figure a higher compression spools the turbo faster. Thats news to me. Sean
it doesnt. i think where this comes from is the car feels stronger off boost and leading up to full boost because of the higher compression. note to 2.4 turbo, i dropped my block and rods and pistons off at the machine shop yesterday. i should have it back within a month. all i have to buy is a new oil pump case, cams, and the sprockets and gaskets and im ready.
it doesnt. i think where this comes from is the car feels stronger off boost and leading up to full boost because of the higher compression. note to 2.4 turbo, i dropped my block and rods and pistons off at the machine shop yesterday. i should have it back within a month. all i have to buy is a new oil pump case, cams, and the sprockets and gaskets and im ready.
Are you documenting the buildup with a digital camera?? It helps to have the pictures handy when no one believes you have a 2.4 liter motor in there.
3) Head gasket selection worries me. Are there any metal head gasket options for the 2.4l block? Mitsu/Cometic/HKS???
4) 6 bolt 2.0l flyhweel/clutch will bolt up w/o any issues correct?
I did not put the oil squirters in my g4cs. I have the engine in the car but need to finish connecting everything before I can run it, and I don't anticipate any problems without the oil squirters. I used a Cometic metal head gasket with my buildup. Yes, they are available with the correct bore. The 6 bolt flywheel and clutch work fine, with no issues. Just be sure to remove the automatic transmission bushing from the end of your crankshaft, if you have one in there.
3) Head gasket selection worries me. Are there any metal head gasket options for the 2.4l block? Mitsu/Cometic/HKS???
4) 6 bolt 2.0l flyhweel/clutch will bolt up w/o any issues correct?
1. Ive never tried putting a 4g64 crank in the g4cs block. Why would you want a 7 bolt crank in that block anyways?
2. I dont run oil squirters on any of the hybrids I have built.
3. Dont waste your money on an "aftermarket" headgasket. The last thing you want if your detonating at all is your pistons and rods taking that abuse. Id take a failed headgasket anyday over tearing a motor apart for a complete rebuild due to failed rod bearings or a "punched" piston. Ive used the stock mitsu headgaskets and they work wonders, and yes they work just fine with the stock bore.
4. Not if you put that waste of time 4g64 7bolt crank in there it wont.
Remember K.I.S.S. Keep it simple stupid. The reason being is that sooner or later something will break its a given with these cars.
my 10 minutes browing sonata info leads me to believe that there was no other engine offering in these besides the v6.
am I mistaken in this?
reason I ask is if I'm going to go tomorrow and pull it I need to take a truck rather then my car :o
is it worth it to get the head and resell it?
shortblock is 100 and the longblock is 150
thx
well shit, i thought it was a 4 cylinder that i took to the machine shop :laugh: no they came with a 2.4 4 banger too. i would just get the shortblock and use the $50 towards some good pistons.
well shit, i thought it was a 4 cylinder that i took to the machine shop :laugh: no they came with a 2.4 4 banger too. i would just get the shortblock and use the $50 towards some good pistons.
pardon my horrible grammar. I meant there was the 2.4 4 and the v6 as the only options available
Im surprised at how quickly this thread I started just under a year ago has recently gained some popularity.
Forgive me for the pictures not being "intact" my server and hard drive went out a while back and I lost everything.
For any of you that are still stumped after reading this entire thread please feel free to message me.
I have built 5 of these motors all with forged internals and not one of them has let down yet.
For those of you that doubt my "strange" break in methods be advised not one of the motors I have built has ever had a compression reading below 180 psi. For those of you that baby the engine the first ten minutes or so on a first time fire up, well how can I say this, Good luck.
For those of you wanting that "sleeper" this is the ultimate package.
I have the g4cs block i'm just waiting for my pistons and rods to come in so i can get the machine work done and assemble the block. I took the crank to a machine shop and they said it looks like it needs to be turned. I was going to get it turned but decided to try another shop to get a second opinion. This shop polished it up for $30 and now it looks as if it's bran new.
Thanks to 2.4 turbo hybrid for starting this thread even though his pix don’t work anymore this thread has helped allot. I'll post up some pix of my build up when it's finished.
i have a 7bolt 4g63 in my 93 eclipse awd, am i going to have to buy anything extra for a g4cs, like a new flywheel or would it be better if i just stayed with 7bolt and got a 4g64? not sure how everything works when going from 7 bolt to 6 bolt so excuse the ignorance.
i have a 7bolt 4g63 in my 93 eclipse awd, am i going to have to buy anything extra for a g4cs, like a new flywheel or would it be better if i just stayed with 7bolt and got a 4g64? not sure how everything works when going from 7 bolt to 6 bolt so excuse the ignorance.
Get a 7-bolt 4G64. FWIW, just because it's a 4G64 doesn't mean it's a 7-bolt. Check it to make sure.
Im also going through with a 2.4 build (eventually). Im using a g4cs, probably wiseco/eagle/clevite along with a SCM61 (I know the owner of precision turbo , no shit!). Ill probably be doing some head porting, and maybe some 1mm oversize valves and cams.
The only problem is, my transmission has recently taken a crap on me, and I think it needs a rebuild very very soon. Ill probably be sending it to dogboxracing.com or TRE for a rebuild/upgrade.
What kind of load would a 2.4/61 setup put on the transmission? What kind of upgrades should I be looking to make to the transmission? Im thinking of getting the "Race Package" from DogBox ( http://dogboxracing.com/services.cfm ).
